rk312x:lvds: add pull down lcdc io when the first time of system suspend

diff --git a/arch/arm/boot/dts/rk3126-86v.dts b/arch/arm/boot/dts/rk3126-86v.dts
index 7ce872e8e825dfdce6091b08b88c4de652753420..061735349a7511ff6890f1874b9c2000758ee62c 100644 (file)
--- a/arch/arm/boot/dts/rk3126-86v.dts
+++ b/arch/arm/boot/dts/rk3126-86v.dts
@@ -185,6 +185,14 @@
        pinctrl-names = "lcdc", "sleep";
        pinctrl-0 = <&lcdc0_lcdc_d>;
        pinctrl-1 = <&lcdc0_lcdc_gpio>;
+       lcdc-gpios = <&gpio2 GPIO_B4 GPIO_ACTIVE_LOW
+                       &gpio2 GPIO_B5 GPIO_ACTIVE_LOW
+                       &gpio2 GPIO_B6 GPIO_ACTIVE_LOW
+                       &gpio2 GPIO_B7 GPIO_ACTIVE_LOW
+                       &gpio2 GPIO_C0 GPIO_ACTIVE_LOW
+                       &gpio2 GPIO_C1 GPIO_ACTIVE_LOW
+                       &gpio2 GPIO_C2 GPIO_ACTIVE_LOW
+                       &gpio2 GPIO_C3 GPIO_ACTIVE_LOW>;
 };
 
 &lcdc {

diff --git a/arch/arm/boot/dts/rk3126-sdk.dts b/arch/arm/boot/dts/rk3126-sdk.dts
index 3049052774d0fa838fa13d924ad734a654858bdd..1574f44f664dccef36dd7babf7a9f07529998b47 100755 (executable)
--- a/arch/arm/boot/dts/rk3126-sdk.dts
+++ b/arch/arm/boot/dts/rk3126-sdk.dts
@@ -52,6 +52,14 @@
        pinctrl-names = "lcdc", "sleep";
        pinctrl-0 = <&lcdc0_lcdc_d>;
        pinctrl-1 = <&lcdc0_lcdc_gpio>;
+       lcdc-gpios = <&gpio2 GPIO_B4 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_B5 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_B6 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_B7 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_C0 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_C1 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_C2 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_C3 GPIO_ACTIVE_LOW>;
 };
 
 &lcdc {

diff --git a/arch/arm/boot/dts/rk3128-sdk.dts b/arch/arm/boot/dts/rk3128-sdk.dts
index 99a0d15254456053f567041ca6488d4336984194..669f6e30d91b5d776d8346412ad3a1ce01bc7949 100755 (executable)
--- a/arch/arm/boot/dts/rk3128-sdk.dts
+++ b/arch/arm/boot/dts/rk3128-sdk.dts
@@ -36,6 +36,14 @@
        pinctrl-names = "lcdc", "sleep";
        pinctrl-0 = <&lcdc0_lcdc_d>;
        pinctrl-1 = <&lcdc0_lcdc_gpio>;
+       lcdc-gpios = <&gpio2 GPIO_B4 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_B5 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_B6 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_B7 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_C0 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_C1 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_C2 GPIO_ACTIVE_LOW
+                        &gpio2 GPIO_C3 GPIO_ACTIVE_LOW>;
 };
 
 &lcdc {

diff --git a/drivers/video/rockchip/transmitter/rk31xx_lvds.c b/drivers/video/rockchip/transmitter/rk31xx_lvds.c
index 50cfdab62f2afc69f4401ee2928ddac3741af6ab..dea0fa634dead4be41826c8d88fef0f8dbf6ff0c 100755 (executable)
--- a/drivers/video/rockchip/transmitter/rk31xx_lvds.c
+++ b/drivers/video/rockchip/transmitter/rk31xx_lvds.c
@@ -27,6 +27,12 @@
 #include <linux/rockchip/grf.h>
 #include "rk31xx_lvds.h"
 
+#ifdef CONFIG_OF
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#endif
+
 
 #define grf_readl(offset)      readl_relaxed(RK_GRF_VIRT + offset)
 #define grf_writel(v,offset)                                    \
@@ -106,6 +112,44 @@ static int rk31xx_lvds_pwr_off(void)
         return 0;
 }
 
+static int rk31xx_lvds_pull_down_io(void)
+{
+       int gpio;
+       int i = 0, gpio_nums = 0, val = 0;
+       enum of_gpio_flags flags;
+       char gpio_name[20] = {0};
+       struct rk_lvds_device *lvds = rk31xx_lvds;
+       static bool pull_down = false;
+
+        if (unlikely(!lvds) || !lvds->sys_state)
+                return 0;
+
+       if (pull_down)
+               return 0;
+
+       gpio_nums = of_gpio_named_count(lvds->dev->of_node, "lcdc-gpios");
+       if (gpio_nums > 0) {
+               for (i = 0; i < gpio_nums; i++) {
+                       gpio = of_get_named_gpio_flags(lvds->dev->of_node,
+                                                      "lcdc-gpios", i, &flags);
+                       if (!gpio_is_valid(gpio))
+                               continue;
+                       val = !(flags & OF_GPIO_ACTIVE_LOW);
+                       sprintf(gpio_name, "lcdc-gpio%d", i);
+                       if (!gpio_request(gpio, gpio_name)) {
+                               gpio_direction_output(gpio, val);
+                               msleep(1);
+                       } else {
+                               dev_err(lvds->dev, "request %s gpio fail!\n",
+                                       gpio_name);
+                       }
+               }
+       }
+       pull_down = true;
+
+       return 0;
+}
+
 static int rk31xx_lvds_disable(void)
 {
        struct rk_lvds_device *lvds = rk31xx_lvds;
@@ -127,6 +171,7 @@ static int rk31xx_lvds_disable(void)
                         pinctrl_select_state(lvds->pins->p,
                                              lvds->pins->sleep_state);
                 }
+               rk31xx_lvds_pull_down_io();
         }
 #endif
         lvds->sys_state = false;