diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 2f4b8f64cbad..7d8bf292fedc 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -74,6 +74,7 @@ struct rockchip_hdmi {
 	struct regmap *regmap;
 	struct rockchip_encoder encoder;
 	const struct rockchip_hdmi_chip_data *chip_data;
+	const struct dw_hdmi_plat_data *plat_data;
 	struct clk *ref_clk;
 	struct clk *grf_clk;
 	struct dw_hdmi *hdmi;
@@ -241,23 +242,32 @@ static int rockchip_hdmi_parse_dt(struct rockchip_hdmi *hdmi)
 }
 
 static enum drm_mode_status
-dw_hdmi_rockchip_mode_valid(struct dw_hdmi *hdmi, void *data,
+dw_hdmi_rockchip_mode_valid(struct dw_hdmi *dw_hdmi, void *data,
 			    const struct drm_display_info *info,
 			    const struct drm_display_mode *mode)
 {
+	struct rockchip_hdmi *hdmi = data;
 	const struct dw_hdmi_mpll_config *mpll_cfg = rockchip_mpll_cfg;
 	int pclk = mode->clock * 1000;
-	bool valid = false;
+	bool exact_match = hdmi->plat_data->phy_force_vendor;
 	int i;
 
 	for (i = 0; mpll_cfg[i].mpixelclock != (~0UL); i++) {
-		if (pclk == mpll_cfg[i].mpixelclock) {
-			valid = true;
-			break;
-		}
+		/*
+		 * For vendor specific phys force an exact match of the pixelclock
+		 * to preserve the original behaviour of the driver.
+		 */
+		if (exact_match && pclk == mpll_cfg[i].mpixelclock)
+			return MODE_OK;
+		/*
+		 * The Synopsys phy can work with pixelclocks up to the value given
+		 * in the corresponding mpll_cfg entry.
+		 */
+		if (!exact_match && pclk <= mpll_cfg[i].mpixelclock)
+			return MODE_OK;
 	}
 
-	return (valid) ? MODE_OK : MODE_BAD;
+	return MODE_BAD;
 }
 
 static void dw_hdmi_rockchip_encoder_disable(struct drm_encoder *encoder)
@@ -546,8 +556,10 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
 		return -ENOMEM;
 
 	hdmi->dev = &pdev->dev;
+	hdmi->plat_data = plat_data;
 	hdmi->chip_data = plat_data->phy_data;
 	plat_data->phy_data = hdmi;
+	plat_data->priv_data = hdmi;
 	encoder = &hdmi->encoder.encoder;
 
 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);