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[media] em28xx-i2c: Add a read after I2C write

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All I2C logs we got for em28xx does that. With Terratec H5, at
400MHz speed, it seems that this is required, to avoid having
troubles at the I2C bus.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2011-07-09 19:36:11 -03:00
parent e4f4f8758b
commit bbc70e647b
1 changed files with 10 additions and 1 deletions
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11
drivers/media/video/em28xx/em28xx-i2c.c
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@ -181,16 +181,25 @@ static int em2800_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
/*
* em28xx_i2c_send_bytes()
* untested for more than 4 bytes
*/
static int em28xx_i2c_send_bytes(void *data, unsigned char addr, char *buf,
short len, int stop)
{
int wrcount = 0;
struct em28xx *dev = (struct em28xx *)data;
int write_timeout, ret;
wrcount = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
/* Seems to be required after a write */
for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
write_timeout -= 5) {
ret = dev->em28xx_read_reg(dev, 0x05);
if (!ret)
break;
msleep(5);
}
return wrcount;
}