diff options
| author | Rajeev Nandan <rajeevny@codeaurora.org> | 2021-06-26 19:51:05 +0300 |
|---|---|---|
| committer | Douglas Anderson <dianders@chromium.org> | 2021-07-09 16:48:05 +0300 |
| commit | 18a1488bf1e13fc3fc96d7948466b2166067c6c8 (patch) | |
| tree | e16e1b9af9453aa692da01316be73aecbbf64dbf /drivers/gpu/drm/panel | |
| parent | bfd451403d70b13d22db097e4590fa80ba2160eb (diff) | |
| download | linux-18a1488bf1e13fc3fc96d7948466b2166067c6c8.tar.xz | |
drm/panel-simple: Support for delays between GPIO & regulator
Some panels datasheets may specify a delay between the enable GPIO and
the regulator. Support this in panel-simple.
Signed-off-by: Rajeev Nandan <rajeevny@codeaurora.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1624726268-14869-4-git-send-email-rajeevny@codeaurora.org
Diffstat (limited to 'drivers/gpu/drm/panel')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-simple.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index 6f233f2a4e3d..5fc980208420 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -133,6 +133,22 @@ struct panel_desc { unsigned int prepare_to_enable; /** + * @delay.power_to_enable: Time for the power to enable the display on. + * + * The time (in milliseconds) to wait after powering up the display + * before asserting its enable pin. + */ + unsigned int power_to_enable; + + /** + * @delay.disable_to_power_off: Time for the disable to power the display off. + * + * The time (in milliseconds) to wait before powering off the display + * after deasserting its enable pin. + */ + unsigned int disable_to_power_off; + + /** * @delay.enable: Time for the panel to display a valid frame. * * The time (in milliseconds) that it takes for the panel to @@ -347,6 +363,10 @@ static int panel_simple_suspend(struct device *dev) struct panel_simple *p = dev_get_drvdata(dev); gpiod_set_value_cansleep(p->enable_gpio, 0); + + if (p->desc->delay.disable_to_power_off) + msleep(p->desc->delay.disable_to_power_off); + regulator_disable(p->supply); p->unprepared_time = ktime_get(); @@ -407,6 +427,9 @@ static int panel_simple_prepare_once(struct panel_simple *p) return err; } + if (p->desc->delay.power_to_enable) + msleep(p->desc->delay.power_to_enable); + gpiod_set_value_cansleep(p->enable_gpio, 1); delay = p->desc->delay.prepare; @@ -782,6 +805,11 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc, break; } + if (!panel->enable_gpio && desc->delay.disable_to_power_off) + dev_warn(dev, "Need a delay after disabling panel GPIO, but a GPIO wasn't provided\n"); + if (!panel->enable_gpio && desc->delay.power_to_enable) + dev_warn(dev, "Need a delay before enabling panel GPIO, but a GPIO wasn't provided\n"); + dev_set_drvdata(dev, panel); /* |