linux-kernel - Re: 2.6.37-rc2-git4: Reported regressions 2.6.35 -> 2.6.36

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Date:	Fri, 19 Nov 2010 17:58:59 -0500
From:	Alex Deucher <alexdeucher@...il.com>
To:	Mark Lord <kernel@...savvy.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	DRI <dri-devel@...ts.freedesktop.org>,
	Florian Mickler <florian@...kler.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux PM List <linux-pm@...ts.linux-foundation.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>
Subject: Re: 2.6.37-rc2-git4: Reported regressions 2.6.35 -> 2.6.36

On Fri, Nov 19, 2010 at 5:55 PM, Mark Lord <kernel@...savvy.com> wrote:
> On 10-11-19 11:39 AM, Alex Deucher wrote:
>>
>> On Thu, Nov 18, 2010 at 7:47 PM, Mark Lord<kernel@...savvy.com>  wrote:
>>
>>> My non-Intel graphics notebook (has ATI X1400 graphics) also has a resume
>>> regression with 2.6.36.  But it does work fine with 2.6.35 (and earlier,
>>> back many years).  As a result, I'm stuck with 2.6.35 for the time being,
>>> and lack the time for a concerted debug effort on 2.6.36+ right now.
>>>
>>
>> Can you bisect?  Does this patch help?
>>
>> diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
>> index 8e421f6..05efb5b 100644
>> --- a/drivers/gpu/drm/radeon/atom.c
>> +++ b/drivers/gpu/drm/radeon/atom.c
>> @@ -112,6 +112,7 @@ static uint32_t atom_iio_execute(struct
>> atom_context *ctx, int base,
>>                         base += 3;
>>                         break;
>>                 case ATOM_IIO_WRITE:
>> +                       (void)ctx->card->ioreg_read(ctx->card, CU16(base +
>> 1));
>>                         ctx->card->ioreg_write(ctx->card, CU16(base + 1),
>> temp);
>>                         base += 3;
>>                         break;
>
> It now comes back at resume time.

So that patch helped?

>
> But suffers long delays (also sometimes with 2.6.35) doing this:
>
> [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs
> aborting
> [drm:atom_execute_table_locked] *ERROR* atombios stuck executing E576 (len
> 105, WS 12, PS 8) @ 0xE5C4
> [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs
> aborting
> [drm:atom_execute_table_locked] *ERROR* atombios stuck executing ECD2 (len
> 86, WS 4, PS 0) @ 0xED05
> [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs
> aborting
> [drm:atom_execute_table_locked] *ERROR* atombios stuck executing E576 (len
> 105, WS 12, PS 8) @ 0xE5C4
> PM: resume of devices complete after 15718.253 msecs
>

It's be nice if you could bisect to track down when those started.

> So I did this (local hack only, obviously NOT for mainline) to work around
> that issue:
>
> --- linux-2.6.36/drivers/gpu/drm/radeon/atom.c  2010-10-20
> 16:30:22.000000000 -0400
> +++ linux/drivers/gpu/drm/radeon/atom.c 2010-11-19 17:14:21.141807003 -0500
> @@ -1150,6 +1151,7 @@
>
>        if (!base)
>                return -EINVAL;
> +       if (base == 0xe576 || base == 0xecd2) return 0;  /* prevent freezes
> on Dell i9400 w/X1400 */
>
>        len = CU16(base + ATOM_CT_SIZE_PTR);
>        ws = CU8(base + ATOM_CT_WS_PTR);
>
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