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path: root/drivers/gpu/drm/bridge/lontium-lt8912b.c
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Diffstat (limited to 'drivers/gpu/drm/bridge/lontium-lt8912b.c')
-rw-r--r--drivers/gpu/drm/bridge/lontium-lt8912b.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index e5839c89a3..97d4af3d13 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -43,6 +43,8 @@ struct lt8912 {
struct videomode mode;
+ struct regulator_bulk_data supplies[7];
+
u8 data_lanes;
bool is_power_on;
};
@@ -257,6 +259,12 @@ static int lt8912_free_i2c(struct lt8912 *lt)
static int lt8912_hard_power_on(struct lt8912 *lt)
{
+ int ret;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(lt->supplies), lt->supplies);
+ if (ret)
+ return ret;
+
gpiod_set_value_cansleep(lt->gp_reset, 0);
msleep(20);
@@ -267,6 +275,9 @@ static void lt8912_hard_power_off(struct lt8912 *lt)
{
gpiod_set_value_cansleep(lt->gp_reset, 1);
msleep(20);
+
+ regulator_bulk_disable(ARRAY_SIZE(lt->supplies), lt->supplies);
+
lt->is_power_on = false;
}
@@ -632,6 +643,48 @@ static const struct drm_bridge_funcs lt8912_bridge_funcs = {
.get_edid = lt8912_bridge_get_edid,
};
+static int lt8912_bridge_resume(struct device *dev)
+{
+ struct lt8912 *lt = dev_get_drvdata(dev);
+ int ret;
+
+ ret = lt8912_hard_power_on(lt);
+ if (ret)
+ return ret;
+
+ ret = lt8912_soft_power_on(lt);
+ if (ret)
+ return ret;
+
+ return lt8912_video_on(lt);
+}
+
+static int lt8912_bridge_suspend(struct device *dev)
+{
+ struct lt8912 *lt = dev_get_drvdata(dev);
+
+ lt8912_hard_power_off(lt);
+
+ return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(lt8912_bridge_pm_ops, lt8912_bridge_suspend, lt8912_bridge_resume);
+
+static int lt8912_get_regulators(struct lt8912 *lt)
+{
+ unsigned int i;
+ const char * const supply_names[] = {
+ "vdd", "vccmipirx", "vccsysclk", "vcclvdstx",
+ "vcchdmitx", "vcclvdspll", "vcchdmipll"
+ };
+
+ for (i = 0; i < ARRAY_SIZE(lt->supplies); i++)
+ lt->supplies[i].supply = supply_names[i];
+
+ return devm_regulator_bulk_get(lt->dev, ARRAY_SIZE(lt->supplies),
+ lt->supplies);
+}
+
static int lt8912_parse_dt(struct lt8912 *lt)
{
struct gpio_desc *gp_reset;
@@ -683,6 +736,10 @@ static int lt8912_parse_dt(struct lt8912 *lt)
goto err_free_host_node;
}
+ ret = lt8912_get_regulators(lt);
+ if (ret)
+ goto err_free_host_node;
+
of_node_put(port_node);
return 0;
@@ -768,6 +825,7 @@ static struct i2c_driver lt8912_i2c_driver = {
.driver = {
.name = "lt8912",
.of_match_table = lt8912_dt_match,
+ .pm = pm_sleep_ptr(&lt8912_bridge_pm_ops),
},
.probe = lt8912_probe,
.remove = lt8912_remove,