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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2016-03-21 21:10:26 (GMT) |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2016-06-06 07:14:28 (GMT) |
| commit | e2513b3f568332dcecd0bfe51a1f4b2abcc4ccee (patch) | |
| tree | 4e4af0b189258117c18338a50e9d706dc17d9095 /drivers/gpu/drm/omapdrm | |
| parent | 24fe2386818682ae7503a2bc210f0baa4d9902ab (diff) | |
| download | linux-e2513b3f568332dcecd0bfe51a1f4b2abcc4ccee.tar.xz | |
drm/omap: panel-dpi: make (limited) use of a reset gpio
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>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/gpu/drm/omapdrm')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/displays/panel-dpi.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dpi.c b/drivers/gpu/drm/omapdrm/displays/panel-dpi.c index 7c2331b..9dc1c2f 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); |