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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 fixes invisible plane issue reported by Sashiko AI bot in v6. Patch 4 fixes FetchUnit dimensions as related to prefetch engine function. Patch 5 flags CRTC status in GERNERALPURPOSE register as needed by patch 6. Patch 6 disables CRTC at boot if needed to support prefetch engine better. Patch 7 and 8 add PRG and DPRC drivers. Patch 9 to 14 do preparations before using prefetch engine in imx8-dc KMS driver. Patch 15 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 --- Changes in v7: - Collect Maxime's A-b tags. - Fix Sashiko AI bot's comments. See detail changelog in each patch. - Trivial tweaks. - Cc Alexander. - Link to v6: https://patch.msgid.link/20260904-imx8-dc-prefetch-v6-0-26643e3f6cb7@nxp.com Changes in v6: - Rebase onto the latest drm-misc-next and resolve conflicts in patch 4&7&13. - Include "dc-drv.h" in patch 5&6 to avoid build warnings with C=1. - Fix PRG BYPASS programming in patch 5. - Link to v5: https://lore.kernel.org/r/20251027-imx8-dc-prefetch-v5-0-4ecb6c6d4941@nxp.com Changes in v5: - Squash MAINTAINERS file update into patch 1&2. (Krzysztof) - Link to v4: https://lore.kernel.org/r/20251016-imx8-dc-prefetch-v4-0-dfda347cb3c5@nxp.com Changes in v4: - Rebase onto the latest drm-misc-next and resolve conflicts in patch 4&10. - Sort bits and bitfields in descending order for register PRG_CTRL in patch 6. - Cc Marek as stakeholder of the driver due to recent i.MX95 DC patches posted. - Link to v3: https://lore.kernel.org/r/20250929-imx8-dc-prefetch-v3-0-c01d0608add2@nxp.com Changes in v3: - Call dc_dprc_enable() only when start == true in patch 7. (Frank) - Collect Frank's R-b tags. - Link to v2: https://lore.kernel.org/r/20250923-imx8-dc-prefetch-v2-0-5d69dc9ac8b5@nxp.com Changes in v2: - Rebase the patch series onto next-20250922. - Collect Alexander's and Frank's R-b tags. - Manage PRG's and DPRC's clocks with bulk interfaces in patch 6&7. (Frank) - Sort variables in probe function in reverse Christmas tree fashion in patch 7. (Frank) - Link to v1: https://lore.kernel.org/r/20250704-imx8-dc-prefetch-v1-0-784c03fd645f@nxp.com --- Liu Ying (15): dt-bindings: display: imx: Add i.MX8qxp/qm PRG binding dt-bindings: display: imx: Add i.MX8qxp/qm DPR channel binding drm/imx: dc-plane: Disable plane when it is invisible drm/imx: dc-fu: Fix dimensions drm/imx: dc: Flag CRTC status in GERNERALPURPOSE register 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 | 214 ++++++++- drivers/gpu/drm/imx/dc/dc-de.h | 2 + drivers/gpu/drm/imx/dc/dc-dprc.c | 522 +++++++++++++++++++++ drivers/gpu/drm/imx/dc/dc-dprc.h | 37 ++ drivers/gpu/drm/imx/dc/dc-drv.c | 83 ++++ drivers/gpu/drm/imx/dc/dc-drv.h | 12 + drivers/gpu/drm/imx/dc/dc-ed.c | 35 +- drivers/gpu/drm/imx/dc/dc-fg.c | 11 +- drivers/gpu/drm/imx/dc/dc-fl.c | 7 +- drivers/gpu/drm/imx/dc/dc-fu.c | 59 ++- 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 | 27 +- drivers/gpu/drm/imx/dc/dc-pe.h | 2 + drivers/gpu/drm/imx/dc/dc-plane.c | 100 ++-- drivers/gpu/drm/imx/dc/dc-prg.c | 326 +++++++++++++ drivers/gpu/drm/imx/dc/dc-prg.h | 39 ++ drivers/gpu/drm/imx/dc/dc-tc.c | 119 ++++- 24 files changed, 1726 insertions(+), 63 deletions(-) --- base-commit: cf61bef3801c3c9d0d8c39026b7b2fb242898a3a change-id: 20250703-imx8-dc-prefetch-028e306591c6 Best regards, -- Regards, Liu Ying