Some displays have a reset input. To assert that the display is functional the reset gpio must be deasserted.
Teach the driver to get and drive such a gpio accordingly.
Reviewed-by: Tomi Valkeinen tomi.valkeinen@ti.com Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de --- drivers/gpu/drm/omapdrm/displays/panel-dpi.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dpi.c b/drivers/gpu/drm/omapdrm/displays/panel-dpi.c index e780fd4f8b46..201a1c1a6f42 100644 --- a/drivers/gpu/drm/omapdrm/displays/panel-dpi.c +++ b/drivers/gpu/drm/omapdrm/displays/panel-dpi.c @@ -213,6 +213,16 @@ static int panel_dpi_probe_of(struct platform_device *pdev)
ddata->enable_gpio = gpio;
+ /* + * Many different panels are supported by this driver and there are + * probably very different needs for their reset pins in regards to + * timing and order relative to the enable gpio. So for now it's just + * ensured that the reset line isn't active. + */ + gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(gpio)) + return PTR_ERR(gpio); + ddata->backlight_gpio = -ENOENT;
r = of_get_display_timing(node, "panel-timing", &timing);