[PATCH v3 2/2] drm/mediatek: control panel's power before MIPI LP11

[Jitao Shi]

"auo,kd101n80-45na" requires the panel's IOVDD take precedence over
MIPI DATA. Otherwise there is a risk of leakage.

Signed-off-by: Jitao Shi <jitao....@mediatek.com>
Change-Id: I2da6179dea7e15bc5a53fe36db200b6c04f4d551
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c 
b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 93b40c245f00..9fff0c483139 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -24,7 +24,7 @@
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>
-
+#include <drm/panel_boe_tv101wum_nl6.h>
 #include "mtk_disp_drv.h"
 #include "mtk_drm_ddp_comp.h"
 
@@ -185,6 +185,7 @@ struct mtk_dsi {
        struct drm_bridge bridge;
        struct drm_bridge *next_bridge;
        struct drm_connector *connector;
+       struct drm_panel *panel;
        struct phy *phy;
 
        void __iomem *regs;
@@ -619,10 +620,16 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
        dsi->data_rate = DIV_ROUND_UP_ULL(dsi->vm.pixelclock * bit_per_pixel,
                                          dsi->lanes);
 
+       if (dsi->panel) {
+               if (panel_prepare_power(dsi->panel)) {
+                       DRM_INFO("can't prepare power the panel\n");
+                       goto err_refcount;
+               }
+       }
        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);
@@ -665,6 +672,11 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
        clk_disable_unprepare(dsi->engine_clk);
 err_phy_power_off:
        phy_power_off(dsi->phy);
+err_prepare_power:
+       if (dsi->panel) {
+               if (panel_unprepare_power(dsi->panel))
+                       DRM_INFO("Can't unprepare power the panel\n");
+       }
 err_refcount:
        dsi->refcount--;
        return ret;
@@ -698,6 +710,11 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
        clk_disable_unprepare(dsi->digital_clk);
 
        phy_power_off(dsi->phy);
+
+       if (dsi->panel) {
+               if (panel_unprepare_power(dsi->panel))
+                       DRM_INFO("Can't unprepare power the panel\n");
+       }
 }
 
 static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
@@ -1001,7 +1018,6 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 {
        struct mtk_dsi *dsi;
        struct device *dev = &pdev->dev;
-       struct drm_panel *panel;
        struct resource *regs;
        int irq_num;
        int ret;
@@ -1019,12 +1035,12 @@ static int mtk_dsi_probe(struct platform_device *pdev)
        }
 
        ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
-                                         &panel, &dsi->next_bridge);
+                                         &dsi->panel, &dsi->next_bridge);
        if (ret)
                goto err_unregister_host;
 
-       if (panel) {
-               dsi->next_bridge = devm_drm_panel_bridge_add(dev, panel);
+       if (dsi->panel) {
+               dsi->next_bridge = devm_drm_panel_bridge_add(dev, dsi->panel);
                if (IS_ERR(dsi->next_bridge)) {
                        ret = PTR_ERR(dsi->next_bridge);
                        goto err_unregister_host;
-- 
2.12.5