drm/panel: simple: Allow GPIO accesses to sleep

The enable GPIO for panels may be provided by GPIO expanders on slow
busses (such as I2C), and therefore toggling the GPIO may sleep. Since
these accesses don't happen in interrupt context, use the *_cansleep()
variants of the GPIO API.

Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 71566d82e4828a332ede423bca953738e51204ef..789c0793799072aecbf5fb10b852719bfa1425cb 100644 (file)
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -106,7 +106,7 @@ static int panel_simple_disable(struct drm_panel *panel)
        }
 
        if (p->enable_gpio)
-               gpiod_set_value(p->enable_gpio, 0);
+               gpiod_set_value_cansleep(p->enable_gpio, 0);
 
        regulator_disable(p->supply);
        p->enabled = false;
@@ -129,7 +129,7 @@ static int panel_simple_enable(struct drm_panel *panel)
        }
 
        if (p->enable_gpio)
-               gpiod_set_value(p->enable_gpio, 1);
+               gpiod_set_value_cansleep(p->enable_gpio, 1);
 
        if (p->backlight) {
                p->backlight->props.power = FB_BLANK_UNBLANK;