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drm/omap: displays: encoder-tpd12s015: Support for hot plug detection 

Use interrupt handler for hpd GPIO to react to HPD changes.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Peter Ujfalusi 2017-06-02 15:26:37 +03:00 committed by Tomi Valkeinen
parent c9741b4379
commit 232ce608ff
1 changed files with 81 additions and 0 deletions
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81
drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c
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@ -15,12 +15,17 @@
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>
#include <linux/mutex.h>
#include "../dss/omapdss.h"
struct panel_drv_data {
struct omap_dss_device dssdev;
struct omap_dss_device *in;
void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
void *hpd_cb_data;
bool hpd_enabled;
struct mutex hpd_lock;
struct gpio_desc *ct_cp_hpd_gpio;
struct gpio_desc *ls_oe_gpio;
@ -162,6 +167,49 @@ static bool tpd_detect(struct omap_dss_device *dssdev)
return gpiod_get_value_cansleep(ddata->hpd_gpio);
}
static int tpd_register_hpd_cb(struct omap_dss_device *dssdev,
void (*cb)(void *cb_data,
enum drm_connector_status status),
void *cb_data)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
mutex_lock(&ddata->hpd_lock);
ddata->hpd_cb = cb;
ddata->hpd_cb_data = cb_data;
mutex_unlock(&ddata->hpd_lock);
return 0;
}
static void tpd_unregister_hpd_cb(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
mutex_lock(&ddata->hpd_lock);
ddata->hpd_cb = NULL;
ddata->hpd_cb_data = NULL;
mutex_unlock(&ddata->hpd_lock);
}
static void tpd_enable_hpd(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
mutex_lock(&ddata->hpd_lock);
ddata->hpd_enabled = true;
mutex_unlock(&ddata->hpd_lock);
}
static void tpd_disable_hpd(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
mutex_lock(&ddata->hpd_lock);
ddata->hpd_enabled = false;
mutex_unlock(&ddata->hpd_lock);
}
static int tpd_set_infoframe(struct omap_dss_device *dssdev,
const struct hdmi_avi_infoframe *avi)
{
@ -193,10 +241,34 @@ static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
.read_edid = tpd_read_edid,
.detect = tpd_detect,
.register_hpd_cb = tpd_register_hpd_cb,
.unregister_hpd_cb = tpd_unregister_hpd_cb,
.enable_hpd = tpd_enable_hpd,
.disable_hpd = tpd_disable_hpd,
.set_infoframe = tpd_set_infoframe,
.set_hdmi_mode = tpd_set_hdmi_mode,
};
static irqreturn_t tpd_hpd_isr(int irq, void *data)
{
struct panel_drv_data *ddata = data;
mutex_lock(&ddata->hpd_lock);
if (ddata->hpd_enabled && ddata->hpd_cb) {
enum drm_connector_status status;
if (tpd_detect(&ddata->dssdev))
status = connector_status_connected;
else
status = connector_status_disconnected;
ddata->hpd_cb(ddata->hpd_cb_data, status);
}
mutex_unlock(&ddata->hpd_lock);
return IRQ_HANDLED;
}
static int tpd_probe_of(struct platform_device *pdev)
{
struct panel_drv_data *ddata = platform_get_drvdata(pdev);
@ -261,6 +333,15 @@ static int tpd_probe(struct platform_device *pdev)
ddata->hpd_gpio = gpio;
mutex_init(&ddata->hpd_lock);
r = devm_request_threaded_irq(&pdev->dev, gpiod_to_irq(ddata->hpd_gpio),
NULL, tpd_hpd_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"tpd12s015 hpd", ddata);
if (r)
goto err_gpio;
dssdev = &ddata->dssdev;
dssdev->ops.hdmi = &tpd_hdmi_ops;
dssdev->dev = &pdev->dev;