drm: bridge: dw-hdmi: Pass private data pointer to .mode_valid()

Platform glue drivers for dw_hdmi may need to access device-specific
data from their .mode_valid() implementation. They currently have no
clean way to do so, and one driver hacks around it by accessing the
dev_private data of the drm_device retrieved from the connector.

Add a priv_data void pointer to the dw_hdmi_plat_data structure, and
pass it to the .mode_valid() function.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200526011505.31884-12-laurent.pinchart+renesas@ideasonboard.com

drivers/gpu/drm/bridge/synopsys/dw-hdmi.c

@@ -2771,6 +2771,7 @@ dw_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
 			  const struct drm_display_mode *mode)
 {
 	struct dw_hdmi *hdmi = bridge->driver_private;
+	const struct dw_hdmi_plat_data *pdata = hdmi->plat_data;
 	struct drm_connector *connector = &hdmi->connector;
 	enum drm_mode_status mode_status = MODE_OK;
 
@@ -2778,8 +2779,9 @@ dw_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
 	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 		return MODE_BAD;
 
-	if (hdmi->plat_data->mode_valid)
-		mode_status = hdmi->plat_data->mode_valid(connector, mode);
+	if (pdata->mode_valid)
+		mode_status = pdata->mode_valid(hdmi, pdata->priv_data,
+						connector, mode);
 
 	return mode_status;
 }

drivers/gpu/drm/imx/dw_hdmi-imx.c

@@ -145,7 +145,8 @@ static const struct drm_encoder_helper_funcs dw_hdmi_imx_encoder_helper_funcs =
 };
 
 static enum drm_mode_status
-imx6q_hdmi_mode_valid(struct drm_connector *con,
+imx6q_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
+		      struct drm_connector *con,
 		      const struct drm_display_mode *mode)
 {
 	if (mode->clock < 13500)
@@ -158,7 +159,8 @@ imx6q_hdmi_mode_valid(struct drm_connector *con,
 }
 
 static enum drm_mode_status
-imx6dl_hdmi_mode_valid(struct drm_connector *con,
+imx6dl_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
+		       struct drm_connector *con,
 		       const struct drm_display_mode *mode)
 {
 	if (mode->clock < 13500)

drivers/gpu/drm/meson/meson_dw_hdmi.c

@@ -630,7 +630,8 @@ static irqreturn_t dw_hdmi_top_thread_irq(int irq, void *dev_id)
 }
 
 static enum drm_mode_status
-dw_hdmi_mode_valid(struct drm_connector *connector,
+dw_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
+		   struct drm_connector *connector,
 		   const struct drm_display_mode *mode)
 {
 	struct meson_drm *priv = connector->dev->dev_private;

drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c

@@ -38,7 +38,8 @@ static const struct rcar_hdmi_phy_params rcar_hdmi_phy_params[] = {
 };
 
 static enum drm_mode_status
-rcar_hdmi_mode_valid(struct drm_connector *connector,
+rcar_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
+		     struct drm_connector *connector,
 		     const struct drm_display_mode *mode)
 {
 	/*

drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c

@@ -220,7 +220,8 @@ static int rockchip_hdmi_parse_dt(struct rockchip_hdmi *hdmi)
 }
 
 static enum drm_mode_status
-dw_hdmi_rockchip_mode_valid(struct drm_connector *connector,
+dw_hdmi_rockchip_mode_valid(struct dw_hdmi *hdmi, void *data,
+			    struct drm_connector *connector,
 			    const struct drm_display_mode *mode)
 {
 	const struct dw_hdmi_mpll_config *mpll_cfg = rockchip_mpll_cfg;

drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c

@@ -31,7 +31,8 @@ sun8i_dw_hdmi_encoder_helper_funcs = {
 };
 
 static enum drm_mode_status
-sun8i_dw_hdmi_mode_valid_a83t(struct drm_connector *connector,
+sun8i_dw_hdmi_mode_valid_a83t(struct dw_hdmi *hdmi, void *data,
+			      struct drm_connector *connector,
 			      const struct drm_display_mode *mode)
 {
 	if (mode->clock > 297000)
@@ -41,7 +42,8 @@ sun8i_dw_hdmi_mode_valid_a83t(struct drm_connector *connector,
 }
 
 static enum drm_mode_status
-sun8i_dw_hdmi_mode_valid_h6(struct drm_connector *connector,
+sun8i_dw_hdmi_mode_valid_h6(struct dw_hdmi *hdmi, void *data,
+			    struct drm_connector *connector,
 			    const struct drm_display_mode *mode)
 {
 	/*

drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h

@@ -176,7 +176,8 @@ struct sun8i_hdmi_phy {
 };
 
 struct sun8i_dw_hdmi_quirks {
-	enum drm_mode_status (*mode_valid)(struct drm_connector *connector,
+	enum drm_mode_status (*mode_valid)(struct dw_hdmi *hdmi, void *data,
+					   struct drm_connector *connector,
 					   const struct drm_display_mode *mode);
 	unsigned int set_rate : 1;
 	unsigned int use_drm_infoframe : 1;

include/drm/bridge/dw_hdmi.h

@@ -124,13 +124,23 @@ struct dw_hdmi_phy_ops {
 
 struct dw_hdmi_plat_data {
 	struct regmap *regm;
-	enum drm_mode_status (*mode_valid)(struct drm_connector *connector,
-					   const struct drm_display_mode *mode);
+
 	unsigned long input_bus_format;
 	unsigned long input_bus_encoding;
 	bool use_drm_infoframe;
 	bool ycbcr_420_allowed;
 
+	/*
+	 * Private data passed to all the .mode_valid() and .configure_phy()
+	 * callback functions.
+	 */
+	void *priv_data;
+
+	/* Platform-specific mode validation (optional). */
+	enum drm_mode_status (*mode_valid)(struct dw_hdmi *hdmi, void *data,
+					   struct drm_connector *connector,
+					   const struct drm_display_mode *mode);
+
 	/* Vendor PHY support */
 	const struct dw_hdmi_phy_ops *phy_ops;
 	const char *phy_name;