On Fri, Sep 21, 2012 at 10:28:00PM +0530, S, Venkatraman wrote:
> On Fri, Sep 21, 2012 at 8:51 PM, Balaji T K <balajitk@xxxxxx> wrote:
> > clock divisor can take a max value of 1023
> > update code as per TRM so that card init can be handled with
> > higher IP clock frequencies from which clock to the card is
> > derived.
> >
> This is difficult to read without some punctuation / capitalization.
>
> > Signed-off-by: Balaji T K <balajitk@xxxxxx>
> > ---
> > drivers/mmc/host/omap_hsmmc.c | 5 +++--
> > 1 files changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> > index d9af5f1..073b9ff 100644
> > --- a/drivers/mmc/host/omap_hsmmc.c
> > +++ b/drivers/mmc/host/omap_hsmmc.c
> > @@ -75,6 +75,7 @@
> > #define ICE 0x1
> > #define ICS 0x2
> > #define CEN (1 << 2)
> > +#define CLKD_MAX 0x3FF
>
> It'd be nice to have a comment on what 3FF stands for and it's
> relation to clock in MHz.
>
> > #define CLKD_MASK 0x0000FFC0
> > #define CLKD_SHIFT 6
> > #define DTO_MASK 0x000F0000
> > @@ -478,8 +479,8 @@ static u16 calc_divisor(struct omap_hsmmc_host *host, struct mmc_ios *ios)
> >
> > if (ios->clock) {
> > dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock);
> > - if (dsor > 250)
> > - dsor = 250;
> > + if (dsor > CLKD_MAX)
> > + dsor = CLKD_MAX;
>
> Can these two lines be written in one line as
> "dsor &= CLKD_MAX; " ?
maybe:
dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock);
dsor = clamp_t(u16, dsor, 0, CLKD_MAX);
--
balbi
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