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drm/omap: add HPD support to connector-dvi

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Add HPD support to the DVI connector driver. The code is almost
identical to the HPD code in the HDMI connector driver.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Tomi Valkeinen 2017-12-15 16:08:23 +02:00
parent da77772172
commit 588fd85d27
1 changed files with 118 additions and 0 deletions
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118
drivers/gpu/drm/omapdrm/displays/connector-dvi.c
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@ -9,6 +9,7 @@
* the Free Software Foundation.
*/
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_device.h>
@ -44,6 +45,14 @@ struct panel_drv_data {
struct videomode vm;
struct i2c_adapter *i2c_adapter;
struct gpio_desc *hpd_gpio;
void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
void *hpd_cb_data;
bool hpd_enabled;
/* mutex for hpd fields above */
struct mutex hpd_lock;
};
#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
@ -189,6 +198,9 @@ static int dvic_read_edid(struct omap_dss_device *dssdev,
struct panel_drv_data *ddata = to_panel_data(dssdev);
int r, l, bytes_read;
if (ddata->hpd_gpio && !gpiod_get_value_cansleep(ddata->hpd_gpio))
return -ENODEV;
if (!ddata->i2c_adapter)
return -ENODEV;
@ -220,6 +232,9 @@ static bool dvic_detect(struct omap_dss_device *dssdev)
unsigned char out;
int r;
if (ddata->hpd_gpio)
return gpiod_get_value_cansleep(ddata->hpd_gpio);
if (!ddata->i2c_adapter)
return true;
@ -228,6 +243,60 @@ static bool dvic_detect(struct omap_dss_device *dssdev)
return r == 0;
}
static int dvic_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);
if (!ddata->hpd_gpio)
return -ENOTSUPP;
mutex_lock(&ddata->hpd_lock);
ddata->hpd_cb = cb;
ddata->hpd_cb_data = cb_data;
mutex_unlock(&ddata->hpd_lock);
return 0;
}
static void dvic_unregister_hpd_cb(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
if (!ddata->hpd_gpio)
return;
mutex_lock(&ddata->hpd_lock);
ddata->hpd_cb = NULL;
ddata->hpd_cb_data = NULL;
mutex_unlock(&ddata->hpd_lock);
}
static void dvic_enable_hpd(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
if (!ddata->hpd_gpio)
return;
mutex_lock(&ddata->hpd_lock);
ddata->hpd_enabled = true;
mutex_unlock(&ddata->hpd_lock);
}
static void dvic_disable_hpd(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
if (!ddata->hpd_gpio)
return;
mutex_lock(&ddata->hpd_lock);
ddata->hpd_enabled = false;
mutex_unlock(&ddata->hpd_lock);
}
static struct omap_dss_driver dvic_driver = {
.connect = dvic_connect,
.disconnect = dvic_disconnect,
@ -241,14 +310,60 @@ static struct omap_dss_driver dvic_driver = {
.read_edid = dvic_read_edid,
.detect = dvic_detect,
.register_hpd_cb = dvic_register_hpd_cb,
.unregister_hpd_cb = dvic_unregister_hpd_cb,
.enable_hpd = dvic_enable_hpd,
.disable_hpd = dvic_disable_hpd,
};
static irqreturn_t dvic_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 (dvic_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 dvic_probe_of(struct platform_device *pdev)
{
struct panel_drv_data *ddata = platform_get_drvdata(pdev);
struct device_node *node = pdev->dev.of_node;
struct device_node *adapter_node;
struct i2c_adapter *adapter;
struct gpio_desc *gpio;
int r;
gpio = devm_gpiod_get_optional(&pdev->dev, "hpd", GPIOD_IN);
if (IS_ERR(gpio)) {
dev_err(&pdev->dev, "failed to parse HPD gpio\n");
return PTR_ERR(gpio);
}
ddata->hpd_gpio = gpio;
mutex_init(&ddata->hpd_lock);
if (ddata->hpd_gpio) {
r = devm_request_threaded_irq(&pdev->dev,
gpiod_to_irq(ddata->hpd_gpio), NULL, dvic_hpd_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"DVI HPD", ddata);
if (r)
return r;
}
adapter_node = of_parse_phandle(node, "ddc-i2c-bus", 0);
if (adapter_node) {
@ -300,6 +415,7 @@ static int dvic_probe(struct platform_device *pdev)
err_reg:
i2c_put_adapter(ddata->i2c_adapter);
mutex_destroy(&ddata->hpd_lock);
return r;
}
@ -316,6 +432,8 @@ static int __exit dvic_remove(struct platform_device *pdev)
i2c_put_adapter(ddata->i2c_adapter);
mutex_destroy(&ddata->hpd_lock);
return 0;
}