drm/amd/display: Move connector debugfs to drm

As drm_connector already have the display_info, instead of creating
"output_bpc" debugfs in vendor specific driver, move the logic to
the drm layer.

This patch will also move "Current" bpc to the crtc debugfs from
connector debugfs, since we are getting this info from crtc_state.

Cc: Harry Wentland <[e-mail]>
Cc: Rodrigo Siqueira <[e-mail]>
Signed-off-by: Bhanuprakash Modem <[e-mail]>
Reported-by: kernel test robot <[e-mail]>
Reviewed-by: Arun R Murthy <[e-mail]>
Reviewed-by: Harry Wentland <[e-mail]>
Acked-by: Harry Wentland <[e-mail]>
Signed-off-by: Jani Nikula <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

···
 	return &state->base;
 }
 
-#ifdef CONFIG_DRM_AMD_SECURE_DISPLAY
 static int amdgpu_dm_crtc_late_register(struct drm_crtc *crtc)
 {
 	crtc_debugfs_init(crtc);
 
 	return 0;
 }
-#endif
 
 static inline int dm_set_vupdate_irq(struct drm_crtc *crtc, bool enable)
 {
···
 	.enable_vblank = dm_enable_vblank,
 	.disable_vblank = dm_disable_vblank,
 	.get_vblank_timestamp = drm_crtc_vblank_helper_get_vblank_timestamp,
-#if defined(CONFIG_DRM_AMD_SECURE_DISPLAY)
 	.late_register = amdgpu_dm_crtc_late_register,
-#endif
 };
 
 static enum drm_connector_status

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c

···
 }
 
 /*
- * Returns the current and maximum output bpc for the connector.
- * Example usage: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
+ * Returns the current bpc for the crtc.
+ * Example usage: cat /sys/kernel/debug/dri/0/crtc-0/amdgpu_current_bpc
  */
-static int output_bpc_show(struct seq_file *m, void *data)
+static int amdgpu_current_bpc_show(struct seq_file *m, void *data)
 {
-	struct drm_connector *connector = m->private;
-	struct drm_device *dev = connector->dev;
-	struct drm_crtc *crtc = NULL;
+	struct drm_crtc *crtc = m->private;
+	struct drm_device *dev = crtc->dev;
 	struct dm_crtc_state *dm_crtc_state = NULL;
 	int res = -ENODEV;
 	unsigned int bpc;
 
 	mutex_lock(&dev->mode_config.mutex);
-	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
-
-	if (connector->state == NULL)
-		goto unlock;
-
-	crtc = connector->state->crtc;
-	if (crtc == NULL)
-		goto unlock;
-
 	drm_modeset_lock(&crtc->mutex, NULL);
 	if (crtc->state == NULL)
 		goto unlock;
···
 	}
 
 	seq_printf(m, "Current: %u\n", bpc);
-	seq_printf(m, "Maximum: %u\n", connector->display_info.bpc);
 	res = 0;
 
 unlock:
-	if (crtc)
-		drm_modeset_unlock(&crtc->mutex);
-
-	drm_modeset_unlock(&dev->mode_config.connection_mutex);
+	drm_modeset_unlock(&crtc->mutex);
 	mutex_unlock(&dev->mode_config.mutex);
 
 	return res;
 }
+DEFINE_SHOW_ATTRIBUTE(amdgpu_current_bpc);
 
 /*
  * Example usage:
···
 DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support);
 DEFINE_SHOW_ATTRIBUTE(dmub_fw_state);
 DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer);
-DEFINE_SHOW_ATTRIBUTE(output_bpc);
 DEFINE_SHOW_ATTRIBUTE(dp_lttpr_status);
 #ifdef CONFIG_DRM_AMD_DC_HDCP
 DEFINE_SHOW_ATTRIBUTE(hdcp_sink_capability);
···
 	const struct file_operations *fops;
 } connector_debugfs_entries[] = {
 		{"force_yuv420_output", &force_yuv420_output_fops},
-		{"output_bpc", &output_bpc_fops},
 		{"trigger_hotplug", &trigger_hotplug_debugfs_fops},
 		{"internal_display", &internal_display_fops}
 };
···
 
 DEFINE_DEBUGFS_ATTRIBUTE(crc_win_update_fops, crc_win_update_get,
 			 crc_win_update_set, "%llu\n");
-
+#endif
 void crtc_debugfs_init(struct drm_crtc *crtc)
 {
+#ifdef CONFIG_DRM_AMD_SECURE_DISPLAY
 	struct dentry *dir = debugfs_lookup("crc", crtc->debugfs_entry);
 
 	if (!dir)
···
 				   &crc_win_y_end_fops);
 	debugfs_create_file_unsafe("crc_win_update", 0644, dir, crtc,
 				   &crc_win_update_fops);
-
-}
 #endif
+	debugfs_create_file("amdgpu_current_bpc", 0644, crtc->debugfs_entry,
+			    crtc, &amdgpu_current_bpc_fops);
+}
+
 /*
  * Writes DTN log state to the user supplied buffer.
  * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.h

···
 
 void connector_debugfs_init(struct amdgpu_dm_connector *connector);
 void dtn_debugfs_init(struct amdgpu_device *adev);
-#if defined(CONFIG_DRM_AMD_SECURE_DISPLAY)
 void crtc_debugfs_init(struct drm_crtc *crtc);
-#endif
 
 #endif