drm: Use state helper instead of CRTC state pointer

Many drivers reference the crtc->pointer in order to get the current CRTC
state in their atomic_begin or atomic_flush hooks, which would be the new
CRTC state in the global atomic state since _swap_state happened when those
hooks are run.

Use the drm_atomic_get_new_crtc_state helper to get that state to make it
more obvious.

This was made using the coccinelle script below:

@ crtc_atomic_func @
identifier helpers;
identifier func;
@@

(
static struct drm_crtc_helper_funcs helpers = {
	...,
	.atomic_begin = func,
	...,
};
|
static struct drm_crtc_helper_funcs helpers = {
	...,
	.atomic_flush = func,
	...,
};
)

@@
identifier crtc_atomic_func.func;
identifier crtc, state;
symbol crtc_state;
expression e;
@@

  func(struct drm_crtc *crtc, struct drm_atomic_state *state) {
  ...
- struct tegra_dc_state *crtc_state = e;
+ struct tegra_dc_state *dc_state = e;
  <+...
-       crtc_state
+	dc_state
  ...+>
  }

@@
identifier crtc_atomic_func.func;
identifier crtc, state;
symbol crtc_state;
expression e;
@@

  func(struct drm_crtc *crtc, struct drm_atomic_state *state) {
  ...
- struct mtk_crtc_state *crtc_state = e;
+ struct mtk_crtc_state *mtk_crtc_state = e;
  <+...
-       crtc_state
+	mtk_crtc_state
  ...+>
  }

@ replaces_new_state @
identifier crtc_atomic_func.func;
identifier crtc, state, crtc_state;
@@

  func(struct drm_crtc *crtc, struct drm_atomic_state *state) {
  ...
- struct drm_crtc_state *crtc_state = crtc->state;
+ struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
  ...
 }

@@
identifier crtc_atomic_func.func;
identifier crtc, state, crtc_state;
@@

  func(struct drm_crtc *crtc, struct drm_atomic_state *state) {
  struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
  ...
- crtc->state
+ crtc_state
  ...
 }

@ adds_new_state @
identifier crtc_atomic_func.func;
identifier crtc, state;
@@

  func(struct drm_crtc *crtc, struct drm_atomic_state *state) {
+ struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
  ...
- crtc->state
+ crtc_state
  ...
 }

@ include depends on adds_new_state || replaces_new_state @
@@

 #include <drm/drm_atomic.h>

@ no_include depends on !include && (adds_new_state || replaces_new_state) @
@@

+ #include <drm/drm_atomic.h>
  #include <drm/...>

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: "James (Qian) Wang" <james.qian.wang@arm.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Mihail Atanassov <mihail.atanassov@arm.com>
Cc: Brian Starkey <brian.starkey@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Paul Cercueil <paul@crapouillou.net>
Cc: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Sandy Huang <hjc@rock-chips.com>
Cc: "Heiko Stübner" <heiko@sntech.de>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201105164518.392891-1-maxime@cerno.tech

drivers/gpu/drm/arm/display/komeda/komeda_crtc.c

@@ -387,10 +387,12 @@ static void
 komeda_crtc_atomic_flush(struct drm_crtc *crtc,
 			 struct drm_atomic_state *state)
 {
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
 	struct drm_crtc_state *old = drm_atomic_get_old_crtc_state(state,
 								   crtc);
 	/* commit with modeset will be handled in enable/disable */
-	if (drm_atomic_crtc_needs_modeset(crtc->state))
+	if (drm_atomic_crtc_needs_modeset(crtc_state))
 		return;
 
 	komeda_crtc_do_flush(crtc, old);

drivers/gpu/drm/armada/armada_crtc.c

@@ -431,11 +431,13 @@ static int armada_drm_crtc_atomic_check(struct drm_crtc *crtc,
 static void armada_drm_crtc_atomic_begin(struct drm_crtc *crtc,
 					 struct drm_atomic_state *state)
 {
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
 	struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
 
 	DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
 
-	if (crtc->state->color_mgmt_changed)
+	if (crtc_state->color_mgmt_changed)
 		armada_drm_update_gamma(crtc);
 
 	dcrtc->regs_idx = 0;
@@ -445,6 +447,8 @@ static void armada_drm_crtc_atomic_begin(struct drm_crtc *crtc,
 static void armada_drm_crtc_atomic_flush(struct drm_crtc *crtc,
 					 struct drm_atomic_state *state)
 {
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
 	struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
 
 	DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
@@ -455,7 +459,7 @@ static void armada_drm_crtc_atomic_flush(struct drm_crtc *crtc,
 	 * If we aren't doing a full modeset, then we need to queue
 	 * the event here.
 	 */
-	if (!drm_atomic_crtc_needs_modeset(crtc->state)) {
+	if (!drm_atomic_crtc_needs_modeset(crtc_state)) {
 		dcrtc->update_pending = true;
 		armada_drm_crtc_queue_state_event(crtc);
 		spin_lock_irq(&dcrtc->irq_lock);

drivers/gpu/drm/ast/ast_mode.c

@@ -782,10 +782,12 @@ static void
 ast_crtc_helper_atomic_flush(struct drm_crtc *crtc,
 			     struct drm_atomic_state *state)
 {
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
 	struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
 									      crtc);
 	struct ast_private *ast = to_ast_private(crtc->dev);
-	struct ast_crtc_state *ast_crtc_state = to_ast_crtc_state(crtc->state);
+	struct ast_crtc_state *ast_crtc_state = to_ast_crtc_state(crtc_state);
 	struct ast_crtc_state *old_ast_crtc_state = to_ast_crtc_state(old_crtc_state);
 
 	/*

drivers/gpu/drm/ingenic/ingenic-drm-drv.c

@@ -305,11 +305,13 @@ ingenic_drm_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode
 static void ingenic_drm_crtc_atomic_begin(struct drm_crtc *crtc,
 					  struct drm_atomic_state *state)
 {
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
 	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
 	u32 ctrl = 0;
 
 	if (priv->soc_info->has_osd &&
-	    drm_atomic_crtc_needs_modeset(crtc->state)) {
+	    drm_atomic_crtc_needs_modeset(crtc_state)) {
 		/*
 		 * If IPU plane is enabled, enable IPU as source for the F1
 		 * plane; otherwise use regular DMA.
@@ -326,7 +328,8 @@ static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
 					  struct drm_atomic_state *state)
 {
 	struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
-	struct drm_crtc_state *crtc_state = crtc->state;
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
 	struct drm_pending_vblank_event *event = crtc_state->event;
 
 	if (drm_atomic_crtc_needs_modeset(crtc_state)) {

drivers/gpu/drm/mediatek/mtk_drm_crtc.c

@@ -11,6 +11,7 @@
 #include <asm/barrier.h>
 #include <soc/mediatek/smi.h>
 
+#include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
@@ -577,17 +578,19 @@ static void mtk_drm_crtc_atomic_disable(struct drm_crtc *crtc,
 static void mtk_drm_crtc_atomic_begin(struct drm_crtc *crtc,
 				      struct drm_atomic_state *state)
 {
-	struct mtk_crtc_state *crtc_state = to_mtk_crtc_state(crtc->state);
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
+	struct mtk_crtc_state *mtk_crtc_state = to_mtk_crtc_state(crtc_state);
 	struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 
-	if (mtk_crtc->event && crtc_state->base.event)
+	if (mtk_crtc->event && mtk_crtc_state->base.event)
 		DRM_ERROR("new event while there is still a pending event\n");
 
-	if (crtc_state->base.event) {
+	if (mtk_crtc_state->base.event) {
-		crtc_state->base.event->pipe = drm_crtc_index(crtc);
+		mtk_crtc_state->base.event->pipe = drm_crtc_index(crtc);
 		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
-		mtk_crtc->event = crtc_state->base.event;
+		mtk_crtc->event = mtk_crtc_state->base.event;
-		crtc_state->base.event = NULL;
+		mtk_crtc_state->base.event = NULL;
 	}
 }
 

drivers/gpu/drm/rockchip/rockchip_drm_vop.c

@@ -1248,6 +1248,8 @@ static void vop_crtc_gamma_set(struct vop *vop, struct drm_crtc *crtc,
 static void vop_crtc_atomic_begin(struct drm_crtc *crtc,
 				  struct drm_atomic_state *state)
 {
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
 	struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
 									      crtc);
 	struct vop *vop = to_vop(crtc);
@@ -1256,8 +1258,8 @@ static void vop_crtc_atomic_begin(struct drm_crtc *crtc,
 	 * Only update GAMMA if the 'active' flag is not changed,
 	 * otherwise it's updated by .atomic_enable.
 	 */
-	if (crtc->state->color_mgmt_changed &&
+	if (crtc_state->color_mgmt_changed &&
-	    !crtc->state->active_changed)
+	    !crtc_state->active_changed)
 		vop_crtc_gamma_set(vop, crtc, old_crtc_state);
 }
 

drivers/gpu/drm/tegra/dc.c

@@ -1939,15 +1939,17 @@ static void tegra_crtc_atomic_begin(struct drm_crtc *crtc,
 static void tegra_crtc_atomic_flush(struct drm_crtc *crtc,
 				    struct drm_atomic_state *state)
 {
-	struct tegra_dc_state *crtc_state = to_dc_state(crtc->state);
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
+	struct tegra_dc_state *dc_state = to_dc_state(crtc_state);
 	struct tegra_dc *dc = to_tegra_dc(crtc);
 	u32 value;
 
-	value = crtc_state->planes << 8 | GENERAL_UPDATE;
+	value = dc_state->planes << 8 | GENERAL_UPDATE;
 	tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
 	value = tegra_dc_readl(dc, DC_CMD_STATE_CONTROL);
 
-	value = crtc_state->planes | GENERAL_ACT_REQ;
+	value = dc_state->planes | GENERAL_ACT_REQ;
 	tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
 	value = tegra_dc_readl(dc, DC_CMD_STATE_CONTROL);
 }

drivers/gpu/drm/virtio/virtgpu_display.c

@@ -119,6 +119,8 @@ static int virtio_gpu_crtc_atomic_check(struct drm_crtc *crtc,
 static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
 					 struct drm_atomic_state *state)
 {
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+									  crtc);
 	struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
 
 	/*
@@ -127,7 +129,7 @@ static void virtio_gpu_crtc_atomic_flush(struct drm_crtc *crtc,
 	 * in the plane update callback, and here we just check
 	 * whenever we must force the modeset.
 	 */
-	if (drm_atomic_crtc_needs_modeset(crtc->state)) {
+	if (drm_atomic_crtc_needs_modeset(crtc_state)) {
 		output->needs_modeset = true;
 	}
 }