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drm/amd/display: Lock DC and exit IPS when changing backlight

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Backlight updates require aux and/or register access. Therefore, driver
needs to disallow IPS beforehand.

So, acquire the dc lock before calling into dc to update backlight - we
should be doing this regardless of IPS. Then, while the lock is held,
disallow IPS before calling into dc, then allow IPS afterwards (if it
was previously allowed).

Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Roman Li <roman.li@amd.com>
Signed-off-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 988fe28626)
Cc: stable@vger.kernel.org # 6.10+
This commit is contained in:
Leo Li 2024-08-20 14:34:15 -04:00 committed by Alex Deucher
parent 4de34b0478
commit 53c3685f53
1 changed files with 12 additions and 1 deletions
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13
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -4516,7 +4516,7 @@ static void amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
struct amdgpu_dm_backlight_caps caps;
struct dc_link *link;
u32 brightness;
bool rc;
bool rc, reallow_idle = false;
amdgpu_dm_update_backlight_caps(dm, bl_idx);
caps = dm->backlight_caps[bl_idx];
@ -4529,6 +4529,12 @@ static void amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
link = (struct dc_link *)dm->backlight_link[bl_idx];
/* Change brightness based on AUX property */
mutex_lock(&dm->dc_lock);
if (dm->dc->caps.ips_support && dm->dc->ctx->dmub_srv->idle_allowed) {
dc_allow_idle_optimizations(dm->dc, false);
reallow_idle = true;
}
if (caps.aux_support) {
rc = dc_link_set_backlight_level_nits(link, true, brightness,
AUX_BL_DEFAULT_TRANSITION_TIME_MS);
@ -4540,6 +4546,11 @@ static void amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
DRM_DEBUG("DM: Failed to update backlight on eDP[%d]\n", bl_idx);
}
if (dm->dc->caps.ips_support && reallow_idle)
dc_allow_idle_optimizations(dm->dc, true);
mutex_unlock(&dm->dc_lock);
if (rc)
dm->actual_brightness[bl_idx] = user_brightness;
}