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

[Srinivas Kandagatla]

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 at linaro.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