Re: [PATCH 01/21] OMAPDSS: panel-dvi: add PD gpio handling

Archit Taneja
2012-03-07T17:47:24Z

Hi,

On Wednesday 07 March 2012 06:14 PM, Tomi Valkeinen wrote:
> The driver for the DVI framer should handle the power-down signal of the
> framer, instead of the current way of handling it in the board files.

What does framer mean?

>
> This patch adds power_down_gpio into the device's platform data, and
> adds the necessary code in the driver to request and handle the GPIO.
>
> Signed-off-by: Tomi Valkeinen<tomi.valkeinen@ti.com>
> ---
> drivers/video/omap2/displays/panel-dvi.c | 31 ++++++++++++++++++++++++++++++
> include/video/omap-panel-dvi.h | 2 +
> 2 files changed, 33 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/video/omap2/displays/panel-dvi.c b/drivers/video/omap2/displays/panel-dvi.c
> index 03eb14a..876b798 100644
> --- a/drivers/video/omap2/displays/panel-dvi.c
> +++ b/drivers/video/omap2/displays/panel-dvi.c
> @@ -21,6 +21,7 @@
> #include<linux/slab.h>
> #include<video/omapdss.h>
> #include<linux/i2c.h>
> +#include<linux/gpio.h>
> #include<drm/drm_edid.h>
>
> #include<video/omap-panel-dvi.h>
> @@ -44,6 +45,8 @@ struct panel_drv_data {
> struct omap_dss_device *dssdev;
>
> struct mutex lock;
> +
> + int pd_gpio;
> };
>
> static inline struct panel_dvi_platform_data
> @@ -54,6 +57,7 @@ static inline struct panel_dvi_platform_data
>
> static int panel_dvi_power_on(struct omap_dss_device *dssdev)
> {
> + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
> struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
> int r;
>
> @@ -70,6 +74,9 @@ static int panel_dvi_power_on(struct omap_dss_device *dssdev)
> goto err1;
> }
>
> + if (gpio_is_valid(ddata->pd_gpio))
> + gpio_set_value(ddata->pd_gpio, 1);
> +
> return 0;
> err1:
> omapdss_dpi_display_disable(dssdev);
> @@ -79,11 +86,15 @@ err0:
>
> static void panel_dvi_power_off(struct omap_dss_device *dssdev)
> {
> + struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
> struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
>
> if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
> return;
>
> + if (gpio_is_valid(ddata->pd_gpio))
> + gpio_set_value(ddata->pd_gpio, 0);
> +
> if (pdata->platform_disable)
> pdata->platform_disable(dssdev);
>
> @@ -92,7 +103,9 @@ static void panel_dvi_power_off(struct omap_dss_device *dssdev)
>
> static int panel_dvi_probe(struct omap_dss_device *dssdev)
> {
> + struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
> struct panel_drv_data *ddata;
> + int r;
>
> ddata = kzalloc(sizeof(*ddata), GFP_KERNEL);
> if (!ddata)
> @@ -104,6 +117,21 @@ static int panel_dvi_probe(struct omap_dss_device *dssdev)
> ddata->dssdev = dssdev;
> mutex_init(&ddata->lock);
>
> + if (pdata)
> + ddata->pd_gpio = pdata->power_down_gpio;
> + else
> + ddata->pd_gpio = -1;
> +
> + if (gpio_is_valid(ddata->pd_gpio)) {
> + r = gpio_request_one(ddata->pd_gpio, GPIOF_OUT_INIT_LOW,
> + "tfp410 pd");
> + if (r) {
> + dev_err(&dssdev->dev, "Failed to request PD GPIO %d\n",
> + ddata->pd_gpio);
> + ddata->pd_gpio = -1;

Is the power down gpio not a necessary thing? If it is, we should quit
here itself, shouldn't we?

Archit

> + }
> + }
> +
> dev_set_drvdata(&dssdev->dev, ddata);
>
> return 0;
> @@ -115,6 +143,9 @@ static void __exit panel_dvi_remove(struct omap_dss_device *dssdev)
>
> mutex_lock(&ddata->lock);
>
> + if (gpio_is_valid(ddata->pd_gpio))
> + gpio_free(ddata->pd_gpio);
> +
> dev_set_drvdata(&dssdev->dev, NULL);
>
> mutex_unlock(&ddata->lock);
> diff --git a/include/video/omap-panel-dvi.h b/include/video/omap-panel-dvi.h
> index 87ad567b..4ad41fc 100644
> --- a/include/video/omap-panel-dvi.h
> +++ b/include/video/omap-panel-dvi.h
> @@ -27,11 +27,13 @@ struct omap_dss_device;
> * @platform_enable: platform specific panel enable function
> * @platform_disable: platform specific panel disable function
> * @i2c_bus_num: i2c bus id for the panel
> + * @power_down_gpio: gpio number for PD pin (or -1 if not available)
> */
> struct panel_dvi_platform_data {
> int (*platform_enable)(struct omap_dss_device *dssdev);
> void (*platform_disable)(struct omap_dss_device *dssdev);
> u16 i2c_bus_num;
> + int power_down_gpio;
> };
>
> #endif /* __OMAP_PANEL_DVI_H */