Patch merged into coreboot/master: spi: Add a way to show SPI transfer speed for reads

the following patch was just integrated into master:
commit aa58a9eebfc1a60ccc614ef6a064cf0ffce1c114
Author: Simon Glass 
Date:   Sat Aug 27 15:03:02 2016 -0600

spi: Add a way to show SPI transfer speed for reads

SPI read speed directly impacts boot time and we do quite a lot of
    reading.

Add a way to easily find out the speed of SPI flash reads within
    coreboot.

Write speed is less important since there are very few writes and they
    are small.

BUG=chrome-os-partner:56556
    BRANCH=none
    TEST=run on gru with SPI_SPEED_DEBUG set to 1. See the output messages:
    read SPI 627d4 7d73: 18455 us, 1740 KB/s, 13.920 Mbps

Change-Id: Id3814bd2b7bd045cdfcc67eb1fabc861bf9ed3b2
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 82cb93f6be47efce3b0a3843bab89d2381baef89
    Original-Change-Id: Iec66f5b8e3ad62f14d836a538dc7801e4ca669e7
    Original-Signed-off-by: Simon Glass 
    Original-Reviewed-on: https://chromium-review.googlesource.com/376944
    Original-Commit-Ready: Julius Werner 
    Original-Tested-by: Simon Glass 
    Original-Reviewed-by: Julius Werner 
    Reviewed-on: https://review.coreboot.org/16701
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See https://review.coreboot.org/16701 for details.

-gerrit