phy: xilinx-xhdmiphy: Get resolutions < 1920x1080@60 working

Fix the display of resolutions smaller than 1920x1080@60 by getting the
correct sample rate from phy based on TMDS ref clock.

Signed-off-by: Rajesh Gugulothu <rajesh.gugulothu@amd.com>
Tested-by: Jaihind Biradar <jaihind.biradar@amd.com>
Reviewed-by: Vishal Sagar <vishal.sagar@amd.com>

Author: gugulot

drivers/phy/xilinx/xhdmiphy.c

@@ -180,6 +180,8 @@ static int xhdmiphy_configure(struct phy *phy, union phy_configure_opts *opts)
 			xhdmiphy_ibufds_en(phy_dev, XHDMIPHY_DIR_TX,
 					   cfg->ibufds_en);
 			cfg->ibufds = 0;
+		} else if (cfg->get_samplerate) {
+			cfg->samplerate = phy_dev->tx_samplerate;
 		} else if (cfg->clkout1_obuftds) {
 			xhdmiphy_clkout1_obuftds_en(phy_dev, XHDMIPHY_DIR_TX,
 						    cfg->clkout1_obuftds_en);

include/linux/phy/phy-hdmi.h

@@ -206,6 +206,22 @@ struct phy_configure_opts_hdmi {
 	 * Flag to reset the GT
 	 */
 	u8 reset_gt : 1;
+	/**
+	 * @get_samplerate:
+	 *
+	 * Flag to get the samplerate value from the PHY driver
+	 *
+	 * Allowed values: 0, 1
+	 */
+	u8 get_samplerate : 1;
+	/**
+	 * @samplerate:
+	 *
+	 * samplerate value.
+	 *
+	 * Allowed values: 1, 2, 3, 5
+	 */
+	u8 samplerate;
 };
 
 #endif /* __PHY_HDMI_H_ */