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soc: qcom: pmic_glink_altmode: add retimer-switch support

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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@linaro.org>
Link: https://lore.kernel.org/r/20230601-topic-sm8550-upstream-type-c-v5-2-9221cd300903@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Neil Armstrong 2023-06-19 10:07:14 +02:00 committed by Bjorn Andersson
parent 1beecfe68f
commit 0549bc385f
1 changed files with 43 additions and 0 deletions
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43
drivers/soc/qcom/pmic_glink_altmode.c
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@ -16,6 +16,7 @@
#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>
@ -69,6 +70,8 @@ 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;
@ -158,6 +161,14 @@ 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,
@ -172,6 +183,14 @@ 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,
@ -186,6 +205,14 @@ 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)
@ -348,6 +375,11 @@ 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);
@ -454,6 +486,17 @@ 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),