https://github.com/torvalds/linux
Revision ff88b4724fde18056a4c539f7327389aec0f4c2d authored by Sergei Ianovich on 10 December 2013, 04:39:15 UTC, committed by Olof Johansson on 12 December 2013, 00:35:16 UTC
Erratum 71 of PXA270M Processor Family Specification Update
(April 19, 2010) explains that watchdog reset time is just
8us insead of 10ms in EMTS.

If SDRAM is not reset, it causes memory bus congestion and
the device hangs. We put SDRAM in selfresh mode before watchdog
reset, removing potential freezes.

Without this patch PXA270-based ICP DAS LP-8x4x hangs after up to 40
reboots. With this patch it has successfully rebooted 500 times.

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>
Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Olof Johansson <olof@lixom.net>
1 parent 506cac1
History
Tip revision: ff88b4724fde18056a4c539f7327389aec0f4c2d authored by Sergei Ianovich on 10 December 2013, 04:39:15 UTC
ARM: pxa: prevent PXA270 occasional reboot freezes
Tip revision: ff88b47
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