From: allen chen <allen.chen@xxxxxxxxxx>
Use i2c bus to read/write when it6505 power off will occur i2c error.
Add this check will prevent i2c error when it6505 power off.
Signed-off-by: Pin-Yen Lin <treapking@xxxxxxxxxxxx>
Signed-off-by: Allen Chen <allen.chen@xxxxxxxxxx>
Reviewed-by: Robert Foss <robert.foss@xxxxxxxxxx>
---
drivers/gpu/drm/bridge/ite-it6505.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index aa5e0aa1af85..cfd2c3275dc5 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -518,6 +518,9 @@ static int it6505_read(struct it6505 *it6505, unsigned int reg_addr)
int err;
struct device *dev = &it6505->client->dev;
+ if (!it6505->powered)
+ return -ENODEV;
+
err = regmap_read(it6505->regmap, reg_addr, &value);
if (err < 0) {
dev_err(dev, "read failed reg[0x%x] err: %d", reg_addr, err);
@@ -533,6 +536,9 @@ static int it6505_write(struct it6505 *it6505, unsigned int reg_addr,
int err;
struct device *dev = &it6505->client->dev;
+ if (!it6505->powered)
+ return -ENODEV;
+
err = regmap_write(it6505->regmap, reg_addr, reg_val);
if (err < 0) {
@@ -550,6 +556,9 @@ static int it6505_set_bits(struct it6505 *it6505, unsigned int reg,
int err;
struct device *dev = &it6505->client->dev;
+ if (!it6505->powered)
+ return -ENODEV;
+
err = regmap_update_bits(it6505->regmap, reg, mask, value);
if (err < 0) {
dev_err(dev, "write reg[0x%x] = 0x%x mask = 0x%x failed err %d",
@@ -2553,13 +2562,12 @@ static int it6505_poweron(struct it6505 *it6505)
usleep_range(10000, 20000);
}
+ it6505->powered = true;
it6505_reset_logic(it6505);
it6505_int_mask_enable(it6505);
it6505_init(it6505);
it6505_lane_off(it6505);
- it6505->powered = true;
-
return 0;
}
--
2.25.1
