Re: [PATCH] i2c: exynos5: fix arbitration lost handling

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Hi Andrzej,

On Thu, Jan 05, 2017 at 01:06:53PM +0100, Andrzej Hajda wrote:
> In case of arbitration lost adequate interrupt sometimes is not signaled. As
> a result transfer timeouts and is not retried, as it should. To avoid such
> cases code is added to check transaction status in case of every interrupt.
> 
> Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
> ---
> Hi,
> 
> I am not I2C specialist, this patch is a result of debugging issues
> with SiI8620 MHL driver on TM2 device. I guess the main problem is
> with SiI8620 chip, but exynos5 i2c is also guilty - with i2c-gpio driver
> it works correctly - there is only one arbitration lost at 1st transaction
> (which is properly handled - transfer is repeated succesfully). In case
> of exynos5 there are much more arbitration losts. Lowering bus speed
> decreases frequency of losts but do not eliminate them.
> Any help/hint, what could cause such issues?

I'm having the same issue on TM2 and your patch fixes it. I'm
not sure, though, that's the right fix.

In any case I will look into it.

Andi
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