[U-Boot] [PATCH v3 32/54] mmc: Calculate dwmmc FIFO threshold size if not provided

[Simon Glass]

Hi Jaehoon,

On 24 June 2015 at 19:58, Jaehoon Chung <jh80.chung at gmail.com> wrote:
>
> Hi, Simon.
>
> On 06/24/2015 06:38 AM, Simon Glass wrote:
> > We can calculate this. Add code to do this if it is not provided.
>
> Did you consider the kernel side?

Can you please be more specific?

Regards,
Simon

>
> Best Regards,
> Jaehoon Chung
>
> >
> > Signed-off-by: Simon Glass <sjg at chromium.org>
> > ---
> >
> > Changes in v3: None
> > Changes in v2: None
> >
> >  drivers/mmc/dw_mmc.c | 10 ++++++++--
> >  1 file changed, 8 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
> > index a034c3f..cce2a5d 100644
> > --- a/drivers/mmc/dw_mmc.c
> > +++ b/drivers/mmc/dw_mmc.c
> > @@ -355,9 +355,15 @@ static int dwmci_init(struct mmc *mmc)
> >       dwmci_writel(host, DWMCI_IDINTEN, 0);
> >       dwmci_writel(host, DWMCI_BMOD, 1);
> >
> > -     if (host->fifoth_val) {
> > -             dwmci_writel(host, DWMCI_FIFOTH, host->fifoth_val);
> > +     if (!host->fifoth_val) {
> > +             uint32_t fifo_size;
> > +
> > +             fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
> > +             fifo_size = ((fifo_size & RX_WMARK_MASK) >> RX_WMARK_SHIFT) + 1;
> > +             host->fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size / 2 - 1) |
> > +                             TX_WMARK(fifo_size / 2);
> >       }
> > +     dwmci_writel(host, DWMCI_FIFOTH, host->fifoth_val);
> >
> >       dwmci_writel(host, DWMCI_CLKENA, 0);
> >       dwmci_writel(host, DWMCI_CLKSRC, 0);
> >
>