[U-Boot] [PATCH 2/2] mmc: dw_mmc: Make timeout error visible to u-boot console

[Lukasz Majewski]

Hi Simon,

> Hi Lukasz,
> 
> On 29 August 2015 at 06:09, Lukasz Majewski <l.majewski at majess.pl>
> wrote:
> > On Fri, 28 Aug 2015 17:21:51 -0600
> > Simon Glass <sjg at chromium.org> wrote:
> >
> >> Hi Lukasz,
> >>
> >> On 28 August 2015 at 07:50, Lukasz Majewski
> >> <l.majewski at samsung.com> wrote:
> >> >
> >> > The timeout error for DW MMC transfer should be visible on the
> >> > u-boot console to speed up the process of debugging.
> >> >
> >> > Signed-off-by: Lukasz Majewski <l.majewski at samsung.com>
> >> > Cc: Tom Rini <trini at konsulko.com>
> >> > Cc: Simon Glass <sjg at chromium.org>
> >> > ---
> >> >  drivers/mmc/dw_mmc.c | 2 +-
> >> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> Can this be reported at the command line level instead?
> >
> > With my setup - dfu tests - I didn't receive any error/information
> > about the MMC (SD Card to be precise) timeout.
> >
> > (I would expect MMC subsystem to return -ETIMEOUT and then this
> > error would be propagated to dfu and stop execution of the dfu
> > command).
> >
> > This didn't work and hence should be scrutinized.
> 
> Agreed.
> 
> >
> >> It feels wrong
> >> to be printing errors in a driver.
> >
> > If this information would be printed on the console I might have
> > noticed it immediately and save some time for debugging.
> >
> >> Also, why does it return TIMEOUT
> >> instead of -ETIMEOUT?
> >
> > Good question.
> 
> It looks likes mmc.h has its own errors (NO_CARD_ERR, etc.). I suspect
> these could be converted to use standard errors.
> 
> Anyway your question remains. A driver error should be reported by
> the caller.

Please drop this patch. 

I've posted other one (as a reply tp this one):
"[PATCH] FIX: fat: Provide correct return code from disk_{read|write}"

to fix this problem.

> 
> Regards,
> Simon
> 



-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group