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

commit 719564737a upstream.

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.

CC: stable@vger.kernel.org
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
George Shen 2021-09-16 19:55:39 -04:00 committed by Greg Kroah-Hartman
parent 3340541aa7
commit eb93f6f304
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c
View File

@ -395,6 +395,12 @@ void dcn31_hpo_dp_link_enc_set_throttled_vcp_size(
x),
25));
// If y rounds up to integer, carry it over to x.
if (y >> 25) {
x += 1;
y = 0;
}
switch (stream_encoder_inst) {
case 0:
REG_SET_2(DP_DPHY_SYM32_VC_RATE_CNTL0, 0,