Some LCD panels have back-powering issue when un-powered, allows users to use an alternate pinctrl "sleep" in order to clamp outputs to a wanted state at suspend.

Signed-off-by: Sylvain Rochet sylvain.rochet@finsecur.com Acked-by: Boris Brezillon boris.brezillon@free-electrons.com --- drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c index 79c9a19..decd9ea 100644 --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c @@ -21,6 +21,7 @@ #include <linux/clk.h> #include <linux/pm.h> #include <linux/pm_runtime.h> +#include <linux/pinctrl/consumer.h>

#include <drm/drm_crtc.h> #include <drm/drm_crtc_helper.h> @@ -156,6 +157,7 @@ static void atmel_hlcdc_crtc_disable(struct drm_crtc *c) cpu_relax();

clk_disable_unprepare(crtc->dc->hlcdc->sys_clk); + pinctrl_pm_select_sleep_state(dev->dev);

pm_runtime_allow(dev->dev);

@@ -178,6 +180,7 @@ static void atmel_hlcdc_crtc_enable(struct drm_crtc *c)

pm_runtime_forbid(dev->dev);

+ pinctrl_pm_select_default_state(dev->dev); clk_prepare_enable(crtc->dc->hlcdc->sys_clk);

regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK);