On 07/02/2014 16:09, Jason Cooper wrote:
> On Fri, Feb 07, 2014 at 11:55:54AM +0100, Gregory CLEMENT wrote:
>> Offload can be used only on regular transactions and for 1 to byte
>> transfers. In the other cases we switch back to usual work flow.
>>
>> In this case we need to call mv64xxx_i2c_prepare_for_io() as this
>> function is not used when we try to use offloading.
>>
>> This commit adds this missing call when offloading have failed in the
>> MV64XXX_I2C_ACTION_OFFLOAD_SEND_START case.
>>
>> This fix the timeout seen when the the i2c driver try to access an
>> address where the device is absent on the Armada XP bases board.
>>
>> Cc: stable@xxxxxxxxxxxxxxx # v3.12+
>> Fixes: 930ab3d403ae (i2c: mv64xxx: Add I2C Transaction Generator support)
>>
>> Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
>> ---
>> drivers/i2c/busses/i2c-mv64xxx.c | 9 ++++++++-
>> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> I'd like to get a few tested-by's on this before this is pushed. We've
> had quite a bit of fixes this round :( Please test both multi_v7 and
> mvebu defconfigs.
Well of course I have tested with multi_v7 and mvebu defconfigs, but I
think it is not my tested-by that you want! :)
An for the test we only have to test the Armada XP B0 based board, because
in the other case the offload is disable, so the code I modified never
doesn't run.
Thanks,
Gregory
>
> Kevin, I know you're busy with a lot more than us, but if you could
> confirm that this fixes the bus hangs you reported, that would be great.
>
> thx,
>
> Jason.
>
>>
>> diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
>> index b8c5187b9ee0..a1700c62d955 100644
>> --- a/drivers/i2c/busses/i2c-mv64xxx.c
>> +++ b/drivers/i2c/busses/i2c-mv64xxx.c
>> @@ -461,8 +461,15 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
>> case MV64XXX_I2C_ACTION_OFFLOAD_SEND_START:
>> if (!mv64xxx_i2c_offload_msg(drv_data))
>> break;
>> - else
>> + else {
>> drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
>> + /*
>> + * Switch to the standard path, so we finally need to
>> + * prepare the io that have not been done in
>> + * mv64xxx_i2c_execute_msg
>> + */
>> + mv64xxx_i2c_prepare_for_io(drv_data, drv_data->msgs);
>> + }
>> /* FALLTHRU */
>> case MV64XXX_I2C_ACTION_SEND_START:
>> writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START,
>> --
>> 1.8.1.2
>>
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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