phy: qcom: qmp-usbc: add support for the Type-C handling

The USB-C PHYs on the msm8998, QCM2290 and SM6115 platforms use special
register to control which lanes of the Type-C port are used for the
SuperSpeed USB connection. Mimic the qmp-combo driver and handle this
register.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240113-pmi632-typec-v2-12-182d9aa0a5b3@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-usbc.c b/drivers/phy/qualcomm/phy-qcom-qmp-usbc.c
index 52f1b3f7b81ebcfb6082d9de0f3a6f5aede42f61..214cf4203de415ec21f3da58545a03cf615ddeec 100644 (file)
--- a/drivers/phy/qualcomm/phy-qcom-qmp-usbc.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-usbc.c
@@ -18,6 +18,8 @@
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>
 #include <linux/slab.h>
+#include <linux/usb/typec.h>
+#include <linux/usb/typec_mux.h>
 
 #include "phy-qcom-qmp.h"
 #include "phy-qcom-qmp-pcs-misc-v3.h"
@@ -374,11 +376,17 @@ struct qmp_usbc {
        struct reset_control_bulk_data *resets;
        struct regulator_bulk_data *vregs;
 
+       struct mutex phy_mutex;
+
        enum phy_mode mode;
+       unsigned int usb_init_count;
 
        struct phy *phy;
 
        struct clk_fixed_rate pipe_clk_fixed;
+
+       struct typec_switch_dev *sw;
+       enum typec_orientation orientation;
 };
 
 static inline void qphy_setbits(void __iomem *base, u32 offset, u32 val)
@@ -497,6 +505,7 @@ static int qmp_usbc_init(struct phy *phy)
        struct qmp_usbc *qmp = phy_get_drvdata(phy);
        const struct qmp_phy_cfg *cfg = qmp->cfg;
        void __iomem *pcs = qmp->pcs;
+       u32 val = 0;
        int ret;
 
        ret = regulator_bulk_enable(cfg->num_vregs, qmp->vregs);
@@ -523,6 +532,14 @@ static int qmp_usbc_init(struct phy *phy)
 
        qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRDN);
 
+#define SW_PORTSELECT_VAL                      BIT(0)
+#define SW_PORTSELECT_MUX                      BIT(1)
+       /* 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, qmp->pcs_misc);
+
        return 0;
 
 err_assert_reset:
@@ -620,23 +637,34 @@ static int qmp_usbc_power_off(struct phy *phy)
 
 static int qmp_usbc_enable(struct phy *phy)
 {
+       struct qmp_usbc *qmp = phy_get_drvdata(phy);
        int ret;
 
+       mutex_lock(&qmp->phy_mutex);
+
        ret = qmp_usbc_init(phy);
        if (ret)
-               return ret;
+               goto out_unlock;
 
        ret = qmp_usbc_power_on(phy);
-       if (ret)
+       if (ret) {
                qmp_usbc_exit(phy);
+               goto out_unlock;
+       }
+
+       qmp->usb_init_count++;
+out_unlock:
+       mutex_unlock(&qmp->phy_mutex);
 
        return ret;
 }
 
 static int qmp_usbc_disable(struct phy *phy)
 {
+       struct qmp_usbc *qmp = phy_get_drvdata(phy);
        int ret;
 
+       qmp->usb_init_count--;
        ret = qmp_usbc_power_off(phy);
        if (ret)
                return ret;
@@ -874,6 +902,61 @@ static int phy_pipe_clk_register(struct qmp_usbc *qmp, struct device_node *np)
        return devm_add_action_or_reset(qmp->dev, phy_clk_release_provider, np);
 }
 
+#if IS_ENABLED(CONFIG_TYPEC)
+static int qmp_usbc_typec_switch_set(struct typec_switch_dev *sw,
+                                     enum typec_orientation orientation)
+{
+       struct qmp_usbc *qmp = typec_switch_get_drvdata(sw);
+
+       if (orientation == qmp->orientation || orientation == TYPEC_ORIENTATION_NONE)
+               return 0;
+
+       mutex_lock(&qmp->phy_mutex);
+       qmp->orientation = orientation;
+
+       if (qmp->usb_init_count) {
+               qmp_usbc_power_off(qmp->phy);
+               qmp_usbc_exit(qmp->phy);
+
+               qmp_usbc_init(qmp->phy);
+               qmp_usbc_power_on(qmp->phy);
+       }
+
+       mutex_unlock(&qmp->phy_mutex);
+
+       return 0;
+}
+
+static void qmp_usbc_typec_unregister(void *data)
+{
+       struct qmp_usbc *qmp = data;
+
+       typec_switch_unregister(qmp->sw);
+}
+
+static int qmp_usbc_typec_switch_register(struct qmp_usbc *qmp)
+{
+       struct typec_switch_desc sw_desc = {};
+       struct device *dev = qmp->dev;
+
+       sw_desc.drvdata = qmp;
+       sw_desc.fwnode = dev->fwnode;
+       sw_desc.set = qmp_usbc_typec_switch_set;
+       qmp->sw = typec_switch_register(dev, &sw_desc);
+       if (IS_ERR(qmp->sw)) {
+               dev_err(dev, "Unable to register typec switch: %pe\n", qmp->sw);
+               return PTR_ERR(qmp->sw);
+       }
+
+       return devm_add_action_or_reset(dev, qmp_usbc_typec_unregister, qmp);
+}
+#else
+static int qmp_usbc_typec_switch_register(struct qmp_usbc *qmp)
+{
+       return 0;
+}
+#endif
+
 static int qmp_usbc_parse_dt_legacy(struct qmp_usbc *qmp, struct device_node *np)
 {
        struct platform_device *pdev = to_platform_device(qmp->dev);
@@ -994,16 +1077,24 @@ static int qmp_usbc_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;
 
+       mutex_init(&qmp->phy_mutex);
+
        ret = qmp_usbc_vreg_init(qmp);
        if (ret)
                return ret;
 
+       ret = qmp_usbc_typec_switch_register(qmp);
+       if (ret)
+               return ret;
+
        /* Check for legacy binding with child node. */
-       np = of_get_next_available_child(dev->of_node, NULL);
+       np = of_get_child_by_name(dev->of_node, "phy");
        if (np) {
                ret = qmp_usbc_parse_dt_legacy(qmp, np);
        } else {