[PATCH] spi: imx: enable runtime pm support

[nikita.shubin at maquefel.me]

Hi Fabio,

Apllied on the top of

   Revert "spi: imx: Fix freeing of DMA channels if spi_bitbang_start() fails"

   This reverts commit 9e68d974b2fd4977e896e166656c36e2f80293d6.

Still experiencing the same issue:

[    4.322131] inv-mpu6000-spi spi2.0: I/O Error in PIO
[    4.329353] inv-mpu6000-spi spi2.0: SPI transfer failed: -110
[    4.391504] spi_master spi2: failed to transfer one message from queue

I have config CONFIG_PM=y.

13.11.2020, 14:26, "Fabio Estevam" <festevam at gmail.com>:
> Hi Nikita,
>
> On Fri, Nov 13, 2020 at 6:18 AM Nikita Shubin <nikita.shubin at maquefel.me> wrote:
>>  Hello Clark,
>>
>>  This patch breaks spi-imx on imx7d.
>>  Toradex Colibri imx7d spi reports with:
>>
>>      [ 4.258468] inv-mpu6000-spi spi2.0: I/O Error in PIO
>>      [ 4.264269] inv-mpu6000-spi spi2.0: SPI transfer failed: -110
>>      [ 4.264305] spi_master spi2: failed to transfer one message from queue
>>
>>  We are using spi-imx with dma.
>>
>>  Reverting your patch fixes this issue.
>>
>>  The baseline commit 951cbbc386ff01b50da4f46387e994e81d9ab431 (tag: v5.9.8, stable/linux-5.9.y)
>>
>>  Could you please give some comments on this issue ?
>
> Could you please try this patch from Sascha?
> https://lkml.org/lkml/2020/10/12/981