From: Sylvain Rochet <sylvain.rochet@finsecur.com>
Date: Sun, 22 Feb 2015 17:51:04 +0000 (+0100)
Subject: drm: atmel-hlcdc: Add pinctrl PM select sleep,default state in CRTC suspend/resume
X-Git-Tag: firefly_0821_release~176^2~1915^2~36^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=16e6004eb7a8686bae526ab9ea22c94ec901897b;p=firefly-linux-kernel-4.4.55.git

drm: atmel-hlcdc: Add pinctrl PM select sleep,default state in CRTC suspend/resume

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>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
index a120246474e4..b81cea6baeea 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>
@@ -157,6 +158,7 @@ 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);
 
@@ -179,6 +181,7 @@ 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);