[PATCH 1/1] drm/mediatek: fine tune the dsi panel's power sequence

[Jitao Shi]

Add the drm_panel_prepare_power and drm_panel_unprepare_power control.
Turn on panel power(drm_panel_prepare_power) and control before dsi
enable. And then dsi enable, send dcs cmd in drm_panel_prepare, last
turn on backlight.

Signed-off-by: Jitao Shi <jitao....@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c 
b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 224afb666881..b635724b209b 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -563,10 +563,15 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
        dsi->data_rate = DIV_ROUND_UP_ULL(pixel_clock * total_bits,
                                          htotal * dsi->lanes);
 
+       if (dsi->panel) {
+               if (drm_panel_prepare_power(dsi->panel))
+                       DRM_INFO("can't prepare power the panel\n");
+       }
+
        ret = clk_set_rate(dsi->hs_clk, dsi->data_rate);
        if (ret < 0) {
                dev_err(dev, "Failed to set data rate: %d\n", ret);
-               goto err_refcount;
+               goto err_prepare_power;
        }
 
        phy_power_on(dsi->phy);
@@ -605,13 +610,18 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
        }
 
        return 0;
+
 err_disable_digital_clk:
        clk_disable_unprepare(dsi->digital_clk);
 err_disable_engine_clk:
        clk_disable_unprepare(dsi->engine_clk);
 err_phy_power_off:
        phy_power_off(dsi->phy);
-err_refcount:
+err_prepare_power:
+       if (dsi->panel) {
+               if (drm_panel_unprepare_power(dsi->panel))
+                       DRM_INFO("Can't unprepare power the panel\n");
+       }
        dsi->refcount--;
        return ret;
 }
@@ -652,6 +662,11 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
        clk_disable_unprepare(dsi->digital_clk);
 
        phy_power_off(dsi->phy);
+
+       if (dsi->panel) {
+               if (drm_panel_unprepare_power(dsi->panel))
+                       DRM_INFO("Can't unprepare power the panel\n");
+       }
 }
 
 static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
-- 
2.21.0

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