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From: "Christian König" <christian.koenig@amd.com>
To: Thomas Zimmermann <tzimmermann@suse.de>,
	daniel@ffwll.ch, airlied@linux.ie, mripard@kernel.org,
	maarten.lankhorst@linux.intel.com, javierm@redhat.com,
	noralf@tronnes.org
Cc: dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v2 0/5] drm: Ignore non-existing color planes in helpers
Date: Tue, 17 May 2022 13:56:01 +0200	[thread overview]
Message-ID: <d9d8a396-cb1f-054f-1309-c483dc1724f1@amd.com> (raw)
In-Reply-To: <20220517113327.26919-1-tzimmermann@suse.de>

Am 17.05.22 um 13:33 schrieb Thomas Zimmermann:
> Some DRM helpers assume that all potential color planes of a framebuffer
> are available; even if the color format didn't specify them. Non-existing
> planes are silently ignored. This behavior is inconsistent with other
> helpers and apparently leads to subtle bugs with uninitialized GEM buffer
> mappings. [1]
>
> Change all affected code to look at the framebuffer format's number of
> color planes and only process these planes. The update has been discussed
> in [2] before.
>
> Tested with GEM SHMEM helpers on simpledrm and with GEM VRAM helpers on
> ast.

I'm not deep enough into all the details for a full review, but feel 
free to add an Acked-by: Christian König <christian.koenig@amd.com> to 
the series.

Thanks,
Christian.

>
> v2:
> 	* refactor GEM VRAM code before fixing it (Javier)
> 	* print more error information in #1 (Javier)
> 	* commit-message fixes (Javier)
>
> [1] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fdri-devel%2F20210730183511.20080-1-tzimmermann%40suse.de%2FT%2F%23md0172b10bb588d8f20f4f456e304f08d2a4505f7&amp;data=05%7C01%7Cchristian.koenig%40amd.com%7Cc512a92c206f4af0691108da37f915a1%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637883840259373791%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=6fXRY%2BWlo1I47tcuRHiamAZ9JGM%2FHaYTfyGnxNrqUts%3D&amp;reserved=0
> [2] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fdri-devel%2F877dc0d9-c6c6-022c-20d8-14b33e863934%40suse.de%2F&amp;data=05%7C01%7Cchristian.koenig%40amd.com%7Cc512a92c206f4af0691108da37f915a1%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637883840259373791%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=6iFYw5EtQNaSiPrHIAawBw87lj6M66o7j0ADY0ipifs%3D&amp;reserved=0
>
> Thomas Zimmermann (5):
>    drm/gem: Share code between drm_gem_fb_{begin,end}_cpu_access()
>    drm/gem: Ignore color planes that are unused by framebuffer format
>    drm/gem-vram: Share code between GEM VRAM's _{prepare,cleanup}_fb()
>    drm/gem-vram: Ignore planes that are unused by framebuffer format
>    drm/gem: Warn on trying to use a non-existing framebuffer plane
>
>   drivers/gpu/drm/drm_gem_atomic_helper.c      |   6 +-
>   drivers/gpu/drm/drm_gem_framebuffer_helper.c | 104 +++++++++----------
>   drivers/gpu/drm/drm_gem_vram_helper.c        |  54 ++++++----
>   include/drm/drm_gem_framebuffer_helper.h     |  10 +-
>   4 files changed, 92 insertions(+), 82 deletions(-)
>


  parent reply	other threads:[~2022-05-17 11:56 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-17 11:33 [PATCH v2 0/5] drm: Ignore non-existing color planes in helpers Thomas Zimmermann
2022-05-17 11:33 ` [PATCH v2 1/5] drm/gem: Share code between drm_gem_fb_{begin, end}_cpu_access() Thomas Zimmermann
2022-05-17 11:33 ` [PATCH v2 2/5] drm/gem: Ignore color planes that are unused by framebuffer format Thomas Zimmermann
2022-05-17 11:33 ` [PATCH v2 3/5] drm/gem-vram: Share code between GEM VRAM's _{prepare, cleanup}_fb() Thomas Zimmermann
2022-05-18  8:07   ` [PATCH v2 3/5] drm/gem-vram: Share code between GEM VRAM's _{prepare,cleanup}_fb() Javier Martinez Canillas
2022-05-17 11:33 ` [PATCH v2 4/5] drm/gem-vram: Ignore planes that are unused by framebuffer format Thomas Zimmermann
2022-05-17 11:33 ` [PATCH v2 5/5] drm/gem: Warn on trying to use a non-existing framebuffer plane Thomas Zimmermann
2022-05-17 11:56 ` Christian König [this message]
2022-05-18  8:17   ` [PATCH v2 0/5] drm: Ignore non-existing color planes in helpers Thomas Zimmermann

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