Commit 0549bc38 authored by Neil Armstrong's avatar Neil Armstrong Committed by Bjorn Andersson
Browse files

soc: qcom: pmic_glink_altmode: add retimer-switch support 



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: default avatarNeil 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: default avatarBjorn Andersson <andersson@kernel.org>
parent 1beecfe6

drivers/soc/qcom/pmic_glink_altmode.c

+43 −0
Original line number Original line Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/usb/typec_altmode.h>

#include <linux/usb/typec_altmode.h>

#include <linux/usb/typec_dp.h>

#include <linux/usb/typec_dp.h>

#include <linux/usb/typec_mux.h>

#include <linux/usb/typec_mux.h>

#include <linux/usb/typec_retimer.h>





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

#include <linux/soc/qcom/pmic_glink.h>
@@ -69,6 +70,8 @@ struct pmic_glink_altmode_port { 
	struct typec_switch *typec_switch;

	struct typec_switch *typec_switch;

	struct typec_mux *typec_mux;

	struct typec_mux *typec_mux;

	struct typec_mux_state state;

	struct typec_mux_state state;

	struct typec_retimer *typec_retimer;

	struct typec_retimer_state retimer_state;

	struct typec_altmode dp_alt;

	struct typec_altmode dp_alt;





	struct work_struct work;

	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);

	ret = typec_mux_set(port->typec_mux, &port->state);

	if (ret)

	if (ret)

		dev_err(altmode->dev, "failed to switch mux to DP\n");

		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,

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);

	ret = typec_mux_set(port->typec_mux, &port->state);

	if (ret)

	if (ret)

		dev_err(altmode->dev, "failed to switch mux to USB\n");

		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,

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);

	ret = typec_mux_set(port->typec_mux, &port->state);

	if (ret)

	if (ret)

		dev_err(altmode->dev, "failed to switch mux to safe mode\n");

		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)

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,

	.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)

static void pmic_glink_altmode_put_mux(void *data)

{

{

	typec_mux_put(data);

	typec_mux_put(data);
@@ -454,6 +486,17 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev, 
		if (ret)

		if (ret)

			return 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);

		alt_port->typec_switch = fwnode_typec_switch_get(fwnode);

		if (IS_ERR(alt_port->typec_switch))

		if (IS_ERR(alt_port->typec_switch))

			return dev_err_probe(dev, PTR_ERR(alt_port->typec_switch),

			return dev_err_probe(dev, PTR_ERR(alt_port->typec_switch),