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Groups > linux.kernel > #1631811
| From | Michel Dänzer <michel@daenzer.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format |
| Date | 2017-04-27 03:00 +0200 |
| Message-ID | <tAFWO-1s3-9@gated-at.bofh.it> (permalink) |
| References | (1 earlier) <tzFFv-3rT-1@gated-at.bofh.it> <tzZbb-7xO-13@gated-at.bofh.it> <tAo9A-6v2-9@gated-at.bofh.it> <tArAu-oA-13@gated-at.bofh.it> <tAu5j-2ac-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 26/04/17 09:11 PM, Gerd Hoffmann wrote:
> Hi,
>
>>>> Just to reiterate, this won't work for the radeon driver, which programs
>>>> the GPU to use (effectively, per the current definition that these are
>>>> little endian GPU formats) DRM_FORMAT_XRGB8888 with pre-R600 and
>>>> DRM_FORMAT_BGRX8888 with >= R600.
>>>
>>> Hmm, ok, how does bigendian fbdev emulation work on pre-R600 then?
>>
>> Using a GPU byte swapping mechanism which only affects CPU access to
>> video RAM.
>
> That is done using the RADEON_TILING_SWAP_{16,32}BIT flag mentioned in
> another thread?
Right.
> What about dumb bos? You've mentioned the swap flag isn't used for
> those. Which implies they are in little endian byte order (both gpu and
> cpu view).
Right, AFAICT from looking at the code.
> Does the modesetting driver work correctly on that hardware?
Not sure.
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Michel Dänzer <michel@daenzer.net> - 2017-04-25 05:20 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Ville Syrjälä <ville.syrjala@linux.intel.com> - 2017-04-25 12:00 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Michel Dänzer <michel@daenzer.net> - 2017-04-26 04:10 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Ville Syrjälä <ville.syrjala@linux.intel.com> - 2017-04-26 16:40 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Gerd Hoffmann <kraxel@redhat.com> - 2017-04-26 08:00 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Michel Dänzer <michel@daenzer.net> - 2017-04-26 11:40 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Gerd Hoffmann <kraxel@redhat.com> - 2017-04-26 14:20 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Michel Dänzer <michel@daenzer.net> - 2017-04-27 03:00 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Gerd Hoffmann <kraxel@redhat.com> - 2017-04-27 08:50 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Michel Dänzer <michel@daenzer.net> - 2017-04-27 09:10 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Gerd Hoffmann <kraxel@redhat.com> - 2017-04-28 12:10 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Eric Engestrom <eric.engestrom@imgtec.com> - 2017-04-26 15:30 +0200
Re: [PATCH 3/6] drm: fourcc byteorder: add bigendian support to drm_mode_legacy_fb_format Gerd Hoffmann <kraxel@redhat.com> - 2017-04-26 16:00 +0200
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