[PATCH v2 4/8] phy: qcom-qmp-combo: Introduce orientation variable

[Bjorn Andersson]

In multiple places throughout the driver code has been written in
prepration for handling of orientation switching.

Introduce a typec_orientation in qmp_combo and fill out the various
"placeholders" with the associated logic. By initializing the
orientation to "normal" this change has no functional impact, but
reduces the size of the upcoming introduction of dynamic orientation
switching.

Signed-off-by: Bjorn Andersson <quic_bjorande at quicinc.com>
Reviewed-by: Neil Armstrong <neil.armstrong at linaro.org>
Tested-by: Abel Vesa <abel.vesa at linaro.org>
Tested-by: Steev Klimaszewski <steev at kali.org>
Tested-by: Neil Armstrong <neil.armstrong at linaro.org> # on HDK8450
Tested-by: Johan Hovold <johan+linaro at kernel.org>	# X13s
---

Changes since v1:
- X-mas in qmp_combo_configure_dp_mode()

 drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 54 +++++++++++++----------
 1 file changed, 30 insertions(+), 24 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
index 6baacdf3a4cb..e0d246e7086d 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
@@ -19,6 +19,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>
 #include <linux/slab.h>
+#include <linux/usb/typec.h>
 
 #include <dt-bindings/phy/phy-qcom-qmp.h>
 
@@ -63,6 +64,10 @@
 /* QPHY_V3_PCS_MISC_CLAMP_ENABLE register bits */
 #define CLAMP_EN				BIT(0) /* enables i/o clamp_n */
 
+/* QPHY_V3_DP_COM_TYPEC_CTRL register bits */
+#define SW_PORTSELECT_VAL			BIT(0)
+#define SW_PORTSELECT_MUX			BIT(1)
+
 #define PHY_INIT_COMPLETE_TIMEOUT		10000
 
 struct qmp_phy_init_tbl {
@@ -1323,6 +1328,8 @@ struct qmp_combo {
 	struct clk_fixed_rate pipe_clk_fixed;
 	struct clk_hw dp_link_hw;
 	struct clk_hw dp_pixel_hw;
+
+	enum typec_orientation orientation;
 };
 
 static void qmp_v3_dp_aux_init(struct qmp_combo *qmp);
@@ -1954,30 +1961,24 @@ static void qmp_v3_configure_dp_tx(struct qmp_combo *qmp)
 
 static bool qmp_combo_configure_dp_mode(struct qmp_combo *qmp)
 {
+	bool reverse = qmp->orientation == TYPEC_ORIENTATION_REVERSE;
+	const struct phy_configure_opts_dp *dp_opts = &qmp->dp_opts;
 	u32 val;
-	bool reverse = false;
 
 	val = DP_PHY_PD_CTL_PWRDN | DP_PHY_PD_CTL_AUX_PWRDN |
 	      DP_PHY_PD_CTL_PLL_PWRDN | DP_PHY_PD_CTL_DP_CLAMP_EN;
 
-	/*
-	 * TODO: Assume orientation is CC1 for now and two lanes, need to
-	 * use type-c connector to understand orientation and lanes.
-	 *
-	 * Otherwise val changes to be like below if this code understood
-	 * the orientation of the type-c cable.
-	 *
-	 * if (lane_cnt == 4 || orientation == ORIENTATION_CC2)
-	 *	val |= DP_PHY_PD_CTL_LANE_0_1_PWRDN;
-	 * if (lane_cnt == 4 || orientation == ORIENTATION_CC1)
-	 *	val |= DP_PHY_PD_CTL_LANE_2_3_PWRDN;
-	 * if (orientation == ORIENTATION_CC2)
-	 *	writel(0x4c, qmp->dp_dp_phy + QSERDES_V3_DP_PHY_MODE);
-	 */
-	val |= DP_PHY_PD_CTL_LANE_2_3_PWRDN;
+	if (dp_opts->lanes == 4 || reverse)
+		val |= DP_PHY_PD_CTL_LANE_0_1_PWRDN;
+	if (dp_opts->lanes == 4 || !reverse)
+		val |= DP_PHY_PD_CTL_LANE_2_3_PWRDN;
+
 	writel(val, qmp->dp_dp_phy + QSERDES_DP_PHY_PD_CTL);
 
-	writel(0x5c, qmp->dp_dp_phy + QSERDES_DP_PHY_MODE);
+	if (reverse)
+		writel(0x4c, qmp->pcs + QSERDES_DP_PHY_MODE);
+	else
+		writel(0x5c, qmp->pcs + QSERDES_DP_PHY_MODE);
 
 	return reverse;
 }
@@ -2235,7 +2236,7 @@ static int qmp_v4_configure_dp_phy(struct qmp_combo *qmp)
 {
 	const struct phy_configure_opts_dp *dp_opts = &qmp->dp_opts;
 	u32 bias0_en, drvr0_en, bias1_en, drvr1_en;
-	bool reverse = false;
+	bool reverse = qmp->orientation == TYPEC_ORIENTATION_REVERSE;
 	u32 status;
 	int ret;
 
@@ -2299,7 +2300,7 @@ static int qmp_v5_configure_dp_phy(struct qmp_combo *qmp)
 {
 	const struct phy_configure_opts_dp *dp_opts = &qmp->dp_opts;
 	u32 bias0_en, drvr0_en, bias1_en, drvr1_en;
-	bool reverse = false;
+	bool reverse = qmp->orientation == TYPEC_ORIENTATION_REVERSE;
 	u32 status;
 	int ret;
 
@@ -2358,7 +2359,7 @@ static int qmp_v6_configure_dp_phy(struct qmp_combo *qmp)
 {
 	const struct phy_configure_opts_dp *dp_opts = &qmp->dp_opts;
 	u32 bias0_en, drvr0_en, bias1_en, drvr1_en;
-	bool reverse = false;
+	bool reverse = qmp->orientation == TYPEC_ORIENTATION_REVERSE;
 	u32 status;
 	int ret;
 
@@ -2471,6 +2472,7 @@ static int qmp_combo_com_init(struct qmp_combo *qmp)
 	const struct qmp_phy_cfg *cfg = qmp->cfg;
 	void __iomem *com = qmp->com;
 	int ret;
+	u32 val;
 
 	if (qmp->init_count++)
 		return 0;
@@ -2504,10 +2506,12 @@ static int qmp_combo_com_init(struct qmp_combo *qmp)
 			SW_DPPHY_RESET_MUX | SW_DPPHY_RESET |
 			SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET);
 
-	/* Default type-c orientation, i.e CC1 */
-	qphy_setbits(com, QPHY_V3_DP_COM_TYPEC_CTRL, 0x02);
-
-	qphy_setbits(com, QPHY_V3_DP_COM_PHY_MODE_CTRL, USB3_MODE | DP_MODE);
+	/* Use software based port select and switch on typec orientation */
+	val = SW_PORTSELECT_MUX;
+	if (qmp->orientation == TYPEC_ORIENTATION_REVERSE)
+		val |= SW_PORTSELECT_VAL;
+	writel(val, com + QPHY_V3_DP_COM_TYPEC_CTRL);
+	writel(USB3_MODE | DP_MODE, com + QPHY_V3_DP_COM_PHY_MODE_CTRL);
 
 	/* bring both QMP USB and QMP DP PHYs PCS block out of reset */
 	qphy_clrbits(com, QPHY_V3_DP_COM_RESET_OVRD_CTRL,
@@ -3379,6 +3383,8 @@ static int qmp_combo_probe(struct platform_device *pdev)
 
 	qmp->dev = dev;
 
+	qmp->orientation = TYPEC_ORIENTATION_NORMAL;
+
 	qmp->cfg = of_device_get_match_data(dev);
 	if (!qmp->cfg)
 		return -EINVAL;
-- 
2.39.2