On Fri, Jun 26, 2020 at 11:18:00AM -0400, Ralph Siemsen wrote:

Hi Serge, Pavel, Greg,

On Mon, Jun 22, 2020 at 11:51:21PM +0300, Serge Semin wrote:

quoted

Hello Pavel

On Fri, Jun 19, 2020 at 11:07:19PM +0200, Pavel Machek wrote:

quoted

Mainline patch simply changes return value, but code is different in
v4.19, and poll_transfer will now be avoided when dws->dma_mapped. Is
that a problem?

Actually no.) In that old 4.19 context it's even better to return straight away
no matter what value is returned by the dma_transfer() callback.

This patch changes the return dma_transfer return value from 0 to 1, 
however it was only done in spi-dw-mid.c func mid_spi_dma_transfer().

There is an identical function in spi-dw-mmio.c that needs the same 
treatment, otherwise access to the SPI device becomes erratic and even 
causes kernel to hang. Guess how I found this ;-)

So the following patch is needed as well, at least in 4.9 and 4.19, I 
did not check/test other versions. Mainline does not need this, since 
the code seems to have been refactored to avoid the duplication.

Could you add your signed-off-by tag please? :)

-- 
Thanks,
Sasha