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drm/amd/display: Clamp VStartup value at DML calculations time

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[why]
Some timings with a large VBlank cause the value to overflow the
register related, while also producing other wrong values in DML output.

[how]
Clamp VStartup at the DCN3.1 maximum value

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Bindu Ramamurthy <bindu.r@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nikola Cornij 2021-06-07 20:36:05 -04:00 committed by Alex Deucher
parent d9b20b45ec
commit 5d9e7fe8ef
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c
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@ -2668,6 +2668,8 @@ static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerforman
(double) v->WritebackDelay[v->VoltageLevel][k]
/ (v->HTotal[k] / v->PixelClock[k]),
1));
if (v->MaxVStartupLines[k] > 1023)
v->MaxVStartupLines[k] = 1023;
#ifdef __DML_VBA_DEBUG__
dml_print("DML::%s: k=%d MaxVStartupLines = %d\n", __func__, k, v->MaxVStartupLines[k]);
@ -5064,6 +5066,8 @@ void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
/ (v->HTotal[k]
/ v->PixelClock[k]),
1.0));
if (v->MaximumVStartup[i][j][k] > 1023)
v->MaximumVStartup[i][j][k] = 1023;
v->MaxMaxVStartup[i][j] = dml_max(v->MaxMaxVStartup[i][j], v->MaximumVStartup[i][j][k]);
}
}