[PATCH] media: qcom: camss: configure C-PHY in the new csiphy_stream_on()

[Anusha Arun Nandi <anusha.nandi@oss.qualcomm.com>]

The new (non-legacy) csiphy_stream_on() introduced by the PHY API
devices support only built a MIPI D-PHY configuration and
unconditionally called phy_set_mode(PHY_MODE_MIPI_DPHY). For a C-PHY
sensor this makes phy_configure() dispatch to the C-PHY handler with a
D-PHY opts union, which fails validation.

Branch on the recorded PHY type: for C-PHY build the opts via
phy_mipi_cphy_get_default_config_for_hsclk(), populate the per-trio
lane positions and polarities and select PHY_MODE_MIPI_CPHY; 
keep the existing D-PHY path otherwise. The shared
phy_configure()/phy_power_on() tail handles both.

Depends-on: https://lore.kernel.org/all/20261017035221.3816464-1-anusha.nandi@oss.qualcomm.com/

Signed-off-by: Anusha Arun Nandi <anusha.nandi@oss.qualcomm.com>
---
 .../media/platform/qcom/camss/camss-csiphy.c  | 61 +++++++++++++------
 1 file changed, 43 insertions(+), 18 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
index 60d58becc7c5..5ee07b969005 100644
--- a/drivers/media/platform/qcom/camss/camss-csiphy.c
+++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
@@ -329,16 +329,15 @@ static int csiphy_stream_on(struct csiphy_device *csiphy)
 	u8 bpp = csiphy_get_bpp(csiphy->res->formats->formats, csiphy->res->formats->nformats,
 				csiphy->fmt[MSM_CSIPHY_PAD_SINK].code);
 	struct csiphy_lanes_cfg *lncfg = &csiphy->cfg.csi2->lane_cfg;
-	struct phy_configure_opts_mipi_dphy *dphy_cfg;
-	union phy_configure_opts dphy_opts = { 0 };
+	union phy_configure_opts phy_opts = { 0 };
 	struct device *dev = csiphy->camss->dev;
 	u8 num_lanes = lncfg->num_data;
+	const bool cphy = (lncfg->phy_cfg == V4L2_MBUS_CSI2_CPHY);
 	s64 link_freq;
+	int i;
 	int ret;
 
-	dphy_cfg = &dphy_opts.mipi_dphy;
-
-	link_freq = camss_get_link_freq(&csiphy->subdev.entity, bpp, num_lanes, false);
+	link_freq = camss_get_link_freq(&csiphy->subdev.entity, bpp, num_lanes, cphy);
 
 	if (link_freq <= 0) {
 		dev_err(dev,
@@ -346,23 +345,49 @@ static int csiphy_stream_on(struct csiphy_device *csiphy)
 		return -EINVAL;
 	}
 
-	ret = phy_mipi_dphy_get_default_config_for_hsclk(link_freq, num_lanes,
-							 dphy_cfg);
-	if (ret < 0) {
-		dev_err(dev, "Invalid config for link frequency %lld\n",
-			link_freq);
-		return ret;
-	}
+	if (cphy) {
+		struct phy_configure_opts_mipi_cphy *cphy_cfg = &phy_opts.mipi_cphy;
 
-	ret = phy_set_mode(csiphy->phy, PHY_MODE_MIPI_DPHY);
-	if (ret) {
-		dev_err(dev, "Failed to set phy mode\n");
-		return ret;
+		ret = phy_mipi_cphy_get_default_config_for_hsclk(link_freq, num_lanes,
+								 cphy_cfg);
+		if (ret < 0) {
+			dev_err(dev, "Invalid config for link frequency %lld\n",
+				link_freq);
+			return ret;
+		}
+
+		/* Set data trio lane positions and polarities (no clock lane) */
+		for (i = 0; i < num_lanes; i++) {
+			cphy_cfg->lane_positions[i] = lncfg->data[i].pos;
+			cphy_cfg->lane_polarities[i] = lncfg->data[i].pol;
+		}
+
+		ret = phy_set_mode(csiphy->phy, PHY_MODE_MIPI_CPHY);
+		if (ret) {
+			dev_err(dev, "Failed to set phy mode\n");
+			return ret;
+		}
+	} else {
+		struct phy_configure_opts_mipi_dphy *dphy_cfg = &phy_opts.mipi_dphy;
+
+		ret = phy_mipi_dphy_get_default_config_for_hsclk(link_freq, num_lanes,
+								 dphy_cfg);
+		if (ret < 0) {
+			dev_err(dev, "Invalid config for link frequency %lld\n",
+				link_freq);
+			return ret;
+		}
+
+		ret = phy_set_mode(csiphy->phy, PHY_MODE_MIPI_DPHY);
+		if (ret) {
+			dev_err(dev, "Failed to set phy mode\n");
+			return ret;
+		}
 	}
 
-	ret = phy_configure(csiphy->phy, &dphy_opts);
+	ret = phy_configure(csiphy->phy, &phy_opts);
 	if (ret) {
-		dev_err(dev, "failed to configure MIPI D-PHY\n");
+		dev_err(dev, "failed to configure MIPI %s\n", cphy ? "C-PHY" : "D-PHY");
 		goto error;
 	}

--  
Best regards,
-- 
Anusha Arun Nandi <anusha.nandi@oss.qualcomm.com>
-- 
2.34.1