drm: meson: dw-hdmi: Use dw_hdmi context to replace hack

The meson-dw-hdmi driver needs to access its own context from the
.mode_valid() operation. It currently gets it from the dev_private field
of the drm_device retrieved from the connector, which is a hack. Use the
private data passed to the .mode_valid() operation instead.
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/20200526011505.31884-15-laurent.pinchart+renesas@ideasonboard.com

drivers/gpu/drm/meson/meson_dw_hdmi.c

@@ -634,7 +634,8 @@ 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;
+	struct meson_dw_hdmi *dw_hdmi = data;
+	struct meson_drm *priv = dw_hdmi->priv;
 	bool is_hdmi2_sink = connector->display_info.hdmi.scdc.supported;
 	unsigned int phy_freq;
 	unsigned int vclk_freq;
@@ -693,7 +694,7 @@ dw_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
 	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 		venc_freq /= 2;
 
-	dev_dbg(connector->dev->dev, "%s: vclk:%d phy=%d venc=%d hdmi=%d\n",
+	dev_dbg(dw_hdmi->dev, "%s: vclk:%d phy=%d venc=%d hdmi=%d\n",
 		__func__, phy_freq, vclk_freq, venc_freq, hdmi_freq);
 
 	return meson_vclk_vic_supported_freq(priv, phy_freq, vclk_freq);
@@ -1068,6 +1069,7 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
 
 	/* Bridge / Connector */
 
+	dw_plat_data->priv_data = meson_dw_hdmi;
 	dw_plat_data->mode_valid = dw_hdmi_mode_valid;
 	dw_plat_data->phy_ops = &meson_dw_hdmi_phy_ops;
 	dw_plat_data->phy_name = "meson_dw_hdmi_phy";