Re: + efifb-dmi-set-video-type.patch added to -mm tree

[Peter Jones <pjones@redhat.com>]

On 03/30/2009 07:46 PM, Brian Maly wrote:
> Adding linux-fbdev-devel and Antonino Daplas to the CC list...
> 

Looks good to me.

Signed-of-by: Peter Jones <pjones@redhat.com>


> Brian
> 
> akpm@linux-foundation.org wrote:
>> The patch titled
>>      efifb: dmi set video type
>> has been added to the -mm tree.  Its filename is
>>      efifb-dmi-set-video-type.patch
>>
>> Before you just go and hit "reply", please:
>>    a) Consider who else should be cc'ed
>>    b) Prefer to cc a suitable mailing list as well
>>    c) Ideally: find the original patch on the mailing list and do a
>>       reply-to-all to that, adding suitable additional cc's
>>
>> *** Remember to use Documentation/SubmitChecklist when testing your
>> code ***
>>
>> See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
>> out what to do about this
>>
>> The current -mm tree may be found at
>> http://userweb.kernel.org/~akpm/mmotm/
>>
>> ------------------------------------------------------
>> Subject: efifb: dmi set video type
>> From: Brian Maly <bmaly@redhat.com>
>>
>> The current logic for dmi matching in efifb does not allow efifb to load
>> on all hardware that we can dmi match for.
>>
>> For a real world example, boot with elilo (3.7 or 3.8 vanilla) and on a
>> Apple (MacBook) and EFI framebuffer driver will not load (you will
>> have no
>> video).  This specific hardware is efi v1.10, so we have UGA and not
>> GOP. Without special bootloader magic (i.e.  extra elilo patches for UGA
>> graphics detection) no screen info will be passed to the kernel and as a
>> result efifb will not load.
>>
>> This patch allows the dmi match to happen by moving it to earlier in
>> efifb_init, and sets the video type (in set_system) so that efifb can
>> load
>> when we have a valid dmi match and already know the specifics of the
>> hardware.
>>
>> Without this patch the efifb driver will fail to load in the event screen
>> info is not found and passed in by the bootloader, being that we will
>> never get to look for a dmi match.  A primary reason for matching with
>> dmi
>> is because not all bootloaders detect the video info properly.  The
>> solution is that in the event of a dmi match, we should set
>> screen_info.orig_video_isVGA.  Most bootloaders fail to set screen
>> info on
>> Apple hardware, and this is a big problem for people who use Apple
>> hardware.
>>
>> Tested on a MacBook SantaRosa with elilo-3.8 (vanilla) and resolves the
>> issue, the dmi match now works, EFI framebuffer now loads and video
>> works.
>>
>> Signed-off-by: Brian Maly <bmaly@redhat.com>
>> Acked-by: Huang Ying <ying.huang@intel.com>
>> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
>> Cc: Chandramouli Narayanan <mouli@linux.intel.com>
>> Cc: Peter Jones <pjones@redhat.com>
>> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
>> ---
>>
>>  drivers/video/efifb.c |    5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff -puN drivers/video/efifb.c~efifb-dmi-set-video-type
>> drivers/video/efifb.c
>> --- a/drivers/video/efifb.c~efifb-dmi-set-video-type
>> +++ a/drivers/video/efifb.c
>> @@ -129,6 +129,8 @@ static int set_system(const struct dmi_s
>>          screen_info.lfb_width = info->width;
>>      if (screen_info.lfb_height == 0)
>>          screen_info.lfb_height = info->height;
>> +    if (screen_info.orig_video_isVGA == 0)
>> +        screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
>>  
>>      return 0;
>>  }
>> @@ -374,9 +376,10 @@ static int __init efifb_init(void)
>>      int ret;
>>      char *option = NULL;
>>  
>> +    dmi_check_system(dmi_system_table);
>> +
>>      if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
>>          return -ENODEV;
>> -    dmi_check_system(dmi_system_table);
>>  
>>      if (fb_get_options("efifb", &option))
>>          return -ENODEV;
>> _
>>
>> Patches currently in -mm which might be from bmaly@redhat.com are
>>
>> efifb-dmi-set-video-type.patch
>>
>>   

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