Commit ff88b472 authored Dec 10, 2013 by Sergei Ianovich Committed by Olof Johansson Dec 11, 2013

ARM: pxa: prevent PXA270 occasional reboot freezes



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>

parent 506cac15

arch/arm/mach-pxa/reset.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@

		#include <mach/regs-ost.h>
		#include <mach/reset.h>
		#include <mach/smemc.h>

		unsigned int reset_status;
		EXPORT_SYMBOL(reset_status);
		@@ -81,6 +82,12 @@ static void do_hw_reset(void)
		writel_relaxed(OSSR_M3, OSSR);
		/* ... in 100 ms */
		writel_relaxed(readl_relaxed(OSCR) + 368640, OSMR3);
		/*
		* SDRAM hangs on watchdog reset on Marvell PXA270 (erratum 71)
		* we put SDRAM into self-refresh to prevent that
		*/
		while (1)
		writel_relaxed(MDREFR_SLFRSH, MDREFR);
		}

		void pxa_restart(enum reboot_mode mode, const char *cmd)
		@@ -104,4 +111,3 @@ void pxa_restart(enum reboot_mode mode, const char *cmd)
		break;
		}
		}