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SubjectRe: [PATCH v5 0/4] Add support for iMX8MQ Display Controller Subsystem
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Hi Laurentiu,

Am Donnerstag, den 09.07.2020, 19:47 +0300 schrieb Laurentiu Palcu:
> From: Laurentiu Palcu <laurentiu.palcu@nxp.com>
>
> Hi,
>
> This patchset adds initial DCSS support for iMX8MQ chip. Initial support
> includes only graphics plane support (no video planes), no HDR10 capabilities,
> no graphics decompression (only linear, tiled and super-tiled buffers allowed).
>
> Support for the rest of the features will be added incrementally, in subsequent
> patches.
>
> The patchset was tested with both HDP driver (in the downstream tree) and the upstream
> MIPI-DSI driver (with a couple of patches on top, to make it work correctly with DCSS).

I think the series (minus 3/5 and minor correction to the DT binding)
is fine to go in now. So just some formal questions: are you going to
maintain this driver in upstream? If so we should add a MAINTAINERS
entry to that effect. I can offer to act as a reviewer in this case.

How do you intend to merge this? IMO pushing this through drm-misc
seems like the right thing to do. If you agree I can help you get this
applied. If you are going to maintain the driver on your own, I think
you should then apply for commit rights to drm-misc.

Regards,
Lucas

> Thanks,
> Laurentiu
>
> Changes in v5:
> * Rebased to latest;
> * Took out component framework support and made it a separate patch so
> that people can still test with HDP driver, which makes use of it.
> But the idea is to get rid of it once HDP driver's next versions
> will remove component framework as well;
> * Slight improvement to modesetting: avoid cutting off the pixel clock
> if the new mode and the old one are equal. Also, in this case, is
> not necessary to wait for DTG to shut off. This would allow to switch
> from 8b RGB to 12b YUV422, for example, with no interruptions (at least
> from DCSS point of view);
> * Do not fire off CTXLD when going to suspend, unless it still has
> entries that need to be committed to DCSS;
> * Addressed Rob's comments on bindings;
>
> Changes in v4:
> * Addressed Lucas and Philipp's comments:
> * Added DRM_KMS_CMA_HELPER dependency in Kconfig;
> * Removed usage of devm_ functions since I'm already doing all the
> clean-up in the submodules_deinit();
> * Moved the drm_crtc_arm_vblank_event() in dcss_crtc_atomic_flush();
> * Removed en_completion variable from dcss_crtc since this was
> introduced mainly to avoid vblank timeout warnings which were fixed
> by arming the vblank event in flush() instead of begin();
> * Removed clks_on and irq_enabled flags since all the calls to
> enabling/disabling clocks and interrupts were balanced;
> * Removed the custom atomic_commit callback and used the DRM core
> helper and, in the process, got rid of a workqueue that wasn't
> necessary anymore;
> * Fixed some minor DT binding issues flagged by Philipp;
> * Some other minor changes suggested by Lucas;
> * Removed YUV formats from the supported formats as these cannot work
> without the HDR10 module CSCs and LUTs. Will add them back when I
> will add support for video planes;
>
> Changes in v3:
> * rebased to latest linux-next and made it compile as drmP.h was
> removed;
> * removed the patch adding the VIDEO2_PLL clock. It's already applied;
> * removed an unnecessary 50ms sleep in the dcss_dtg_sync_set();
> * fixed a a spurious hang reported by Lukas Hartmann and encountered
> by me several times;
> * mask DPR and DTG interrupts by default, as they may come enabled from
> U-boot;
>
> Changes in v2:
> * Removed '0x' in node's unit-address both in DT and yaml;
> * Made the address region size lowercase, to be consistent;
> * Removed some left-over references to P010;
> * Added a Kconfig dependency of DRM && ARCH_MXC. This will also silence compilation
> issues reported by kbuild for other architectures;
>
> Laurentiu Palcu (5):
> drm/imx: compile imx directory by default
> drm/imx: Add initial support for DCSS on iMX8MQ
> drm/imx/dcss: add component framework functionality
> dt-bindings: display: imx: add bindings for DCSS
> arm64: dts: imx8mq: add DCSS node
>
> .../bindings/display/imx/nxp,imx8mq-dcss.yaml | 84 ++
> arch/arm64/boot/dts/freescale/imx8mq.dtsi | 23 +
> drivers/gpu/drm/Makefile | 2 +-
> drivers/gpu/drm/imx/Kconfig | 2 +
> drivers/gpu/drm/imx/Makefile | 1 +
> drivers/gpu/drm/imx/dcss/Kconfig | 9 +
> drivers/gpu/drm/imx/dcss/Makefile | 6 +
> drivers/gpu/drm/imx/dcss/dcss-blkctl.c | 70 ++
> drivers/gpu/drm/imx/dcss/dcss-crtc.c | 219 +++++
> drivers/gpu/drm/imx/dcss/dcss-ctxld.c | 424 +++++++++
> drivers/gpu/drm/imx/dcss/dcss-dev.c | 314 +++++++
> drivers/gpu/drm/imx/dcss/dcss-dev.h | 177 ++++
> drivers/gpu/drm/imx/dcss/dcss-dpr.c | 562 ++++++++++++
> drivers/gpu/drm/imx/dcss/dcss-drv.c | 183 ++++
> drivers/gpu/drm/imx/dcss/dcss-dtg.c | 409 +++++++++
> drivers/gpu/drm/imx/dcss/dcss-kms.c | 185 ++++
> drivers/gpu/drm/imx/dcss/dcss-kms.h | 43 +
> drivers/gpu/drm/imx/dcss/dcss-plane.c | 405 +++++++++
> drivers/gpu/drm/imx/dcss/dcss-scaler.c | 826 ++++++++++++++++++
> drivers/gpu/drm/imx/dcss/dcss-ss.c | 180 ++++
> 20 files changed, 4123 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/devicetree/bindings/display/imx/nxp,imx8mq-dcss.yaml
> create mode 100644 drivers/gpu/drm/imx/dcss/Kconfig
> create mode 100644 drivers/gpu/drm/imx/dcss/Makefile
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-blkctl.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-crtc.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-ctxld.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dev.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dev.h
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dpr.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-drv.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-dtg.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-kms.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-kms.h
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-plane.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-scaler.c
> create mode 100644 drivers/gpu/drm/imx/dcss/dcss-ss.c
>

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