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

[Lukasz Majewski <l.majewski@majess.pl>]

On Fri, 28 Aug 2015 17:21:51 -0600
Simon Glass <sjg@chromium.org> wrote:

> Hi Lukasz,
> 
> On 28 August 2015 at 07:50, Lukasz Majewski <l.majewski@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@samsung.com>
> > Cc: Tom Rini <trini@konsulko.com>
> > Cc: Simon Glass <sjg@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.

> 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. 

> 
> Regards,
> Simon

Best regards,

Lukasz Majewski
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