[lkml]   [2007]   [Aug]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: sdio: set the functions' block size
Pierre Ossman wrote:
> On Tue, 31 Jul 2007 16:36:32 +0100
> David Vrabel <> wrote:
>> Prior to calling the driver's probe(), set the functions' block size
>> to the largest that's supported by both the card and the driver.
>> Signed-off-by: David Vrabel <>
> Why a maximum size for the driver?

For efficient use of the bus it is useful to pad transfers to a multiple
of the block size. I reckoned it was potentially beneficial for drivers
to use smaller blocks so less padding was required. However, after
looking at some figures the per block overhead (28 clocks for a write)
really does limit the transfer sizes where small block sizes is beneficial.

I'll remove this. Drivers can still override the block size by calling
sdio_set_block_size() directly.

David Vrabel, Software Engineer, Drivers group Tel: +44 (0)1223 692562
CSR plc, Churchill House, Cambridge Business Park, Cowley Road, CB4 0WZ

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-08-06 12:55    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean