[PATCH v4 08/12] phy: rockchip: samsung-hdptx: Provide config params validation support

[Cristian Ciocaltea]

Implement the phy_ops.validate() callback to allow checking the PHY
configuration parameters without actually applying them.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>
---
 drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
index 7e1d1c10758249aa5bbddbdaae0108bba04f30df..47db1395051f5d900197871694bab90ca4d6e38e 100644
--- a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
+++ b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
@@ -1482,6 +1482,17 @@ static int rk_hdptx_phy_verify_hdmi_config(struct rk_hdptx_phy *hdptx,
 	if (!hdmi->tmds_char_rate || hdmi->tmds_char_rate > HDMI20_MAX_RATE)
 		return -EINVAL;
 
+	u32 bit_rate = hdmi->tmds_char_rate / 100;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ropll_tmds_cfg); i++)
+		if (bit_rate == ropll_tmds_cfg[i].bit_rate)
+			break;
+
+	if (i == ARRAY_SIZE(ropll_tmds_cfg) &&
+	    !rk_hdptx_phy_clk_pll_calc(bit_rate, NULL))
+		return -EINVAL;
+
 	return 0;
 }
 
@@ -1789,10 +1800,22 @@ static int rk_hdptx_phy_configure(struct phy *phy, union phy_configure_opts *opt
 	return 0;
 }
 
+static int rk_hdptx_phy_validate(struct phy *phy, enum phy_mode mode,
+				 int submode, union phy_configure_opts *opts)
+{
+	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_dp_config(hdptx, &opts->dp);
+}
+
 static const struct phy_ops rk_hdptx_phy_ops = {
 	.power_on  = rk_hdptx_phy_power_on,
 	.power_off = rk_hdptx_phy_power_off,
 	.configure = rk_hdptx_phy_configure,
+	.validate  = rk_hdptx_phy_validate,
 	.owner	   = THIS_MODULE,
 };
 

-- 
2.48.1