On Thu, Feb 10, 2022 at 10:03:16AM +0800, Yun Zhou wrote:

> if the last xfer->cs_change is true, keep_cs will be true, and it will not
> call spi_set_cs() to set CS to false. Do you mean to keep CS enabled in this
> case?

Yes, that's exactly what is supposed to happen in that case.

> I do not think it will break cs_change support. In my understanding,
> cs_change indicates whether or not change CS after an xfer completed. But at
> present if the last xfer->cs_change is true, we will not change CS to
> disabled state. Is this the result we want? I'm confused.

Yes, it behaves differently on the last transfer.