| Message ID | 20201120161529.236447-2-jacopo+renesas@jmondi.org |
|---|---|
| State | Accepted |
| Commit | 909a0a189c677307edd461e21fd962784370d27f |
| Headers | show |
| Series | media: max9271: Fix GPIO handling | expand |
Hi Jacopo, On 20/11/2020 16:15, Jacopo Mondi wrote: > Fix GPIO enable/disable operations which wrongly read the 0x0f register > to obtain the current mask of the enabled lines instead of using > the correct 0x0e register. > > Also fix access to bit 0 of the register which is marked as reserved. > > Fixes: 34009bffc1c6 ("media: i2c: Add RDACM20 driver") > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> Took me a few reads of this and the datasheet to be sure :S But now I am :-D Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > --- > drivers/media/i2c/max9271.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/media/i2c/max9271.c b/drivers/media/i2c/max9271.c > index 0f6f7a092a46..c247db569bab 100644 > --- a/drivers/media/i2c/max9271.c > +++ b/drivers/media/i2c/max9271.c > @@ -223,12 +223,12 @@ int max9271_enable_gpios(struct max9271_device *dev, u8 gpio_mask) > { > int ret; > > - ret = max9271_read(dev, 0x0f); > + ret = max9271_read(dev, 0x0e); > if (ret < 0) > return 0; > > /* BIT(0) reserved: GPO is always enabled. */ > - ret |= gpio_mask | BIT(0); > + ret |= (gpio_mask & ~BIT(0)); > ret = max9271_write(dev, 0x0e, ret); > if (ret < 0) { > dev_err(&dev->client->dev, "Failed to enable gpio (%d)\n", ret); > @@ -245,12 +245,12 @@ int max9271_disable_gpios(struct max9271_device *dev, u8 gpio_mask) > { > int ret; > > - ret = max9271_read(dev, 0x0f); > + ret = max9271_read(dev, 0x0e); > if (ret < 0) > return 0; > > /* BIT(0) reserved: GPO cannot be disabled */ > - ret &= (~gpio_mask | BIT(0)); > + ret &= ~(gpio_mask | BIT(0)); > ret = max9271_write(dev, 0x0e, ret); > if (ret < 0) { > dev_err(&dev->client->dev, "Failed to disable gpio (%d)\n", ret); >
On 11/20/20 7:15 PM, Jacopo Mondi wrote: > Fix GPIO enable/disable operations which wrongly read the 0x0f register > to obtain the current mask of the enabled lines instead of using > the correct 0x0e register. > > Also fix access to bit 0 of the register which is marked as reserved. > > Fixes: 34009bffc1c6 ("media: i2c: Add RDACM20 driver") > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> > --- > drivers/media/i2c/max9271.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/media/i2c/max9271.c b/drivers/media/i2c/max9271.c > index 0f6f7a092a46..c247db569bab 100644 > --- a/drivers/media/i2c/max9271.c > +++ b/drivers/media/i2c/max9271.c > @@ -223,12 +223,12 @@ int max9271_enable_gpios(struct max9271_device *dev, u8 gpio_mask) > { > int ret; > > - ret = max9271_read(dev, 0x0f); > + ret = max9271_read(dev, 0x0e); > if (ret < 0) > return 0; > > /* BIT(0) reserved: GPO is always enabled. */ > - ret |= gpio_mask | BIT(0); > + ret |= (gpio_mask & ~BIT(0)); () hardly needed here, = and <op>= have very low prio... [...] MBR, Sergei
diff --git a/drivers/media/i2c/max9271.c b/drivers/media/i2c/max9271.c index 0f6f7a092a46..c247db569bab 100644 --- a/drivers/media/i2c/max9271.c +++ b/drivers/media/i2c/max9271.c @@ -223,12 +223,12 @@ int max9271_enable_gpios(struct max9271_device *dev, u8 gpio_mask) { int ret; - ret = max9271_read(dev, 0x0f); + ret = max9271_read(dev, 0x0e); if (ret < 0) return 0; /* BIT(0) reserved: GPO is always enabled. */ - ret |= gpio_mask | BIT(0); + ret |= (gpio_mask & ~BIT(0)); ret = max9271_write(dev, 0x0e, ret); if (ret < 0) { dev_err(&dev->client->dev, "Failed to enable gpio (%d)\n", ret); @@ -245,12 +245,12 @@ int max9271_disable_gpios(struct max9271_device *dev, u8 gpio_mask) { int ret; - ret = max9271_read(dev, 0x0f); + ret = max9271_read(dev, 0x0e); if (ret < 0) return 0; /* BIT(0) reserved: GPO cannot be disabled */ - ret &= (~gpio_mask | BIT(0)); + ret &= ~(gpio_mask | BIT(0)); ret = max9271_write(dev, 0x0e, ret); if (ret < 0) { dev_err(&dev->client->dev, "Failed to disable gpio (%d)\n", ret);
Fix GPIO enable/disable operations which wrongly read the 0x0f register to obtain the current mask of the enabled lines instead of using the correct 0x0e register. Also fix access to bit 0 of the register which is marked as reserved. Fixes: 34009bffc1c6 ("media: i2c: Add RDACM20 driver") Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> --- drivers/media/i2c/max9271.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)