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drm/amd/display: Don't program BLNDGAM_MEM_PWR_FORCE when CM low-power is disabled on DCN30

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Before commit 33056a97ae ("drm/amd/display: Remove double checks for
`debug.enable_mem_low_power.bits.cm`"), dpp3_program_blnd_lut(NULL)
checked the low-power debug flag before calling
dpp3_power_on_blnd_lut(false).

After commit 33056a97ae ("drm/amd/display: Remove double checks for
`debug.enable_mem_low_power.bits.cm`"), dpp3_program_blnd_lut(NULL)
unconditionally calls dpp3_power_on_blnd_lut(false). The BLNDGAM power
helper writes BLNDGAM_MEM_PWR_FORCE when CM low-power is disabled, causing
immediate SRAM power toggles instead of deferring at vupdate. This can
disrupt atomic color/LUT sequencing during transitions between
direct scanout and composition within gamescope's DRM backend on
Steam Deck OLED.

To fix this, leave the BLNDGAM power state unchanged when low-power is
disabled, matching dpp3_power_on_hdr3dlut and dpp3_power_on_shaper.

Fixes: 33056a97ae ("drm/amd/display: Remove double checks for `debug.enable_mem_low_power.bits.cm`")
Signed-off-by: Matthew Schwartz <matthew.schwartz@linux.dev>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Matthew Schwartz
2025-10-20 16:09:34 -07:00
committed by Alex Deucher
parent 214eb7e83d
commit 13ff4f63fc
1 changed files with 0 additions and 3 deletions
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3
drivers/gpu/drm/amd/display/dc/dpp/dcn30/dcn30_dpp.c
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@@ -582,9 +582,6 @@ static void dpp3_power_on_blnd_lut(
dpp_base->ctx->dc->optimized_required = true;
dpp_base->deferred_reg_writes.bits.disable_blnd_lut = true;
}
} else {
REG_SET(CM_MEM_PWR_CTRL, 0,
BLNDGAM_MEM_PWR_FORCE, power_on == true ? 0 : 1);
}
}