PXA270 overlay problem

[Marek Vasut]

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?