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SubjectRe: [PATCH 00/20] drm: Split out the formats API and move it to a common place
From
Date
Hi,

On Wed, 2019-04-17 at 09:54 +0200, Maxime Ripard wrote:
> Hi,
>
> DRM comes with an extensive format support to retrieve the various
> parameters associated with a given format (such as the subsampling, or the
> bits per pixel), as well as some helpers and utilities to ease the driver
> development.
>
> v4l2, on the other side, doesn't provide such facilities, leaving each
> driver reimplement a subset of the formats parameters for the one supported
> by that particular driver. This leads to a lot of duplication and
> boilerplate code in the v4l2 drivers.
>
> This series tries to address this by moving the DRM format API into lib and
> turning it into a more generic API. In order to do this, we've needed to do
> some preliminary changes on the DRM drivers, then moved the API and finally
> converted a v4l2 driver to give an example of how such library could be
> used.
>
> Let me know what you think,
> Maxime

Here is one general suggestion: calling the new library and functions
and formats "pixel format" instead of "image format" since this is the
most widely-used terminology (see the pixel format guide) and also the
one that (personally) feels most accurate.

What do you think?

Cheers,

Paul

> Changes from RFC:
> - Rebased on next
> - Fixed the various formats mapping
> - Added tags
> - Did most of the formats functions as inline functions
> - Used a consistent prefix for all the utilities functions
> - Fixed the compilation breakages, and did a run of allmodconfig for arm,
> arm64 and x86_64
> - Fixed out of array bounds warnings in the image_format_info_block_*
> functions
> - Added License and copyright headers on missing files
>
> Maxime Ripard (20):
> drm: Remove users of drm_format_num_planes
> drm: Remove users of drm_format_(horz|vert)_chroma_subsampling
> drm/fourcc: Pass the format_info pointer to drm_format_plane_cpp
> drm/fourcc: Pass the format_info pointer to drm_format_plane_width/height
> drm: Replace instances of drm_format_info by drm_get_format_info
> lib: Add video format information library
> drm/fb: Move from drm_format_info to image_format_info
> drm/malidp: Convert to generic image format library
> drm/client: Convert to generic image format library
> drm/exynos: Convert to generic image format library
> drm/i915: Convert to generic image format library
> drm/ipuv3: Convert to generic image format library
> drm/msm: Convert to generic image format library
> drm/omap: Convert to generic image format library
> drm/rockchip: Convert to generic image format library
> drm/tegra: Convert to generic image format library
> drm/fourcc: Remove old DRM format API
> lib: image-formats: Add v4l2 formats support
> lib: image-formats: Add more functions
> media: sun6i: Convert to the image format API
>
> drivers/gpu/drm/Kconfig | 2 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c | 4 +-
> drivers/gpu/drm/arm/malidp_drv.c | 3 +-
> drivers/gpu/drm/arm/malidp_hw.c | 3 +-
> drivers/gpu/drm/arm/malidp_mw.c | 2 +-
> drivers/gpu/drm/arm/malidp_planes.c | 20 +-
> drivers/gpu/drm/armada/armada_fb.c | 3 +-
> drivers/gpu/drm/armada/armada_overlay.c | 2 +-
> drivers/gpu/drm/armada/armada_plane.c | 2 +-
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 11 +-
> drivers/gpu/drm/bochs/bochs.h | 4 +-
> drivers/gpu/drm/bochs/bochs_hw.c | 2 +-
> drivers/gpu/drm/drm_client.c | 7 +-
> drivers/gpu/drm/drm_fb_cma_helper.c | 4 +-
> drivers/gpu/drm/drm_fb_helper.c | 14 +-
> drivers/gpu/drm/drm_format_helper.c | 4 +-
> drivers/gpu/drm/drm_fourcc.c | 345 +-----
> drivers/gpu/drm/drm_framebuffer.c | 10 +-
> drivers/gpu/drm/drm_gem_framebuffer_helper.c | 4 +-
> drivers/gpu/drm/exynos/exynos_drm_fb.c | 2 +-
> drivers/gpu/drm/exynos/exynos_drm_ipp.c | 2 +-
> drivers/gpu/drm/exynos/exynos_drm_ipp.h | 4 +-
> drivers/gpu/drm/exynos/exynos_drm_scaler.c | 3 +-
> drivers/gpu/drm/gma500/framebuffer.c | 4 +-
> drivers/gpu/drm/i915/i915_drv.h | 6 +-
> drivers/gpu/drm/i915/intel_display.c | 14 +-
> drivers/gpu/drm/i915/intel_pm.c | 6 +-
> drivers/gpu/drm/i915/intel_sprite.c | 3 +-
> drivers/gpu/drm/imx/ipuv3-plane.c | 19 +-
> drivers/gpu/drm/mediatek/mtk_drm_fb.c | 8 +-
> drivers/gpu/drm/meson/meson_overlay.c | 14 +-
> drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c | 11 +-
> drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 10 +-
> drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 4 +-
> drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c | 25 +-
> drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c | 8 +-
> drivers/gpu/drm/msm/msm_fb.c | 18 +-
> drivers/gpu/drm/omapdrm/dss/dispc.c | 9 +-
> drivers/gpu/drm/omapdrm/omap_fb.c | 15 +-
> drivers/gpu/drm/radeon/radeon_fb.c | 4 +-
> drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 17 +-
> drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 14 +-
> drivers/gpu/drm/selftests/Makefile | 3 +-
> drivers/gpu/drm/selftests/drm_modeset_selftests.h | 3 +-
> drivers/gpu/drm/selftests/test-drm_format.c | 280 +----
> drivers/gpu/drm/selftests/test-drm_modeset_common.h | 3 +-
> drivers/gpu/drm/stm/ltdc.c | 2 +-
> drivers/gpu/drm/sun4i/sun4i_backend.c | 6 +-
> drivers/gpu/drm/sun4i/sun4i_frontend.c | 18 +-
> drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 4 +-
> drivers/gpu/drm/sun4i/sun8i_vi_scaler.c | 6 +-
> drivers/gpu/drm/sun4i/sun8i_vi_scaler.h | 5 +-
> drivers/gpu/drm/tegra/fb.c | 14 +-
> drivers/gpu/drm/tegra/plane.c | 4 +-
> drivers/gpu/drm/vc4/vc4_plane.c | 15 +-
> drivers/gpu/drm/zte/zx_plane.c | 6 +-
> drivers/gpu/ipu-v3/ipu-pre.c | 3 +-
> drivers/gpu/ipu-v3/ipu-prg.c | 3 +-
> drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 89 +-
> drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h | 49 +-
> drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_reg.h | 6 +-
> drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c | 11 +-
> include/drm/drm_fourcc.h | 219 +---
> include/drm/drm_framebuffer.h | 4 +-
> include/drm/drm_mode_config.h | 5 +-
> include/linux/image-formats.h | 438 ++++++-
> lib/Kconfig | 7 +-
> lib/Makefile | 3 +-
> lib/image-formats-selftests.c | 325 +++++-
> lib/image-formats.c | 717 ++++++++++-
> 70 files changed, 1740 insertions(+), 1174 deletions(-)
> delete mode 100644 drivers/gpu/drm/selftests/test-drm_format.c
> create mode 100644 include/linux/image-formats.h
> create mode 100644 lib/image-formats-selftests.c
> create mode 100644 lib/image-formats.c
>
> base-commit: de3c659c83ce88d495f2a36397071fdd0a337345
--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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