[coreboot-gerrit] Patch merged into coreboot/master: f9ff353 spi: support controllers with limited transfer size capabilities

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit f9ff353430aae70e5cc04fb32d983b572956bd7d
Author: Vadim Bendebury <vbendeb at chromium.org>
Date:   Sat Nov 29 15:06:26 2014 -0800

    spi: support controllers with limited transfer size capabilities
    
    Some SPI controllers (like Imgtec Pistachio), have a hard limit on SPI
    read and write transactions. Limiting transfer size in the wrapper
    allows to provide the API user with unlimited transfer size
    transactions.
    
    The tranfer size limitation is added to the spi_slave structure, which
    is set up by the controller driver. The value of zero in this field
    means 'unlimited transfer size'. It will work with existion drivers,
    as they all either keep structures in the bss segment, or initialize
    them to all zeros.
    
    This patch addresses the problem for reads only, as coreboot is not
    expected to require to write long chunks into SPI devices.
    
    BRANCH=none
    BUG=chrome-os-partner:32441, chrome-os-partner:31438
    TEST=set transfer size limit to artificially low value (4K) and
         observed proper operation on both Pistachio and ipq8086: both
         Storm and Urara booted through romstage and ramstage.
    
    Change-Id: Ibb96aa499c3eec458c94bf1193fbbbf5f54e1477
    Signed-off-by: Stefan Reinauer <reinauer at chromium.org>
    Original-Commit-Id: 4f064fdca5b6c214e7a7f2751dc24e33cac2ea45
    Original-Change-Id: I9df24f302edc872bed991ea450c0af33a1c0ff7b
    Original-Signed-off-by: Vadim Bendebury <vbendeb at chromium.org>
    Original-Reviewed-on: https://chromium-review.googlesource.com/232239
    Original-Reviewed-by: Aaron Durbin <adurbin at chromium.org>
    Original-Reviewed-by: David Hendricks <dhendrix at chromium.org>
    Reviewed-on: http://review.coreboot.org/9571
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi <pgeorgi at google.com>


See http://review.coreboot.org/9571 for details.

-gerrit