Revert "drm/amd/display: Enable Freesync Video Mode by default"

This reverts commit de05abe6b9d0fe08f65d744f7f75a4cba4df27ad.

The bug referenced below was bisected to this commit. There has been no
activity toward fixing it in 3 months, so let's revert for now.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2162
Signed-off-by: Michel Dänzer <mdaenzer@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 6b74df4..e3e2e6e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -195,6 +195,7 @@ extern int amdgpu_emu_mode;
 extern uint amdgpu_smu_memory_pool_size;
 extern int amdgpu_smu_pptable_id;
 extern uint amdgpu_dc_feature_mask;
+extern uint amdgpu_freesync_vid_mode;
 extern uint amdgpu_dc_debug_mask;
 extern uint amdgpu_dc_visual_confirm;
 extern uint amdgpu_dm_abm_level;

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index b4f2d61..1353ffd 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -181,6 +181,7 @@ int amdgpu_mes_kiq;
 int amdgpu_noretry = -1;
 int amdgpu_force_asic_type = -1;
 int amdgpu_tmz = -1; /* auto */
+uint amdgpu_freesync_vid_mode;
 int amdgpu_reset_method = -1; /* auto */
 int amdgpu_num_kcq = -1;
 int amdgpu_smartshift_bias;
@@ -880,6 +881,32 @@ MODULE_PARM_DESC(tmz, "Enable TMZ feature (-1 = auto (default), 0 = off, 1 = on)
 module_param_named(tmz, amdgpu_tmz, int, 0444);
 
 /**
+ * DOC: freesync_video (uint)
+ * Enable the optimization to adjust front porch timing to achieve seamless
+ * mode change experience when setting a freesync supported mode for which full
+ * modeset is not needed.
+ *
+ * The Display Core will add a set of modes derived from the base FreeSync
+ * video mode into the corresponding connector's mode list based on commonly
+ * used refresh rates and VRR range of the connected display, when users enable
+ * this feature. From the userspace perspective, they can see a seamless mode
+ * change experience when the change between different refresh rates under the
+ * same resolution. Additionally, userspace applications such as Video playback
+ * can read this modeset list and change the refresh rate based on the video
+ * frame rate. Finally, the userspace can also derive an appropriate mode for a
+ * particular refresh rate based on the FreeSync Mode and add it to the
+ * connector's mode list.
+ *
+ * Note: This is an experimental feature.
+ *
+ * The default value: 0 (off).
+ */
+MODULE_PARM_DESC(
+       freesync_video,
+       "Enable freesync modesetting optimization feature (0 = off (default), 1 = on)");
+module_param_named(freesync_video, amdgpu_freesync_vid_mode, uint, 0444);
+
+/**
  * DOC: reset_method (int)
  * GPU reset method (-1 = auto (default), 0 = legacy, 1 = mode0, 2 = mode1, 3 = mode2, 4 = baco)
  */

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 86bc23a..1b7f20a 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -5835,7 +5835,8 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
                 */
                DRM_DEBUG_DRIVER("No preferred mode found\n");
        } else {
-               recalculate_timing = is_freesync_video_mode(&mode, aconnector);
+               recalculate_timing = amdgpu_freesync_vid_mode &&
+                                is_freesync_video_mode(&mode, aconnector);
                if (recalculate_timing) {
                        freesync_mode = get_highest_refresh_rate_mode(aconnector, false);
                        drm_mode_copy(&saved_mode, &mode);
@@ -6986,7 +6987,7 @@ static void amdgpu_dm_connector_add_freesync_modes(struct drm_connector *connect
        struct amdgpu_dm_connector *amdgpu_dm_connector =
                to_amdgpu_dm_connector(connector);
 
-       if (!edid)
+       if (!(amdgpu_freesync_vid_mode && edid))
                return;
 
        if (amdgpu_dm_connector->max_vfreq - amdgpu_dm_connector->min_vfreq > 10)
@@ -8850,7 +8851,8 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
                 * TODO: Refactor this function to allow this check to work
                 * in all conditions.
                 */
-               if (dm_new_crtc_state->stream &&
+               if (amdgpu_freesync_vid_mode &&
+                   dm_new_crtc_state->stream &&
                    is_timing_unchanged_for_freesync(new_crtc_state, old_crtc_state))
                        goto skip_modeset;
 
@@ -8885,7 +8887,7 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
                if (!dm_old_crtc_state->stream)
                        goto skip_modeset;
 
-               if (dm_new_crtc_state->stream &&
+               if (amdgpu_freesync_vid_mode && dm_new_crtc_state->stream &&
                    is_timing_unchanged_for_freesync(new_crtc_state,
                                                     old_crtc_state)) {
                        new_crtc_state->mode_changed = false;
@@ -8897,7 +8899,7 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
                        set_freesync_fixed_config(dm_new_crtc_state);
 
                        goto skip_modeset;
-               } else if (aconnector &&
+               } else if (amdgpu_freesync_vid_mode && aconnector &&
                           is_freesync_video_mode(&new_crtc_state->mode,
                                                  aconnector)) {
                        struct drm_display_mode *high_mode;