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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: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2015-04-27 15:12:39 +02:00
parent a13f1dc4c3
commit fb36d0eed4
2 changed files with 14 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/tegra/drm.h
View File

@ -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;

20
drivers/gpu/drm/tegra/output.c
View File

@ -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 (gpio_get_value(output->hpd_gpio) == 0)
status = connector_status_disconnected;
else
status = connector_status_connected;
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;