| Message ID | 20220707080600.49041-3-allen.chen@ite.com.tw (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/bridge: it6505: Fixes bugs | expand |
On Thu, 7 Jul 2022 at 10:06, allen <allen.chen@ite.com.tw> wrote: > > From: allen chen <allen.chen@ite.com.tw> > > Use i2c bus to read/write when it6505 power off will occure i2c error. ^^^ typ-o Change occure to occur. This is an issue that would have been caught by running checkpatch --strict, please try to run it on all patches before submission. > 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> > > --- > 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 > With that fixed: Reviewed-by: Robert Foss <robert.foss@linaro.org>
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; }