[coreboot-gerrit] Patch merged into coreboot/master: 419fa61 libpayload: ipq808x: stale interrupt shall not be cleared unconditionally

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit 419fa61f370072d82c037f84d8f89d0c4c23480b
Author: Yogesh Lal <ylal at codeaurora.org>
Date:   Fri Jun 27 12:07:51 2014 +0530

    libpayload: ipq808x: stale interrupt shall not be cleared unconditionally
    
    The serial driver hangs in cases when FIFO has more than single word to be
    processed. Easiest way to reproduce is to paste a string of greater than 4
    characters in cli.
    
    Clearing the RXSTALE interrupt without draining all the characters from FIFO
    leads to the issue as the driver is dependent on msm_boot_uart_dm_read
    function to reinitialize for next transfer.
    
    Logically the driver is organized in such a manner that next transfer never
    gets initiated till rx_data_read < total_rx_data. Clearing the RXSTALE without
    consideration of total number of characters (or words) unprocessed makes the
    msm_boot_uart_dm_read to return on the first if conditional. Thus the driver is
    stuck forever.
    
    A quick fix is to avoid clearing the stale interrupt. Reset is handled whenever
    a new transfer is initialized in msm_boot_uart_dm_init_rx_transfer.
    
    BUG=chrome-os-partner:29542
    TEST=manual
    	-Paste a string greater than 4 characters in cli.
    
    Original-Change-Id: I016afb01a77cd14764f0176f6bf144fb29796c2f
    Original-Signed-off-by: Yogesh Lal <ylal at codeaurora.org>
    Original-Reviewed-on: https://chromium-review.googlesource.com/209512
    Original-Reviewed-by: Vadim Bendebury <vbendeb at chromium.org>
    Original-Commit-Queue: Vadim Bendebury <vbendeb at chromium.org>
    Original-Tested-by: Vadim Bendebury <vbendeb at chromium.org>
    (cherry picked from commit 61528884ad2c0a8e146054bbfeb01a3bc73b9692)
    Signed-off-by: Marc Jones <marc.jones at se-eng.com>
    
    Change-Id: I936af5daa52a25f62133bdf9fb44f0b68cf34e88
    Reviewed-on: http://review.coreboot.org/8667
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer <stefan.reinauer at coreboot.org>


See http://review.coreboot.org/8667 for details.

-gerrit