| Message ID | 1474977426-3272-4-git-send-email-noralf@tronnes.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
> On 27 Sep 2016, at 13:57, Noralf Trønnes <noralf@tronnes.org> wrote: > > Writing to an AT24C32 generates on average 2x i2c transfer errors per > 32-byte page write. Which amounts to a lot for a 4k write. This is due > to the fact that the chip doesn't respond during it's internal write > cycle when the at24 driver tries and retries the next write. > Reduce this flooding of the log by using dev_err_ratelimited(). > > Signed-off-by: Noralf Trønnes <noralf@tronnes.org> > Reviewed-by: Eric Anholt <eric@anholt.net> > --- > drivers/i2c/busses/i2c-bcm2835.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c > index df036ed..370a322 100644 > --- a/drivers/i2c/busses/i2c-bcm2835.c > +++ b/drivers/i2c/busses/i2c-bcm2835.c > @@ -207,7 +207,8 @@ static int bcm2835_i2c_xfer_msg(struct bcm2835_i2c_dev *i2c_dev, > (msg->flags & I2C_M_IGNORE_NAK)) > return 0; > > - dev_err(i2c_dev->dev, "i2c transfer failed: %x\n", i2c_dev->msg_err); > + dev_err_ratelimited(i2c_dev->dev, "i2c transfer failed: %x\n", > + i2c_dev->msg_err); Do we really need this error message at all? Maybe just remove it instead, because error messages during "normal"/successfull operations of at24 seems strange. Or make it a debug message instead. Martin
Den 27.09.2016 15:01, skrev Martin Sperl: >> On 27 Sep 2016, at 13:57, Noralf Trønnes <noralf@tronnes.org> wrote: >> >> Writing to an AT24C32 generates on average 2x i2c transfer errors per >> 32-byte page write. Which amounts to a lot for a 4k write. This is due >> to the fact that the chip doesn't respond during it's internal write >> cycle when the at24 driver tries and retries the next write. >> Reduce this flooding of the log by using dev_err_ratelimited(). >> >> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> >> Reviewed-by: Eric Anholt <eric@anholt.net> >> --- >> drivers/i2c/busses/i2c-bcm2835.c | 3 ++- >> 1 file changed, 2 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c >> index df036ed..370a322 100644 >> --- a/drivers/i2c/busses/i2c-bcm2835.c >> +++ b/drivers/i2c/busses/i2c-bcm2835.c >> @@ -207,7 +207,8 @@ static int bcm2835_i2c_xfer_msg(struct bcm2835_i2c_dev *i2c_dev, >> (msg->flags & I2C_M_IGNORE_NAK)) >> return 0; >> >> - dev_err(i2c_dev->dev, "i2c transfer failed: %x\n", i2c_dev->msg_err); >> + dev_err_ratelimited(i2c_dev->dev, "i2c transfer failed: %x\n", >> + i2c_dev->msg_err); > Do we really need this error message at all? > > Maybe just remove it instead, because error messages during > "normal"/successfull operations of at24 seems strange. > > Or make it a debug message instead. I have looked through 64 i2c bus drivers, 8 use dev_err and 2 use dev_warn on transfer errors (not timeouts). Several use dev_dbg. I'll change it to dev_dbg instead. Thanks. Noralf.
diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c index df036ed..370a322 100644 --- a/drivers/i2c/busses/i2c-bcm2835.c +++ b/drivers/i2c/busses/i2c-bcm2835.c @@ -207,7 +207,8 @@ static int bcm2835_i2c_xfer_msg(struct bcm2835_i2c_dev *i2c_dev, (msg->flags & I2C_M_IGNORE_NAK)) return 0; - dev_err(i2c_dev->dev, "i2c transfer failed: %x\n", i2c_dev->msg_err); + dev_err_ratelimited(i2c_dev->dev, "i2c transfer failed: %x\n", + i2c_dev->msg_err); if (i2c_dev->msg_err & BCM2835_I2C_S_ERR) return -EREMOTEIO;