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drm/amd/display: Handle Y carry-over in VCP X.Y calculation

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[ 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>
This commit is contained in:
George Shen 2021-09-16 19:55:39 -04:00 committed by Greg Kroah-Hartman
parent 71a0cb1ba6
commit 63127374c8
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c
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@ -635,6 +635,12 @@ 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);