lkml.org 
[lkml]   [2008]   [Sep]   [7]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateSun, 7 Sep 2008 12:38:32 +0200
FromPierre Ossman <>
SubjectRe: [RFC][PATCH] MMC: Use write timeout value as read from CSR
On Mon, 1 Sep 2008 16:12:03 +0100
"Matt Fleming" <mattjfleming@googlemail.com> wrote:

> Currently, the MMC/SD over SPI code has a hard-coded timeout value of
> 250ms on writes. This is correct for SD cards and is specified in the
> spec, but it is not correct for MMC cards. For MMC cards the values
> that is read from the CSR should be used.
> 
> There is already code to ensure that the write timeout value for SD
> cards does not exceed 250ms, this patch only affects the MMC case.
> 

This actually isn't fully correct for SD either as it only specifies
that 250 ms is the upper bound on the timeout.

I believe the proper way of solving this is to have mmc_spi respect the
timeouts set in the request structure. Modify mmc_set_data_timeout() if
necessary.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org

  WARNING: This correspondence is being monitored by the
  Swedish government. Make sure your server uses encryption
  for SMTP traffic and consider using PGP for end-to-end
  encryption.


\
 
 \ /
  Last update: 2008-09-07 12:41    [from the cache]
©2003-2008