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

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>

1 files changed, 23 insertions, 6 deletions

diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c b/drivers/media/usb/em28xx/em28xx-i2c.c
index bd8101dfda7c..ba6433c3a643 100644
--- a/drivers/media/usb/em28xx/em28xx-i2c.c
+++ b/drivers/media/usb/em28xx/em28xx-i2c.c
@@ -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;
 }
 
 /*