linux-kernel - [PATCHv3 2/2] drm: atmel-hlcdc: Add pinctrl PM select sleep,default state in CRTC suspend/resume

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Date:	Sun, 22 Feb 2015 18:51:04 +0100
From:	Sylvain Rochet <sylvain.rochet@...secur.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel@...ll.ch>,
	Kevin Hilman <khilman@...nel.org>,
	Wenyou Yang <wenyou.yang@...el.com>,
	Andrzej Hajda <a.hajda@...sung.com>
Cc:	Sylvain Rochet <sylvain.rochet@...secur.com>
Subject: [PATCHv3 2/2] 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@...secur.com>
Acked-by: Boris Brezillon <boris.brezillon@...e-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);
-- 
2.1.4

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