[PATCH] ARM: OMAP4: hwmod: Fix SOFTRESET logic for OMAP4
nm at ti.com
Wed Feb 5 12:41:31 EST 2014
2014-02-05 Grygorii Strashko <grygorii.strashko at ti.com>:
> Hi All,
> On 02/05/2014 05:06 PM, Illia Smyrnov wrote:
>> Commit 313a76e (ARM: OMAP2+: hwmod: Fix SOFTRESET logic) introduced
>> softreset bit cleaning right after set one. It is caused L3 error for
>> OMAP4 ISS because ISS register write occurs when ISS reset process is in
>> progress. Avoid this situation by cleaning softreset bit later, when reset
>> process is successfully finished.
> I'd like to mention that this issue has been caught while upgrading
> custom Linux Kernel 3.4 to the last Stable Kernel linux-3.4.y.
> So, the same OMAP4+ functionality can be broken in all Stable trees
> where commit "ARM: OMAP2+: hwmod: Fix SOFTRESET logic" was merged to.
> On OMAP4+ we should always try to wait until IP reset is finished before proceed.
> Reviewed-by: "Grygorii Strashko <grygorii.strashko at ti.com>"
> Error log example (k3.4):
Thanks - I for a moment thought it was on newer kernels :).
Looping in Dan who is currently looking at reset driver replacement
for existing hwmod based reset solution.
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