1 files changed, 58 insertions, 70 deletions

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index ba1160ec6d6e..945f08de45f1 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -245,47 +245,9 @@ static int sn65dsi83_attach(struct drm_bridge *bridge,
 			    enum drm_bridge_attach_flags flags)
 {
 	struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
-	struct device *dev = ctx->dev;
-	struct mipi_dsi_device *dsi;
-	struct mipi_dsi_host *host;
-	int ret = 0;
-
-	const struct mipi_dsi_device_info info = {
-		.type = "sn65dsi83",
-		.channel = 0,
-		.node = NULL,
-	};
-
-	host = of_find_mipi_dsi_host_by_node(ctx->host_node);
-	if (!host) {
-		dev_err(dev, "failed to find dsi host\n");
-		return -EPROBE_DEFER;
-	}
-
-	dsi = mipi_dsi_device_register_full(host, &info);
-	if (IS_ERR(dsi)) {
-		return dev_err_probe(dev, PTR_ERR(dsi),
-				     "failed to create dsi device\n");
-	}
-
-	ctx->dsi = dsi;
-
-	dsi->lanes = ctx->dsi_lanes;
-	dsi->format = MIPI_DSI_FMT_RGB888;
-	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
-
-	ret = mipi_dsi_attach(dsi);
-	if (ret < 0) {
-		dev_err(dev, "failed to attach dsi to host\n");
-		goto err_dsi_attach;
-	}
 
 	return drm_bridge_attach(bridge->encoder, ctx->panel_bridge,
 				 &ctx->bridge, flags);
-
-err_dsi_attach:
-	mipi_dsi_device_unregister(dsi);
-	return ret;
 }
 
 static void sn65dsi83_detach(struct drm_bridge *bridge)
@@ -295,28 +257,9 @@ static void sn65dsi83_detach(struct drm_bridge *bridge)
 	if (!ctx->dsi)
 		return;
 
-	mipi_dsi_detach(ctx->dsi);
-	mipi_dsi_device_unregister(ctx->dsi);
-	drm_bridge_remove(&ctx->bridge);
 	ctx->dsi = NULL;
 }
 
-static void sn65dsi83_atomic_pre_enable(struct drm_bridge *bridge,
-					struct drm_bridge_state *old_bridge_state)
-{
-	struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
-
-	/*
-	 * Reset the chip, pull EN line low for t_reset=10ms,
-	 * then high for t_en=1ms.
-	 */
-	regcache_mark_dirty(ctx->regmap);
-	gpiod_set_value(ctx->enable_gpio, 0);
-	usleep_range(10000, 11000);
-	gpiod_set_value(ctx->enable_gpio, 1);
-	usleep_range(1000, 1100);
-}
-
 static u8 sn65dsi83_get_lvds_range(struct sn65dsi83 *ctx,
 				   const struct drm_display_mode *mode)
 {
@@ -394,6 +337,10 @@ static void sn65dsi83_atomic_enable(struct drm_bridge *bridge,
 	u16 val;
 	int ret;
 
+	/* Deassert reset */
+	gpiod_set_value(ctx->enable_gpio, 1);
+	usleep_range(1000, 1100);
+
 	/* Get the LVDS format from the bridge state. */
 	bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
 
@@ -540,18 +487,11 @@ static void sn65dsi83_atomic_disable(struct drm_bridge *bridge,
 {
 	struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
 
-	/* Clear reset, disable PLL */
-	regmap_write(ctx->regmap, REG_RC_RESET, 0x00);
-	regmap_write(ctx->regmap, REG_RC_PLL_EN, 0x00);
-}
-
-static void sn65dsi83_atomic_post_disable(struct drm_bridge *bridge,
-					  struct drm_bridge_state *old_bridge_state)
-{
-	struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
-
-	/* Put the chip in reset, pull EN line low. */
+	/* Put the chip in reset, pull EN line low, and assure 10ms reset low timing. */
 	gpiod_set_value(ctx->enable_gpio, 0);
+	usleep_range(10000, 11000);
+
+	regcache_mark_dirty(ctx->regmap);
 }
 
 static enum drm_mode_status
@@ -597,10 +537,8 @@ sn65dsi83_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 static const struct drm_bridge_funcs sn65dsi83_funcs = {
 	.attach			= sn65dsi83_attach,
 	.detach			= sn65dsi83_detach,
-	.atomic_pre_enable	= sn65dsi83_atomic_pre_enable,
 	.atomic_enable		= sn65dsi83_atomic_enable,
 	.atomic_disable		= sn65dsi83_atomic_disable,
-	.atomic_post_disable	= sn65dsi83_atomic_post_disable,
 	.mode_valid		= sn65dsi83_mode_valid,
 
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
@@ -664,6 +602,44 @@ static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model)
 	return 0;
 }
 
+static int sn65dsi83_host_attach(struct sn65dsi83 *ctx)
+{
+	struct device *dev = ctx->dev;
+	struct mipi_dsi_device *dsi;
+	struct mipi_dsi_host *host;
+	const struct mipi_dsi_device_info info = {
+		.type = "sn65dsi83",
+		.channel = 0,
+		.node = NULL,
+	};
+	int ret;
+
+	host = of_find_mipi_dsi_host_by_node(ctx->host_node);
+	if (!host) {
+		dev_err(dev, "failed to find dsi host\n");
+		return -EPROBE_DEFER;
+	}
+
+	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
+	if (IS_ERR(dsi))
+		return dev_err_probe(dev, PTR_ERR(dsi),
+				     "failed to create dsi device\n");
+
+	ctx->dsi = dsi;
+
+	dsi->lanes = ctx->dsi_lanes;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
+
+	ret = devm_mipi_dsi_attach(dev, dsi);
+	if (ret < 0) {
+		dev_err(dev, "failed to attach dsi to host: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 static int sn65dsi83_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
@@ -685,10 +661,13 @@ static int sn65dsi83_probe(struct i2c_client *client,
 		model = id->driver_data;
 	}
 
+	/* Put the chip in reset, pull EN line low, and assure 10ms reset low timing. */
 	ctx->enable_gpio = devm_gpiod_get(ctx->dev, "enable", GPIOD_OUT_LOW);
 	if (IS_ERR(ctx->enable_gpio))
 		return PTR_ERR(ctx->enable_gpio);
 
+	usleep_range(10000, 11000);
+
 	ret = sn65dsi83_parse_dt(ctx, model);
 	if (ret)
 		return ret;
@@ -704,13 +683,22 @@ static int sn65dsi83_probe(struct i2c_client *client,
 	ctx->bridge.of_node = dev->of_node;
 	drm_bridge_add(&ctx->bridge);
 
+	ret = sn65dsi83_host_attach(ctx);
+	if (ret)
+		goto err_remove_bridge;
+
 	return 0;
+
+err_remove_bridge:
+	drm_bridge_remove(&ctx->bridge);
+	return ret;
 }
 
 static int sn65dsi83_remove(struct i2c_client *client)
 {
 	struct sn65dsi83 *ctx = i2c_get_clientdata(client);
 
+	drm_bridge_remove(&ctx->bridge);
 	of_node_put(ctx->host_node);
 
 	return 0;