linux-kernel - Re: [PATCH v3 6/9] radeon: Switch to arch_phys_wc_add and add a missing ...

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Message-ID: <CAH3drwY0vVGnf05v-coSmS4OQyHuufycLojEn9que6iL_r3AUw@mail.gmail.com>
Date:	Thu, 16 May 2013 09:50:01 -0400
From:	Jerome Glisse <j.glisse@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Alex Deucher <alexdeucher@...il.com>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...il.com>
Subject: Re: [PATCH v3 6/9] radeon: Switch to arch_phys_wc_add and add a
 missing ..._del

On Wed, May 15, 2013 at 2:22 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Wed, May 15, 2013 at 7:49 AM, Jerome Glisse <j.glisse@...il.com> wrote:
>> On Tue, May 14, 2013 at 5:35 PM, Andy Lutomirski <luto@...capital.net> wrote:
>>> On Tue, May 14, 2013 at 6:37 AM, Jerome Glisse <j.glisse@...il.com> wrote:
>>>> On Tue, May 14, 2013 at 8:58 AM, Alex Deucher <alexdeucher@...il.com> wrote:
>>>>> On Mon, May 13, 2013 at 7:58 PM, Andy Lutomirski <luto@...capital.net> wrote:
>>>>>> Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
>>>>>> Signed-off-by: Andy Lutomirski <luto@...capital.net>
>>>>>
>>>>> Reviewed-by: Alex Deucher <alexander.deucher@....com>
>>>>
>>>> I believe it will break something but we could deal with the fallout
>>>> once it happens.
>>>
>>> FWIW, I'm running with this code on my machine right now using the
>>> radeon driver.  Everything seems fine.  If I build without MTRRs and
>>> without PAT, though, graphics are slow (as expected).  So I think
>>> everything's okay.
>>>
>>> --Andy
>>
>> I am worried on p4 where i last see issue with that notably with agp.
>
> Do you remember any details?  It looks like PAT is enabled on Pentium
> 4 (i.e. famliy 0xF).
>
> --Andy

No i don't, i think it was some pat errata on those about non real ram
address and with agp. Memory is fuzzy. I might have time in couple of
week to plug back my p4 and see how it behave.

Cheers,
Jerome
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