From 7330eff9722772008a7876827a6b2f3545a70b7a Mon Sep 17 00:00:00 2001
From: Mark Yao <mark.yao@rock-chips.com>
Date: Mon, 5 Jun 2017 18:05:42 +0800
Subject: [PATCH] drm: support loader protect for panel

Change-Id: Ie9330e3380a4925a4b7603e7206f1e0d186d2156
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
---
 .../drm/bridge/analogix/analogix_dp_core.c    |  2 ++
 drivers/gpu/drm/panel/panel-simple.c          | 20 +++++++++++++++++++
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c        |  2 ++
 include/drm/drm_panel.h                       | 10 ++++++++++
 4 files changed, 34 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index ff2b881581c5..f8495cdeb8da 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -966,6 +966,8 @@ static int analogix_dp_loader_protect(struct drm_connector *connector, bool on)
 {
 	struct analogix_dp_device *dp = to_dp(connector);
 
+	if (dp->plat_data->panel)
+		drm_panel_loader_protect(dp->plat_data->panel, on);
 	if (on)
 		pm_runtime_get_sync(dp->dev);
 	else
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 20a4bb6b548c..301e2bf41384 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -330,6 +330,25 @@ static int panel_simple_of_get_native_mode(struct panel_simple *panel)
 	return 1;
 }
 
+static int panel_simple_loader_protect(struct drm_panel *panel, bool on)
+{
+	struct panel_simple *p = to_panel_simple(panel);
+	int err;
+
+	if (on) {
+		err = regulator_enable(p->supply);
+		if (err < 0) {
+			dev_err(panel->dev, "failed to enable supply: %d\n",
+				err);
+			return err;
+		}
+	} else {
+		regulator_disable(p->supply);
+	}
+
+	return 0;
+}
+
 static int panel_simple_disable(struct drm_panel *panel)
 {
 	struct panel_simple *p = to_panel_simple(panel);
@@ -486,6 +505,7 @@ static int panel_simple_get_timings(struct drm_panel *panel,
 }
 
 static const struct drm_panel_funcs panel_simple_funcs = {
+	.loader_protect = panel_simple_loader_protect,
 	.disable = panel_simple_disable,
 	.unprepare = panel_simple_unprepare,
 	.prepare = panel_simple_prepare,
diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 38e4811be728..0d29890235a0 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -1057,6 +1057,8 @@ static int dw_mipi_loader_protect(struct drm_connector *connector, bool on)
 {
 	struct dw_mipi_dsi *dsi = con_to_dsi(connector);
 
+	if (dsi->panel)
+		drm_panel_loader_protect(dsi->panel, on);
 	if (on)
 		pm_runtime_get_sync(dsi->dev);
 	else
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 13ff44b28893..083dedde7a03 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -33,6 +33,7 @@ struct display_timing;
 
 /**
  * struct drm_panel_funcs - perform operations on a given panel
+ * @loader_protect: protect loader logo panel's power
  * @disable: disable panel (turn off back light, etc.)
  * @unprepare: turn off panel
  * @prepare: turn on panel and perform set up
@@ -66,6 +67,7 @@ struct display_timing;
  * the panel. This is the job of the .unprepare() function.
  */
 struct drm_panel_funcs {
+	int (*loader_protect)(struct drm_panel *panel, bool on);
 	int (*disable)(struct drm_panel *panel);
 	int (*unprepare)(struct drm_panel *panel);
 	int (*prepare)(struct drm_panel *panel);
@@ -101,6 +103,14 @@ static inline int drm_panel_disable(struct drm_panel *panel)
 	return panel ? -ENOSYS : -EINVAL;
 }
 
+static inline int drm_panel_loader_protect(struct drm_panel *panel, bool on)
+{
+	if (panel && panel->funcs && panel->funcs->loader_protect)
+		return panel->funcs->loader_protect(panel, on);
+
+	return panel ? -ENOSYS : -EINVAL;
+}
+
 static inline int drm_panel_prepare(struct drm_panel *panel)
 {
 	if (panel && panel->funcs && panel->funcs->prepare)
-- 
2.34.1