6.6-stable review patch. If anyone has any objections, please let me know.
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From: Wen Chen Wen.Chen3@amd.com
[ Upstream commit 01f60348d8fb6b3fbcdfc7bdde5d669f95b009a4 ]
[why] DCN35 is having “DC: failed to blank crtc!” when running HPO test cases. It's caused by not having sufficient udelay time.
[how] Replace the old wait_for_blank_complete function with fsleep function to sleep just until the next frame should come up. This way it doesn't poll in case the pixel clock or other clock was bugged or until vactive and the vblank are hit again.
Reviewed-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Signed-off-by: Wen Chen Wen.Chen3@amd.com Signed-off-by: Fangzhi Zuo jerry.zuo@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c index f3c682c7fbe6..f0b472e84a53 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c @@ -781,7 +781,7 @@ enum dc_status dcn20_enable_stream_timing( return DC_ERROR_UNEXPECTED; }
- hws->funcs.wait_for_blank_complete(pipe_ctx->stream_res.opp); + fsleep(stream->timing.v_total * (stream->timing.h_total * 10000u / stream->timing.pix_clk_100hz));
params.vertical_total_min = stream->adjust.v_total_min; params.vertical_total_max = stream->adjust.v_total_max;