From: Leo Li <sunpeng.li@xxxxxxx>
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).
Cc: stable@xxxxxxxxxxxxxxx # 6.10+
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Reviewed-by: Roman Li <roman.li@xxxxxxx>
Signed-off-by: Leo Li <sunpeng.li@xxxxxxx>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 351f8b0fe7a1..fa26b8d59f23 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4512,7 +4512,7 @@ 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];
@@ -4525,6 +4525,12 @@ 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);
@@ -4536,6 +4542,11 @@ 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;
}
--
2.46.0
