linux-kernel - [PATCH] drm/msm: add calls to prepare and unprepare panel

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Date:	Mon, 27 Jul 2015 15:12:39 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	robdclark@...il.com, dri-devel@...ts.freedesktop.org
Cc:	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH] drm/msm: add calls to prepare and unprepare panel

Prepare the panel before it's enabled and un-prepare after disable, this
will make sure that the regulators are switched on and off correctly.

Tested it on APQ8064 based IFC6410 with panel.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_lcdc_encoder.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_lcdc_encoder.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_lcdc_encoder.c
index c048433..4cd6e72 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_lcdc_encoder.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_lcdc_encoder.c
@@ -346,8 +346,10 @@ static void mdp4_lcdc_encoder_disable(struct drm_encoder *encoder)
 
 	mdp4_write(mdp4_kms, REG_MDP4_LCDC_ENABLE, 0);
 
-	if (panel)
+	if (panel) {
 		drm_panel_disable(panel);
+		drm_panel_unprepare(panel);
+	}
 
 	/*
 	 * Wait for a vsync so we know the ENABLE=0 latched before
@@ -412,8 +414,10 @@ static void mdp4_lcdc_encoder_enable(struct drm_encoder *encoder)
 	if (ret)
 		dev_err(dev->dev, "failed to enable lcdc_clk: %d\n", ret);
 
-	if (panel)
+	if (panel) {
+		drm_panel_prepare(panel);
 		drm_panel_enable(panel);
+	}
 
 	setup_phy(encoder);
 
-- 
1.9.1

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