phy: rockchip: samsung-hdptx: Extend rk_hdptx_phy_verify_hdmi_config() helper

In order to facilitate introduction of HDMI 2.1 FRL support and to avoid
recomputing the link rate after verifying the HDMI configuration given
as input, extend rk_hdptx_phy_verify_hdmi_config() by providing an
optional output parameter to store the validated configuration.

For improved code readability, also rename the existing hdmi input
parameter.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://patch.msgid.link/20260113-phy-hdptx-frl-v6-10-8d5f97419c0b@collabora.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: cristicc

drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c

@@ -1439,25 +1439,24 @@ static int rk_hdptx_phy_power_off(struct phy *phy)
 }
 
 static int rk_hdptx_phy_verify_hdmi_config(struct rk_hdptx_phy *hdptx,
-					   struct phy_configure_opts_hdmi *hdmi)
+					   struct phy_configure_opts_hdmi *hdmi_in,
+					   struct rk_hdptx_hdmi_cfg *hdmi_out)
 {
 	int i;
 
-	if (!hdmi->tmds_char_rate || hdmi->tmds_char_rate > HDMI20_MAX_RATE)
+	if (!hdmi_in->tmds_char_rate || hdmi_in->tmds_char_rate > HDMI20_MAX_RATE)
 		return -EINVAL;
 
 	for (i = 0; i < ARRAY_SIZE(rk_hdptx_tmds_ropll_cfg); i++)
-		if (hdmi->tmds_char_rate == rk_hdptx_tmds_ropll_cfg[i].rate)
+		if (hdmi_in->tmds_char_rate == rk_hdptx_tmds_ropll_cfg[i].rate)
 			break;
 
 	if (i == ARRAY_SIZE(rk_hdptx_tmds_ropll_cfg) &&
-	    !rk_hdptx_phy_clk_pll_calc(hdmi->tmds_char_rate, NULL))
+	    !rk_hdptx_phy_clk_pll_calc(hdmi_in->tmds_char_rate, NULL))
 		return -EINVAL;
 
-	if (!hdmi->bpc)
-		hdmi->bpc = 8;
-
-	switch (hdmi->bpc) {
+	switch (hdmi_in->bpc) {
+	case 0:
 	case 8:
 	case 10:
 	case 12:
@@ -1467,6 +1466,11 @@ static int rk_hdptx_phy_verify_hdmi_config(struct rk_hdptx_phy *hdptx,
 		return -EINVAL;
 	}
 
+	if (hdmi_out) {
+		hdmi_out->rate = hdmi_in->tmds_char_rate;
+		hdmi_out->bpc = hdmi_in->bpc ?: 8;
+	}
+
 	return 0;
 }
 
@@ -1732,17 +1736,15 @@ static int rk_hdptx_phy_configure(struct phy *phy, union phy_configure_opts *opt
 	int ret;
 
 	if (mode != PHY_MODE_DP) {
-		ret = rk_hdptx_phy_verify_hdmi_config(hdptx, &opts->hdmi);
+		ret = rk_hdptx_phy_verify_hdmi_config(hdptx, &opts->hdmi, &hdptx->hdmi_cfg);
 		if (ret) {
 			dev_err(hdptx->dev, "invalid hdmi params for phy configure\n");
 		} else {
-			hdptx->hdmi_cfg.rate = opts->hdmi.tmds_char_rate;
-			hdptx->hdmi_cfg.bpc = opts->hdmi.bpc;
 			hdptx->restrict_rate_change = true;
+			dev_dbg(hdptx->dev, "%s rate=%llu bpc=%u\n", __func__,
+				hdptx->hdmi_cfg.rate, hdptx->hdmi_cfg.bpc);
 		}
 
-		dev_dbg(hdptx->dev, "%s rate=%llu bpc=%u\n", __func__,
-			hdptx->hdmi_cfg.rate, hdptx->hdmi_cfg.bpc);
 		return ret;
 	}
 
@@ -1786,7 +1788,7 @@ static int rk_hdptx_phy_validate(struct phy *phy, enum phy_mode mode,
 	struct rk_hdptx_phy *hdptx = phy_get_drvdata(phy);
 
 	if (mode != PHY_MODE_DP)
-		return rk_hdptx_phy_verify_hdmi_config(hdptx, &opts->hdmi);
+		return rk_hdptx_phy_verify_hdmi_config(hdptx, &opts->hdmi, NULL);
 
 	return rk_hdptx_phy_verify_dp_config(hdptx, &opts->dp);
 }
@@ -1926,12 +1928,11 @@ static int rk_hdptx_phy_clk_determine_rate(struct clk_hw *hw,
 		struct phy_configure_opts_hdmi hdmi = {
 			.tmds_char_rate = req->rate,
 		};
-		int ret = rk_hdptx_phy_verify_hdmi_config(hdptx, &hdmi);
+
+		int ret = rk_hdptx_phy_verify_hdmi_config(hdptx, &hdmi, &hdptx->hdmi_cfg);
 
 		if (ret)
 			return ret;
-
-		hdptx->hdmi_cfg.rate = req->rate;
 	}
 
 	/*