Re: [PATCH 04/11] spi: dw: use TMOD_RO to read in enhanced spi modes

[Sudip Mukherjee <sudip.mukherjee@xxxxxxxxxx>]

Hi Mark,

On Tue, Aug 2, 2022 at 8:13 PM Mark Brown <broonie@xxxxxxxxxx> wrote:
>
> On Tue, Aug 02, 2022 at 06:57:48PM +0100, Sudip Mukherjee wrote:
> > When we are using the enhanced spi modes we can not use EEPROM Read.
> > The Synopsys datasheet mentions EEPROM Read is not applicable in
> > enhanced SPI modes. We will need to use Receive only mode.
> >
> > Signed-off-by: Sudip Mukherjee <sudip.mukherjee@xxxxxxxxxx>
> > ---
> >  drivers/spi/spi-dw-core.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
> > index 8c84a2e991b5..8e624620864f 100644
> > --- a/drivers/spi/spi-dw-core.c
> > +++ b/drivers/spi/spi-dw-core.c
> > @@ -727,7 +727,10 @@ static int dw_spi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
> >       cfg.dfs = 8;
> >       cfg.freq = clamp(mem->spi->max_speed_hz, 0U, dws->max_mem_freq);
> >       if (op->data.dir == SPI_MEM_DATA_IN) {
> > -             cfg.tmode = DW_SPI_CTRLR0_TMOD_EPROMREAD;
> > +             if (enhanced_spi)
> > +                     cfg.tmode = DW_SPI_CTRLR0_TMOD_RO;
> > +             else
> > +                     cfg.tmode = DW_SPI_CTRLR0_TMOD_EPROMREAD;
>
> This is fixing the previous commit...

This was not actually meant to be a fixup patch. I intentionally made
it separate so that "enhanced_spi" is introduced in the previous
patch,
and then modified the tmode read protocol in this patch based on
enhanced_spi. But I can merge it with the previous patch like you have
suggested.

--
Regards
Sudip