[mutter/benzea/gamma-fix-master: 13/13] kms/crtc: Always consider gamma state valid

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit d586d06b39085d1b725ed1a0d72df3f41d4d8f9a
Author: Benjamin Berg <bberg redhat com>
Date:   Mon Sep 7 16:15:30 2020 +0200

    kms/crtc: Always consider gamma state valid
    
    The gamma curve remains valid even if the CRTC is turned off. As such,
    there is no need to clear it and doing so breaks reading the gamma curve
    while the screens are turned off using DPMS.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1420
    
    Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1392

 src/backends/native/meta-kms-crtc.c | 32 --------------------------------
 1 file changed, 32 deletions(-)
---
diff --git a/src/backends/native/meta-kms-crtc.c b/src/backends/native/meta-kms-crtc.c
index f5547567b8..ebdd8ed9d5 100644
--- a/src/backends/native/meta-kms-crtc.c
+++ b/src/backends/native/meta-kms-crtc.c
@@ -156,13 +156,10 @@ void
 meta_kms_crtc_predict_state (MetaKmsCrtc   *crtc,
                              MetaKmsUpdate *update)
 {
-  gboolean is_gamma_valid;
   GList *mode_sets;
   GList *crtc_gammas;
   GList *l;
 
-  is_gamma_valid = TRUE;
-
   mode_sets = meta_kms_update_get_mode_sets (update);
   for (l = mode_sets; l; l = l->next)
     {
@@ -190,8 +187,6 @@ meta_kms_crtc_predict_state (MetaKmsCrtc   *crtc,
           crtc->current_state.drm_mode = (drmModeModeInfo) { 0 };
         }
 
-      is_gamma_valid = FALSE;
-
       break;
     }
 
@@ -212,35 +207,8 @@ meta_kms_crtc_predict_state (MetaKmsCrtc   *crtc,
       crtc->current_state.gamma.blue =
         g_memdup (gamma->blue, gamma->size * sizeof (uint16_t));
 
-      is_gamma_valid = TRUE;
       break;
     }
-
-  if (!is_gamma_valid)
-    {
-      if (crtc->current_state.is_drm_mode_valid)
-        {
-          MetaKmsImplDevice *impl_device;
-          drmModeCrtc *drm_crtc;
-
-          impl_device = meta_kms_device_get_impl_device (crtc->device);
-          drm_crtc = drmModeGetCrtc (meta_kms_impl_device_get_fd (impl_device),
-                                     crtc->id);
-          if (drm_crtc)
-            {
-              read_gamma_state (crtc, impl_device, drm_crtc);
-              drmModeFreeCrtc (drm_crtc);
-            }
-          else
-            {
-              clear_gamma_state (crtc);
-            }
-        }
-      else
-        {
-          clear_gamma_state (crtc);
-        }
-    }
 }
 
 MetaKmsCrtc *