From mboxrd@z Thu Jan  1 00:00:00 1970
From: anarsoul@gmail.com (Vasily Khoruzhick)
Date: Mon, 31 Jan 2011 14:35:02 +0200
Subject: PXA270 overlay problem
In-Reply-To: <201101311337.16622.marek.vasut@gmail.com>
References: <201101262246.01164.anarsoul@gmail.com>
	<201101311337.16622.marek.vasut@gmail.com>
Message-ID: <201101311435.03185.anarsoul@gmail.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Monday 31 January 2011 14:37:16 Marek Vasut wrote:
> On Wednesday 26 January 2011 21:46:00 Vasily Khoruzhick wrote:
> > Hi, I'm experiencing problems with overlay1/overlay2 on PXA270 using
> > pxafb driver. Main problem is overlays just don't work for some reason,
> > and even more - after enabling any overlay something weird happens (LCD
> > blinks for a 0.5 second, and then main plane comes back, no overlay
> > plane is visible), I'm getting following messages on dmesg:
> > 
> > [   93.679574] overlay1fb_disable: timeout disabling overlay1
> > [   95.601537] BUG: Bad page state in process sh  pfn:a1b60
> > [   95.601645] page:c0456c00 count:0 mapcount:0 mapping:  (null)
> > index:0x0 [   95.601698] page flags: 0x200(arch_1)
> > [   95.601917] [<c0029610>] (unwind_backtrace+0x0/0xe4) from [<c0073088>]
> > (bad_page+0xc8/0xf4)
> > [   95.602042] [<c0073088>] (bad_page+0xc8/0xf4) from [<c0074088>]
> > (get_page_from_freelist+0x378/0x494)
> > [   95.602167] [<c0074088>] (get_page_from_freelist+0x378/0x494) from
> > [<c007426c>] (__alloc_pages_nodemask+0xc8/0x50c)
> > [   95.602290] [<c007426c>] (__alloc_pages_nodemask+0xc8/0x50c) from
> > [<c00746c0>] (__get_free_pages+0x10/0x3c)
> > [   95.602424] [<c00746c0>] (__get_free_pages+0x10/0x3c) from
> > [<c002b780>] (pgd_alloc+0x14/0xd0)
> > [   95.602581] [<c002b780>] (pgd_alloc+0x14/0xd0) from [<c0036ce0>]
> > (mm_init.clone.54+0x98/0xd8)
> > [   95.602702] [<c0036ce0>] (mm_init.clone.54+0x98/0xd8) from
> > [<c0036edc>] (dup_mm+0x60/0x4e0)
> > [   95.602819] [<c0036edc>] (dup_mm+0x60/0x4e0) from [<c0037a60>]
> > (copy_process+0x6cc/0xde4)
> > [   95.602933] [<c0037a60>] (copy_process+0x6cc/0xde4) from [<c00382fc>]
> > (do_fork+0x160/0x334)
> > [   95.603042] [<c00382fc>] (do_fork+0x160/0x334) from [<c002804c>]
> > (sys_fork+0x20/0x24)
> > [   95.603196] [<c002804c>] (sys_fork+0x20/0x24) from [<c0024fc0>]
> > (ret_fast_syscall+0x0/0x2c)
> > [   95.603264] Disabling lock debugging due to kernel taint
> > [   95.607171] BUG: Bad page state in process sh  pfn:a1b64
> > [   95.607282] page:c0456c80 count:0 mapcount:0 mapping:  (null)
> > index:0x0 [   95.607335] page flags: 0x200(arch_1)
> > [   95.607556] [<c0029610>] (unwind_backtrace+0x0/0xe4) from [<c0073088>]
> > (bad_page+0xc8/0xf4)
> > [   95.607680] [<c0073088>] (bad_page+0xc8/0xf4) from [<c0074088>]
> > (get_page_from_freelist+0x378/0x494)
> > [   95.607805] [<c0074088>] (get_page_from_freelist+0x378/0x494) from
> > [<c007426c>] (__alloc_pages_nodemask+0xc8/0x50c)
> > [   95.607955] [<c007426c>] (__alloc_pages_nodemask+0xc8/0x50c) from
> > [<c0083890>] (__pte_alloc+0x20/0x1a4)
> > [   95.608080] [<c0083890>] (__pte_alloc+0x20/0x1a4) from [<c0084864>]
> > (copy_page_range+0xf4/0x42c)
> > [   95.608236] [<c0084864>] (copy_page_range+0xf4/0x42c) from
> > [<c0037178>] (dup_mm+0x2fc/0x4e0)
> > [   95.608355] [<c0037178>] (dup_mm+0x2fc/0x4e0) from [<c0037a60>]
> > (copy_process+0x6cc/0xde4)
> > [   95.608471] [<c0037a60>] (copy_process+0x6cc/0xde4) from [<c00382fc>]
> > (do_fork+0x160/0x334)
> > [   95.608580] [<c00382fc>] (do_fork+0x160/0x334) from [<c002804c>]
> > (sys_fork+0x20/0x24)
> > [   95.608735] [<c002804c>] (sys_fork+0x20/0x24) from [<c0024fc0>]
> > (ret_fast_syscall+0x0/0x2c)
> > 
> > And kernel hangs in few minutes after that.
> > 
> > Sample code is attached, it tries to enable 1st overlay and fill it with
> > some color.
> > 
> > Any ideas what can be wrong?
> > 
> > Regards
> > Vasily
> 
> Do you -- by any chance -- have any weird changes to the pxafb driver?

Nope, no changes to pxafb driver.