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[media] em28xx-i2c: fix the error code for unknown errors

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Commit e63b009d6e "em28xx-i2c: Fix error code for I2C error transfers"
changed the code to return -ETIMEDOUT on all unknown errors.
But the proper error code for unknown errors is -EIO.
So only report -ETIMEDOUT in case of the errors 0x02 and 0x04, which
are according to Mauro Carvalho Chehab's tests related to i2c clock
stretching and return -EIO for the rest.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Frank Schaefer 2014-01-19 18:48:35 -03:00 committed by Mauro Carvalho Chehab
parent 8ae8cd6c3e
commit 123a17d142
1 changed files with 23 additions and 6 deletions
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29
drivers/media/usb/em28xx/em28xx-i2c.c
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@ -226,10 +226,18 @@ static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
* (even with high payload) ...
*/
}
if (i2c_debug)
em28xx_warn("write to i2c device at 0x%x timed out (status=%i)\n",
addr, ret);
return -ETIMEDOUT;
if (ret == 0x02 || ret == 0x04) {
/* NOTE: these errors seem to be related to clock stretching */
if (i2c_debug)
em28xx_warn("write to i2c device at 0x%x timed out (status=%i)\n",
addr, ret);
return -ETIMEDOUT;
}
em28xx_warn("write to i2c device at 0x%x failed with unknown error (status=%i)\n",
addr, ret);
return -EIO;
}
/*
@ -279,8 +287,17 @@ static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
return -ENXIO;
}
em28xx_warn("unknown i2c error (status=%i)\n", ret);
return -ETIMEDOUT;
if (ret == 0x02 || ret == 0x04) {
/* NOTE: these errors seem to be related to clock stretching */
if (i2c_debug)
em28xx_warn("write to i2c device at 0x%x timed out (status=%i)\n",
addr, ret);
return -ETIMEDOUT;
}
em28xx_warn("write to i2c device at 0x%x failed with unknown error (status=%i)\n",
addr, ret);
return -EIO;
}
/*