Commit fb36d0ee authored by Thierry Reding's avatar Thierry Reding
Browse files

drm/tegra: output: Support low-active hotplug detect 



Support low-active hotplug detect signals by storing the GPIO flags
parsed from device tree.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent a13f1dc4

drivers/gpu/drm/tegra/drm.h

+2 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 


#include <uapi/drm/tegra_drm.h>

#include <linux/host1x.h>

#include <linux/of_gpio.h>



#include <drm/drmP.h>

#include <drm/drm_crtc_helper.h>
@@ -200,6 +201,7 @@ struct tegra_output { 
	const struct edid *edid;

	unsigned int hpd_irq;

	int hpd_gpio;

	enum of_gpio_flags hpd_gpio_flags;



	struct drm_encoder encoder;

	struct drm_connector connector;

drivers/gpu/drm/tegra/output.c

+12 −8
Original line number Diff line number Diff line
@@ -7,8 +7,6 @@ 
 * published by the Free Software Foundation.

 */



#include <linux/of_gpio.h>



#include <drm/drm_atomic_helper.h>

#include <drm/drm_panel.h>

#include "drm.h"
@@ -59,10 +57,17 @@ tegra_output_connector_detect(struct drm_connector *connector, bool force) 
	enum drm_connector_status status = connector_status_unknown;



	if (gpio_is_valid(output->hpd_gpio)) {

		if (output->hpd_gpio_flags & OF_GPIO_ACTIVE_LOW) {

			if (gpio_get_value(output->hpd_gpio) != 0)

				status = connector_status_disconnected;

			else

				status = connector_status_connected;

		} else {

			if (gpio_get_value(output->hpd_gpio) == 0)

				status = connector_status_disconnected;

			else

				status = connector_status_connected;

		}

	} else {

		if (!output->panel)

			status = connector_status_disconnected;
@@ -97,7 +102,6 @@ static irqreturn_t hpd_irq(int irq, void *data) 
int tegra_output_probe(struct tegra_output *output)

{

	struct device_node *ddc, *panel;

	enum of_gpio_flags flags;

	int err, size;



	if (!output->of_node)
@@ -128,7 +132,7 @@ int tegra_output_probe(struct tegra_output *output) 


	output->hpd_gpio = of_get_named_gpio_flags(output->of_node,

						   "nvidia,hpd-gpio", 0,

						   &flags);

						   &output->hpd_gpio_flags);

	if (gpio_is_valid(output->hpd_gpio)) {

		unsigned long flags;