linux-kernel - Re: [PATCH] Revert "drm/i915: fix vblank wait test condition"

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Date:	Sun, 5 Sep 2010 19:40:06 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Sven Joachim <svenjoac@....de>, Hugh Dickins <hughd@...gle.com>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sitsofe Wheeler <sitsofe@...oo.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] Revert "drm/i915: fix vblank wait test condition"

On Sun, 05 Sep 2010 19:11:16 +0300, Pekka Enberg <penberg@...nel.org> wrote:
>> Is someone picking this patch up or am I supposed to send it to Linus?

On Sun, Sep 5, 2010 at 7:23 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> I have applied this patch to
>
> http://cgit.freedesktop.org/~ickle/drm-intel/
>
> Thanks.

The "drm-intel" branch on top of 2.6.36-rc3 works OK on my machine. I
do see the following errors in dmesg but they seem to be harmless:

[    1.004937] render error detected, EIR: 0x00000010
[    1.004981] page table error
[    1.005018]   PGTBL_ER: 0x00000102
[    1.005058] [drm:i915_report_and_clear_eir] *ERROR* EIR stuck:
0x00000010, masking
[    1.005139] render error detected, EIR: 0x00000010
[    1.005194] page table error
[    1.005244]   PGTBL_ER: 0x00000102
[    1.660043] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.

[snip]

[    4.950117] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[    5.176515] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[    5.420040] usb 5-1: new full speed USB device using uhci_hcd and address 3
[    5.570066] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[    5.776699] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[    7.830162] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[    8.036329] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[    8.412362] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[    8.616325] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[    8.992369] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[    9.196325] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[   14.250106] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[   14.456280] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[   14.852445] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[   15.054263] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[   15.432298] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[   15.636248] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[   16.560078] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.
[   16.766246] [drm:intel_calculate_wm] *ERROR* Insufficient FIFO for
plane, expect flickering: entries required = 36, available = 31.

                        Pekka
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