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Commit a44769b4 authored by Linus Walleij's avatar Linus Walleij Committed by Rob Clark
Browse files

drm/msm/hdmi: Convert to use GPIO descriptors 



This switches the MSM HDMI code to use GPIO descriptors.
Normally we would fetch the GPIOs from the device with the
flags GPIOD_IN or GPIOD_OUT_[LOW|HIGH] to set up the lines
immediately, but since the code seems eager to actively
drive the lines high/low when turning HDMI on and off, we
just fetch the GPIOs as-is and keep the code explicitly
driving them.

The old code would try legacy bindings (GPIOs without any
"-gpios" suffix) but this has been moved to the gpiolib
as a quirk by the previous patch.

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarRob Clark <robdclark@chromium.org>
parent 86fe3f54

drivers/gpu/drm/msm/hdmi/hdmi.c

+31 −35
Original line number Diff line number Diff line
@@ -425,38 +425,6 @@ static const struct { 
	{ "qcom,hdmi-tx-mux-lpm", true, 1, "HDMI_MUX_LPM" },

};



static int msm_hdmi_get_gpio(struct device_node *of_node, const char *name)

{

	int gpio;



	/* try with the gpio names as in the table (downstream bindings) */

	gpio = of_get_named_gpio(of_node, name, 0);

	if (gpio < 0) {

		char name2[32];



		/* try with the gpio names as in the upstream bindings */

		snprintf(name2, sizeof(name2), "%s-gpios", name);

		gpio = of_get_named_gpio(of_node, name2, 0);

		if (gpio < 0) {

			char name3[32];



			/*

			 * try again after stripping out the "qcom,hdmi-tx"

			 * prefix. This is mainly to match "hpd-gpios" used

			 * in the upstream bindings

			 */

			if (sscanf(name2, "qcom,hdmi-tx-%s", name3))

				gpio = of_get_named_gpio(of_node, name3, 0);

		}



		if (gpio < 0) {

			DBG("failed to get gpio: %s (%d)", name, gpio);

			gpio = -1;

		}

	}

	return gpio;

}



/*

 * HDMI audio codec callbacks

 */
@@ -582,11 +550,39 @@ static int msm_hdmi_bind(struct device *dev, struct device *master, void *data) 
	hdmi_cfg->qfprom_mmio_name = "qfprom_physical";



	for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {

		hdmi_cfg->gpios[i].num = msm_hdmi_get_gpio(of_node,

						msm_hdmi_gpio_pdata[i].name);

		const char *name = msm_hdmi_gpio_pdata[i].name;

		struct gpio_desc *gpiod;



		/*

		 * We are fetching the GPIO lines "as is" since the connector

		 * code is enabling and disabling the lines. Until that point

		 * the power-on default value will be kept.

		 */

		gpiod = devm_gpiod_get_optional(dev, name, GPIOD_ASIS);

		/* This will catch e.g. -PROBE_DEFER */

		if (IS_ERR(gpiod))

			return PTR_ERR(gpiod);

		if (!gpiod) {

			/* Try a second time, stripping down the name */

			char name3[32];



			/*

			 * Try again after stripping out the "qcom,hdmi-tx"

			 * prefix. This is mainly to match "hpd-gpios" used

			 * in the upstream bindings.

			 */

			if (sscanf(name, "qcom,hdmi-tx-%s", name3))

				gpiod = devm_gpiod_get_optional(dev, name3, GPIOD_ASIS);

			if (IS_ERR(gpiod))

				return PTR_ERR(gpiod);

			if (!gpiod)

				DBG("failed to get gpio: %s", name);

		}

		hdmi_cfg->gpios[i].gpiod = gpiod;

		if (gpiod)

			gpiod_set_consumer_name(gpiod, msm_hdmi_gpio_pdata[i].label);

		hdmi_cfg->gpios[i].output = msm_hdmi_gpio_pdata[i].output;

		hdmi_cfg->gpios[i].value = msm_hdmi_gpio_pdata[i].value;

		hdmi_cfg->gpios[i].label = msm_hdmi_gpio_pdata[i].label;

	}



	dev->platform_data = hdmi_cfg;

drivers/gpu/drm/msm/hdmi/hdmi.h

+2 −2
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/clk.h>

#include <linux/platform_device.h>

#include <linux/regulator/consumer.h>

#include <linux/gpio/consumer.h>

#include <linux/hdmi.h>



#include "msm_drv.h"
@@ -22,10 +23,9 @@ struct hdmi_phy; 
struct hdmi_platform_config;



struct hdmi_gpio_data {

	int num;

	struct gpio_desc *gpiod;

	bool output;

	int value;

	const char *label;

};



struct hdmi_audio {

drivers/gpu/drm/msm/hdmi/hdmi_connector.c

+12 −30
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
 */



#include <linux/delay.h>

#include <linux/gpio.h>

#include <linux/gpio/consumer.h>

#include <linux/pinctrl/consumer.h>



#include "msm_kms.h"
@@ -69,29 +69,20 @@ static void msm_hdmi_phy_reset(struct hdmi *hdmi) 


static int gpio_config(struct hdmi *hdmi, bool on)

{

	struct device *dev = &hdmi->pdev->dev;

	const struct hdmi_platform_config *config = hdmi->config;

	int ret, i;

	int i;



	if (on) {

		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {

			struct hdmi_gpio_data gpio = config->gpios[i];



			if (gpio.num != -1) {

				ret = gpio_request(gpio.num, gpio.label);

				if (ret) {

					DRM_DEV_ERROR(dev,

						"'%s'(%d) gpio_request failed: %d\n",

						gpio.label, gpio.num, ret);

					goto err;

				}



			if (gpio.gpiod) {

				if (gpio.output) {

					gpio_direction_output(gpio.num,

					gpiod_direction_output(gpio.gpiod,

							       gpio.value);

				} else {

					gpio_direction_input(gpio.num);

					gpio_set_value_cansleep(gpio.num,

					gpiod_direction_input(gpio.gpiod);

					gpiod_set_value_cansleep(gpio.gpiod,

								 gpio.value);

				}

			}
@@ -102,29 +93,20 @@ static int gpio_config(struct hdmi *hdmi, bool on) 
		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {

			struct hdmi_gpio_data gpio = config->gpios[i];



			if (gpio.num == -1)

			if (!gpio.gpiod)

				continue;



			if (gpio.output) {

				int value = gpio.value ? 0 : 1;



				gpio_set_value_cansleep(gpio.num, value);

				gpiod_set_value_cansleep(gpio.gpiod, value);

			}



			gpio_free(gpio.num);

		};



		DBG("gpio off");

	}



	return 0;

err:

	while (i--) {

		if (config->gpios[i].num != -1)

			gpio_free(config->gpios[i].num);

	}



	return ret;

}



static void enable_hpd_clocks(struct hdmi *hdmi, bool enable)
@@ -312,7 +294,7 @@ static enum drm_connector_status detect_gpio(struct hdmi *hdmi) 
	const struct hdmi_platform_config *config = hdmi->config;

	struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];



	return gpio_get_value(hpd_gpio.num) ?

	return gpiod_get_value(hpd_gpio.gpiod) ?

			connector_status_connected :

			connector_status_disconnected;

}
@@ -331,7 +313,7 @@ static enum drm_connector_status hdmi_connector_detect( 
	 * some platforms may not have hpd gpio. Rely only on the status

	 * provided by REG_HDMI_HPD_INT_STATUS in this case.

	 */

	if (hpd_gpio.num == -1)

	if (!hpd_gpio.gpiod)

		return detect_reg(hdmi);



	do {