Re: [PATCH 00/14] drm/imx: dc: Use prefetch engine

[Liu Ying <victor.liu@nxp.com>]

On 07/04/2025, Liu Ying wrote:
> Hi,
> 
> This patch series aims to use prefetch engine in imx8-dc KMS driver.
> 
> One prefetch engine consists of one DPR Channel(DPRC) and one or two
> Display Prefetch Resolve Gaskets(PRGs).  It prefetches data from
> DDR, resolves data in tile formats if needed and outputs the result
> data to FetchUnit(s).  When one PRG is used, a prefetch engine supports
> processing pixel formats with one planar, e.g., RGB formats.  When two
> are used, pixel formats with two planars are supported, e.g., NV12.
> 
> For now, this patch series only supports prefetch engines with one PRG
> because it is enough for XRGB8888 which is the only pixel format
> supported by imx8-dc plane driver.  Two PRGs would be supported by
> future patches.
> 
> Patch 1 and 2 add dt-bindings for DPRC and PRG.  They were reviewed
> by Rob[1][2].  I slightly modified the patches' commit message to use
> imperative mood.
> 
> Patch 3 adds DPRC and PRG dt-binding files to MAINTAINERS.
> 
> Patch 4 fixes FetchUnit dimensions as related to prefetch engine function.
> 
> Patch 5 disables CRTC at boot if needed to support prefetch engine better.
> 
> Patch 6 and 7 add PRG and DPRC drivers.
> 
> Patch 8 to 13 do preparations before using prefetch engine in imx8-dc KMS
> driver.
> 
> Patch 14 uses prefetch engine in imx8-dc KMS driver.
> 
> [1] https://lore.kernel.org/lkml/20201207165945.GA430214@robh.at.kernel.org/
> [2] https://lore.kernel.org/lkml/20201207170206.GA434964@robh.at.kernel.org/
> 
> Signed-off-by: Liu Ying <victor.liu@nxp.com>
> ---
> Liu Ying (14):
>       dt-bindings: display: imx: Add i.MX8qxp/qm PRG binding
>       dt-bindings: display: imx: Add i.MX8qxp/qm DPR channel binding
>       MAINTAINERS: Add i.MX8qxp prefetch engine DT binding files
>       drm/imx: dc-fu: Fix dimensions
>       drm/imx: dc-crtc: Disable at boot
>       drm/imx: dc: Add PRG support
>       drm/imx: dc: Add DPR channel support
>       drm/imx: dc: Use TCON operation mode
>       drm/imx: dc-ed: Support getting source selection
>       drm/imx: dc-lb: Support getting secondary input selection
>       drm/imx: dc-ed: Drop initial source selection
>       drm/imx: dc-lb: Drop initial primary and secondary input selections
>       drm/imx: dc-fu: Get DPR channel
>       drm/imx: dc: Use prefetch engine
> 
>  .../bindings/display/imx/fsl,imx8qxp-dprc.yaml     | 100 +++++
>  .../bindings/display/imx/fsl,imx8qxp-prg.yaml      |  60 +++
>  MAINTAINERS                                        |   2 +
>  drivers/gpu/drm/imx/dc/Kconfig                     |   1 +
>  drivers/gpu/drm/imx/dc/Makefile                    |   6 +-
>  drivers/gpu/drm/imx/dc/dc-crtc.c                   | 191 +++++++-
>  drivers/gpu/drm/imx/dc/dc-de.h                     |   2 +
>  drivers/gpu/drm/imx/dc/dc-dprc.c                   | 499 +++++++++++++++++++++
>  drivers/gpu/drm/imx/dc/dc-dprc.h                   |  35 ++
>  drivers/gpu/drm/imx/dc/dc-drv.c                    |   7 +
>  drivers/gpu/drm/imx/dc/dc-drv.h                    |   5 +
>  drivers/gpu/drm/imx/dc/dc-ed.c                     |  27 +-
>  drivers/gpu/drm/imx/dc/dc-fl.c                     |   7 +-
>  drivers/gpu/drm/imx/dc/dc-fu.c                     |  49 +-
>  drivers/gpu/drm/imx/dc/dc-fu.h                     |  11 +-
>  drivers/gpu/drm/imx/dc/dc-fw.c                     |   7 +-
>  drivers/gpu/drm/imx/dc/dc-kms.h                    |   7 +
>  drivers/gpu/drm/imx/dc/dc-lb.c                     |  23 +-
>  drivers/gpu/drm/imx/dc/dc-pe.h                     |   2 +
>  drivers/gpu/drm/imx/dc/dc-plane.c                  |  46 +-
>  drivers/gpu/drm/imx/dc/dc-prg.c                    | 335 ++++++++++++++
>  drivers/gpu/drm/imx/dc/dc-prg.h                    |  39 ++
>  drivers/gpu/drm/imx/dc/dc-tc.c                     | 114 ++++-
>  23 files changed, 1545 insertions(+), 30 deletions(-)
> ---
> base-commit: 50c8770a42faf8b1c7abe93e7c114337f580a97d
> change-id: 20250703-imx8-dc-prefetch-028e306591c6
> 
> Best regards,

Gentle ping.

-- 
Regards,
Liu Ying