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drm/amd/display: Prevent VStartup Overflow

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[Why]
For some VR headsets with large blanks, it's possible
to overflow the OTG_VSTARTUP_PARAM:VSTARTUP_START
register. This can lead to incorrect DML calculations
and underflow downstream.

[How]
Min the calcualted max_vstartup_lines with the max
value of the register.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Ryan Seto <ryanseto@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ryan Seto
2025-02-28 14:24:57 -05:00
committed by Alex Deucher
parent 34935701b7
commit 29c1c20496
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c
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@@ -15,6 +15,7 @@
//#define DML_MODE_SUPPORT_USE_DPM_DRAM_BW
//#define DML_GLOBAL_PREFETCH_CHECK
#define ALLOW_SDPIF_RATE_LIMIT_PRE_CSTATE
#define DML_MAX_VSTARTUP_START 1023
const char *dml2_core_internal_bw_type_str(enum dml2_core_internal_bw_type bw_type)
{
@@ -3737,6 +3738,7 @@ static unsigned int CalculateMaxVStartup(
dml2_printf("DML::%s: vblank_avail = %u\n", __func__, vblank_avail);
dml2_printf("DML::%s: max_vstartup_lines = %u\n", __func__, max_vstartup_lines);
#endif
max_vstartup_lines = (unsigned int)math_min2(max_vstartup_lines, DML_MAX_VSTARTUP_START);
return max_vstartup_lines;
}