Revert "drm/amd/display: Only restore backlight after amdgpu_dm_init or dm_resume"

This fix regressed the original issue that commit d83c747a1225 ("drm/amd/display: Fix brightness level not retained over reboot") solved, so revert it until a different approach to solve the regression that it caused with AMD_PRIVATE_COLOR is found.

Fixes a490c8d77d50 ("drm/amd/display: Only restore backlight after amdgpu_dm_init or dm_resume")

Closes https://gitlab.freedesktop.org/drm/amd/-/issues/4620

Cc [email protected]

Signed-off-by Matthew Schwartz <[email protected]>

---
v1 -> v2:
- Fix missing stable tag

---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 12 ++++--------
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  7 -------
 2 files changed, 4 insertions(+), 15 deletions(-)

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +4 -8

index 8e1622bf7a42..21281e684b84 100644
@@ -2081,8 +2081,6 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 
        dc_hardware_init(adev->dm.dc);
 
-       adev->dm.restore_backlight = true;
-
        adev->dm.hpd_rx_offload_wq = hpd_rx_irq_create_workqueue(adev);
        if (!adev->dm.hpd_rx_offload_wq) {
                drm_err(adev_to_drm(adev), "failed to create hpd rx offload workqueue.\n");

@@ -3438,7 +3436,6 @@ static int dm_resume(struct amdgpu_ip_block *ip_block)
                dc_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D0);
 
                dc_resume(dm->dc);
-               adev->dm.restore_backlight = true;
 
                amdgpu_dm_irq_resume_early(adev);
 

@@ -9965,6 +9962,7 @@ static void amdgpu_dm_commit_streams(struct drm_atomic_state *state,
        bool mode_set_reset_required = false;
        u32 i;
        struct dc_commit_streams_params params = {dc_state->streams, dc_state->stream_count};
+       bool set_backlight_level = false;
 
        /* Disable writeback */
        for_each_old_connector_in_state(state, connector, old_con_state, i) {

@@ -10084,6 +10082,7 @@ static void amdgpu_dm_commit_streams(struct drm_atomic_state *state,
                        acrtc->hw_mode = new_crtc_state->mode;
                        crtc->hwmode = new_crtc_state->mode;
                        mode_set_reset_required = true;
+                       set_backlight_level = true;
                } else if (modereset_required(new_crtc_state)) {
                        drm_dbg_atomic(dev,
                                       "Atomic commit: RESET. crtc id %d:[%p]\n",

@@ -10140,16 +10139,13 @@ static void amdgpu_dm_commit_streams(struct drm_atomic_state *state,
         * to fix a flicker issue.
         * It will cause the dm->actual_brightness is not the current panel brightness
         * level. (the dm->brightness is the correct panel level)
-        * So we set the backlight level with dm->brightness value after initial
-        * set mode. Use restore_backlight flag to avoid setting backlight level
-        * for every subsequent mode set.
+        * So we set the backlight level with dm->brightness value after set mode
         */
-       if (dm->restore_backlight) {
+       if (set_backlight_level) {
                for (i = 0; i < dm->num_of_edps; i++) {
                        if (dm->backlight_dev[i])
                                amdgpu_dm_backlight_set_level(dm, i, dm->brightness[i]);
                }
-               dm->restore_backlight = false;
        }
 }
 

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h +0 -8

index 009f206226f0..db75e991ac7b 100644
@@ -630,13 +630,6 @@ struct amdgpu_display_manager {
         */
        u32 actual_brightness[AMDGPU_DM_MAX_NUM_EDP];
 
-       /**
-        * @restore_backlight:
-        *
-        * Flag to indicate whether to restore backlight after modeset.
-        */
-       bool restore_backlight;
-
        /**
         * @aux_hpd_discon_quirk:
         *
--

2.51.0