[PATCH 1/8] tty: serial: fsl_lpuart: consider TX FIFO too in tx_empty

[Bhuvanchandra DV]

On 06/26/16 02:56, Greg KH wrote:

> On Thu, Jun 09, 2016 at 08:40:32PM +0530, Bhuvanchandra DV wrote:
>> From: Stefan Agner <stefan at agner.ch>
>>
>> Currently the tx_empty callback only considers the Transmit Complete
>> Flag (TC). The reference manual is not quite clear if the TC flag
>> covers the TX FIFO too. Debug prints on real hardware have shown that
>> from time to time the TC flag is asserted (indicating Transmitter
>> idle) while there are still data in the TX FIFO. Hence, in this case
>> the serial core will call the shutdown callback even though there are
>> data remaining in the TX FIFO buffers.
>>
>> Avoid early shutdowns by considering the TX FIFO empty flag too. Also
>> avoid theoretical race conditions between DMA and the driver by
>> checking whether the TX DMA is in progress too.
>>
>> Signed-off-by: Stefan Agner <stefan at agner.ch>
>> ---
>>   drivers/tty/serial/fsl_lpuart.c | 14 ++++++++++++--
>>   1 file changed, 12 insertions(+), 2 deletions(-)
> Why are you not signing off on patches that are flowing through you?
> Please fix this up and resend the series, after breaking up the clock
> change as asked.

Okay

>
> thanks,
>
> greg k-h