[PATCH v5 2/6] qcom: pmic_glink_altmode: add retimer-switch support

From: Neil Armstrong
Date: Mon Jun 19 2023 - 04:08:08 EST


Some boards have a retimer/redriver between the SuperSpeed
PHY and the USB-C connector to compensates signal integrity
losses mainly due to PCB & transmission cables.

Add support for an optional retimer-switch in the USB-C
connector graph.

Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
---
drivers/soc/qcom/pmic_glink_altmode.c | 43 +++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)

diff --git a/drivers/soc/qcom/pmic_glink_altmode.c b/drivers/soc/qcom/pmic_glink_altmode.c
index 007d308e2f15..41d732f5b647 100644
--- a/drivers/soc/qcom/pmic_glink_altmode.c
+++ b/drivers/soc/qcom/pmic_glink_altmode.c
@@ -15,6 +15,7 @@
#include <linux/usb/typec_altmode.h>
#include <linux/usb/typec_dp.h>
#include <linux/usb/typec_mux.h>
+#include <linux/usb/typec_retimer.h>

#include <linux/soc/qcom/pmic_glink.h>

@@ -68,6 +69,8 @@ struct pmic_glink_altmode_port {
struct typec_switch *typec_switch;
struct typec_mux *typec_mux;
struct typec_mux_state state;
+ struct typec_retimer *typec_retimer;
+ struct typec_retimer_state retimer_state;
struct typec_altmode dp_alt;

struct work_struct work;
@@ -157,6 +160,14 @@ static void pmic_glink_altmode_enable_dp(struct pmic_glink_altmode *altmode,
ret = typec_mux_set(port->typec_mux, &port->state);
if (ret)
dev_err(altmode->dev, "failed to switch mux to DP\n");
+
+ port->retimer_state.alt = &port->dp_alt;
+ port->retimer_state.data = &dp_data;
+ port->retimer_state.mode = TYPEC_MODAL_STATE(mode);
+
+ ret = typec_retimer_set(port->typec_retimer, &port->retimer_state);
+ if (ret)
+ dev_err(altmode->dev, "failed to setup retimer to DP\n");
}

static void pmic_glink_altmode_enable_usb(struct pmic_glink_altmode *altmode,
@@ -171,6 +182,14 @@ static void pmic_glink_altmode_enable_usb(struct pmic_glink_altmode *altmode,
ret = typec_mux_set(port->typec_mux, &port->state);
if (ret)
dev_err(altmode->dev, "failed to switch mux to USB\n");
+
+ port->retimer_state.alt = NULL;
+ port->retimer_state.data = NULL;
+ port->retimer_state.mode = TYPEC_STATE_USB;
+
+ ret = typec_retimer_set(port->typec_retimer, &port->retimer_state);
+ if (ret)
+ dev_err(altmode->dev, "failed to setup retimer to USB\n");
}

static void pmic_glink_altmode_safe(struct pmic_glink_altmode *altmode,
@@ -185,6 +204,14 @@ static void pmic_glink_altmode_safe(struct pmic_glink_altmode *altmode,
ret = typec_mux_set(port->typec_mux, &port->state);
if (ret)
dev_err(altmode->dev, "failed to switch mux to safe mode\n");
+
+ port->retimer_state.alt = NULL;
+ port->retimer_state.data = NULL;
+ port->retimer_state.mode = TYPEC_STATE_SAFE;
+
+ ret = typec_retimer_set(port->typec_retimer, &port->retimer_state);
+ if (ret)
+ dev_err(altmode->dev, "failed to setup retimer to USB\n");
}

static void pmic_glink_altmode_worker(struct work_struct *work)
@@ -347,6 +374,11 @@ static const struct drm_bridge_funcs pmic_glink_altmode_bridge_funcs = {
.attach = pmic_glink_altmode_attach,
};

+static void pmic_glink_altmode_put_retimer(void *data)
+{
+ typec_retimer_put(data);
+}
+
static void pmic_glink_altmode_put_mux(void *data)
{
typec_mux_put(data);
@@ -453,6 +485,17 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
if (ret)
return ret;

+ alt_port->typec_retimer = fwnode_typec_retimer_get(fwnode);
+ if (IS_ERR(alt_port->typec_retimer))
+ return dev_err_probe(dev, PTR_ERR(alt_port->typec_retimer),
+ "failed to acquire retimer-switch for port: %d\n",
+ port);
+
+ ret = devm_add_action_or_reset(dev, pmic_glink_altmode_put_retimer,
+ alt_port->typec_retimer);
+ if (ret)
+ return ret;
+
alt_port->typec_switch = fwnode_typec_switch_get(fwnode);
if (IS_ERR(alt_port->typec_switch))
return dev_err_probe(dev, PTR_ERR(alt_port->typec_switch),

--
2.34.1