drm/bridge: tc358775: Switch to atomic commit

The tc358775 driver follows the drm_encoder->crtc pointer that is
deprecated and shouldn't be used by atomic drivers.

Fortunately, the atomic hooks provide the drm_atomic_state and we can
access our current CRTC from that, going from the bridge to its encoder,
to its connector, and to its CRTC.

Let's convert this bridge driver to atomic so we can get rid of the
drm_encoder->crtc dereference.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250313-bridge-connector-v6-13-511c54a604fb@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>

1 files changed, 19 insertions, 23 deletions

diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
index 13cd48e77d2d..1b10e6ee1724 100644
--- a/drivers/gpu/drm/bridge/tc358775.c
+++ b/drivers/gpu/drm/bridge/tc358775.c
@@ -286,7 +286,8 @@ static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
 	return container_of(b, struct tc_data, bridge);
 }
 
-static void tc_bridge_pre_enable(struct drm_bridge *bridge)
+static void tc_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+					struct drm_atomic_state *state)
 {
 	struct tc_data *tc = bridge_to_tc(bridge);
 	struct device *dev = &tc->dsi->dev;
@@ -309,7 +310,8 @@ static void tc_bridge_pre_enable(struct drm_bridge *bridge)
 	usleep_range(10, 20);
 }
 
-static void tc_bridge_post_disable(struct drm_bridge *bridge)
+static void tc_bridge_atomic_post_disable(struct drm_bridge *bridge,
+					  struct drm_atomic_state *state)
 {
 	struct tc_data *tc = bridge_to_tc(bridge);
 	struct device *dev = &tc->dsi->dev;
@@ -368,30 +370,21 @@ static void d2l_write(struct i2c_client *i2c, u16 addr, u32 val)
 			ret, addr);
 }
 
-/* helper function to access bus_formats */
-static struct drm_connector *get_connector(struct drm_encoder *encoder)
-{
-	struct drm_device *dev = encoder->dev;
-	struct drm_connector *connector;
-
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
-		if (connector->encoder == encoder)
-			return connector;
-
-	return NULL;
-}
-
-static void tc_bridge_enable(struct drm_bridge *bridge)
+static void tc_bridge_atomic_enable(struct drm_bridge *bridge,
+				    struct drm_atomic_state *state)
 {
 	struct tc_data *tc = bridge_to_tc(bridge);
 	u32 hback_porch, hsync_len, hfront_porch, hactive, htime1, htime2;
 	u32 vback_porch, vsync_len, vfront_porch, vactive, vtime1, vtime2;
 	u32 val = 0;
 	u16 dsiclk, clkdiv, byteclk, t1, t2, t3, vsdelay;
-	struct drm_display_mode *mode;
-	struct drm_connector *connector = get_connector(bridge->encoder);
-
-	mode = &bridge->encoder->crtc->state->adjusted_mode;
+	struct drm_connector *connector =
+		drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
+	struct drm_connector_state *conn_state =
+		drm_atomic_get_new_connector_state(state, connector);
+	struct drm_crtc_state *crtc_state =
+		drm_atomic_get_new_crtc_state(state, conn_state->crtc);
+	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
 
 	hback_porch = mode->htotal - mode->hsync_end;
 	hsync_len  = mode->hsync_end - mode->hsync_start;
@@ -601,10 +594,13 @@ static int tc_bridge_attach(struct drm_bridge *bridge,
 
 static const struct drm_bridge_funcs tc_bridge_funcs = {
 	.attach = tc_bridge_attach,
-	.pre_enable = tc_bridge_pre_enable,
-	.enable = tc_bridge_enable,
+	.atomic_pre_enable = tc_bridge_atomic_pre_enable,
+	.atomic_enable = tc_bridge_atomic_enable,
 	.mode_valid = tc_mode_valid,
-	.post_disable = tc_bridge_post_disable,
+	.atomic_post_disable = tc_bridge_atomic_post_disable,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 };
 
 static int tc_attach_host(struct tc_data *tc)