Date:   Mon, 27 Dec 2021 21:21:10 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: [PATCH 2/8] phy: qcom-qmp: Register typec mux and orientation switch

The QMP PHY handles muxing of USB vs DisplayPort, as well as orientation
switching of the SuperSpeed lanes. So register typec handlers for the
two types.

The TypeC mux allows switching between four lanes of DisplayPort and a
mixed USB+DP combination. This makes it possible to reach resolutions
that requires 4 lanes.

The TypeC switch allows switching the SuperSpeed pins and have been
tested with both 2 and 4 lane DisplayPort.

It's possible that in the USB mode the DP_MODE should be disabled, but
this is left untouched.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---

My suggestion is that if/once this patch is deemed acceptable the PHY
maintainers could create a immutable branch/tag which can be merged into the
PHY tree as well as the USB tree.

 drivers/phy/qualcomm/phy-qcom-qmp.c | 176 +++++++++++++++++++++++++---
 1 file changed, 158 insertions(+), 18 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 7bea6a60dc54..8d8139df9d8e 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -19,6 +19,8 @@
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>
 #include <linux/slab.h>
+#include <linux/usb/typec_dp.h>
+#include <linux/usb/typec_mux.h>
 
 #include <dt-bindings/phy/phy.h>
 
@@ -3017,6 +3019,9 @@ struct qmp_phy_dp_clks {
  * @phy_mutex: mutex lock for PHY common block initialization
  * @init_count: phy common block initialization count
  * @ufs_reset: optional UFS PHY reset handle
+ * @sw: typec switch for receiving orientation changes
+ * @mux: typec mux for DP muxing
+ * @orientation: carries current CC orientation
  */
 struct qcom_qmp {
 	struct device *dev;
@@ -3032,6 +3037,10 @@ struct qcom_qmp {
 	int init_count;
 
 	struct reset_control *ufs_reset;
+
+	struct typec_switch *sw;
+	struct typec_mux *mux;
+	enum typec_orientation orientation;
 };
 
 static void qcom_qmp_v3_phy_dp_aux_init(struct qmp_phy *qphy);
@@ -4378,30 +4387,23 @@ static void qcom_qmp_v3_phy_configure_dp_tx(struct qmp_phy *qphy)
 
 static bool qcom_qmp_phy_configure_dp_mode(struct qmp_phy *qphy)
 {
+	const struct phy_configure_opts_dp *dp_opts = &qphy->dp_opts;
+	bool reverse = qphy->qmp->orientation == TYPEC_ORIENTATION_REVERSE;
 	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, qphy->pcs + 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, qphy->pcs + QSERDES_DP_PHY_PD_CTL);
 
-	writel(0x5c, qphy->pcs + QSERDES_DP_PHY_MODE);
+	if (reverse)
+		writel(0x4c, qphy->pcs + QSERDES_DP_PHY_MODE);
+	else
+		writel(0x5c, qphy->pcs + QSERDES_DP_PHY_MODE);
 
 	return reverse;
 }
@@ -5809,6 +5811,123 @@ static const struct dev_pm_ops qcom_qmp_phy_pm_ops = {
 			   qcom_qmp_phy_runtime_resume, NULL)
 };
 
+#if IS_ENABLED(CONFIG_TYPEC)
+static int qcom_qmp_phy_typec_switch_set(struct typec_switch *sw,
+		enum typec_orientation orientation)
+{
+	struct qcom_qmp *qmp = typec_switch_get_drvdata(sw);
+	void __iomem *dp_com = qmp->dp_com;
+
+	qmp->orientation = orientation;
+
+	if (orientation == TYPEC_ORIENTATION_REVERSE)
+		qphy_setbits(dp_com, QPHY_V3_DP_COM_TYPEC_CTRL, 0x01);
+	else
+		qphy_clrbits(dp_com, QPHY_V3_DP_COM_TYPEC_CTRL, 0x01);
+
+	return 0;
+}
+
+static int qcom_qmp_phy_typec_mux_set(struct typec_mux *mux,
+				      struct typec_mux_state *state)
+{
+	struct qcom_qmp *qmp = typec_mux_get_drvdata(mux);
+	void __iomem *dp_com = qmp->dp_com;
+	bool dp_mode;
+	bool usb_mode;
+
+	switch (state->mode) {
+	case TYPEC_STATE_SAFE:
+	case TYPEC_STATE_USB:
+		/*
+		 * TODO: Figure out if we should clear DP_MODE when we enter a
+		 * USB-only state.
+		 */
+		dp_mode = true;
+		usb_mode = true;
+		break;
+	case TYPEC_DP_STATE_A:
+	case TYPEC_DP_STATE_C:
+	case TYPEC_DP_STATE_E:
+		dp_mode = true;
+		usb_mode = false;
+		break;
+	case TYPEC_DP_STATE_B:
+	case TYPEC_DP_STATE_D:
+	case TYPEC_DP_STATE_F:
+		dp_mode = true;
+		usb_mode = true;
+		break;
+	}
+
+	qphy_setbits(dp_com, QPHY_V3_DP_COM_RESET_OVRD_CTRL,
+		     SW_DPPHY_RESET_MUX | SW_USB3PHY_RESET_MUX);
+	if (dp_mode)
+		qphy_setbits(dp_com, QPHY_V3_DP_COM_PHY_MODE_CTRL, DP_MODE);
+	else
+		qphy_clrbits(dp_com, QPHY_V3_DP_COM_PHY_MODE_CTRL, DP_MODE);
+
+	if (usb_mode)
+		qphy_setbits(dp_com, QPHY_V3_DP_COM_PHY_MODE_CTRL, USB3_MODE);
+	else
+		qphy_clrbits(dp_com, QPHY_V3_DP_COM_PHY_MODE_CTRL, USB3_MODE);
+
+	qphy_setbits(dp_com, QPHY_V3_DP_COM_SW_RESET, SW_RESET);
+	qphy_clrbits(dp_com, QPHY_V3_DP_COM_SWI_CTRL, 0x03);
+	qphy_clrbits(dp_com, QPHY_V3_DP_COM_SW_RESET, SW_RESET);
+
+	return 0;
+}
+
+static int qcom_qmp_phy_typec_register(struct qcom_qmp *qmp,
+				       const struct qmp_phy_cfg *cfg)
+{
+	struct typec_switch_desc sw_desc = {};
+	struct typec_mux_desc mux_desc = {};
+	struct device *dev = qmp->dev;
+
+	if (!cfg->has_phy_dp_com_ctrl)
+		return 0;
+
+	sw_desc.drvdata = qmp;
+	sw_desc.fwnode = dev->fwnode;
+	sw_desc.set = qcom_qmp_phy_typec_switch_set;
+	qmp->sw = typec_switch_register(dev, &sw_desc);
+	if (IS_ERR(qmp->sw)) {
+		dev_err(dev, "Error registering typec switch: %pe\n", qmp->sw);
+		return PTR_ERR(qmp->sw);
+	}
+
+	mux_desc.drvdata = qmp;
+	mux_desc.fwnode = dev->fwnode;
+	mux_desc.set = qcom_qmp_phy_typec_mux_set;
+	qmp->mux = typec_mux_register(dev, &mux_desc);
+	if (IS_ERR(qmp->mux)) {
+		dev_err(dev, "Error registering typec mux: %pe\n", qmp->mux);
+		typec_switch_unregister(qmp->sw);
+		return PTR_ERR(qmp->mux);
+	}
+
+	return 0;
+}
+
+static void qcom_qmp_phy_typec_unregister(struct qcom_qmp *qmp)
+{
+	typec_mux_unregister(qmp->mux);
+	typec_switch_unregister(qmp->sw);
+}
+#else
+static int qcom_qmp_phy_typec_register(struct qcom_qmp *qmp,
+				       const struct qmp_phy_cfg *cfg)
+{
+	return 0;
+}
+
+static void qcom_qmp_phy_typec_unregister(struct qcom_qmp *qmp)
+{
+}
+#endif
+
 static int qcom_qmp_phy_probe(struct platform_device *pdev)
 {
 	struct qcom_qmp *qmp;
@@ -5891,7 +6010,15 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	num = of_get_available_child_count(dev->of_node);
+	ret = qcom_qmp_phy_typec_register(qmp, cfg);
+	if (ret)
+		return ret;
+
+	num = 0;
+	for_each_available_child_of_node(dev->of_node, child) {
+		if (!of_node_name_eq(child, "port"))
+			num++;
+	}
 	/* do we have a rogue child node ? */
 	if (num > expected_phys)
 		return -EINVAL;
@@ -5918,6 +6045,9 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
 			serdes = usb_serdes;
 		}
 
+		if (of_node_name_eq(child, "port"))
+			continue;
+
 		/* Create per-lane phy */
 		ret = qcom_qmp_phy_create(dev, child, id, serdes, cfg);
 		if (ret) {
@@ -5962,8 +6092,18 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int qcom_qmp_phy_remove(struct platform_device *pdev)
+{
+	struct qcom_qmp *qmp = platform_get_drvdata(pdev);
+
+	qcom_qmp_phy_typec_unregister(qmp);
+
+	return 0;
+}
+
 static struct platform_driver qcom_qmp_phy_driver = {
 	.probe		= qcom_qmp_phy_probe,
+	.remove		= qcom_qmp_phy_remove,
 	.driver = {
 		.name	= "qcom-qmp-phy",
 		.pm	= &qcom_qmp_phy_pm_ops,
-- 
2.33.1

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