drm/tegra: sor: Operate on struct drm_dp_aux *

Instead of getting a pointer to the driver-specific wrapper of AUX
channels, use the AUX channel objects directly to avoid hackish casting
between the two types.
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/dpaux.c

@@ -436,7 +436,7 @@ struct platform_driver tegra_dpaux_driver = {
 	.remove = tegra_dpaux_remove,
 };
 
-struct tegra_dpaux *tegra_dpaux_find_by_of_node(struct device_node *np)
+struct drm_dp_aux *drm_dp_aux_find_by_of_node(struct device_node *np)
 {
 	struct tegra_dpaux *dpaux;
 
@@ -445,7 +445,7 @@ struct tegra_dpaux *tegra_dpaux_find_by_of_node(struct device_node *np)
 	list_for_each_entry(dpaux, &dpaux_list, list)
 		if (np == dpaux->dev->of_node) {
 			mutex_unlock(&dpaux_lock);
-			return dpaux;
+			return &dpaux->aux;
 		}
 
 	mutex_unlock(&dpaux_lock);
@@ -453,8 +453,9 @@ struct tegra_dpaux *tegra_dpaux_find_by_of_node(struct device_node *np)
 	return NULL;
 }
 
-int tegra_dpaux_attach(struct tegra_dpaux *dpaux, struct tegra_output *output)
+int drm_dp_aux_attach(struct drm_dp_aux *aux, struct tegra_output *output)
 {
+	struct tegra_dpaux *dpaux = to_dpaux(aux);
 	unsigned long timeout;
 	int err;
 
@@ -470,7 +471,7 @@ int tegra_dpaux_attach(struct tegra_dpaux *dpaux, struct tegra_output *output)
 	while (time_before(jiffies, timeout)) {
 		enum drm_connector_status status;
 
-		status = tegra_dpaux_detect(dpaux);
+		status = drm_dp_aux_detect(aux);
 		if (status == connector_status_connected) {
 			enable_irq(dpaux->irq);
 			return 0;
@@ -482,8 +483,9 @@ int tegra_dpaux_attach(struct tegra_dpaux *dpaux, struct tegra_output *output)
 	return -ETIMEDOUT;
 }
 
-int tegra_dpaux_detach(struct tegra_dpaux *dpaux)
+int drm_dp_aux_detach(struct drm_dp_aux *aux)
 {
+	struct tegra_dpaux *dpaux = to_dpaux(aux);
 	unsigned long timeout;
 	int err;
 
@@ -498,7 +500,7 @@ int tegra_dpaux_detach(struct tegra_dpaux *dpaux)
 	while (time_before(jiffies, timeout)) {
 		enum drm_connector_status status;
 
-		status = tegra_dpaux_detect(dpaux);
+		status = drm_dp_aux_detect(aux);
 		if (status == connector_status_disconnected) {
 			dpaux->output = NULL;
 			return 0;
@@ -510,8 +512,9 @@ int tegra_dpaux_detach(struct tegra_dpaux *dpaux)
 	return -ETIMEDOUT;
 }
 
-enum drm_connector_status tegra_dpaux_detect(struct tegra_dpaux *dpaux)
+enum drm_connector_status drm_dp_aux_detect(struct drm_dp_aux *aux)
 {
+	struct tegra_dpaux *dpaux = to_dpaux(aux);
 	u32 value;
 
 	value = tegra_dpaux_readl(dpaux, DPAUX_DP_AUXSTAT);
@@ -522,8 +525,9 @@ enum drm_connector_status tegra_dpaux_detect(struct tegra_dpaux *dpaux)
 	return connector_status_disconnected;
 }
 
-int tegra_dpaux_enable(struct tegra_dpaux *dpaux)
+int drm_dp_aux_enable(struct drm_dp_aux *aux)
 {
+	struct tegra_dpaux *dpaux = to_dpaux(aux);
 	u32 value;
 
 	value = DPAUX_HYBRID_PADCTL_AUX_CMH(2) |
@@ -540,8 +544,9 @@ int tegra_dpaux_enable(struct tegra_dpaux *dpaux)
 	return 0;
 }
 
-int tegra_dpaux_disable(struct tegra_dpaux *dpaux)
+int drm_dp_aux_disable(struct drm_dp_aux *aux)
 {
+	struct tegra_dpaux *dpaux = to_dpaux(aux);
 	u32 value;
 
 	value = tegra_dpaux_readl(dpaux, DPAUX_HYBRID_SPARE);
@@ -551,11 +556,11 @@ int tegra_dpaux_disable(struct tegra_dpaux *dpaux)
 	return 0;
 }
 
-int tegra_dpaux_prepare(struct tegra_dpaux *dpaux, u8 encoding)
+int drm_dp_aux_prepare(struct drm_dp_aux *aux, u8 encoding)
 {
 	int err;
 
-	err = drm_dp_dpcd_writeb(&dpaux->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
+	err = drm_dp_dpcd_writeb(aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
 				 encoding);
 	if (err < 0)
 		return err;
@@ -563,15 +568,15 @@ int tegra_dpaux_prepare(struct tegra_dpaux *dpaux, u8 encoding)
 	return 0;
 }
 
-int tegra_dpaux_train(struct tegra_dpaux *dpaux, struct drm_dp_link *link,
-		      u8 pattern)
+int drm_dp_aux_train(struct drm_dp_aux *aux, struct drm_dp_link *link,
+		     u8 pattern)
 {
 	u8 tp = pattern & DP_TRAINING_PATTERN_MASK;
 	u8 status[DP_LINK_STATUS_SIZE], values[4];
 	unsigned int i;
 	int err;
 
-	err = drm_dp_dpcd_writeb(&dpaux->aux, DP_TRAINING_PATTERN_SET, pattern);
+	err = drm_dp_dpcd_writeb(aux, DP_TRAINING_PATTERN_SET, pattern);
 	if (err < 0)
 		return err;
 
@@ -584,14 +589,14 @@ int tegra_dpaux_train(struct tegra_dpaux *dpaux, struct drm_dp_link *link,
 			    DP_TRAIN_MAX_SWING_REACHED |
 			    DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
 
-	err = drm_dp_dpcd_write(&dpaux->aux, DP_TRAINING_LANE0_SET, values,
+	err = drm_dp_dpcd_write(aux, DP_TRAINING_LANE0_SET, values,
 				link->num_lanes);
 	if (err < 0)
 		return err;
 
 	usleep_range(500, 1000);
 
-	err = drm_dp_dpcd_read_link_status(&dpaux->aux, status);
+	err = drm_dp_dpcd_read_link_status(aux, status);
 	if (err < 0)
 		return err;
 
@@ -609,11 +614,11 @@ int tegra_dpaux_train(struct tegra_dpaux *dpaux, struct drm_dp_link *link,
 		break;
 
 	default:
-		dev_err(dpaux->dev, "unsupported training pattern %u\n", tp);
+		dev_err(aux->dev, "unsupported training pattern %u\n", tp);
 		return -EINVAL;
 	}
 
-	err = drm_dp_dpcd_writeb(&dpaux->aux, DP_EDP_CONFIGURATION_SET, 0);
+	err = drm_dp_dpcd_writeb(aux, DP_EDP_CONFIGURATION_SET, 0);
 	if (err < 0)
 		return err;
 

drivers/gpu/drm/tegra/drm.h

@@ -247,18 +247,17 @@ void tegra_output_connector_destroy(struct drm_connector *connector);
 void tegra_output_encoder_destroy(struct drm_encoder *encoder);
 
 /* from dpaux.c */
-struct tegra_dpaux;
 struct drm_dp_link;
 
-struct tegra_dpaux *tegra_dpaux_find_by_of_node(struct device_node *np);
-enum drm_connector_status tegra_dpaux_detect(struct tegra_dpaux *dpaux);
-int tegra_dpaux_attach(struct tegra_dpaux *dpaux, struct tegra_output *output);
-int tegra_dpaux_detach(struct tegra_dpaux *dpaux);
-int tegra_dpaux_enable(struct tegra_dpaux *dpaux);
-int tegra_dpaux_disable(struct tegra_dpaux *dpaux);
-int tegra_dpaux_prepare(struct tegra_dpaux *dpaux, u8 encoding);
-int tegra_dpaux_train(struct tegra_dpaux *dpaux, struct drm_dp_link *link,
-		      u8 pattern);
+struct drm_dp_aux *drm_dp_aux_find_by_of_node(struct device_node *np);
+enum drm_connector_status drm_dp_aux_detect(struct drm_dp_aux *aux);
+int drm_dp_aux_attach(struct drm_dp_aux *aux, struct tegra_output *output);
+int drm_dp_aux_detach(struct drm_dp_aux *aux);
+int drm_dp_aux_enable(struct drm_dp_aux *aux);
+int drm_dp_aux_disable(struct drm_dp_aux *aux);
+int drm_dp_aux_prepare(struct drm_dp_aux *aux, u8 encoding);
+int drm_dp_aux_train(struct drm_dp_aux *aux, struct drm_dp_link *link,
+		     u8 pattern);
 
 /* from fb.c */
 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,

drivers/gpu/drm/tegra/sor.c

@@ -173,7 +173,7 @@ struct tegra_sor {
 	struct clk *clk_dp;
 	struct clk *clk;
 
-	struct tegra_dpaux *dpaux;
+	struct drm_dp_aux *aux;
 
 	struct drm_info_list *debugfs_files;
 	struct drm_minor *minor;
@@ -273,7 +273,7 @@ static int tegra_sor_dp_train_fast(struct tegra_sor *sor,
 		   SOR_DP_PADCTL_CM_TXD_1 | SOR_DP_PADCTL_CM_TXD_0);
 	tegra_sor_writel(sor, value, SOR_DP_PADCTL0);
 
-	err = tegra_dpaux_prepare(sor->dpaux, DP_SET_ANSI_8B10B);
+	err = drm_dp_aux_prepare(sor->aux, DP_SET_ANSI_8B10B);
 	if (err < 0)
 		return err;
 
@@ -288,7 +288,7 @@ static int tegra_sor_dp_train_fast(struct tegra_sor *sor,
 
 	pattern = DP_TRAINING_PATTERN_1;
 
-	err = tegra_dpaux_train(sor->dpaux, link, pattern);
+	err = drm_dp_aux_train(sor->aux, link, pattern);
 	if (err < 0)
 		return err;
 
@@ -309,7 +309,7 @@ static int tegra_sor_dp_train_fast(struct tegra_sor *sor,
 
 	pattern = DP_LINK_SCRAMBLING_DISABLE | DP_TRAINING_PATTERN_2;
 
-	err = tegra_dpaux_train(sor->dpaux, link, pattern);
+	err = drm_dp_aux_train(sor->aux, link, pattern);
 	if (err < 0)
 		return err;
 
@@ -324,7 +324,7 @@ static int tegra_sor_dp_train_fast(struct tegra_sor *sor,
 
 	pattern = DP_TRAINING_PATTERN_DISABLE;
 
-	err = tegra_dpaux_train(sor->dpaux, link, pattern);
+	err = drm_dp_aux_train(sor->aux, link, pattern);
 	if (err < 0)
 		return err;
 
@@ -1044,8 +1044,8 @@ tegra_sor_connector_detect(struct drm_connector *connector, bool force)
 	struct tegra_output *output = connector_to_output(connector);
 	struct tegra_sor *sor = to_sor(output);
 
-	if (sor->dpaux)
-		return tegra_dpaux_detect(sor->dpaux);
+	if (sor->aux)
+		return drm_dp_aux_detect(sor->aux);
 
 	return tegra_output_connector_detect(connector, force);
 }
@@ -1066,13 +1066,13 @@ static int tegra_sor_connector_get_modes(struct drm_connector *connector)
 	struct tegra_sor *sor = to_sor(output);
 	int err;
 
-	if (sor->dpaux)
-		tegra_dpaux_enable(sor->dpaux);
+	if (sor->aux)
+		drm_dp_aux_enable(sor->aux);
 
 	err = tegra_output_connector_get_modes(connector);
 
-	if (sor->dpaux)
-		tegra_dpaux_disable(sor->dpaux);
+	if (sor->aux)
+		drm_dp_aux_disable(sor->aux);
 
 	return err;
 }
@@ -1128,8 +1128,8 @@ static void tegra_sor_edp_disable(struct drm_encoder *encoder)
 	if (err < 0)
 		dev_err(sor->dev, "failed to power down SOR: %d\n", err);
 
-	if (sor->dpaux) {
-		err = tegra_dpaux_disable(sor->dpaux);
+	if (sor->aux) {
+		err = drm_dp_aux_disable(sor->aux);
 		if (err < 0)
 			dev_err(sor->dev, "failed to disable DP: %d\n", err);
 	}
@@ -1196,7 +1196,6 @@ static void tegra_sor_edp_enable(struct drm_encoder *encoder)
 	struct tegra_sor *sor = to_sor(output);
 	struct tegra_sor_config config;
 	struct drm_dp_link link;
-	struct drm_dp_aux *aux;
 	int err = 0;
 	u32 value;
 
@@ -1209,15 +1208,12 @@ static void tegra_sor_edp_enable(struct drm_encoder *encoder)
 	if (output->panel)
 		drm_panel_prepare(output->panel);
 
-	/* FIXME: properly convert to struct drm_dp_aux */
-	aux = (struct drm_dp_aux *)sor->dpaux;
-
-	if (sor->dpaux) {
-		err = tegra_dpaux_enable(sor->dpaux);
+	if (sor->aux) {
+		err = drm_dp_aux_enable(sor->aux);
 		if (err < 0)
 			dev_err(sor->dev, "failed to enable DP: %d\n", err);
 
-		err = drm_dp_link_probe(aux, &link);
+		err = drm_dp_link_probe(sor->aux, &link);
 		if (err < 0) {
 			dev_err(sor->dev, "failed to probe eDP link: %d\n",
 				err);
@@ -1434,20 +1430,20 @@ static void tegra_sor_edp_enable(struct drm_encoder *encoder)
 	value |= SOR_DP_PADCTL_PAD_CAL_PD;
 	tegra_sor_writel(sor, value, SOR_DP_PADCTL0);
 
-	if (sor->dpaux) {
+	if (sor->aux) {
 		u8 rate, lanes;
 
-		err = drm_dp_link_probe(aux, &link);
+		err = drm_dp_link_probe(sor->aux, &link);
 		if (err < 0)
 			dev_err(sor->dev, "failed to probe eDP link: %d\n",
 				err);
 
-		err = drm_dp_link_power_up(aux, &link);
+		err = drm_dp_link_power_up(sor->aux, &link);
 		if (err < 0)
 			dev_err(sor->dev, "failed to power up eDP link: %d\n",
 				err);
 
-		err = drm_dp_link_configure(aux, &link);
+		err = drm_dp_link_configure(sor->aux, &link);
 		if (err < 0)
 			dev_err(sor->dev, "failed to configure eDP link: %d\n",
 				err);
@@ -2148,7 +2144,7 @@ static int tegra_sor_init(struct host1x_client *client)
 	int encoder = DRM_MODE_ENCODER_NONE;
 	int err;
 
-	if (!sor->dpaux) {
+	if (!sor->aux) {
 		if (sor->soc->supports_hdmi) {
 			connector = DRM_MODE_CONNECTOR_HDMIA;
 			encoder = DRM_MODE_ENCODER_TMDS;
@@ -2199,8 +2195,8 @@ static int tegra_sor_init(struct host1x_client *client)
 			dev_err(sor->dev, "debugfs setup failed: %d\n", err);
 	}
 
-	if (sor->dpaux) {
-		err = tegra_dpaux_attach(sor->dpaux, &sor->output);
+	if (sor->aux) {
+		err = drm_dp_aux_attach(sor->aux, &sor->output);
 		if (err < 0) {
 			dev_err(sor->dev, "failed to attach DP: %d\n", err);
 			return err;
@@ -2249,8 +2245,8 @@ static int tegra_sor_exit(struct host1x_client *client)
 
 	tegra_output_exit(&sor->output);
 
-	if (sor->dpaux) {
-		err = tegra_dpaux_detach(sor->dpaux);
+	if (sor->aux) {
+		err = drm_dp_aux_detach(sor->aux);
 		if (err < 0) {
 			dev_err(sor->dev, "failed to detach DP: %d\n", err);
 			return err;
@@ -2399,14 +2395,14 @@ static int tegra_sor_probe(struct platform_device *pdev)
 
 	np = of_parse_phandle(pdev->dev.of_node, "nvidia,dpaux", 0);
 	if (np) {
-		sor->dpaux = tegra_dpaux_find_by_of_node(np);
+		sor->aux = drm_dp_aux_find_by_of_node(np);
 		of_node_put(np);
 
-		if (!sor->dpaux)
+		if (!sor->aux)
 			return -EPROBE_DEFER;
 	}
 
-	if (!sor->dpaux) {
+	if (!sor->aux) {
 		if (sor->soc->supports_hdmi) {
 			sor->ops = &tegra_sor_hdmi_ops;
 		} else if (sor->soc->supports_lvds) {