[RESEND v3 2/2] drm/bridge: anx7625: disable regulators when power off

[Hsin-Yi Wang]

When suspending the driver, anx7625_power_standby() will be called to
turn off reset-gpios and enable-gpios. However, power supplies are not
disabled. To save power, the driver can get the power supply regulators
and turn off them in anx7625_power_standby().

Signed-off-by: Hsin-Yi Wang <hsi...@chromium.org>
---
Change:
v3: add delays between regulators power on
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 34 +++++++++++++++++++++++
 drivers/gpu/drm/bridge/analogix/anx7625.h |  1 +
 2 files changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c 
b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 65cc05982f826..23283ba0c4f93 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>
@@ -875,12 +876,25 @@ static int sp_tx_edid_read(struct anx7625_data *ctx,
 static void anx7625_power_on(struct anx7625_data *ctx)
 {
        struct device *dev = &ctx->client->dev;
+       int ret, i;
 
        if (!ctx->pdata.low_power_mode) {
                DRM_DEV_DEBUG_DRIVER(dev, "not low power mode!\n");
                return;
        }
 
+       for (i = 0; i < ARRAY_SIZE(ctx->pdata.supplies); i++) {
+               ret = regulator_enable(ctx->pdata.supplies[i].consumer);
+               if (ret < 0) {
+                       DRM_DEV_DEBUG_DRIVER(dev, "cannot enable supply %d: 
%d\n",
+                                            i, ret);
+                       goto reg_err;
+               }
+               usleep_range(2000, 2100);
+       }
+
+       usleep_range(4000, 4100);
+
        /* Power on pin enable */
        gpiod_set_value(ctx->pdata.gpio_p_on, 1);
        usleep_range(10000, 11000);
@@ -889,11 +903,16 @@ static void anx7625_power_on(struct anx7625_data *ctx)
        usleep_range(10000, 11000);
 
        DRM_DEV_DEBUG_DRIVER(dev, "power on !\n");
+       return;
+reg_err:
+       for (--i; i >= 0; i--)
+               regulator_disable(ctx->pdata.supplies[i].consumer);
 }
 
 static void anx7625_power_standby(struct anx7625_data *ctx)
 {
        struct device *dev = &ctx->client->dev;
+       int ret;
 
        if (!ctx->pdata.low_power_mode) {
                DRM_DEV_DEBUG_DRIVER(dev, "not low power mode!\n");
@@ -904,6 +923,12 @@ static void anx7625_power_standby(struct anx7625_data *ctx)
        usleep_range(1000, 1100);
        gpiod_set_value(ctx->pdata.gpio_p_on, 0);
        usleep_range(1000, 1100);
+
+       ret = regulator_bulk_disable(ARRAY_SIZE(ctx->pdata.supplies),
+                                    ctx->pdata.supplies);
+       if (ret < 0)
+               DRM_DEV_DEBUG_DRIVER(dev, "cannot disable supplies %d\n", ret);
+
        DRM_DEV_DEBUG_DRIVER(dev, "power down\n");
 }
 
@@ -1742,6 +1767,15 @@ static int anx7625_i2c_probe(struct i2c_client *client,
        platform->client = client;
        i2c_set_clientdata(client, platform);
 
+       pdata->supplies[0].supply = "vdd10";
+       pdata->supplies[1].supply = "vdd18";
+       pdata->supplies[2].supply = "vdd33";
+       ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pdata->supplies),
+                                     pdata->supplies);
+       if (ret) {
+               DRM_DEV_ERROR(dev, "fail to get power supplies: %d\n", ret);
+               return ret;
+       }
        anx7625_init_gpio(platform);
 
        atomic_set(&platform->power_status, 0);
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h 
b/drivers/gpu/drm/bridge/analogix/anx7625.h
index 193ad86c54503..e4a086b3a3d7b 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -350,6 +350,7 @@ struct s_edid_data {
 struct anx7625_platform_data {
        struct gpio_desc *gpio_p_on;
        struct gpio_desc *gpio_reset;
+       struct regulator_bulk_data supplies[3];
        struct drm_bridge *panel_bridge;
        int intp_irq;
        u32 low_power_mode;
-- 
2.30.0.617.g56c4b15f3c-goog