drm/bridge: chipone-icn6211: Add mode_set API

Get the display mode settings via mode_set bridge
function instead of explicitly de-reference.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211119145325.1775046-2-jagan@amarulasolutions.comReviewed-by: Robert Foss <robert.foss@linaro.org>

drivers/gpu/drm/bridge/chipone-icn6211.c

@@ -31,6 +31,7 @@
 struct chipone {
 	struct device *dev;
 	struct drm_bridge bridge;
+	struct drm_display_mode mode;
 	struct drm_bridge *panel_bridge;
 	struct gpio_desc *enable_gpio;
 	struct regulator *vdd1;
@@ -43,11 +44,6 @@ static inline struct chipone *bridge_to_chipone(struct drm_bridge *bridge)
 	return container_of(bridge, struct chipone, bridge);
 }
 
-static struct drm_display_mode *bridge_to_mode(struct drm_bridge *bridge)
-{
-	return &bridge->encoder->crtc->state->adjusted_mode;
-}
-
 static inline int chipone_dsi_write(struct chipone *icn,  const void *seq,
 				    size_t len)
 {
@@ -66,7 +62,7 @@ static void chipone_atomic_enable(struct drm_bridge *bridge,
 				  struct drm_bridge_state *old_bridge_state)
 {
 	struct chipone *icn = bridge_to_chipone(bridge);
-	struct drm_display_mode *mode = bridge_to_mode(bridge);
+	struct drm_display_mode *mode = &icn->mode;
 
 	ICN6211_DSI(icn, 0x7a, 0xc1);
 
@@ -165,6 +161,15 @@ static void chipone_atomic_post_disable(struct drm_bridge *bridge,
 	gpiod_set_value(icn->enable_gpio, 0);
 }
 
+static void chipone_mode_set(struct drm_bridge *bridge,
+			     const struct drm_display_mode *mode,
+			     const struct drm_display_mode *adjusted_mode)
+{
+	struct chipone *icn = bridge_to_chipone(bridge);
+
+	drm_mode_copy(&icn->mode, adjusted_mode);
+}
+
 static int chipone_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags)
 {
 	struct chipone *icn = bridge_to_chipone(bridge);
@@ -179,6 +184,7 @@ static const struct drm_bridge_funcs chipone_bridge_funcs = {
 	.atomic_pre_enable	= chipone_atomic_pre_enable,
 	.atomic_enable		= chipone_atomic_enable,
 	.atomic_post_disable	= chipone_atomic_post_disable,
+	.mode_set		= chipone_mode_set,
 	.attach			= chipone_attach,
 };