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drm/amd/display: Reset steer fifo before unblanking the stream

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[why]
During mode transition steer fifo could overflow. Quite often it
recovers by itself, but sometimes it doesn't.

[how]
Add steer fifo reset before unblanking the stream. Also add a short
delay when resetting dig resync fifo to make sure register writes
don't end up back-to-back, in which case the HW might miss the reset
request.

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nikola Cornij 2019-11-11 18:03:59 -05:00 committed by Alex Deucher
parent 084e1de7b9
commit 949ffc8b36
1 changed files with 10 additions and 2 deletions
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12
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_stream_encoder.c
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@ -488,15 +488,23 @@ void enc2_stream_encoder_dp_unblank(
DP_VID_N_MUL, n_multiply);
}
/* set DIG_START to 0x1 to reset FIFO */
/* make sure stream is disabled before resetting steer fifo */
REG_UPDATE(DP_VID_STREAM_CNTL, DP_VID_STREAM_ENABLE, false);
REG_WAIT(DP_VID_STREAM_CNTL, DP_VID_STREAM_STATUS, 0, 10, 5000);
/* set DIG_START to 0x1 to reset FIFO */
REG_UPDATE(DIG_FE_CNTL, DIG_START, 1);
udelay(1);
/* write 0 to take the FIFO out of reset */
REG_UPDATE(DIG_FE_CNTL, DIG_START, 0);
/* switch DP encoder to CRTC data */
/* switch DP encoder to CRTC data, but reset it the fifo first. It may happen
* that it overflows during mode transition, and sometimes doesn't recover.
*/
REG_UPDATE(DP_STEER_FIFO, DP_STEER_FIFO_RESET, 1);
udelay(10);
REG_UPDATE(DP_STEER_FIFO, DP_STEER_FIFO_RESET, 0);