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linuxdebug/drivers/gpu/drm/xlnx/zynqmp_dp.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* ZynqMP DisplayPort Driver
*
* Copyright (C) 2017 - 2020 Xilinx, Inc.
*
* Authors:
* - Hyun Woo Kwon <hyun.kwon@xilinx.com>
* - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#include <drm/display/drm_dp_helper.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_connector.h>
#include <drm/drm_crtc.h>
#include <drm/drm_device.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder.h>
#include <drm/drm_managed.h>
#include <drm/drm_modes.h>
#include <drm/drm_of.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/phy/phy.h>
#include <linux/reset.h>
#include "zynqmp_disp.h"
#include "zynqmp_dp.h"
#include "zynqmp_dpsub.h"
static uint zynqmp_dp_aux_timeout_ms = 50;
module_param_named(aux_timeout_ms, zynqmp_dp_aux_timeout_ms, uint, 0444);
MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)");
/*
* Some sink requires a delay after power on request
*/
static uint zynqmp_dp_power_on_delay_ms = 4;
module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444);
MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)");
/* Link configuration registers */
#define ZYNQMP_DP_LINK_BW_SET 0x0
#define ZYNQMP_DP_LANE_COUNT_SET 0x4
#define ZYNQMP_DP_ENHANCED_FRAME_EN 0x8
#define ZYNQMP_DP_TRAINING_PATTERN_SET 0xc
#define ZYNQMP_DP_SCRAMBLING_DISABLE 0x14
#define ZYNQMP_DP_DOWNSPREAD_CTL 0x18
#define ZYNQMP_DP_SOFTWARE_RESET 0x1c
#define ZYNQMP_DP_SOFTWARE_RESET_STREAM1 BIT(0)
#define ZYNQMP_DP_SOFTWARE_RESET_STREAM2 BIT(1)
#define ZYNQMP_DP_SOFTWARE_RESET_STREAM3 BIT(2)
#define ZYNQMP_DP_SOFTWARE_RESET_STREAM4 BIT(3)
#define ZYNQMP_DP_SOFTWARE_RESET_AUX BIT(7)
#define ZYNQMP_DP_SOFTWARE_RESET_ALL (ZYNQMP_DP_SOFTWARE_RESET_STREAM1 | \
ZYNQMP_DP_SOFTWARE_RESET_STREAM2 | \
ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \
ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \
ZYNQMP_DP_SOFTWARE_RESET_AUX)
/* Core enable registers */
#define ZYNQMP_DP_TRANSMITTER_ENABLE 0x80
#define ZYNQMP_DP_MAIN_STREAM_ENABLE 0x84
#define ZYNQMP_DP_FORCE_SCRAMBLER_RESET 0xc0
#define ZYNQMP_DP_VERSION 0xf8
#define ZYNQMP_DP_VERSION_MAJOR_MASK GENMASK(31, 24)
#define ZYNQMP_DP_VERSION_MAJOR_SHIFT 24
#define ZYNQMP_DP_VERSION_MINOR_MASK GENMASK(23, 16)
#define ZYNQMP_DP_VERSION_MINOR_SHIFT 16
#define ZYNQMP_DP_VERSION_REVISION_MASK GENMASK(15, 12)
#define ZYNQMP_DP_VERSION_REVISION_SHIFT 12
#define ZYNQMP_DP_VERSION_PATCH_MASK GENMASK(11, 8)
#define ZYNQMP_DP_VERSION_PATCH_SHIFT 8
#define ZYNQMP_DP_VERSION_INTERNAL_MASK GENMASK(7, 0)
#define ZYNQMP_DP_VERSION_INTERNAL_SHIFT 0
/* Core ID registers */
#define ZYNQMP_DP_CORE_ID 0xfc
#define ZYNQMP_DP_CORE_ID_MAJOR_MASK GENMASK(31, 24)
#define ZYNQMP_DP_CORE_ID_MAJOR_SHIFT 24
#define ZYNQMP_DP_CORE_ID_MINOR_MASK GENMASK(23, 16)
#define ZYNQMP_DP_CORE_ID_MINOR_SHIFT 16
#define ZYNQMP_DP_CORE_ID_REVISION_MASK GENMASK(15, 8)
#define ZYNQMP_DP_CORE_ID_REVISION_SHIFT 8
#define ZYNQMP_DP_CORE_ID_DIRECTION GENMASK(1)
/* AUX channel interface registers */
#define ZYNQMP_DP_AUX_COMMAND 0x100
#define ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT 8
#define ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY BIT(12)
#define ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT 0
#define ZYNQMP_DP_AUX_WRITE_FIFO 0x104
#define ZYNQMP_DP_AUX_ADDRESS 0x108
#define ZYNQMP_DP_AUX_CLK_DIVIDER 0x10c
#define ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT 8
#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE 0x130
#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD BIT(0)
#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST BIT(1)
#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY BIT(2)
#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT BIT(3)
#define ZYNQMP_DP_AUX_REPLY_DATA 0x134
#define ZYNQMP_DP_AUX_REPLY_CODE 0x138
#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK (0)
#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_NACK BIT(0)
#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_DEFER BIT(1)
#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK (0)
#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_NACK BIT(2)
#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_DEFER BIT(3)
#define ZYNQMP_DP_AUX_REPLY_COUNT 0x13c
#define ZYNQMP_DP_REPLY_DATA_COUNT 0x148
#define ZYNQMP_DP_REPLY_DATA_COUNT_MASK 0xff
#define ZYNQMP_DP_INT_STATUS 0x3a0
#define ZYNQMP_DP_INT_MASK 0x3a4
#define ZYNQMP_DP_INT_EN 0x3a8
#define ZYNQMP_DP_INT_DS 0x3ac
#define ZYNQMP_DP_INT_HPD_IRQ BIT(0)
#define ZYNQMP_DP_INT_HPD_EVENT BIT(1)
#define ZYNQMP_DP_INT_REPLY_RECEIVED BIT(2)
#define ZYNQMP_DP_INT_REPLY_TIMEOUT BIT(3)
#define ZYNQMP_DP_INT_HPD_PULSE_DET BIT(4)
#define ZYNQMP_DP_INT_EXT_PKT_TXD BIT(5)
#define ZYNQMP_DP_INT_LIV_ABUF_UNDRFLW BIT(12)
#define ZYNQMP_DP_INT_VBLANK_START BIT(13)
#define ZYNQMP_DP_INT_PIXEL1_MATCH BIT(14)
#define ZYNQMP_DP_INT_PIXEL0_MATCH BIT(15)
#define ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK 0x3f0000
#define ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK 0xfc00000
#define ZYNQMP_DP_INT_CUST_TS_2 BIT(28)
#define ZYNQMP_DP_INT_CUST_TS BIT(29)
#define ZYNQMP_DP_INT_EXT_VSYNC_TS BIT(30)
#define ZYNQMP_DP_INT_VSYNC_TS BIT(31)
#define ZYNQMP_DP_INT_ALL (ZYNQMP_DP_INT_HPD_IRQ | \
ZYNQMP_DP_INT_HPD_EVENT | \
ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK | \
ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
/* Main stream attribute registers */
#define ZYNQMP_DP_MAIN_STREAM_HTOTAL 0x180
#define ZYNQMP_DP_MAIN_STREAM_VTOTAL 0x184
#define ZYNQMP_DP_MAIN_STREAM_POLARITY 0x188
#define ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT 0
#define ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT 1
#define ZYNQMP_DP_MAIN_STREAM_HSWIDTH 0x18c
#define ZYNQMP_DP_MAIN_STREAM_VSWIDTH 0x190
#define ZYNQMP_DP_MAIN_STREAM_HRES 0x194
#define ZYNQMP_DP_MAIN_STREAM_VRES 0x198
#define ZYNQMP_DP_MAIN_STREAM_HSTART 0x19c
#define ZYNQMP_DP_MAIN_STREAM_VSTART 0x1a0
#define ZYNQMP_DP_MAIN_STREAM_MISC0 0x1a4
#define ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK BIT(0)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB (0 << 1)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422 (5 << 1)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444 (6 << 1)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK (7 << 1)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_DYNAMIC_RANGE BIT(3)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_YCBCR_COLR BIT(4)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6 (0 << 5)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8 (1 << 5)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10 (2 << 5)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12 (3 << 5)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16 (4 << 5)
#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK (7 << 5)
#define ZYNQMP_DP_MAIN_STREAM_MISC1 0x1a8
#define ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN BIT(7)
#define ZYNQMP_DP_MAIN_STREAM_M_VID 0x1ac
#define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE 0x1b0
#define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF 64
#define ZYNQMP_DP_MAIN_STREAM_N_VID 0x1b4
#define ZYNQMP_DP_USER_PIX_WIDTH 0x1b8
#define ZYNQMP_DP_USER_DATA_COUNT_PER_LANE 0x1bc
#define ZYNQMP_DP_MIN_BYTES_PER_TU 0x1c4
#define ZYNQMP_DP_FRAC_BYTES_PER_TU 0x1c8
#define ZYNQMP_DP_INIT_WAIT 0x1cc
/* PHY configuration and status registers */
#define ZYNQMP_DP_PHY_RESET 0x200
#define ZYNQMP_DP_PHY_RESET_PHY_RESET BIT(0)
#define ZYNQMP_DP_PHY_RESET_GTTX_RESET BIT(1)
#define ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET BIT(8)
#define ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET BIT(9)
#define ZYNQMP_DP_PHY_RESET_ALL_RESET (ZYNQMP_DP_PHY_RESET_PHY_RESET | \
ZYNQMP_DP_PHY_RESET_GTTX_RESET | \
ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET | \
ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET)
#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_0 0x210
#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_1 0x214
#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_2 0x218
#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_3 0x21c
#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_0 0x220
#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_1 0x224
#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_2 0x228
#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_3 0x22c
#define ZYNQMP_DP_PHY_CLOCK_SELECT 0x234
#define ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G 0x1
#define ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G 0x3
#define ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G 0x5
#define ZYNQMP_DP_TX_PHY_POWER_DOWN 0x238
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_0 BIT(0)
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_1 BIT(1)
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2 BIT(2)
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3 BIT(3)
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL 0xf
#define ZYNQMP_DP_PHY_PRECURSOR_LANE_0 0x23c
#define ZYNQMP_DP_PHY_PRECURSOR_LANE_1 0x240
#define ZYNQMP_DP_PHY_PRECURSOR_LANE_2 0x244
#define ZYNQMP_DP_PHY_PRECURSOR_LANE_3 0x248
#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_0 0x24c
#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_1 0x250
#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_2 0x254
#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_3 0x258
#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 0x24c
#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_1 0x250
#define ZYNQMP_DP_PHY_STATUS 0x280
#define ZYNQMP_DP_PHY_STATUS_PLL_LOCKED_SHIFT 4
#define ZYNQMP_DP_PHY_STATUS_FPGA_PLL_LOCKED BIT(6)
/* Audio registers */
#define ZYNQMP_DP_TX_AUDIO_CONTROL 0x300
#define ZYNQMP_DP_TX_AUDIO_CHANNELS 0x304
#define ZYNQMP_DP_TX_AUDIO_INFO_DATA 0x308
#define ZYNQMP_DP_TX_M_AUD 0x328
#define ZYNQMP_DP_TX_N_AUD 0x32c
#define ZYNQMP_DP_TX_AUDIO_EXT_DATA 0x330
#define ZYNQMP_DP_MAX_LANES 2
#define ZYNQMP_MAX_FREQ 3000000
#define DP_REDUCED_BIT_RATE 162000
#define DP_HIGH_BIT_RATE 270000
#define DP_HIGH_BIT_RATE2 540000
#define DP_MAX_TRAINING_TRIES 5
#define DP_V1_2 0x12
/**
* struct zynqmp_dp_link_config - Common link config between source and sink
* @max_rate: maximum link rate
* @max_lanes: maximum number of lanes
*/
struct zynqmp_dp_link_config {
int max_rate;
u8 max_lanes;
};
/**
* struct zynqmp_dp_mode - Configured mode of DisplayPort
* @bw_code: code for bandwidth(link rate)
* @lane_cnt: number of lanes
* @pclock: pixel clock frequency of current mode
* @fmt: format identifier string
*/
struct zynqmp_dp_mode {
u8 bw_code;
u8 lane_cnt;
int pclock;
const char *fmt;
};
/**
* struct zynqmp_dp_config - Configuration of DisplayPort from DTS
* @misc0: misc0 configuration (per DP v1.2 spec)
* @misc1: misc1 configuration (per DP v1.2 spec)
* @bpp: bits per pixel
*/
struct zynqmp_dp_config {
u8 misc0;
u8 misc1;
u8 bpp;
};
/**
* struct zynqmp_dp - Xilinx DisplayPort core
* @encoder: the drm encoder structure
* @connector: the drm connector structure
* @dev: device structure
* @dpsub: Display subsystem
* @drm: DRM core
* @iomem: device I/O memory for register access
* @reset: reset controller
* @irq: irq
* @config: IP core configuration from DTS
* @aux: aux channel
* @phy: PHY handles for DP lanes
* @num_lanes: number of enabled phy lanes
* @hpd_work: hot plug detection worker
* @status: connection status
* @enabled: flag to indicate if the device is enabled
* @dpcd: DP configuration data from currently connected sink device
* @link_config: common link configuration between IP core and sink device
* @mode: current mode between IP core and sink device
* @train_set: set of training data
*/
struct zynqmp_dp {
struct drm_encoder encoder;
struct drm_connector connector;
struct device *dev;
struct zynqmp_dpsub *dpsub;
struct drm_device *drm;
void __iomem *iomem;
struct reset_control *reset;
int irq;
struct zynqmp_dp_config config;
struct drm_dp_aux aux;
struct phy *phy[ZYNQMP_DP_MAX_LANES];
u8 num_lanes;
struct delayed_work hpd_work;
enum drm_connector_status status;
bool enabled;
u8 dpcd[DP_RECEIVER_CAP_SIZE];
struct zynqmp_dp_link_config link_config;
struct zynqmp_dp_mode mode;
u8 train_set[ZYNQMP_DP_MAX_LANES];
};
static inline struct zynqmp_dp *encoder_to_dp(struct drm_encoder *encoder)
{
return container_of(encoder, struct zynqmp_dp, encoder);
}
static inline struct zynqmp_dp *connector_to_dp(struct drm_connector *connector)
{
return container_of(connector, struct zynqmp_dp, connector);
}
static void zynqmp_dp_write(struct zynqmp_dp *dp, int offset, u32 val)
{
writel(val, dp->iomem + offset);
}
static u32 zynqmp_dp_read(struct zynqmp_dp *dp, int offset)
{
return readl(dp->iomem + offset);
}
static void zynqmp_dp_clr(struct zynqmp_dp *dp, int offset, u32 clr)
{
zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) & ~clr);
}
static void zynqmp_dp_set(struct zynqmp_dp *dp, int offset, u32 set)
{
zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) | set);
}
/* -----------------------------------------------------------------------------
* PHY Handling
*/
#define RST_TIMEOUT_MS 1000
static int zynqmp_dp_reset(struct zynqmp_dp *dp, bool assert)
{
unsigned long timeout;
if (assert)
reset_control_assert(dp->reset);
else
reset_control_deassert(dp->reset);
/* Wait for the (de)assert to complete. */
timeout = jiffies + msecs_to_jiffies(RST_TIMEOUT_MS);
while (!time_after_eq(jiffies, timeout)) {
bool status = !!reset_control_status(dp->reset);
if (assert == status)
return 0;
cpu_relax();
}
dev_err(dp->dev, "reset %s timeout\n", assert ? "assert" : "deassert");
return -ETIMEDOUT;
}
/**
* zynqmp_dp_phy_init - Initialize the phy
* @dp: DisplayPort IP core structure
*
* Initialize the phy.
*
* Return: 0 if the phy instances are initialized correctly, or the error code
* returned from the callee functions.
*/
static int zynqmp_dp_phy_init(struct zynqmp_dp *dp)
{
int ret;
int i;
for (i = 0; i < dp->num_lanes; i++) {
ret = phy_init(dp->phy[i]);
if (ret) {
dev_err(dp->dev, "failed to init phy lane %d\n", i);
return ret;
}
}
zynqmp_dp_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
/*
* Power on lanes in reverse order as only lane 0 waits for the PLL to
* lock.
*/
for (i = dp->num_lanes - 1; i >= 0; i--) {
ret = phy_power_on(dp->phy[i]);
if (ret) {
dev_err(dp->dev, "failed to power on phy lane %d\n", i);
return ret;
}
}
return 0;
}
/**
* zynqmp_dp_phy_exit - Exit the phy
* @dp: DisplayPort IP core structure
*
* Exit the phy.
*/
static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp)
{
unsigned int i;
int ret;
for (i = 0; i < dp->num_lanes; i++) {
ret = phy_power_off(dp->phy[i]);
if (ret)
dev_err(dp->dev, "failed to power off phy(%d) %d\n", i,
ret);
}
for (i = 0; i < dp->num_lanes; i++) {
ret = phy_exit(dp->phy[i]);
if (ret)
dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret);
}
}
/**
* zynqmp_dp_phy_probe - Probe the PHYs
* @dp: DisplayPort IP core structure
*
* Probe PHYs for all lanes. Less PHYs may be available than the number of
* lanes, which is not considered an error as long as at least one PHY is
* found. The caller can check dp->num_lanes to check how many PHYs were found.
*
* Return:
* * 0 - Success
* * -ENXIO - No PHY found
* * -EPROBE_DEFER - Probe deferral requested
* * Other negative value - PHY retrieval failure
*/
static int zynqmp_dp_phy_probe(struct zynqmp_dp *dp)
{
unsigned int i;
for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) {
char phy_name[16];
struct phy *phy;
snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i);
phy = devm_phy_get(dp->dev, phy_name);
if (IS_ERR(phy)) {
switch (PTR_ERR(phy)) {
case -ENODEV:
if (dp->num_lanes)
return 0;
dev_err(dp->dev, "no PHY found\n");
return -ENXIO;
case -EPROBE_DEFER:
return -EPROBE_DEFER;
default:
dev_err(dp->dev, "failed to get PHY lane %u\n",
i);
return PTR_ERR(phy);
}
}
dp->phy[i] = phy;
dp->num_lanes++;
}
return 0;
}
/**
* zynqmp_dp_phy_ready - Check if PHY is ready
* @dp: DisplayPort IP core structure
*
* Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times.
* This amount of delay was suggested by IP designer.
*
* Return: 0 if PHY is ready, or -ENODEV if PHY is not ready.
*/
static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp)
{
u32 i, reg, ready;
ready = (1 << dp->num_lanes) - 1;
/* Wait for 100 * 1ms. This should be enough time for PHY to be ready */
for (i = 0; ; i++) {
reg = zynqmp_dp_read(dp, ZYNQMP_DP_PHY_STATUS);
if ((reg & ready) == ready)
return 0;
if (i == 100) {
dev_err(dp->dev, "PHY isn't ready\n");
return -ENODEV;
}
usleep_range(1000, 1100);
}
return 0;
}
/* -----------------------------------------------------------------------------
* DisplayPort Link Training
*/
/**
* zynqmp_dp_max_rate - Calculate and return available max pixel clock
* @link_rate: link rate (Kilo-bytes / sec)
* @lane_num: number of lanes
* @bpp: bits per pixel
*
* Return: max pixel clock (KHz) supported by current link config.
*/
static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp)
{
return link_rate * lane_num * 8 / bpp;
}
/**
* zynqmp_dp_mode_configure - Configure the link values
* @dp: DisplayPort IP core structure
* @pclock: pixel clock for requested display mode
* @current_bw: current link rate
*
* Find the link configuration values, rate and lane count for requested pixel
* clock @pclock. The @pclock is stored in the mode to be used in other
* functions later. The returned rate is downshifted from the current rate
* @current_bw.
*
* Return: Current link rate code, or -EINVAL.
*/
static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock,
u8 current_bw)
{
int max_rate = dp->link_config.max_rate;
u8 bw_code;
u8 max_lanes = dp->link_config.max_lanes;
u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate);
u8 bpp = dp->config.bpp;
u8 lane_cnt;
/* Downshift from current bandwidth */
switch (current_bw) {
case DP_LINK_BW_5_4:
bw_code = DP_LINK_BW_2_7;
break;
case DP_LINK_BW_2_7:
bw_code = DP_LINK_BW_1_62;
break;
case DP_LINK_BW_1_62:
dev_err(dp->dev, "can't downshift. already lowest link rate\n");
return -EINVAL;
default:
/* If not given, start with max supported */
bw_code = max_link_rate_code;
break;
}
for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) {
int bw;
u32 rate;
bw = drm_dp_bw_code_to_link_rate(bw_code);
rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp);
if (pclock <= rate) {
dp->mode.bw_code = bw_code;
dp->mode.lane_cnt = lane_cnt;
dp->mode.pclock = pclock;
return dp->mode.bw_code;
}
}
dev_err(dp->dev, "failed to configure link values\n");
return -EINVAL;
}
/**
* zynqmp_dp_adjust_train - Adjust train values
* @dp: DisplayPort IP core structure
* @link_status: link status from sink which contains requested training values
*/
static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp,
u8 link_status[DP_LINK_STATUS_SIZE])
{
u8 *train_set = dp->train_set;
u8 voltage = 0, preemphasis = 0;
u8 i;
for (i = 0; i < dp->mode.lane_cnt; i++) {
u8 v = drm_dp_get_adjust_request_voltage(link_status, i);
u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
if (v > voltage)
voltage = v;
if (p > preemphasis)
preemphasis = p;
}
if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
voltage |= DP_TRAIN_MAX_SWING_REACHED;
if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2)
preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
for (i = 0; i < dp->mode.lane_cnt; i++)
train_set[i] = voltage | preemphasis;
}
/**
* zynqmp_dp_update_vs_emph - Update the training values
* @dp: DisplayPort IP core structure
*
* Update the training values based on the request from sink. The mapped values
* are predefined, and values(vs, pe, pc) are from the device manual.
*
* Return: 0 if vs and emph are updated successfully, or the error code returned
* by drm_dp_dpcd_write().
*/
static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp)
{
unsigned int i;
int ret;
ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->train_set,
dp->mode.lane_cnt);
if (ret < 0)
return ret;
for (i = 0; i < dp->mode.lane_cnt; i++) {
u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4;
union phy_configure_opts opts = { 0 };
u8 train = dp->train_set[i];
opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK)
>> DP_TRAIN_VOLTAGE_SWING_SHIFT;
opts.dp.pre[0] = (train & DP_TRAIN_PRE_EMPHASIS_MASK)
>> DP_TRAIN_PRE_EMPHASIS_SHIFT;
phy_configure(dp->phy[i], &opts);
zynqmp_dp_write(dp, reg, 0x2);
}
return 0;
}
/**
* zynqmp_dp_link_train_cr - Train clock recovery
* @dp: DisplayPort IP core structure
*
* Return: 0 if clock recovery train is done successfully, or corresponding
* error code.
*/
static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp)
{
u8 link_status[DP_LINK_STATUS_SIZE];
u8 lane_cnt = dp->mode.lane_cnt;
u8 vs = 0, tries = 0;
u16 max_tries, i;
bool cr_done;
int ret;
zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
DP_TRAINING_PATTERN_1);
ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
DP_TRAINING_PATTERN_1 |
DP_LINK_SCRAMBLING_DISABLE);
if (ret < 0)
return ret;
/*
* 256 loops should be maximum iterations for 4 lanes and 4 values.
* So, This loop should exit before 512 iterations
*/
for (max_tries = 0; max_tries < 512; max_tries++) {
ret = zynqmp_dp_update_vs_emph(dp);
if (ret)
return ret;
drm_dp_link_train_clock_recovery_delay(&dp->aux, dp->dpcd);
ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
if (ret < 0)
return ret;
cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt);
if (cr_done)
break;
for (i = 0; i < lane_cnt; i++)
if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED))
break;
if (i == lane_cnt)
break;
if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs)
tries++;
else
tries = 0;
if (tries == DP_MAX_TRAINING_TRIES)
break;
vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
zynqmp_dp_adjust_train(dp, link_status);
}
if (!cr_done)
return -EIO;
return 0;
}
/**
* zynqmp_dp_link_train_ce - Train channel equalization
* @dp: DisplayPort IP core structure
*
* Return: 0 if channel equalization train is done successfully, or
* corresponding error code.
*/
static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp)
{
u8 link_status[DP_LINK_STATUS_SIZE];
u8 lane_cnt = dp->mode.lane_cnt;
u32 pat, tries;
int ret;
bool ce_done;
if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 &&
dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED)
pat = DP_TRAINING_PATTERN_3;
else
pat = DP_TRAINING_PATTERN_2;
zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, pat);
ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
pat | DP_LINK_SCRAMBLING_DISABLE);
if (ret < 0)
return ret;
for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) {
ret = zynqmp_dp_update_vs_emph(dp);
if (ret)
return ret;
drm_dp_link_train_channel_eq_delay(&dp->aux, dp->dpcd);
ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
if (ret < 0)
return ret;
ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt);
if (ce_done)
break;
zynqmp_dp_adjust_train(dp, link_status);
}
if (!ce_done)
return -EIO;
return 0;
}
/**
* zynqmp_dp_link_train - Train the link
* @dp: DisplayPort IP core structure
*
* Return: 0 if all trains are done successfully, or corresponding error code.
*/
static int zynqmp_dp_train(struct zynqmp_dp *dp)
{
u32 reg;
u8 bw_code = dp->mode.bw_code;
u8 lane_cnt = dp->mode.lane_cnt;
u8 aux_lane_cnt = lane_cnt;
bool enhanced;
int ret;
zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt);
enhanced = drm_dp_enhanced_frame_cap(dp->dpcd);
if (enhanced) {
zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1);
aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
}
if (dp->dpcd[3] & 0x1) {
zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1);
drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL,
DP_SPREAD_AMP_0_5);
} else {
zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 0);
drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0);
}
ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt);
if (ret < 0) {
dev_err(dp->dev, "failed to set lane count\n");
return ret;
}
ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
DP_SET_ANSI_8B10B);
if (ret < 0) {
dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n");
return ret;
}
ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code);
if (ret < 0) {
dev_err(dp->dev, "failed to set DP bandwidth\n");
return ret;
}
zynqmp_dp_write(dp, ZYNQMP_DP_LINK_BW_SET, bw_code);
switch (bw_code) {
case DP_LINK_BW_1_62:
reg = ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G;
break;
case DP_LINK_BW_2_7:
reg = ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G;
break;
case DP_LINK_BW_5_4:
default:
reg = ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G;
break;
}
zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg);
ret = zynqmp_dp_phy_ready(dp);
if (ret < 0)
return ret;
zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1);
memset(dp->train_set, 0, sizeof(dp->train_set));
ret = zynqmp_dp_link_train_cr(dp);
if (ret)
return ret;
ret = zynqmp_dp_link_train_ce(dp);
if (ret)
return ret;
ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
DP_TRAINING_PATTERN_DISABLE);
if (ret < 0) {
dev_err(dp->dev, "failed to disable training pattern\n");
return ret;
}
zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
DP_TRAINING_PATTERN_DISABLE);
zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 0);
return 0;
}
/**
* zynqmp_dp_train_loop - Downshift the link rate during training
* @dp: DisplayPort IP core structure
*
* Train the link by downshifting the link rate if training is not successful.
*/
static void zynqmp_dp_train_loop(struct zynqmp_dp *dp)
{
struct zynqmp_dp_mode *mode = &dp->mode;
u8 bw = mode->bw_code;
int ret;
do {
if (dp->status == connector_status_disconnected ||
!dp->enabled)
return;
ret = zynqmp_dp_train(dp);
if (!ret)
return;
ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw);
if (ret < 0)
goto err_out;
bw = ret;
} while (bw >= DP_LINK_BW_1_62);
err_out:
dev_err(dp->dev, "failed to train the DP link\n");
}
/* -----------------------------------------------------------------------------
* DisplayPort AUX
*/
#define AUX_READ_BIT 0x1
/**
* zynqmp_dp_aux_cmd_submit - Submit aux command
* @dp: DisplayPort IP core structure
* @cmd: aux command
* @addr: aux address
* @buf: buffer for command data
* @bytes: number of bytes for @buf
* @reply: reply code to be returned
*
* Submit an aux command. All aux related commands, native or i2c aux
* read/write, are submitted through this function. The function is mapped to
* the transfer function of struct drm_dp_aux. This function involves in
* multiple register reads/writes, thus synchronization is needed, and it is
* done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep
* if there's no immediate reply to the command submission. The reply code is
* returned at @reply if @reply != NULL.
*
* Return: 0 if the command is submitted properly, or corresponding error code:
* -EBUSY when there is any request already being processed
* -ETIMEDOUT when receiving reply is timed out
* -EIO when received bytes are less than requested
*/
static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
u8 *buf, u8 bytes, u8 *reply)
{
bool is_read = (cmd & AUX_READ_BIT) ? true : false;
u32 reg, i;
reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST)
return -EBUSY;
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr);
if (!is_read)
for (i = 0; i < bytes; i++)
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_WRITE_FIFO,
buf[i]);
reg = cmd << ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT;
if (!buf || !bytes)
reg |= ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY;
else
reg |= (bytes - 1) << ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT;
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg);
/* Wait for reply to be delivered upto 2ms */
for (i = 0; ; i++) {
reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY)
break;
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT ||
i == 2)
return -ETIMEDOUT;
usleep_range(1000, 1100);
}
reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE);
if (reply)
*reply = reg;
if (is_read &&
(reg == ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK ||
reg == ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK)) {
reg = zynqmp_dp_read(dp, ZYNQMP_DP_REPLY_DATA_COUNT);
if ((reg & ZYNQMP_DP_REPLY_DATA_COUNT_MASK) != bytes)
return -EIO;
for (i = 0; i < bytes; i++)
buf[i] = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_DATA);
}
return 0;
}
static ssize_t
zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
{
struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux);
int ret;
unsigned int i, iter;
/* Number of loops = timeout in msec / aux delay (400 usec) */
iter = zynqmp_dp_aux_timeout_ms * 1000 / 400;
iter = iter ? iter : 1;
for (i = 0; i < iter; i++) {
ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address,
msg->buffer, msg->size,
&msg->reply);
if (!ret) {
dev_dbg(dp->dev, "aux %d retries\n", i);
return msg->size;
}
if (dp->status == connector_status_disconnected) {
dev_dbg(dp->dev, "no connected aux device\n");
return -ENODEV;
}
usleep_range(400, 500);
}
dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret);
return ret;
}
/**
* zynqmp_dp_aux_init - Initialize and register the DP AUX
* @dp: DisplayPort IP core structure
*
* Program the AUX clock divider and filter and register the DP AUX adapter.
*
* Return: 0 on success, error value otherwise
*/
static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
{
unsigned long rate;
unsigned int w;
/*
* The AUX_SIGNAL_WIDTH_FILTER is the number of APB clock cycles
* corresponding to the AUX pulse. Allowable values are 8, 16, 24, 32,
* 40 and 48. The AUX pulse width must be between 0.4µs and 0.6µs,
* compute the w / 8 value corresponding to 0.4µs rounded up, and make
* sure it stays below 0.6µs and within the allowable values.
*/
rate = clk_get_rate(dp->dpsub->apb_clk);
w = DIV_ROUND_UP(4 * rate, 1000 * 1000 * 10 * 8) * 8;
if (w > 6 * rate / (1000 * 1000 * 10) || w > 48) {
dev_err(dp->dev, "aclk frequency too high\n");
return -EINVAL;
}
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_CLK_DIVIDER,
(w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) |
(rate / (1000 * 1000)));
dp->aux.name = "ZynqMP DP AUX";
dp->aux.dev = dp->dev;
dp->aux.drm_dev = dp->drm;
dp->aux.transfer = zynqmp_dp_aux_transfer;
return drm_dp_aux_register(&dp->aux);
}
/**
* zynqmp_dp_aux_cleanup - Cleanup the DP AUX
* @dp: DisplayPort IP core structure
*
* Unregister the DP AUX adapter.
*/
static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp)
{
drm_dp_aux_unregister(&dp->aux);
}
/* -----------------------------------------------------------------------------
* DisplayPort Generic Support
*/
/**
* zynqmp_dp_update_misc - Write the misc registers
* @dp: DisplayPort IP core structure
*
* The misc register values are stored in the structure, and this
* function applies the values into the registers.
*/
static void zynqmp_dp_update_misc(struct zynqmp_dp *dp)
{
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC0, dp->config.misc0);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC1, dp->config.misc1);
}
/**
* zynqmp_dp_set_format - Set the input format
* @dp: DisplayPort IP core structure
* @format: input format
* @bpc: bits per component
*
* Update misc register values based on input @format and @bpc.
*
* Return: 0 on success, or -EINVAL.
*/
static int zynqmp_dp_set_format(struct zynqmp_dp *dp,
enum zynqmp_dpsub_format format,
unsigned int bpc)
{
static const struct drm_display_info *display;
struct zynqmp_dp_config *config = &dp->config;
unsigned int num_colors;
config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK;
config->misc1 &= ~ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
switch (format) {
case ZYNQMP_DPSUB_FORMAT_RGB:
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB;
num_colors = 3;
break;
case ZYNQMP_DPSUB_FORMAT_YCRCB444:
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444;
num_colors = 3;
break;
case ZYNQMP_DPSUB_FORMAT_YCRCB422:
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422;
num_colors = 2;
break;
case ZYNQMP_DPSUB_FORMAT_YONLY:
config->misc1 |= ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
num_colors = 1;
break;
default:
dev_err(dp->dev, "Invalid colormetry in DT\n");
return -EINVAL;
}
display = &dp->connector.display_info;
if (display->bpc && bpc > display->bpc) {
dev_warn(dp->dev,
"downgrading requested %ubpc to display limit %ubpc\n",
bpc, display->bpc);
bpc = display->bpc;
}
config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK;
switch (bpc) {
case 6:
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6;
break;
case 8:
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
break;
case 10:
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10;
break;
case 12:
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12;
break;
case 16:
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16;
break;
default:
dev_warn(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n",
bpc);
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
bpc = 8;
break;
}
/* Update the current bpp based on the format. */
config->bpp = bpc * num_colors;
return 0;
}
/**
* zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values
* @dp: DisplayPort IP core structure
* @mode: requested display mode
*
* Set the transfer unit, and calculate all transfer unit size related values.
* Calculation is based on DP and IP core specification.
*/
static void
zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp,
struct drm_display_mode *mode)
{
u32 tu = ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF;
u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait;
/* Use the max transfer unit size (default) */
zynqmp_dp_write(dp, ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE, tu);
vid_kbytes = mode->clock * (dp->config.bpp / 8);
bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000);
zynqmp_dp_write(dp, ZYNQMP_DP_MIN_BYTES_PER_TU,
avg_bytes_per_tu / 1000);
zynqmp_dp_write(dp, ZYNQMP_DP_FRAC_BYTES_PER_TU,
avg_bytes_per_tu % 1000);
/* Configure the initial wait cycle based on transfer unit size */
if (tu < (avg_bytes_per_tu / 1000))
init_wait = 0;
else if ((avg_bytes_per_tu / 1000) <= 4)
init_wait = tu;
else
init_wait = tu - avg_bytes_per_tu / 1000;
zynqmp_dp_write(dp, ZYNQMP_DP_INIT_WAIT, init_wait);
}
/**
* zynqmp_dp_encoder_mode_set_stream - Configure the main stream
* @dp: DisplayPort IP core structure
* @mode: requested display mode
*
* Configure the main stream based on the requested mode @mode. Calculation is
* based on IP core specification.
*/
static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp,
const struct drm_display_mode *mode)
{
u8 lane_cnt = dp->mode.lane_cnt;
u32 reg, wpl;
unsigned int rate;
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HTOTAL, mode->htotal);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VTOTAL, mode->vtotal);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_POLARITY,
(!!(mode->flags & DRM_MODE_FLAG_PVSYNC) <<
ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT) |
(!!(mode->flags & DRM_MODE_FLAG_PHSYNC) <<
ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT));
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSWIDTH,
mode->hsync_end - mode->hsync_start);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSWIDTH,
mode->vsync_end - mode->vsync_start);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HRES, mode->hdisplay);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VRES, mode->vdisplay);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSTART,
mode->htotal - mode->hsync_start);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSTART,
mode->vtotal - mode->vsync_start);
/* In synchronous mode, set the diviers */
if (dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK) {
reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_N_VID, reg);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_M_VID, mode->clock);
rate = zynqmp_disp_get_audio_clk_rate(dp->dpsub->disp);
if (rate) {
dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512);
zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, reg);
zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000);
}
}
/* Only 2 channel audio is supported now */
if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1);
zynqmp_dp_write(dp, ZYNQMP_DP_USER_PIX_WIDTH, 1);
/* Translate to the native 16 bit datapath based on IP core spec */
wpl = (mode->hdisplay * dp->config.bpp + 15) / 16;
reg = wpl + wpl % lane_cnt - lane_cnt;
zynqmp_dp_write(dp, ZYNQMP_DP_USER_DATA_COUNT_PER_LANE, reg);
}
/* -----------------------------------------------------------------------------
* DRM Connector
*/
static enum drm_connector_status
zynqmp_dp_connector_detect(struct drm_connector *connector, bool force)
{
struct zynqmp_dp *dp = connector_to_dp(connector);
struct zynqmp_dp_link_config *link_config = &dp->link_config;
u32 state, i;
int ret;
/*
* This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to
* get the HPD signal with some monitors.
*/
for (i = 0; i < 10; i++) {
state = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD)
break;
msleep(100);
}
if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) {
ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd,
sizeof(dp->dpcd));
if (ret < 0) {
dev_dbg(dp->dev, "DPCD read failed");
goto disconnected;
}
link_config->max_rate = min_t(int,
drm_dp_max_link_rate(dp->dpcd),
DP_HIGH_BIT_RATE2);
link_config->max_lanes = min_t(u8,
drm_dp_max_lane_count(dp->dpcd),
dp->num_lanes);
dp->status = connector_status_connected;
return connector_status_connected;
}
disconnected:
dp->status = connector_status_disconnected;
return connector_status_disconnected;
}
static int zynqmp_dp_connector_get_modes(struct drm_connector *connector)
{
struct zynqmp_dp *dp = connector_to_dp(connector);
struct edid *edid;
int ret;
edid = drm_get_edid(connector, &dp->aux.ddc);
if (!edid)
return 0;
drm_connector_update_edid_property(connector, edid);
ret = drm_add_edid_modes(connector, edid);
kfree(edid);
return ret;
}
static struct drm_encoder *
zynqmp_dp_connector_best_encoder(struct drm_connector *connector)
{
struct zynqmp_dp *dp = connector_to_dp(connector);
return &dp->encoder;
}
static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct zynqmp_dp *dp = connector_to_dp(connector);
u8 max_lanes = dp->link_config.max_lanes;
u8 bpp = dp->config.bpp;
int max_rate = dp->link_config.max_rate;
int rate;
if (mode->clock > ZYNQMP_MAX_FREQ) {
dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n",
mode->name);
drm_mode_debug_printmodeline(mode);
return MODE_CLOCK_HIGH;
}
/* Check with link rate and lane count */
rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp);
if (mode->clock > rate) {
dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n",
mode->name);
drm_mode_debug_printmodeline(mode);
return MODE_CLOCK_HIGH;
}
return MODE_OK;
}
static const struct drm_connector_funcs zynqmp_dp_connector_funcs = {
.detect = zynqmp_dp_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
.reset = drm_atomic_helper_connector_reset,
};
static const struct drm_connector_helper_funcs
zynqmp_dp_connector_helper_funcs = {
.get_modes = zynqmp_dp_connector_get_modes,
.best_encoder = zynqmp_dp_connector_best_encoder,
.mode_valid = zynqmp_dp_connector_mode_valid,
};
/* -----------------------------------------------------------------------------
* DRM Encoder
*/
static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder)
{
struct zynqmp_dp *dp = encoder_to_dp(encoder);
unsigned int i;
int ret = 0;
pm_runtime_get_sync(dp->dev);
dp->enabled = true;
zynqmp_dp_update_misc(dp);
if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1);
zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0);
if (dp->status == connector_status_connected) {
for (i = 0; i < 3; i++) {
ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER,
DP_SET_POWER_D0);
if (ret == 1)
break;
usleep_range(300, 500);
}
/* Some monitors take time to wake up properly */
msleep(zynqmp_dp_power_on_delay_ms);
}
if (ret != 1)
dev_dbg(dp->dev, "DP aux failed\n");
else
zynqmp_dp_train_loop(dp);
zynqmp_dp_write(dp, ZYNQMP_DP_SOFTWARE_RESET,
ZYNQMP_DP_SOFTWARE_RESET_ALL);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1);
}
static void zynqmp_dp_encoder_disable(struct drm_encoder *encoder)
{
struct zynqmp_dp *dp = encoder_to_dp(encoder);
dp->enabled = false;
cancel_delayed_work(&dp->hpd_work);
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0);
drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0);
pm_runtime_put_sync(dp->dev);
}
static void
zynqmp_dp_encoder_atomic_mode_set(struct drm_encoder *encoder,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *connector_state)
{
struct zynqmp_dp *dp = encoder_to_dp(encoder);
struct drm_display_mode *mode = &crtc_state->mode;
struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
u8 max_lanes = dp->link_config.max_lanes;
u8 bpp = dp->config.bpp;
int rate, max_rate = dp->link_config.max_rate;
int ret;
zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8);
/* Check again as bpp or format might have been chagned */
rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp);
if (mode->clock > rate) {
dev_err(dp->dev, "the mode, %s,has too high pixel rate\n",
mode->name);
drm_mode_debug_printmodeline(mode);
}
ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0);
if (ret < 0)
return;
zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode);
zynqmp_dp_encoder_mode_set_stream(dp, adjusted_mode);
}
#define ZYNQMP_DP_MIN_H_BACKPORCH 20
static int
zynqmp_dp_encoder_atomic_check(struct drm_encoder *encoder,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct drm_display_mode *mode = &crtc_state->mode;
struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
int diff = mode->htotal - mode->hsync_end;
/*
* ZynqMP DP requires horizontal backporch to be greater than 12.
* This limitation may not be compatible with the sink device.
*/
if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) {
int vrefresh = (adjusted_mode->clock * 1000) /
(adjusted_mode->vtotal * adjusted_mode->htotal);
dev_dbg(encoder->dev->dev, "hbackporch adjusted: %d to %d",
diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff);
diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff;
adjusted_mode->htotal += diff;
adjusted_mode->clock = adjusted_mode->vtotal *
adjusted_mode->htotal * vrefresh / 1000;
}
return 0;
}
static const struct drm_encoder_helper_funcs zynqmp_dp_encoder_helper_funcs = {
.enable = zynqmp_dp_encoder_enable,
.disable = zynqmp_dp_encoder_disable,
.atomic_mode_set = zynqmp_dp_encoder_atomic_mode_set,
.atomic_check = zynqmp_dp_encoder_atomic_check,
};
/* -----------------------------------------------------------------------------
* Interrupt Handling
*/
/**
* zynqmp_dp_enable_vblank - Enable vblank
* @dp: DisplayPort IP core structure
*
* Enable vblank interrupt
*/
void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp)
{
zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_VBLANK_START);
}
/**
* zynqmp_dp_disable_vblank - Disable vblank
* @dp: DisplayPort IP core structure
*
* Disable vblank interrupt
*/
void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp)
{
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_VBLANK_START);
}
static void zynqmp_dp_hpd_work_func(struct work_struct *work)
{
struct zynqmp_dp *dp;
dp = container_of(work, struct zynqmp_dp, hpd_work.work);
if (dp->drm)
drm_helper_hpd_irq_event(dp->drm);
}
static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
{
struct zynqmp_dp *dp = (struct zynqmp_dp *)data;
u32 status, mask;
status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS);
mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK);
if (!(status & ~mask))
return IRQ_NONE;
/* dbg for diagnostic, but not much that the driver can do */
if (status & ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK)
dev_dbg_ratelimited(dp->dev, "underflow interrupt\n");
if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
dev_dbg_ratelimited(dp->dev, "overflow interrupt\n");
zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
if (status & ZYNQMP_DP_INT_VBLANK_START)
zynqmp_disp_handle_vblank(dp->dpsub->disp);
if (status & ZYNQMP_DP_INT_HPD_EVENT)
schedule_delayed_work(&dp->hpd_work, 0);
if (status & ZYNQMP_DP_INT_HPD_IRQ) {
int ret;
u8 status[DP_LINK_STATUS_SIZE + 2];
ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
DP_LINK_STATUS_SIZE + 2);
if (ret < 0)
goto handled;
if (status[4] & DP_LINK_STATUS_UPDATED ||
!drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) ||
!drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) {
zynqmp_dp_train_loop(dp);
}
}
handled:
return IRQ_HANDLED;
}
/* -----------------------------------------------------------------------------
* Initialization & Cleanup
*/
int zynqmp_dp_drm_init(struct zynqmp_dpsub *dpsub)
{
struct zynqmp_dp *dp = dpsub->dp;
struct drm_encoder *encoder = &dp->encoder;
struct drm_connector *connector = &dp->connector;
int ret;
dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK;
zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8);
/* Create the DRM encoder and connector. */
encoder->possible_crtcs |= zynqmp_disp_get_crtc_mask(dpsub->disp);
drm_simple_encoder_init(dp->drm, encoder, DRM_MODE_ENCODER_TMDS);
drm_encoder_helper_add(encoder, &zynqmp_dp_encoder_helper_funcs);
connector->polled = DRM_CONNECTOR_POLL_HPD;
ret = drm_connector_init(encoder->dev, connector,
&zynqmp_dp_connector_funcs,
DRM_MODE_CONNECTOR_DisplayPort);
if (ret) {
dev_err(dp->dev, "failed to create the DRM connector\n");
return ret;
}
drm_connector_helper_add(connector, &zynqmp_dp_connector_helper_funcs);
drm_connector_register(connector);
drm_connector_attach_encoder(connector, encoder);
/* Initialize and register the AUX adapter. */
ret = zynqmp_dp_aux_init(dp);
if (ret) {
dev_err(dp->dev, "failed to initialize DP aux\n");
return ret;
}
/* Now that initialisation is complete, enable interrupts. */
zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL);
return 0;
}
int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm)
{
struct platform_device *pdev = to_platform_device(dpsub->dev);
struct zynqmp_dp *dp;
struct resource *res;
int ret;
dp = drmm_kzalloc(drm, sizeof(*dp), GFP_KERNEL);
if (!dp)
return -ENOMEM;
dp->dev = &pdev->dev;
dp->dpsub = dpsub;
dp->status = connector_status_disconnected;
dp->drm = drm;
INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
dpsub->dp = dp;
/* Acquire all resources (IOMEM, IRQ and PHYs). */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp");
dp->iomem = devm_ioremap_resource(dp->dev, res);
if (IS_ERR(dp->iomem))
return PTR_ERR(dp->iomem);
dp->irq = platform_get_irq(pdev, 0);
if (dp->irq < 0)
return dp->irq;
dp->reset = devm_reset_control_get(dp->dev, NULL);
if (IS_ERR(dp->reset)) {
if (PTR_ERR(dp->reset) != -EPROBE_DEFER)
dev_err(dp->dev, "failed to get reset: %ld\n",
PTR_ERR(dp->reset));
return PTR_ERR(dp->reset);
}
ret = zynqmp_dp_reset(dp, false);
if (ret < 0)
return ret;
ret = zynqmp_dp_phy_probe(dp);
if (ret)
goto err_reset;
/* Initialize the hardware. */
zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
zynqmp_dp_set(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
zynqmp_dp_write(dp, ZYNQMP_DP_FORCE_SCRAMBLER_RESET, 1);
zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
ret = zynqmp_dp_phy_init(dp);
if (ret)
goto err_reset;
zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1);
/*
* Now that the hardware is initialized and won't generate spurious
* interrupts, request the IRQ.
*/
ret = devm_request_threaded_irq(dp->dev, dp->irq, NULL,
zynqmp_dp_irq_handler, IRQF_ONESHOT,
dev_name(dp->dev), dp);
if (ret < 0)
goto err_phy_exit;
dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n",
dp->num_lanes);
return 0;
err_phy_exit:
zynqmp_dp_phy_exit(dp);
err_reset:
zynqmp_dp_reset(dp, true);
return ret;
}
void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
{
struct zynqmp_dp *dp = dpsub->dp;
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL);
disable_irq(dp->irq);
cancel_delayed_work_sync(&dp->hpd_work);
zynqmp_dp_aux_cleanup(dp);
zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
zynqmp_dp_phy_exit(dp);
zynqmp_dp_reset(dp, true);
}