[U-Boot] [PATCH v2 2/2] xilinx_xiic: Fix transfer initialisation
tomas.melin at vaisala.com
Wed Jun 26 10:12:32 UTC 2019
On 6/26/19 12:46 PM, Marek Vasut wrote:
> On 6/26/19 7:30 AM, Melin Tomas wrote:
>> On 6/25/19 6:15 PM, Marek Vasut wrote:
>>> On 6/25/19 3:30 PM, Melin Tomas wrote:
>>>> Prior to starting a new transfer, conditionally wait for bus to not
>>>> be busy.
>>>> Reinitialise controller as otherwise operation is not stable.
>>>> For reference, see linux kernel commit: 9656eeebf3f1 ("i2c: Revert
>>>> "i2c: xiic: Do not reset controller before every transfer"")
>>>> Signed-off-by: Tomas Melin <tomas.melin at vaisala.com>
>>>> Changes in v2:
>>>> - Change variable declaration order
>>>> - Change timeout to 3ms
>>> Why 3mS ?
>> That is value used also in kernel driver.
> But why 3mS , why not e.g. 5mS ?
Quoting from comment: "for instance if previous transfer was terminated
due to TX error it might be that the bus is on it's way to become
available give it at most 3 ms to wake"
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