4.19-stable review patch. If anyone has any objections, please let me know.
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From: George Shen george.shen@amd.com
[ Upstream commit 3626a6aebe62ce7067cdc460c0c644e9445386bb ]
[Why/How] Theoretically rare corner case where ceil(Y) results in rounding up to an integer. If this happens, the 1 should be carried over to the X value.
Reviewed-by: Wenjing Liu wenjing.liu@amd.com Acked-by: Anson Jacob Anson.Jacob@amd.com Signed-off-by: George Shen george.shen@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/dcn10/dcn10_stream_encoder.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c index 6f9078f3c4d39..17bcf7ce4099c 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c @@ -620,6 +620,12 @@ void enc1_stream_encoder_set_mst_bandwidth( x), 26));
+ // If y rounds up to integer, carry it over to x. + if (y >> 26) { + x += 1; + y = 0; + } + REG_SET_2(DP_MSE_RATE_CNTL, 0, DP_MSE_RATE_X, x, DP_MSE_RATE_Y, y);