Hi Louis,
> This patchset is the second version of [1]. It is almost a complete
> rewrite to use a line-by-line algorithm for the composition.
>
> It can be divided in multiple parts:
> - PATCH 1 to 3: no functional change is intended, only some formatting and
> documenting (PATCH 2 is taken from [2])
> - PATCH 4 to 7: Some preparation work not directly related to the
> line-by-line algorithm
> - PATCH 8: main patch for this series, it reintroduce the
> line-by-line algorithm
> - PATCH 9: Remove useless drm_simplify_rotation
> - Rest of the series: moved to a new series to merge this one, see the new
> series "Add YUV ad R1..8 formats support to VKMS"
>
> The PATCH 8 aims to restore the line-by-line pixel reading algorithm. It
> was introduced in 8ba1648567e2 ("drm: vkms: Refactor the plane composer to
> accept new formats") but removed in 8ba1648567e2 ("drm: vkms: Refactor the
> plane composer to accept new formats") in a over-simplification effort.
> At this time, nobody noticed the performance impact of this commit. After
> the first iteration of my series, poeple notice performance impact, and it
> was the case. Pekka suggested to reimplement the line-by-line algorithm.
>
> Expiriments on my side shown great improvement for the line-by-line
> algorithm, and the performances are the same as the original line-by-line
> algorithm. I targeted my effort to make the code working for all the
> rotations and translations. The usage of helpers from drm_rect_* avoid
> reimplementing existing logic.
>
> The only "complex" part remaining is the clipping of the coordinate to
> avoid reading/writing outside of src/dst. Thus I added a lot of comments
> to help when someone will want to add some features (framebuffer resizing
> for example).
>
> I did not changed any expected test results as VKMS seems to have some
> existing issue:
> https://gitlab.freedesktop.org/jim.cromie/kernel-drm-next-dd/-/jobs/61484201
> https://gitlab.freedesktop.org/jim.cromie/kernel-drm-next-dd/-/jobs/61803193
> https://gitlab.freedesktop.org/louischauvet/kernel/-/jobs/65944002
>
> To properly test the rotation algorithm, I had to implement a new IGT
> test [8]. This helped to found one issue in the YUV rotation algortihm.
>
> My series was mainly tested with:
> - kms_plane (for color conversions)
> - kms_rotation_crc (for a subset of rotation and formats)
> - kms_rotation (to test all rotation and formats combinations) [8]
> - kms_cursor_crc (for translations)
> The benchmark used to measure the improvment was done with
> kms_fb_stress [10] with some modifications:
> - Fixing the writeback format to XRGB8888
> - Using a primary plane with odd dimension to avoid failures due to YUV
> alignment
> The KMS structure was:
> CRTC:
> rectangle: 4096x2160+0+0
> primary:
> format: ABGR16161616
> rectangle: 3640x2160+101+0
> writeback:
> format: XRGB8888
> rectangle: 4096x2160+0+0
> Results (on my computer):
>
> 8356b9790650: drm/test: Add test cases for drm_rect_rotate_inv() (before any regression)
> 322d716a3e8a: drm/vkms: isolate pixel conversion functionality (first regression)
> cc4fd2934d41: drm/vkms: Isolate writeback pixel conversion functions (second regression)
> 2c3d1bd284c5: drm/panel: simple: Add Microtips Technology MF-103HIEB0GA0 panel (current drm-misc-next)
>
> Used format | This series | 2c3d1bd284c5 | cc4fd2934d41 | 322d716a3e8a | 8356b9790650 |
> --------------+-------------+--------------+--------------+--------------+--------------+
> XRGB8888 | 13.261666s | 14.289582s | 10.731272s | 9.480001s | 9.277507s |
> XRGB16161616 | 13.282479s | 13.918926s | 10.712616s | 9.776903s | 9.291766s |
> RGB565 | 136.154163s | 141.646489s | 101.744050s | 103.712164s | 87.860923s |
>
> This is a 5-10% improvment of the performance. More work need to be done
> on the writeback to gain more.
>
> [1]: https://lore.kernel.org/all/20240201-yuv-v1-0-3ca376f27632@bootlin.com
> [2]: https://lore.kernel.org/all/20240110-vkms-yuv-v2-0-952fcaa5a193@riseup.net/
> [3]: https://lore.kernel.org/all/20240110-vkms-yuv-v2-3-952fcaa5a193@riseup.net/
> [4]: https://lore.kernel.org/all/20240110-vkms-yuv-v2-5-952fcaa5a193@riseup.net/
> [5]: https://lore.kernel.org/all/20240110-vkms-yuv-v2-6-952fcaa5a193@riseup.net/
> [6]: https://lore.kernel.org/all/20240110-vkms-yuv-v2-7-952fcaa5a193@riseup.net/
> [8]: https://lore.kernel.org/r/20240313-new_rotation-v2-0-6230fd5cae59@bootlin.com
> [9]: https://lore.kernel.org/dri-devel/20240306-louis-vkms-conv-v1-1-5bfe7d129fdd@riseup.net/
> [10]: https://lore.kernel.org/all/20240422-kms_fb_stress-dev-v5-0-0c577163dc88@riseup.net/
>
> To: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
> To: Melissa Wen <melissa.srw@gmail.com>
> To: Maíra Canal <mairacanal@riseup.net>
> To: Haneen Mohammed <hamohammed.sa@gmail.com>
> To: Daniel Vetter <daniel@ffwll.ch>
> To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> To: Maxime Ripard <mripard@kernel.org>
> To: Thomas Zimmermann <tzimmermann@suse.de>
> To: David Airlie <airlied@gmail.com>
> To: rdunlap@infradead.org
> To: arthurgrillo@riseup.net
> To: Jonathan Corbet <corbet@lwn.net>
> To: pekka.paalanen@haloniitty.fi
> Cc: dri-devel@lists.freedesktop.org
> Cc: linux-kernel@vger.kernel.org
> Cc: jeremie.dautheribes@bootlin.com
> Cc: miquel.raynal@bootlin.com
> Cc: thomas.petazzoni@bootlin.com
> Cc: seanpaul@google.com
> Cc: marcheu@google.com
> Cc: nicolejadeyee@google.com
> Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
Thanks for working on this. I reviewed the series and, with the exception of
a couple of *very* minor comments, it looks good to me.
Feel free to add to the entire series:
Reviewed-by: José Expósito <jose.exposito89@gmail.com>
> Changes in v13:
> - Removed the YUV part to prepare the merge
> - Add Acked-by from Maíra
> - Link to v12: https://lore.kernel.org/r/20241007-yuv-v12-0-01c1ada6fec8@bootlin.com
> Changes in v12:
> - Fix documentation issues as suggested by Randy
> - Link to v11: https://lore.kernel.org/r/20240930-yuv-v11-0-4b1a26bcfc96@bootlin.com
> Changes in v11:
> - Remove documentation patch (already merged)
> - Fix sparse warning about documentation
> - Link to v10: https://lore.kernel.org/r/20240809-yuv-v10-0-1a7c764166f7@bootlin.com
> Changes in v10:
> - Properly remove the patch introducing dummy read/write functions
> - PATCH 8/16: Format fixups
> - PATCH 9/16: Format fixups
> - PATCH 11/16: Format fixups
> - PATCH 14/16: Fix test compilation, add module description
> - Link to v9: https://lore.kernel.org/r/20240802-yuv-v9-0-08a706669e16@bootlin.com
> Changes in v9:
> - PATCH 3/17: Fix docs as Maíra suggested
> - PATCH 4,6,10,12,15,17/17: Fix sparse warning about __le16 casting
> - Link to v8: https://lore.kernel.org/all/20240516-yuv-v8-0-cf8d6f86430e@bootlin.com/
> Changes in v8:
> - PATCH 7/17: Update pitch access to use the proper value for block
> formats
> - PATCH 9/17: Update pitch access to use the proper value for block
> formats
> - Link to v7: https://lore.kernel.org/r/20240513-yuv-v7-0-380e9ffec502@bootlin.com
> Changes in v7:
> - Some typos and indent fixes
> - Add Review-By, Acked-By
> - PATCH 3/17: Clarify src/dst unit
> - PATCH 9/17: Clarify documentation
> - PATCH 9/17: Restrict conditions for direction
> - PATCH 9/17: Rename get_block_step_byte to get_block_step_bytes
> - PATCH 10/17: Clarify kernel doc for clamp_line_coordinates, blend_line,
> pixel_read_line_t
> - PATCH 10/17: Fix the case when src_*_start >= fb->width/height
> - PATCH 10/17: Change y in blend to be an int
> - PATCH 10/17: Clarify documentation for read functions
> - PATCH 12/17: Fix the type of rgb variables in argb_u16_from_yuv888
> - PATCH 12/17: Move comments at the right place, remove useless ones
> - PATCH 12/17: Add missing const
> - PATCH 17/17: Use drm_format_info_bpp and computation to avoid hard-coded
> values
> - Link to v6: https://lore.kernel.org/r/20240409-yuv-v6-0-de1c5728fd70@bootlin.com
> Changes in v6:
> - Add Randy
> - Add Review-By and Acked-By
> - PATCH 2/17: Remove useless newline
> - PATCH 3/17: Fix kernel doc
> - PATCH 4/17: Fix typo in git commit
> - PATCH 4/17: Fix kernel doc and simplify brief description of typedef
> - PATCH 5/17: Change black default color to Magenta
> - PATCH 5/17: Fix wording in comment
> - PATCH 7/17: Fix typo in packed_pixel_offset
> - PATCH 7/17: Add WARN_ON for currently not supported formats
> - PATCH 8/17: Rename x_limit to pixel_count
> - PATCH 8/17: Clarify kernel doc for pre_mul_alpha_blend
> - PATCH 9/17: Rename get_step_next_block to get_block_step_bytes
> - PATCH 9/17: Change kernel doc order
> - PATCH 9/17: Rework the direction_for_rotation function to use drm
> helpers
> - PATCH 9/17: Add a warn in direction_for_rotation if the result is not
> expected
> - PATCH 10/17: Reword the comment of pixel color conversion functions
> - PATCH 10/17: Refactor the blending function to extract functions
> - PATCH 11/17: Remove useless drm_rotation_simplify
> - PATCH 12/17: Fix typo in comments
> - PATCH 12/17: Remove useless define
> - PATCH 12/17: Fix some comments typo and kernel doc
> - PATCH 12/17: Add a comma at the end of the vkms_formats list
> - PATCH 12/17: Use copy of matrix instead of pointers
> - PATCH 12/17: Use 16 bit range for yuv conversion
> - PATCH 17/17: Add a comma at the end of the vkms_formats list
> - PATCH 17/17: Add assertions
> - PATCH 17/17: Fix color conversion... Next time I will read the doc
> twice...
> - Link to v5: https://lore.kernel.org/r/20240313-yuv-v5-0-e610cbd03f52@bootlin.com
> Changes in v5:
> - All patches: fix some formatting issues
> - PATCH 4/16: Use the correct formatter for 4cc code
> - PATCH 7/16: Update the pixel accessors to also return the pixel position
> inside a block.
> - PATCH 8/16: Fix a temporary bug
> - PATCH 9/16: Update the get_step_1x1 to get_step_next_block and update
> the documentation
> - PATCH 10/16: Update to uses the new pixel accessors
> - PATCH 10/16: Reword some comments
> - PATCH 11/16: Update to use the new pixel accessors
> - PATCH 11/16: Fix a bug in the subsampling offset for inverted reading
> (right to left/bottom to top). Found by [8].
> - PATCH 11/16: Apply Arthur's modifications (comments, algorithm
> clarification)
> - PATCH 11/16: Use the correct formatter for 4cc code
> - PATCH 11/16: Update to use the new get_step_next_block
> - PATCH 14/16: Apply Arthur's modification (comments, compilation issue)
> - PATCH 15/16: Add Arthur's patch to explain the kunit tests
> - PATCH 16/16: Introduce DRM_FORMAT_R* support.
> - Link to v4: https://lore.kernel.org/r/20240304-yuv-v4-0-76beac8e9793@bootlin.com
> Changes in v4:
> - PATCH 3/14: Update comments for get_pixel_* functions
> - PATCH 4/14: Add WARN when trying to get unsupported pixel_* functions
> - PATCH 5/14: Create dummy pixel reader/writer to avoid NULL
> function pointers and kernel OOPS
> - PATCH 6/14: Added the usage of const pointers when needed
> - PATCH 7/14: Extraction of pixel accessors modification
> - PATCH 8/14: Extraction of the blending function modification
> - PATCH 9/14: Extraction of the pixel_read_direction enum
> - PATCH 10/14: Update direction_for_rotation documentation
> - PATCH 10/14: Rename conversion functions to be explicit
> - PATCH 10/14: Replace while(count) by while(out_pixel<end) in read_line
> callbacks. It avoid a new variable+addition in the composition hot path.
> - PATCH 11/14: Rename conversion functions to be explicit
> - PATCH 11/14: Update the documentation for get_subsampling_offset
> - PATCH 11/14: Add the matrix_conversion structure to remove a test from
> the hot path.
> - PATCH 11/14: Upadate matrix values to use 32.32 fixed floats for
> conversion
> - PATCH 12/14: Update commit message
> - PATCH 14/14: Change kunit expected value
> - Link to v3: https://lore.kernel.org/r/20240226-yuv-v3-0-ff662f0994db@bootlin.com
> Changes in v3:
> - Correction of remaining git-rebase artefacts
> - Added Pekka in copy of this patch
> - Link to v2: https://lore.kernel.org/r/20240223-yuv-v2-0-aa6be2827bb7@bootlin.com
> Changes in v2:
> - Rebased the series on top of drm-misc/drm-misc-net
> - Extract the typedef for pixel_read/pixel_write
> - Introduce the line-by-line algorithm per pixel format
> - Add some documentation for existing and new code
> - Port the series [1] to use line-by-line algorithm
> - Link to v1: https://lore.kernel.org/r/20240201-yuv-v1-0-3ca376f27632@bootlin.com
> ---
> Arthur Grillo (1):
> drm/vkms: Use drm_frame directly
>
> Louis Chauvet (8):
> drm/vkms: Code formatting
> drm/vkms: Add typedef and documentation for pixel_read and pixel_write functions
> drm/vkms: Use const for input pointers in pixel_read an pixel_write functions
> drm/vkms: Update pixels accessor to support packed and multi-plane formats.
> drm/vkms: Avoid computing blending limits inside pre_mul_alpha_blend
> drm/vkms: Introduce pixel_read_direction enum
> drm/vkms: Re-introduce line-per-line composition algorithm
> drm/vkms: Remove useless drm_rotation_simplify
>
> drivers/gpu/drm/vkms/vkms_composer.c | 312 ++++++++++++++++++++------
> drivers/gpu/drm/vkms/vkms_crtc.c | 6 +-
> drivers/gpu/drm/vkms/vkms_drv.c | 3 +-
> drivers/gpu/drm/vkms/vkms_drv.h | 55 ++++-
> drivers/gpu/drm/vkms/vkms_formats.c | 409 ++++++++++++++++++++++++----------
> drivers/gpu/drm/vkms/vkms_formats.h | 4 +-
> drivers/gpu/drm/vkms/vkms_plane.c | 17 +-
> drivers/gpu/drm/vkms/vkms_writeback.c | 5 -
> 8 files changed, 588 insertions(+), 223 deletions(-)
> ---
> base-commit: 623b1e4d2eace0958996995f9f88cb659a6f69dd
> change-id: 20240201-yuv-1337d90d9576
>
> Best regards,
>
On 18/11/24 - 18:10, José Expósito wrote:
> Hi Louis,
>
> > This patchset is the second version of [1]. It is almost a complete
> > rewrite to use a line-by-line algorithm for the composition.
> >
> > It can be divided in multiple parts:
> > - PATCH 1 to 3: no functional change is intended, only some formatting and
> > documenting (PATCH 2 is taken from [2])
> > - PATCH 4 to 7: Some preparation work not directly related to the
> > line-by-line algorithm
> > - PATCH 8: main patch for this series, it reintroduce the
> > line-by-line algorithm
> > - PATCH 9: Remove useless drm_simplify_rotation
> > - Rest of the series: moved to a new series to merge this one, see the new
> > series "Add YUV ad R1..8 formats support to VKMS"
> >
> > The PATCH 8 aims to restore the line-by-line pixel reading algorithm. It
> > was introduced in 8ba1648567e2 ("drm: vkms: Refactor the plane composer to
> > accept new formats") but removed in 8ba1648567e2 ("drm: vkms: Refactor the
> > plane composer to accept new formats") in a over-simplification effort.
> > At this time, nobody noticed the performance impact of this commit. After
> > the first iteration of my series, poeple notice performance impact, and it
> > was the case. Pekka suggested to reimplement the line-by-line algorithm.
> >
> > Expiriments on my side shown great improvement for the line-by-line
> > algorithm, and the performances are the same as the original line-by-line
> > algorithm. I targeted my effort to make the code working for all the
> > rotations and translations. The usage of helpers from drm_rect_* avoid
> > reimplementing existing logic.
> >
> > The only "complex" part remaining is the clipping of the coordinate to
> > avoid reading/writing outside of src/dst. Thus I added a lot of comments
> > to help when someone will want to add some features (framebuffer resizing
> > for example).
> >
> > I did not changed any expected test results as VKMS seems to have some
> > existing issue:
> > https://gitlab.freedesktop.org/jim.cromie/kernel-drm-next-dd/-/jobs/61484201
> > https://gitlab.freedesktop.org/jim.cromie/kernel-drm-next-dd/-/jobs/61803193
> > https://gitlab.freedesktop.org/louischauvet/kernel/-/jobs/65944002
> >
> > To properly test the rotation algorithm, I had to implement a new IGT
> > test [8]. This helped to found one issue in the YUV rotation algortihm.
> >
> > My series was mainly tested with:
> > - kms_plane (for color conversions)
> > - kms_rotation_crc (for a subset of rotation and formats)
> > - kms_rotation (to test all rotation and formats combinations) [8]
> > - kms_cursor_crc (for translations)
> > The benchmark used to measure the improvment was done with
> > kms_fb_stress [10] with some modifications:
> > - Fixing the writeback format to XRGB8888
> > - Using a primary plane with odd dimension to avoid failures due to YUV
> > alignment
> > The KMS structure was:
> > CRTC:
> > rectangle: 4096x2160+0+0
> > primary:
> > format: ABGR16161616
> > rectangle: 3640x2160+101+0
> > writeback:
> > format: XRGB8888
> > rectangle: 4096x2160+0+0
> > Results (on my computer):
> >
> > 8356b9790650: drm/test: Add test cases for drm_rect_rotate_inv() (before any regression)
> > 322d716a3e8a: drm/vkms: isolate pixel conversion functionality (first regression)
> > cc4fd2934d41: drm/vkms: Isolate writeback pixel conversion functions (second regression)
> > 2c3d1bd284c5: drm/panel: simple: Add Microtips Technology MF-103HIEB0GA0 panel (current drm-misc-next)
> >
> > Used format | This series | 2c3d1bd284c5 | cc4fd2934d41 | 322d716a3e8a | 8356b9790650 |
> > --------------+-------------+--------------+--------------+--------------+--------------+
> > XRGB8888 | 13.261666s | 14.289582s | 10.731272s | 9.480001s | 9.277507s |
> > XRGB16161616 | 13.282479s | 13.918926s | 10.712616s | 9.776903s | 9.291766s |
> > RGB565 | 136.154163s | 141.646489s | 101.744050s | 103.712164s | 87.860923s |
> >
> > This is a 5-10% improvment of the performance. More work need to be done
> > on the writeback to gain more.
> >
> > [1]: https://lore.kernel.org/all/20240201-yuv-v1-0-3ca376f27632@bootlin.com
> > [2]: https://lore.kernel.org/all/20240110-vkms-yuv-v2-0-952fcaa5a193@riseup.net/
> > [3]: https://lore.kernel.org/all/20240110-vkms-yuv-v2-3-952fcaa5a193@riseup.net/
> > [4]: https://lore.kernel.org/all/20240110-vkms-yuv-v2-5-952fcaa5a193@riseup.net/
> > [5]: https://lore.kernel.org/all/20240110-vkms-yuv-v2-6-952fcaa5a193@riseup.net/
> > [6]: https://lore.kernel.org/all/20240110-vkms-yuv-v2-7-952fcaa5a193@riseup.net/
> > [8]: https://lore.kernel.org/r/20240313-new_rotation-v2-0-6230fd5cae59@bootlin.com
> > [9]: https://lore.kernel.org/dri-devel/20240306-louis-vkms-conv-v1-1-5bfe7d129fdd@riseup.net/
> > [10]: https://lore.kernel.org/all/20240422-kms_fb_stress-dev-v5-0-0c577163dc88@riseup.net/
> >
> > To: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
> > To: Melissa Wen <melissa.srw@gmail.com>
> > To: Maíra Canal <mairacanal@riseup.net>
> > To: Haneen Mohammed <hamohammed.sa@gmail.com>
> > To: Daniel Vetter <daniel@ffwll.ch>
> > To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> > To: Maxime Ripard <mripard@kernel.org>
> > To: Thomas Zimmermann <tzimmermann@suse.de>
> > To: David Airlie <airlied@gmail.com>
> > To: rdunlap@infradead.org
> > To: arthurgrillo@riseup.net
> > To: Jonathan Corbet <corbet@lwn.net>
> > To: pekka.paalanen@haloniitty.fi
> > Cc: dri-devel@lists.freedesktop.org
> > Cc: linux-kernel@vger.kernel.org
> > Cc: jeremie.dautheribes@bootlin.com
> > Cc: miquel.raynal@bootlin.com
> > Cc: thomas.petazzoni@bootlin.com
> > Cc: seanpaul@google.com
> > Cc: marcheu@google.com
> > Cc: nicolejadeyee@google.com
> > Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
>
> Thanks for working on this. I reviewed the series and, with the exception of
> a couple of *very* minor comments, it looks good to me.
I already have to send a v14 so don't worry, I sent the v13 before
commiting on vkms...
> Feel free to add to the entire series:
> Reviewed-by: José Expósito <jose.exposito89@gmail.com>
Thanks a lot! I will add it.
> > Changes in v13:
> > - Removed the YUV part to prepare the merge
> > - Add Acked-by from Maíra
> > - Link to v12: https://lore.kernel.org/r/20241007-yuv-v12-0-01c1ada6fec8@bootlin.com
> > Changes in v12:
> > - Fix documentation issues as suggested by Randy
> > - Link to v11: https://lore.kernel.org/r/20240930-yuv-v11-0-4b1a26bcfc96@bootlin.com
> > Changes in v11:
> > - Remove documentation patch (already merged)
> > - Fix sparse warning about documentation
> > - Link to v10: https://lore.kernel.org/r/20240809-yuv-v10-0-1a7c764166f7@bootlin.com
> > Changes in v10:
> > - Properly remove the patch introducing dummy read/write functions
> > - PATCH 8/16: Format fixups
> > - PATCH 9/16: Format fixups
> > - PATCH 11/16: Format fixups
> > - PATCH 14/16: Fix test compilation, add module description
> > - Link to v9: https://lore.kernel.org/r/20240802-yuv-v9-0-08a706669e16@bootlin.com
> > Changes in v9:
> > - PATCH 3/17: Fix docs as Maíra suggested
> > - PATCH 4,6,10,12,15,17/17: Fix sparse warning about __le16 casting
> > - Link to v8: https://lore.kernel.org/all/20240516-yuv-v8-0-cf8d6f86430e@bootlin.com/
> > Changes in v8:
> > - PATCH 7/17: Update pitch access to use the proper value for block
> > formats
> > - PATCH 9/17: Update pitch access to use the proper value for block
> > formats
> > - Link to v7: https://lore.kernel.org/r/20240513-yuv-v7-0-380e9ffec502@bootlin.com
> > Changes in v7:
> > - Some typos and indent fixes
> > - Add Review-By, Acked-By
> > - PATCH 3/17: Clarify src/dst unit
> > - PATCH 9/17: Clarify documentation
> > - PATCH 9/17: Restrict conditions for direction
> > - PATCH 9/17: Rename get_block_step_byte to get_block_step_bytes
> > - PATCH 10/17: Clarify kernel doc for clamp_line_coordinates, blend_line,
> > pixel_read_line_t
> > - PATCH 10/17: Fix the case when src_*_start >= fb->width/height
> > - PATCH 10/17: Change y in blend to be an int
> > - PATCH 10/17: Clarify documentation for read functions
> > - PATCH 12/17: Fix the type of rgb variables in argb_u16_from_yuv888
> > - PATCH 12/17: Move comments at the right place, remove useless ones
> > - PATCH 12/17: Add missing const
> > - PATCH 17/17: Use drm_format_info_bpp and computation to avoid hard-coded
> > values
> > - Link to v6: https://lore.kernel.org/r/20240409-yuv-v6-0-de1c5728fd70@bootlin.com
> > Changes in v6:
> > - Add Randy
> > - Add Review-By and Acked-By
> > - PATCH 2/17: Remove useless newline
> > - PATCH 3/17: Fix kernel doc
> > - PATCH 4/17: Fix typo in git commit
> > - PATCH 4/17: Fix kernel doc and simplify brief description of typedef
> > - PATCH 5/17: Change black default color to Magenta
> > - PATCH 5/17: Fix wording in comment
> > - PATCH 7/17: Fix typo in packed_pixel_offset
> > - PATCH 7/17: Add WARN_ON for currently not supported formats
> > - PATCH 8/17: Rename x_limit to pixel_count
> > - PATCH 8/17: Clarify kernel doc for pre_mul_alpha_blend
> > - PATCH 9/17: Rename get_step_next_block to get_block_step_bytes
> > - PATCH 9/17: Change kernel doc order
> > - PATCH 9/17: Rework the direction_for_rotation function to use drm
> > helpers
> > - PATCH 9/17: Add a warn in direction_for_rotation if the result is not
> > expected
> > - PATCH 10/17: Reword the comment of pixel color conversion functions
> > - PATCH 10/17: Refactor the blending function to extract functions
> > - PATCH 11/17: Remove useless drm_rotation_simplify
> > - PATCH 12/17: Fix typo in comments
> > - PATCH 12/17: Remove useless define
> > - PATCH 12/17: Fix some comments typo and kernel doc
> > - PATCH 12/17: Add a comma at the end of the vkms_formats list
> > - PATCH 12/17: Use copy of matrix instead of pointers
> > - PATCH 12/17: Use 16 bit range for yuv conversion
> > - PATCH 17/17: Add a comma at the end of the vkms_formats list
> > - PATCH 17/17: Add assertions
> > - PATCH 17/17: Fix color conversion... Next time I will read the doc
> > twice...
> > - Link to v5: https://lore.kernel.org/r/20240313-yuv-v5-0-e610cbd03f52@bootlin.com
> > Changes in v5:
> > - All patches: fix some formatting issues
> > - PATCH 4/16: Use the correct formatter for 4cc code
> > - PATCH 7/16: Update the pixel accessors to also return the pixel position
> > inside a block.
> > - PATCH 8/16: Fix a temporary bug
> > - PATCH 9/16: Update the get_step_1x1 to get_step_next_block and update
> > the documentation
> > - PATCH 10/16: Update to uses the new pixel accessors
> > - PATCH 10/16: Reword some comments
> > - PATCH 11/16: Update to use the new pixel accessors
> > - PATCH 11/16: Fix a bug in the subsampling offset for inverted reading
> > (right to left/bottom to top). Found by [8].
> > - PATCH 11/16: Apply Arthur's modifications (comments, algorithm
> > clarification)
> > - PATCH 11/16: Use the correct formatter for 4cc code
> > - PATCH 11/16: Update to use the new get_step_next_block
> > - PATCH 14/16: Apply Arthur's modification (comments, compilation issue)
> > - PATCH 15/16: Add Arthur's patch to explain the kunit tests
> > - PATCH 16/16: Introduce DRM_FORMAT_R* support.
> > - Link to v4: https://lore.kernel.org/r/20240304-yuv-v4-0-76beac8e9793@bootlin.com
> > Changes in v4:
> > - PATCH 3/14: Update comments for get_pixel_* functions
> > - PATCH 4/14: Add WARN when trying to get unsupported pixel_* functions
> > - PATCH 5/14: Create dummy pixel reader/writer to avoid NULL
> > function pointers and kernel OOPS
> > - PATCH 6/14: Added the usage of const pointers when needed
> > - PATCH 7/14: Extraction of pixel accessors modification
> > - PATCH 8/14: Extraction of the blending function modification
> > - PATCH 9/14: Extraction of the pixel_read_direction enum
> > - PATCH 10/14: Update direction_for_rotation documentation
> > - PATCH 10/14: Rename conversion functions to be explicit
> > - PATCH 10/14: Replace while(count) by while(out_pixel<end) in read_line
> > callbacks. It avoid a new variable+addition in the composition hot path.
> > - PATCH 11/14: Rename conversion functions to be explicit
> > - PATCH 11/14: Update the documentation for get_subsampling_offset
> > - PATCH 11/14: Add the matrix_conversion structure to remove a test from
> > the hot path.
> > - PATCH 11/14: Upadate matrix values to use 32.32 fixed floats for
> > conversion
> > - PATCH 12/14: Update commit message
> > - PATCH 14/14: Change kunit expected value
> > - Link to v3: https://lore.kernel.org/r/20240226-yuv-v3-0-ff662f0994db@bootlin.com
> > Changes in v3:
> > - Correction of remaining git-rebase artefacts
> > - Added Pekka in copy of this patch
> > - Link to v2: https://lore.kernel.org/r/20240223-yuv-v2-0-aa6be2827bb7@bootlin.com
> > Changes in v2:
> > - Rebased the series on top of drm-misc/drm-misc-net
> > - Extract the typedef for pixel_read/pixel_write
> > - Introduce the line-by-line algorithm per pixel format
> > - Add some documentation for existing and new code
> > - Port the series [1] to use line-by-line algorithm
> > - Link to v1: https://lore.kernel.org/r/20240201-yuv-v1-0-3ca376f27632@bootlin.com
> > ---
> > Arthur Grillo (1):
> > drm/vkms: Use drm_frame directly
> >
> > Louis Chauvet (8):
> > drm/vkms: Code formatting
> > drm/vkms: Add typedef and documentation for pixel_read and pixel_write functions
> > drm/vkms: Use const for input pointers in pixel_read an pixel_write functions
> > drm/vkms: Update pixels accessor to support packed and multi-plane formats.
> > drm/vkms: Avoid computing blending limits inside pre_mul_alpha_blend
> > drm/vkms: Introduce pixel_read_direction enum
> > drm/vkms: Re-introduce line-per-line composition algorithm
> > drm/vkms: Remove useless drm_rotation_simplify
> >
> > drivers/gpu/drm/vkms/vkms_composer.c | 312 ++++++++++++++++++++------
> > drivers/gpu/drm/vkms/vkms_crtc.c | 6 +-
> > drivers/gpu/drm/vkms/vkms_drv.c | 3 +-
> > drivers/gpu/drm/vkms/vkms_drv.h | 55 ++++-
> > drivers/gpu/drm/vkms/vkms_formats.c | 409 ++++++++++++++++++++++++----------
> > drivers/gpu/drm/vkms/vkms_formats.h | 4 +-
> > drivers/gpu/drm/vkms/vkms_plane.c | 17 +-
> > drivers/gpu/drm/vkms/vkms_writeback.c | 5 -
> > 8 files changed, 588 insertions(+), 223 deletions(-)
> > ---
> > base-commit: 623b1e4d2eace0958996995f9f88cb659a6f69dd
> > change-id: 20240201-yuv-1337d90d9576
> >
> > Best regards,
> >
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