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linuxdebug/drivers/gpu/drm/sun4i/sun4i_backend.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2015 Free Electrons
* Copyright (C) 2015 NextThing Co
*
* Maxime Ripard <maxime.ripard@free-electrons.com>
*/
#include <linux/component.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_blend.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fb_dma_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_probe_helper.h>
#include "sun4i_backend.h"
#include "sun4i_drv.h"
#include "sun4i_frontend.h"
#include "sun4i_layer.h"
#include "sunxi_engine.h"
struct sun4i_backend_quirks {
/* backend <-> TCON muxing selection done in backend */
bool needs_output_muxing;
/* alpha at the lowest z position is not always supported */
bool supports_lowest_plane_alpha;
};
static const u32 sunxi_rgb2yuv_coef[12] = {
0x00000107, 0x00000204, 0x00000064, 0x00000108,
0x00003f69, 0x00003ed6, 0x000001c1, 0x00000808,
0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
};
static void sun4i_backend_apply_color_correction(struct sunxi_engine *engine)
{
int i;
DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n");
/* Set color correction */
regmap_write(engine->regs, SUN4I_BACKEND_OCCTL_REG,
SUN4I_BACKEND_OCCTL_ENABLE);
for (i = 0; i < 12; i++)
regmap_write(engine->regs, SUN4I_BACKEND_OCRCOEF_REG(i),
sunxi_rgb2yuv_coef[i]);
}
static void sun4i_backend_disable_color_correction(struct sunxi_engine *engine)
{
DRM_DEBUG_DRIVER("Disabling color correction\n");
/* Disable color correction */
regmap_update_bits(engine->regs, SUN4I_BACKEND_OCCTL_REG,
SUN4I_BACKEND_OCCTL_ENABLE, 0);
}
static void sun4i_backend_commit(struct sunxi_engine *engine)
{
DRM_DEBUG_DRIVER("Committing changes\n");
regmap_write(engine->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS |
SUN4I_BACKEND_REGBUFFCTL_LOADCTL);
}
void sun4i_backend_layer_enable(struct sun4i_backend *backend,
int layer, bool enable)
{
u32 val;
DRM_DEBUG_DRIVER("%sabling layer %d\n", enable ? "En" : "Dis",
layer);
if (enable)
val = SUN4I_BACKEND_MODCTL_LAY_EN(layer);
else
val = 0;
regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
SUN4I_BACKEND_MODCTL_LAY_EN(layer), val);
}
static int sun4i_backend_drm_format_to_layer(u32 format, u32 *mode)
{
switch (format) {
case DRM_FORMAT_ARGB8888:
*mode = SUN4I_BACKEND_LAY_FBFMT_ARGB8888;
break;
case DRM_FORMAT_ARGB4444:
*mode = SUN4I_BACKEND_LAY_FBFMT_ARGB4444;
break;
case DRM_FORMAT_ARGB1555:
*mode = SUN4I_BACKEND_LAY_FBFMT_ARGB1555;
break;
case DRM_FORMAT_RGBA5551:
*mode = SUN4I_BACKEND_LAY_FBFMT_RGBA5551;
break;
case DRM_FORMAT_RGBA4444:
*mode = SUN4I_BACKEND_LAY_FBFMT_RGBA4444;
break;
case DRM_FORMAT_XRGB8888:
*mode = SUN4I_BACKEND_LAY_FBFMT_XRGB8888;
break;
case DRM_FORMAT_RGB888:
*mode = SUN4I_BACKEND_LAY_FBFMT_RGB888;
break;
case DRM_FORMAT_RGB565:
*mode = SUN4I_BACKEND_LAY_FBFMT_RGB565;
break;
default:
return -EINVAL;
}
return 0;
}
static const uint32_t sun4i_backend_formats[] = {
DRM_FORMAT_ARGB1555,
DRM_FORMAT_ARGB4444,
DRM_FORMAT_ARGB8888,
DRM_FORMAT_RGB565,
DRM_FORMAT_RGB888,
DRM_FORMAT_RGBA4444,
DRM_FORMAT_RGBA5551,
DRM_FORMAT_UYVY,
DRM_FORMAT_VYUY,
DRM_FORMAT_XRGB8888,
DRM_FORMAT_YUYV,
DRM_FORMAT_YVYU,
};
bool sun4i_backend_format_is_supported(uint32_t fmt, uint64_t modifier)
{
unsigned int i;
if (modifier != DRM_FORMAT_MOD_LINEAR)
return false;
for (i = 0; i < ARRAY_SIZE(sun4i_backend_formats); i++)
if (sun4i_backend_formats[i] == fmt)
return true;
return false;
}
int sun4i_backend_update_layer_coord(struct sun4i_backend *backend,
int layer, struct drm_plane *plane)
{
struct drm_plane_state *state = plane->state;
DRM_DEBUG_DRIVER("Updating layer %d\n", layer);
/* Set height and width */
DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
state->crtc_w, state->crtc_h);
regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYSIZE_REG(layer),
SUN4I_BACKEND_LAYSIZE(state->crtc_w,
state->crtc_h));
/* Set base coordinates */
DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
state->crtc_x, state->crtc_y);
regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYCOOR_REG(layer),
SUN4I_BACKEND_LAYCOOR(state->crtc_x,
state->crtc_y));
return 0;
}
static int sun4i_backend_update_yuv_format(struct sun4i_backend *backend,
int layer, struct drm_plane *plane)
{
struct drm_plane_state *state = plane->state;
struct drm_framebuffer *fb = state->fb;
const struct drm_format_info *format = fb->format;
const uint32_t fmt = format->format;
u32 val = SUN4I_BACKEND_IYUVCTL_EN;
int i;
for (i = 0; i < ARRAY_SIZE(sunxi_bt601_yuv2rgb_coef); i++)
regmap_write(backend->engine.regs,
SUN4I_BACKEND_YGCOEF_REG(i),
sunxi_bt601_yuv2rgb_coef[i]);
/*
* We should do that only for a single plane, but the
* framebuffer's atomic_check has our back on this.
*/
regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer),
SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN,
SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN);
/* TODO: Add support for the multi-planar YUV formats */
if (drm_format_info_is_yuv_packed(format) &&
drm_format_info_is_yuv_sampling_422(format))
val |= SUN4I_BACKEND_IYUVCTL_FBFMT_PACKED_YUV422;
else
DRM_DEBUG_DRIVER("Unsupported YUV format (0x%x)\n", fmt);
/*
* Allwinner seems to list the pixel sequence from right to left, while
* DRM lists it from left to right.
*/
switch (fmt) {
case DRM_FORMAT_YUYV:
val |= SUN4I_BACKEND_IYUVCTL_FBPS_VYUY;
break;
case DRM_FORMAT_YVYU:
val |= SUN4I_BACKEND_IYUVCTL_FBPS_UYVY;
break;
case DRM_FORMAT_UYVY:
val |= SUN4I_BACKEND_IYUVCTL_FBPS_YVYU;
break;
case DRM_FORMAT_VYUY:
val |= SUN4I_BACKEND_IYUVCTL_FBPS_YUYV;
break;
default:
DRM_DEBUG_DRIVER("Unsupported YUV pixel sequence (0x%x)\n",
fmt);
}
regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVCTL_REG, val);
return 0;
}
int sun4i_backend_update_layer_formats(struct sun4i_backend *backend,
int layer, struct drm_plane *plane)
{
struct drm_plane_state *state = plane->state;
struct drm_framebuffer *fb = state->fb;
u32 val;
int ret;
/* Clear the YUV mode */
regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer),
SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 0);
val = SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA(state->alpha >> 8);
if (state->alpha != DRM_BLEND_ALPHA_OPAQUE)
val |= SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN;
regmap_update_bits(backend->engine.regs,
SUN4I_BACKEND_ATTCTL_REG0(layer),
SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_MASK |
SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN,
val);
if (fb->format->is_yuv)
return sun4i_backend_update_yuv_format(backend, layer, plane);
ret = sun4i_backend_drm_format_to_layer(fb->format->format, &val);
if (ret) {
DRM_DEBUG_DRIVER("Invalid format\n");
return ret;
}
regmap_update_bits(backend->engine.regs,
SUN4I_BACKEND_ATTCTL_REG1(layer),
SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val);
return 0;
}
int sun4i_backend_update_layer_frontend(struct sun4i_backend *backend,
int layer, uint32_t fmt)
{
u32 val;
int ret;
ret = sun4i_backend_drm_format_to_layer(fmt, &val);
if (ret) {
DRM_DEBUG_DRIVER("Invalid format\n");
return ret;
}
regmap_update_bits(backend->engine.regs,
SUN4I_BACKEND_ATTCTL_REG0(layer),
SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN,
SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN);
regmap_update_bits(backend->engine.regs,
SUN4I_BACKEND_ATTCTL_REG1(layer),
SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val);
return 0;
}
static int sun4i_backend_update_yuv_buffer(struct sun4i_backend *backend,
struct drm_framebuffer *fb,
dma_addr_t paddr)
{
/* TODO: Add support for the multi-planar YUV formats */
DRM_DEBUG_DRIVER("Setting packed YUV buffer address to %pad\n", &paddr);
regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVADD_REG(0), paddr);
DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8);
regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVLINEWIDTH_REG(0),
fb->pitches[0] * 8);
return 0;
}
int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend,
int layer, struct drm_plane *plane)
{
struct drm_plane_state *state = plane->state;
struct drm_framebuffer *fb = state->fb;
u32 lo_paddr, hi_paddr;
dma_addr_t dma_addr;
/* Set the line width */
DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8);
regmap_write(backend->engine.regs,
SUN4I_BACKEND_LAYLINEWIDTH_REG(layer),
fb->pitches[0] * 8);
/* Get the start of the displayed memory */
dma_addr = drm_fb_dma_get_gem_addr(fb, state, 0);
DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &dma_addr);
if (fb->format->is_yuv)
return sun4i_backend_update_yuv_buffer(backend, fb, dma_addr);
/* Write the 32 lower bits of the address (in bits) */
lo_paddr = dma_addr << 3;
DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr);
regmap_write(backend->engine.regs,
SUN4I_BACKEND_LAYFB_L32ADD_REG(layer),
lo_paddr);
/* And the upper bits */
hi_paddr = dma_addr >> 29;
DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr);
regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_LAYFB_H4ADD_REG,
SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer),
SUN4I_BACKEND_LAYFB_H4ADD(layer, hi_paddr));
return 0;
}
int sun4i_backend_update_layer_zpos(struct sun4i_backend *backend, int layer,
struct drm_plane *plane)
{
struct drm_plane_state *state = plane->state;
struct sun4i_layer_state *p_state = state_to_sun4i_layer_state(state);
unsigned int priority = state->normalized_zpos;
unsigned int pipe = p_state->pipe;
DRM_DEBUG_DRIVER("Setting layer %d's priority to %d and pipe %d\n",
layer, priority, pipe);
regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer),
SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK |
SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL_MASK,
SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(p_state->pipe) |
SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL(priority));
return 0;
}
void sun4i_backend_cleanup_layer(struct sun4i_backend *backend,
int layer)
{
regmap_update_bits(backend->engine.regs,
SUN4I_BACKEND_ATTCTL_REG0(layer),
SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN |
SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 0);
}
static bool sun4i_backend_plane_uses_scaler(struct drm_plane_state *state)
{
u16 src_h = state->src_h >> 16;
u16 src_w = state->src_w >> 16;
DRM_DEBUG_DRIVER("Input size %dx%d, output size %dx%d\n",
src_w, src_h, state->crtc_w, state->crtc_h);
if ((state->crtc_h != src_h) || (state->crtc_w != src_w))
return true;
return false;
}
static bool sun4i_backend_plane_uses_frontend(struct drm_plane_state *state)
{
struct sun4i_layer *layer = plane_to_sun4i_layer(state->plane);
struct sun4i_backend *backend = layer->backend;
uint32_t format = state->fb->format->format;
uint64_t modifier = state->fb->modifier;
if (IS_ERR(backend->frontend))
return false;
if (!sun4i_frontend_format_is_supported(format, modifier))
return false;
if (!sun4i_backend_format_is_supported(format, modifier))
return true;
/*
* TODO: The backend alone allows 2x and 4x integer scaling, including
* support for an alpha component (which the frontend doesn't support).
* Use the backend directly instead of the frontend in this case, with
* another test to return false.
*/
if (sun4i_backend_plane_uses_scaler(state))
return true;
/*
* Here the format is supported by both the frontend and the backend
* and no frontend scaling is required, so use the backend directly.
*/
return false;
}
static bool sun4i_backend_plane_is_supported(struct drm_plane_state *state,
bool *uses_frontend)
{
if (sun4i_backend_plane_uses_frontend(state)) {
*uses_frontend = true;
return true;
}
*uses_frontend = false;
/* Scaling is not supported without the frontend. */
if (sun4i_backend_plane_uses_scaler(state))
return false;
return true;
}
static void sun4i_backend_atomic_begin(struct sunxi_engine *engine,
struct drm_crtc_state *old_state)
{
u32 val;
WARN_ON(regmap_read_poll_timeout(engine->regs,
SUN4I_BACKEND_REGBUFFCTL_REG,
val, !(val & SUN4I_BACKEND_REGBUFFCTL_LOADCTL),
100, 50000));
}
static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
struct drm_crtc_state *crtc_state)
{
struct drm_plane_state *plane_states[SUN4I_BACKEND_NUM_LAYERS] = { 0 };
struct sun4i_backend *backend = engine_to_sun4i_backend(engine);
struct drm_atomic_state *state = crtc_state->state;
struct drm_device *drm = state->dev;
struct drm_plane *plane;
unsigned int num_planes = 0;
unsigned int num_alpha_planes = 0;
unsigned int num_frontend_planes = 0;
unsigned int num_alpha_planes_max = 1;
unsigned int num_yuv_planes = 0;
unsigned int current_pipe = 0;
unsigned int i;
DRM_DEBUG_DRIVER("Starting checking our planes\n");
if (!crtc_state->planes_changed)
return 0;
drm_for_each_plane_mask(plane, drm, crtc_state->plane_mask) {
struct drm_plane_state *plane_state =
drm_atomic_get_plane_state(state, plane);
struct sun4i_layer_state *layer_state =
state_to_sun4i_layer_state(plane_state);
struct drm_framebuffer *fb = plane_state->fb;
if (!sun4i_backend_plane_is_supported(plane_state,
&layer_state->uses_frontend))
return -EINVAL;
if (layer_state->uses_frontend) {
DRM_DEBUG_DRIVER("Using the frontend for plane %d\n",
plane->index);
num_frontend_planes++;
} else {
if (fb->format->is_yuv) {
DRM_DEBUG_DRIVER("Plane FB format is YUV\n");
num_yuv_planes++;
}
}
DRM_DEBUG_DRIVER("Plane FB format is %p4cc\n",
&fb->format->format);
if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE))
num_alpha_planes++;
DRM_DEBUG_DRIVER("Plane zpos is %d\n",
plane_state->normalized_zpos);
/* Sort our planes by Zpos */
plane_states[plane_state->normalized_zpos] = plane_state;
num_planes++;
}
/* All our planes were disabled, bail out */
if (!num_planes)
return 0;
/*
* The hardware is a bit unusual here.
*
* Even though it supports 4 layers, it does the composition
* in two separate steps.
*
* The first one is assigning a layer to one of its two
* pipes. If more that 1 layer is assigned to the same pipe,
* and if pixels overlaps, the pipe will take the pixel from
* the layer with the highest priority.
*
* The second step is the actual alpha blending, that takes
* the two pipes as input, and uses the potential alpha
* component to do the transparency between the two.
*
* This two-step scenario makes us unable to guarantee a
* robust alpha blending between the 4 layers in all
* situations, since this means that we need to have one layer
* with alpha at the lowest position of our two pipes.
*
* However, we cannot even do that on every platform, since
* the hardware has a bug where the lowest plane of the lowest
* pipe (pipe 0, priority 0), if it has any alpha, will
* discard the pixel data entirely and just display the pixels
* in the background color (black by default).
*
* This means that on the affected platforms, we effectively
* have only three valid configurations with alpha, all of
* them with the alpha being on pipe1 with the lowest
* position, which can be 1, 2 or 3 depending on the number of
* planes and their zpos.
*/
/* For platforms that are not affected by the issue described above. */
if (backend->quirks->supports_lowest_plane_alpha)
num_alpha_planes_max++;
if (num_alpha_planes > num_alpha_planes_max) {
DRM_DEBUG_DRIVER("Too many planes with alpha, rejecting...\n");
return -EINVAL;
}
/* We can't have an alpha plane at the lowest position */
if (!backend->quirks->supports_lowest_plane_alpha &&
(plane_states[0]->alpha != DRM_BLEND_ALPHA_OPAQUE))
return -EINVAL;
for (i = 1; i < num_planes; i++) {
struct drm_plane_state *p_state = plane_states[i];
struct drm_framebuffer *fb = p_state->fb;
struct sun4i_layer_state *s_state = state_to_sun4i_layer_state(p_state);
/*
* The only alpha position is the lowest plane of the
* second pipe.
*/
if (fb->format->has_alpha || (p_state->alpha != DRM_BLEND_ALPHA_OPAQUE))
current_pipe++;
s_state->pipe = current_pipe;
}
/* We can only have a single YUV plane at a time */
if (num_yuv_planes > SUN4I_BACKEND_NUM_YUV_PLANES) {
DRM_DEBUG_DRIVER("Too many planes with YUV, rejecting...\n");
return -EINVAL;
}
if (num_frontend_planes > SUN4I_BACKEND_NUM_FRONTEND_LAYERS) {
DRM_DEBUG_DRIVER("Too many planes going through the frontend, rejecting\n");
return -EINVAL;
}
DRM_DEBUG_DRIVER("State valid with %u planes, %u alpha, %u video, %u YUV\n",
num_planes, num_alpha_planes, num_frontend_planes,
num_yuv_planes);
return 0;
}
static void sun4i_backend_vblank_quirk(struct sunxi_engine *engine)
{
struct sun4i_backend *backend = engine_to_sun4i_backend(engine);
struct sun4i_frontend *frontend = backend->frontend;
if (!frontend)
return;
/*
* In a teardown scenario with the frontend involved, we have
* to keep the frontend enabled until the next vblank, and
* only then disable it.
*
* This is due to the fact that the backend will not take into
* account the new configuration (with the plane that used to
* be fed by the frontend now disabled) until we write to the
* commit bit and the hardware fetches the new configuration
* during the next vblank.
*
* So we keep the frontend around in order to prevent any
* visual artifacts.
*/
spin_lock(&backend->frontend_lock);
if (backend->frontend_teardown) {
sun4i_frontend_exit(frontend);
backend->frontend_teardown = false;
}
spin_unlock(&backend->frontend_lock);
};
static void sun4i_backend_mode_set(struct sunxi_engine *engine,
const struct drm_display_mode *mode)
{
bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
DRM_DEBUG_DRIVER("Updating global size W: %u H: %u\n",
mode->hdisplay, mode->vdisplay);
regmap_write(engine->regs, SUN4I_BACKEND_DISSIZE_REG,
SUN4I_BACKEND_DISSIZE(mode->hdisplay, mode->vdisplay));
regmap_update_bits(engine->regs, SUN4I_BACKEND_MODCTL_REG,
SUN4I_BACKEND_MODCTL_ITLMOD_EN,
interlaced ? SUN4I_BACKEND_MODCTL_ITLMOD_EN : 0);
DRM_DEBUG_DRIVER("Switching display backend interlaced mode %s\n",
interlaced ? "on" : "off");
}
static int sun4i_backend_init_sat(struct device *dev) {
struct sun4i_backend *backend = dev_get_drvdata(dev);
int ret;
backend->sat_reset = devm_reset_control_get(dev, "sat");
if (IS_ERR(backend->sat_reset)) {
dev_err(dev, "Couldn't get the SAT reset line\n");
return PTR_ERR(backend->sat_reset);
}
ret = reset_control_deassert(backend->sat_reset);
if (ret) {
dev_err(dev, "Couldn't deassert the SAT reset line\n");
return ret;
}
backend->sat_clk = devm_clk_get(dev, "sat");
if (IS_ERR(backend->sat_clk)) {
dev_err(dev, "Couldn't get our SAT clock\n");
ret = PTR_ERR(backend->sat_clk);
goto err_assert_reset;
}
ret = clk_prepare_enable(backend->sat_clk);
if (ret) {
dev_err(dev, "Couldn't enable the SAT clock\n");
return ret;
}
return 0;
err_assert_reset:
reset_control_assert(backend->sat_reset);
return ret;
}
static int sun4i_backend_free_sat(struct device *dev) {
struct sun4i_backend *backend = dev_get_drvdata(dev);
clk_disable_unprepare(backend->sat_clk);
reset_control_assert(backend->sat_reset);
return 0;
}
/*
* The display backend can take video output from the display frontend, or
* the display enhancement unit on the A80, as input for one it its layers.
* This relationship within the display pipeline is encoded in the device
* tree with of_graph, and we use it here to figure out which backend, if
* there are 2 or more, we are currently probing. The number would be in
* the "reg" property of the upstream output port endpoint.
*/
static int sun4i_backend_of_get_id(struct device_node *node)
{
struct device_node *ep, *remote;
struct of_endpoint of_ep;
/* Input port is 0, and we want the first endpoint. */
ep = of_graph_get_endpoint_by_regs(node, 0, -1);
if (!ep)
return -EINVAL;
remote = of_graph_get_remote_endpoint(ep);
of_node_put(ep);
if (!remote)
return -EINVAL;
of_graph_parse_endpoint(remote, &of_ep);
of_node_put(remote);
return of_ep.id;
}
/* TODO: This needs to take multiple pipelines into account */
static struct sun4i_frontend *sun4i_backend_find_frontend(struct sun4i_drv *drv,
struct device_node *node)
{
struct device_node *port, *ep, *remote;
struct sun4i_frontend *frontend;
port = of_graph_get_port_by_id(node, 0);
if (!port)
return ERR_PTR(-EINVAL);
for_each_available_child_of_node(port, ep) {
remote = of_graph_get_remote_port_parent(ep);
if (!remote)
continue;
of_node_put(remote);
/* does this node match any registered engines? */
list_for_each_entry(frontend, &drv->frontend_list, list) {
if (remote == frontend->node) {
of_node_put(port);
of_node_put(ep);
return frontend;
}
}
}
of_node_put(port);
return ERR_PTR(-EINVAL);
}
static const struct sunxi_engine_ops sun4i_backend_engine_ops = {
.atomic_begin = sun4i_backend_atomic_begin,
.atomic_check = sun4i_backend_atomic_check,
.commit = sun4i_backend_commit,
.layers_init = sun4i_layers_init,
.apply_color_correction = sun4i_backend_apply_color_correction,
.disable_color_correction = sun4i_backend_disable_color_correction,
.vblank_quirk = sun4i_backend_vblank_quirk,
.mode_set = sun4i_backend_mode_set,
};
static const struct regmap_config sun4i_backend_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = 0x5800,
};
static int sun4i_backend_bind(struct device *dev, struct device *master,
void *data)
{
struct platform_device *pdev = to_platform_device(dev);
struct drm_device *drm = data;
struct sun4i_drv *drv = drm->dev_private;
struct sun4i_backend *backend;
const struct sun4i_backend_quirks *quirks;
void __iomem *regs;
int i, ret;
backend = devm_kzalloc(dev, sizeof(*backend), GFP_KERNEL);
if (!backend)
return -ENOMEM;
dev_set_drvdata(dev, backend);
spin_lock_init(&backend->frontend_lock);
if (of_find_property(dev->of_node, "interconnects", NULL)) {
/*
* This assume we have the same DMA constraints for all our the
* devices in our pipeline (all the backends, but also the
* frontends). This sounds bad, but it has always been the case
* for us, and DRM doesn't do per-device allocation either, so
* we would need to fix DRM first...
*/
ret = of_dma_configure(drm->dev, dev->of_node, true);
if (ret)
return ret;
}
backend->engine.node = dev->of_node;
backend->engine.ops = &sun4i_backend_engine_ops;
backend->engine.id = sun4i_backend_of_get_id(dev->of_node);
if (backend->engine.id < 0)
return backend->engine.id;
backend->frontend = sun4i_backend_find_frontend(drv, dev->of_node);
if (IS_ERR(backend->frontend))
dev_warn(dev, "Couldn't find matching frontend, frontend features disabled\n");
regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(regs))
return PTR_ERR(regs);
backend->reset = devm_reset_control_get(dev, NULL);
if (IS_ERR(backend->reset)) {
dev_err(dev, "Couldn't get our reset line\n");
return PTR_ERR(backend->reset);
}
ret = reset_control_deassert(backend->reset);
if (ret) {
dev_err(dev, "Couldn't deassert our reset line\n");
return ret;
}
backend->bus_clk = devm_clk_get(dev, "ahb");
if (IS_ERR(backend->bus_clk)) {
dev_err(dev, "Couldn't get the backend bus clock\n");
ret = PTR_ERR(backend->bus_clk);
goto err_assert_reset;
}
clk_prepare_enable(backend->bus_clk);
backend->mod_clk = devm_clk_get(dev, "mod");
if (IS_ERR(backend->mod_clk)) {
dev_err(dev, "Couldn't get the backend module clock\n");
ret = PTR_ERR(backend->mod_clk);
goto err_disable_bus_clk;
}
ret = clk_set_rate_exclusive(backend->mod_clk, 300000000);
if (ret) {
dev_err(dev, "Couldn't set the module clock frequency\n");
goto err_disable_bus_clk;
}
clk_prepare_enable(backend->mod_clk);
backend->ram_clk = devm_clk_get(dev, "ram");
if (IS_ERR(backend->ram_clk)) {
dev_err(dev, "Couldn't get the backend RAM clock\n");
ret = PTR_ERR(backend->ram_clk);
goto err_disable_mod_clk;
}
clk_prepare_enable(backend->ram_clk);
if (of_device_is_compatible(dev->of_node,
"allwinner,sun8i-a33-display-backend")) {
ret = sun4i_backend_init_sat(dev);
if (ret) {
dev_err(dev, "Couldn't init SAT resources\n");
goto err_disable_ram_clk;
}
}
backend->engine.regs = devm_regmap_init_mmio(dev, regs,
&sun4i_backend_regmap_config);
if (IS_ERR(backend->engine.regs)) {
dev_err(dev, "Couldn't create the backend regmap\n");
return PTR_ERR(backend->engine.regs);
}
list_add_tail(&backend->engine.list, &drv->engine_list);
/*
* Many of the backend's layer configuration registers have
* undefined default values. This poses a risk as we use
* regmap_update_bits in some places, and don't overwrite
* the whole register.
*
* Clear the registers here to have something predictable.
*/
for (i = 0x800; i < 0x1000; i += 4)
regmap_write(backend->engine.regs, i, 0);
/* Disable registers autoloading */
regmap_write(backend->engine.regs, SUN4I_BACKEND_REGBUFFCTL_REG,
SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS);
/* Enable the backend */
regmap_write(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
SUN4I_BACKEND_MODCTL_DEBE_EN |
SUN4I_BACKEND_MODCTL_START_CTL);
/* Set output selection if needed */
quirks = of_device_get_match_data(dev);
if (quirks->needs_output_muxing) {
/*
* We assume there is no dynamic muxing of backends
* and TCONs, so we select the backend with same ID.
*
* While dynamic selection might be interesting, since
* the CRTC is tied to the TCON, while the layers are
* tied to the backends, this means, we will need to
* switch between groups of layers. There might not be
* a way to represent this constraint in DRM.
*/
regmap_update_bits(backend->engine.regs,
SUN4I_BACKEND_MODCTL_REG,
SUN4I_BACKEND_MODCTL_OUT_SEL,
(backend->engine.id
? SUN4I_BACKEND_MODCTL_OUT_LCD1
: SUN4I_BACKEND_MODCTL_OUT_LCD0));
}
backend->quirks = quirks;
return 0;
err_disable_ram_clk:
clk_disable_unprepare(backend->ram_clk);
err_disable_mod_clk:
clk_rate_exclusive_put(backend->mod_clk);
clk_disable_unprepare(backend->mod_clk);
err_disable_bus_clk:
clk_disable_unprepare(backend->bus_clk);
err_assert_reset:
reset_control_assert(backend->reset);
return ret;
}
static void sun4i_backend_unbind(struct device *dev, struct device *master,
void *data)
{
struct sun4i_backend *backend = dev_get_drvdata(dev);
list_del(&backend->engine.list);
if (of_device_is_compatible(dev->of_node,
"allwinner,sun8i-a33-display-backend"))
sun4i_backend_free_sat(dev);
clk_disable_unprepare(backend->ram_clk);
clk_rate_exclusive_put(backend->mod_clk);
clk_disable_unprepare(backend->mod_clk);
clk_disable_unprepare(backend->bus_clk);
reset_control_assert(backend->reset);
}
static const struct component_ops sun4i_backend_ops = {
.bind = sun4i_backend_bind,
.unbind = sun4i_backend_unbind,
};
static int sun4i_backend_probe(struct platform_device *pdev)
{
return component_add(&pdev->dev, &sun4i_backend_ops);
}
static int sun4i_backend_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &sun4i_backend_ops);
return 0;
}
static const struct sun4i_backend_quirks sun4i_backend_quirks = {
.needs_output_muxing = true,
};
static const struct sun4i_backend_quirks sun5i_backend_quirks = {
};
static const struct sun4i_backend_quirks sun6i_backend_quirks = {
};
static const struct sun4i_backend_quirks sun7i_backend_quirks = {
.needs_output_muxing = true,
};
static const struct sun4i_backend_quirks sun8i_a33_backend_quirks = {
.supports_lowest_plane_alpha = true,
};
static const struct sun4i_backend_quirks sun9i_backend_quirks = {
};
static const struct of_device_id sun4i_backend_of_table[] = {
{
.compatible = "allwinner,sun4i-a10-display-backend",
.data = &sun4i_backend_quirks,
},
{
.compatible = "allwinner,sun5i-a13-display-backend",
.data = &sun5i_backend_quirks,
},
{
.compatible = "allwinner,sun6i-a31-display-backend",
.data = &sun6i_backend_quirks,
},
{
.compatible = "allwinner,sun7i-a20-display-backend",
.data = &sun7i_backend_quirks,
},
{
.compatible = "allwinner,sun8i-a23-display-backend",
.data = &sun8i_a33_backend_quirks,
},
{
.compatible = "allwinner,sun8i-a33-display-backend",
.data = &sun8i_a33_backend_quirks,
},
{
.compatible = "allwinner,sun9i-a80-display-backend",
.data = &sun9i_backend_quirks,
},
{ }
};
MODULE_DEVICE_TABLE(of, sun4i_backend_of_table);
static struct platform_driver sun4i_backend_platform_driver = {
.probe = sun4i_backend_probe,
.remove = sun4i_backend_remove,
.driver = {
.name = "sun4i-backend",
.of_match_table = sun4i_backend_of_table,
},
};
module_platform_driver(sun4i_backend_platform_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A10 Display Backend Driver");
MODULE_LICENSE("GPL");