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drm/omap: panel-tpo-td028ttec1: add backlight support 

This panel has a backlight, so fetch it from devicetree using the
corresponding property as documented in panel-common.txt. It is
implemented the same way as in panel-dpi.c
This ensures the backlight is also disabled when the display is
turned off like when doing xset dpms force off.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Andreas Kemnade 2019-02-05 07:38:12 +01:00 committed by Tomi Valkeinen
parent fe4ed1b457
commit b477a009b4
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c
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@ -35,6 +35,8 @@ struct panel_drv_data {
struct videomode vm;
struct backlight_device *backlight;
struct spi_device *spi_dev;
};
@ -258,12 +260,16 @@ static void td028ttec1_panel_enable(struct omap_dss_device *dssdev)
if (r)
dev_err(dssdev->dev, "%s: write error\n", __func__);
backlight_enable(ddata->backlight);
}
static void td028ttec1_panel_disable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
backlight_disable(ddata->backlight);
dev_dbg(dssdev->dev, "td028ttec1_panel_disable()\n");
jbt_ret_write_0(ddata, JBT_REG_DISPLAY_OFF);
@ -311,6 +317,10 @@ static int td028ttec1_panel_probe(struct spi_device *spi)
if (ddata == NULL)
return -ENOMEM;
ddata->backlight = devm_of_find_backlight(&spi->dev);
if (IS_ERR(ddata->backlight))
return PTR_ERR(ddata->backlight);
dev_set_drvdata(&spi->dev, ddata);
ddata->spi_dev = spi;