diff options
| author | allen chen <allen.chen@ite.com.tw> | 2022-07-15 10:49:06 +0800 |
|---|---|---|
| committer | Robert Foss <robert.foss@linaro.org> | 2022-07-18 13:43:18 +0200 |
| commit | 86088f88a25c76baac304b6f887e5da2c30c4e07 (patch) | |
| tree | 398b0be1f540b220373fb71650e68568e50cd802 /drivers | |
| parent | 899e90cf20a9d0eaec8cbc8e1ca1d05278afb6d7 (diff) | |
| download | linux-86088f88a25c76baac304b6f887e5da2c30c4e07.tar.bz2 | |
drm/bridge: it6505: Add i2c api power on check
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@chromium.org>
Signed-off-by: Allen Chen <allen.chen@ite.com.tw>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220715024910.12578-3-allen.chen@ite.com.tw
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/bridge/ite-it6505.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c index 8f5bb09ae252..a30a31b21542 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -506,6 +506,9 @@ 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); @@ -521,6 +524,9 @@ 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) { @@ -538,6 +544,9 @@ 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", @@ -2559,13 +2568,12 @@ 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; } |