drm: Replace 'format->format' comparisons to just 'format' comparisons

Rather than compare the format u32s of two format infos, we can direclty
compare the format info pointers themselves. Noramlly all the ->format
pointers all point to somwehere in the big array, so this is a valid
way to test for equality.

Also drivers may want to point ->format at a private format info struct
instead (eg. for special compressed formats with extra planes), so
just comparing the pixel format values wouldn't necessaritly even work.
But comparing the pointers will also take care of that case.

@@
struct drm_framebuffer *a;
struct drm_framebuffer *b;
@@
(
- a->format->format != b->format->format
+ a->format != b->format
|
- a->format->format == b->format->format
+ a->format == b->format
)

@@
struct drm_plane_state *a;
struct drm_plane_state *b;
@@
(
- a->fb->format->format != b->fb->format->format
+ a->fb->format != b->fb->format
|
- a->fb->format->format == b->fb->format->format
+ a->fb->format == b->fb->format
)

@@
struct drm_crtc *crtc;
struct drm_framebuffer *x;
@@
(
- crtc->primary->fb->format->format != x->format->format
+ crtc->primary->fb->format != x->format
|
- x->format->format != crtc->primary->fb->format->format
+ x->format != crtc->primary->fb->format
)

@@
struct drm_mode_set *set;
@@
- set->fb->format->format != set->crtc->primary->fb->format->format
+ set->fb->format != set->crtc->primary->fb->format

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1479498793-31021-35-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

drivers/gpu/drm/armada/armada_crtc.c

@@ -1035,7 +1035,7 @@ static int armada_drm_crtc_page_flip(struct drm_crtc *crtc,
 	int ret;
 
 	/* We don't support changing the pixel format */
-	if (fb->format->format != crtc->primary->fb->format->format)
+	if (fb->format != crtc->primary->fb->format)
 		return -EINVAL;
 
 	work = kmalloc(sizeof(*work), GFP_KERNEL);

drivers/gpu/drm/drm_crtc_helper.c

@@ -588,8 +588,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
 		if (set->crtc->primary->fb == NULL) {
 			DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
 			mode_changed = true;
-		} else if (set->fb->format->format !=
-			   set->crtc->primary->fb->format->format) {
+		} else if (set->fb->format != set->crtc->primary->fb->format) {
 			mode_changed = true;
 		} else
 			fb_changed = true;

drivers/gpu/drm/drm_plane.c

@@ -858,7 +858,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
 	if (ret)
 		goto out;
 
-	if (crtc->primary->fb->format->format != fb->format->format) {
+	if (crtc->primary->fb->format != fb->format) {
 		DRM_DEBUG_KMS("Page flip is not allowed to change frame buffer format.\n");
 		ret = -EINVAL;
 		goto out;

drivers/gpu/drm/i915/intel_display.c

@@ -12147,7 +12147,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 		return -EBUSY;
 
 	/* Can't change pixel format via MI display flips. */
-	if (fb->format->format != crtc->primary->fb->format->format)
+	if (fb->format != crtc->primary->fb->format)
 		return -EINVAL;
 
 	/*

drivers/gpu/drm/imx/ipuv3-plane.c

@@ -281,7 +281,7 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
 	 */
 	if (old_fb && (state->src_w != old_state->src_w ||
 			      state->src_h != old_state->src_h ||
-			      fb->format->format != old_fb->format->format))
+			      fb->format != old_fb->format))
 		crtc_state->mode_changed = true;
 
 	eba = drm_plane_state_to_eba(state);
@@ -315,7 +315,7 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
 		if (vbo & 0x7 || vbo > 0xfffff8)
 			return -EINVAL;
 
-		if (old_fb && (fb->format->format == old_fb->format->format)) {
+		if (old_fb && (fb->format == old_fb->format)) {
 			old_vbo = drm_plane_state_to_vbo(old_state);
 			if (vbo != old_vbo)
 				crtc_state->mode_changed = true;
@@ -332,7 +332,7 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
 		if (ubo & 0x7 || ubo > 0xfffff8)
 			return -EINVAL;
 
-		if (old_fb && (fb->format->format == old_fb->format->format)) {
+		if (old_fb && (fb->format == old_fb->format)) {
 			old_ubo = drm_plane_state_to_ubo(old_state);
 			if (ubo != old_ubo)
 				crtc_state->mode_changed = true;

drivers/gpu/drm/tilcdc/tilcdc_plane.c

@@ -77,7 +77,7 @@ static int tilcdc_plane_atomic_check(struct drm_plane *plane,
 	}
 
 	if (state->fb && old_state->fb &&
-	    state->fb->format->format != old_state->fb->format->format) {
+	    state->fb->format != old_state->fb->format) {
 		dev_dbg(plane->dev->dev,
 			"%s(): pixel format change requires mode_change\n",
 			__func__);