Revert "drm/fbdev: Fallback to non tiled mode if all tiles not present"

This reverts commit f25c7a00 ("drm/fbdev: Fallback to non tiled mode
if all tiles not present"). The commit causes flip done timeouts in CI.

Below are the sample errors thrown in logs:

[IGT] core_getversion: executing
[IGT] core_getversion: exiting, ret=0
Setting dangerous option reset - tainting kernel
drm:drm_atomic_helper_wait_for_dependencies] ERROR [CRTC:152:pipe B] flip_done timed out
drm:drm_atomic_helper_wait_for_dependencies] ERROR [CONNECTOR:299:DP-2] flip_done timed out
drm:drm_atomic_helper_wait_for_dependencies] ERROR [PLANE:92:plane 1B] flip_done timed out
[drm:drm_atomic_helper_wait_for_flip_done] ERROR [CRTC:152:pipe B] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies] ERROR [CRTC:152:pipe B] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies] ERROR [CONNECTOR:299:DP-2] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies] ERROR [PLANE:92:plane 1B] flip_done timed out
[drm:drm_atomic_helper_wait_for_flip_done] ERROR [CRTC:152:pipe B] flip_done timed out
Console: switching to colour frame buffer device 480x135
[drm:drm_atomic_helper_wait_for_dependencies] ERROR [CRTC:152:pipe B] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies] ERROR [CONNECTOR:299:DP-2] flip_done timed out

Reverting the change for now to unblock CI execution.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Fixes: f25c7a00 ("drm/fbdev: Fallback to non tiled mode if all tiles not present")
Closes: https://gitlab.freedesktop.org/drm/intel/issues/6Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191123091840.32382-1-uma.shankar@intel.com

drivers/gpu/drm/drm_client_modeset.c

@@ -114,33 +114,6 @@ drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
 	return NULL;
 }
 
-static struct drm_display_mode *
-drm_connector_get_tiled_mode(struct drm_connector *connector)
-{
-	struct drm_display_mode *mode;
-
-	list_for_each_entry(mode, &connector->modes, head) {
-		if (mode->hdisplay == connector->tile_h_size &&
-		    mode->vdisplay == connector->tile_v_size)
-			return mode;
-	}
-	return NULL;
-}
-
-static struct drm_display_mode *
-drm_connector_fallback_non_tiled_mode(struct drm_connector *connector)
-{
-	struct drm_display_mode *mode;
-
-	list_for_each_entry(mode, &connector->modes, head) {
-		if (mode->hdisplay == connector->tile_h_size &&
-		    mode->vdisplay == connector->tile_v_size)
-			continue;
-		return mode;
-	}
-	return NULL;
-}
-
 static struct drm_display_mode *
 drm_connector_has_preferred_mode(struct drm_connector *connector, int width, int height)
 {
@@ -375,14 +348,8 @@ static bool drm_client_target_preferred(struct drm_connector **connectors,
 	struct drm_connector *connector;
 	u64 conn_configured = 0;
 	int tile_pass = 0;
-	int num_tiled_conns = 0;
 	int i;
 
-	for (i = 0; i < connector_count; i++) {
-		if (connectors[i]->has_tile)
-			num_tiled_conns++;
-	}
-
 retry:
 	for (i = 0; i < connector_count; i++) {
 		connector = connectors[i];
@@ -432,28 +399,6 @@ static bool drm_client_target_preferred(struct drm_connector **connectors,
 			list_for_each_entry(modes[i], &connector->modes, head)
 				break;
 		}
-		/*
-		 * In case of tiled mode if all tiles not present fallback to
-		 * first available non tiled mode.
-		 * After all tiles are present, try to find the tiled mode
-		 * for all and if tiled mode not present due to fbcon size
-		 * limitations, use first non tiled mode only for
-		 * tile 0,0 and set to no mode for all other tiles.
-		 */
-		if (connector->has_tile) {
-			if (num_tiled_conns <
-			    connector->num_h_tile * connector->num_v_tile ||
-			    (connector->tile_h_loc == 0 &&
-			     connector->tile_v_loc == 0 &&
-			     !drm_connector_get_tiled_mode(connector))) {
-				DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n",
-					      connector->base.id);
-				modes[i] = drm_connector_fallback_non_tiled_mode(connector);
-			} else {
-				modes[i] = drm_connector_get_tiled_mode(connector);
-			}
-		}
-
 		DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
 			  "none");
 		conn_configured |= BIT_ULL(i);
@@ -570,7 +515,6 @@ static bool drm_client_firmware_config(struct drm_client_dev *client,
 	bool fallback = true, ret = true;
 	int num_connectors_enabled = 0;
 	int num_connectors_detected = 0;
-	int num_tiled_conns = 0;
 	struct drm_modeset_acquire_ctx ctx;
 
 	if (!drm_drv_uses_atomic_modeset(dev))
@@ -588,10 +532,6 @@ static bool drm_client_firmware_config(struct drm_client_dev *client,
 	memcpy(save_enabled, enabled, count);
 	mask = GENMASK(count - 1, 0);
 	conn_configured = 0;
-	for (i = 0; i < count; i++) {
-		if (connectors[i]->has_tile)
-			num_tiled_conns++;
-	}
 retry:
 	conn_seq = conn_configured;
 	for (i = 0; i < count; i++) {
@@ -691,16 +631,6 @@ static bool drm_client_firmware_config(struct drm_client_dev *client,
 				      connector->name);
 			modes[i] = &connector->state->crtc->mode;
 		}
-		/*
-		 * In case of tiled modes, if all tiles are not present
-		 * then fallback to a non tiled mode.
-		 */
-		if (connector->has_tile &&
-		    num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
-			DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n",
-				      connector->base.id);
-			modes[i] = drm_connector_fallback_non_tiled_mode(connector);
-		}
 		crtcs[i] = new_crtc;
 
 		DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",