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

Liu Ying
2025-07-04T11:52:41Z

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,
--
Liu Ying <victor.liu@nxp.com>