Re: [PATCH 2/2] spi: qcom-geni: Add property to force GSI mode

[Dmitry Baryshkov]

On Mon, Jun 15, 2026 at 12:25:32PM +0800, Pengyu Luo wrote:
> On Mon, Jun 15, 2026 at 5:18 AM Dmitry Baryshkov
> <dmitry.baryshkov@xxxxxxxxxxxxxxxx> wrote:
> >
> > On Sun, Jun 14, 2026 at 04:34:24PM +0800, Pengyu Luo wrote:
> > > Some devices (such as gaokun3) do not disable FIFO mode, causing the
> > > driver to fallback to FIFO mode by default. However, these platforms
> > > also support GSI mode, which is highly preferred for certain
> > > peripherals like SPI touchscreens to improve performance.
> > >
> > > Introduce the "qcom,force-gsi-mode" device property to hint and force
> > > the controller into GSI mode during initialization.
> >
> > Ideally, this should be decided by the SPI controller based on the
> > requirements. Another option would be to prefer GSI for all transfers if
> > it is available, ignoring the FIFO even if it is not disabled.
> >
> 
> I have read reviews. Can we check if the compatible
> "qcom,sm6350-gpi-dma" is in DT? If the gpi dma controller is
> presented, then we enable GSI mode.

Can we just check for the dmas property? If it is present and if we
could get DMA channels, then GSI DMA is available.

> 
> Best wishes,
> Pengyu
> 
> > >
> > > Signed-off-by: Pengyu Luo <mitltlatltl@xxxxxxxxx>
> > > ---
> > >  drivers/spi/spi-geni-qcom.c | 7 +++++++
> > >  1 file changed, 7 insertions(+)
> > >
> >
> > --
> > With best wishes
> > Dmitry

-- 
With best wishes
Dmitry