100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/delay.h>
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#include "mgag200_drv.h"
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void mgag200_bmc_disable_vidrst(struct mga_device *mdev)
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{
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u8 tmp;
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int iter_max;
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/*
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* 1 - The first step is to inform the BMC of an upcoming mode
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* change. We are putting the misc<0> to output.
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*/
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WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
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tmp = RREG8(DAC_DATA);
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tmp |= 0x10;
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WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
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/* we are putting a 1 on the misc<0> line */
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WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
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tmp = RREG8(DAC_DATA);
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tmp |= 0x10;
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WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
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/*
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* 2- Second step to mask any further scan request. This is
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* done by asserting the remfreqmsk bit (XSPAREREG<7>)
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*/
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WREG8(DAC_INDEX, MGA1064_SPAREREG);
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tmp = RREG8(DAC_DATA);
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tmp |= 0x80;
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WREG_DAC(MGA1064_SPAREREG, tmp);
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/*
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* 3a- The third step is to verify if there is an active scan.
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* We are waiting for a 0 on remhsyncsts <XSPAREREG<0>).
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*/
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iter_max = 300;
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while (!(tmp & 0x1) && iter_max) {
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WREG8(DAC_INDEX, MGA1064_SPAREREG);
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tmp = RREG8(DAC_DATA);
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udelay(1000);
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iter_max--;
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}
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/*
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* 3b- This step occurs only if the remove is actually
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* scanning. We are waiting for the end of the frame which is
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* a 1 on remvsyncsts (XSPAREREG<1>)
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*/
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if (iter_max) {
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iter_max = 300;
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while ((tmp & 0x2) && iter_max) {
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WREG8(DAC_INDEX, MGA1064_SPAREREG);
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tmp = RREG8(DAC_DATA);
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udelay(1000);
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iter_max--;
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}
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}
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}
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void mgag200_bmc_enable_vidrst(struct mga_device *mdev)
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{
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u8 tmp;
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/* Ensure that the vrsten and hrsten are set */
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WREG8(MGAREG_CRTCEXT_INDEX, 1);
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tmp = RREG8(MGAREG_CRTCEXT_DATA);
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WREG8(MGAREG_CRTCEXT_DATA, tmp | 0x88);
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/* Assert rstlvl2 */
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WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
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tmp = RREG8(DAC_DATA);
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tmp |= 0x8;
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WREG8(DAC_DATA, tmp);
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udelay(10);
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/* Deassert rstlvl2 */
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tmp &= ~0x08;
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WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
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WREG8(DAC_DATA, tmp);
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/* Remove mask of scan request */
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WREG8(DAC_INDEX, MGA1064_SPAREREG);
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tmp = RREG8(DAC_DATA);
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tmp &= ~0x80;
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WREG8(DAC_DATA, tmp);
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/* Put back a 0 on the misc<0> line */
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WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
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tmp = RREG8(DAC_DATA);
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tmp &= ~0x10;
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WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
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}
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