On Sat, Oct 03, 2015 at 02:21:00PM -0300, Fabio Estevam wrote:
From: Fabio Estevam fabio.estevam@freescale.com
Since commit 623d96e89aca6("imx: wdog: correct wcr register settings") issuing a 'reset' command causes the system to hang.
Unlike i.MX and Vybrid, the watchdog controller on LS102x is big-endian.
This means that the watchdog on LS1021 has been working by accident as it does not use the big-endian accessors in drivers/watchdog/imx_watchdog.c. Commit 623d96e89aca6("imx: wdog: correct wcr register settings") only revelead the endianness problem on LS102x.
In order to fix the reset hang, introduce a reset_cpu() implementation that is specific for ls102x, which accesses the watchdog WCR register in big-endian format. All that is required to reset LS102x is to clear the SRS bit.
This approach is a temporary workaround to avoid a regression for LS102x in the 2015.10 release. The proper fix is to make the watchdog driver endian-aware, so that it can work for i.MX, Vybrid and LS102x.
Reported-by: Sinan Akman sinan@writeme.com Tested-by: Sinan Akman sinan@writeme.com Reviewed-by: Wolfgang Denk wd@denx.de Signed-off-by: Fabio Estevam fabio.estevam@freescale.com
Applied to u-boot/master, thanks!