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Re: [PATCH v3 1/2] ath9k_hw: Fix incorrect macversion and macrev checks

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On Wed, Dec 22, 2010 at 9:04 PM, Senthil Balasubramanian
<senthilkumar@xxxxxxxxxxx> wrote:
> On Thu, Dec 23, 2010 at 07:25:42AM +0530, Senthilkumar Balasubramanian wrote:
>> On Wed, Dec 22, 2010 at 09:22:06PM +0530, Luis R. Rodriguez wrote:
>> > On Wed, Dec 22, 2010 at 10:44 AM, Senthil Balasubramanian
>> > <senthilkumar@xxxxxxxxxxx> wrote:
>> > > There are few places where we are checking for macversion and revsions
>> > > before RTC is powered ON. However we are reading the macversion and
>> > > revisions only after RTC is powered ON and so both macversion and
>> > > revisions are actully zero and this leads to incorrect srev checks
>> > >
>> > > Incorrect srev checks can cause registers to be configured wrongly and can
>> > > cause unexpected behavior. Fixing this seems to address the ASPM issue that
>> > > we have observed. The laptop becomes very slow and hangs mostly with ASPM L1
>> > > enabled without this fix.
>> >
>> > On what chipset? Or did we see this on one chipset and suspect it can
>> > affect others?
>> We have noticed on Merlin and it is obviously incorrect for other chipsets
> This should be read as "we have noticed this issue with ar9380/ar9382"

The reason I asked about the chipset is ar9380 stuff won't be relevant
for longterm 2.6.35.

  Luis
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