On Fri, Jul 17, 2020 at 11:12:39AM +0200, Lucas Stach wrote:

Am Freitag, den 17.07.2020, 10:59 +0200 schrieb Daniel Vetter:

quoted

On Fri, Jul 17, 2020 at 10:18 AM Lucas Stach [off-list ref] wrote:

quoted

Hi Laurentiu,

Am Donnerstag, den 09.07.2020, 19:47 +0300 schrieb Laurentiu Palcu:

quoted

From: Laurentiu Palcu <redacted>

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.

drm/imx isn't listed yet as under the drm-misc umbrella, maybe we
should put the entire collective of imx drivers under drm-misc? Or
maybe it's just an oversight that the git repo isn't specified in the
MAINTAINERS entry. Also maybe we should add the pengutronix kernel
team alias there too?

drm/imx was exclusively the IPUv3 up until now, which is in fact
maintained outside of drm-misc in its own git tree. This has worked
quite well in the past so even though IPUv3 doesn't see a lot of churn
these days the motivation to change anything to this workflow is quite
low. And yes, the git tree is missing from the MAINTAINERS entry.

For the DCSS driver, if it's going to be maintained by NXP, I figured
it might be easier for Laurentiu to push things into drm-misc than set
up a separate public git tree. But IMHO that's fully up to him to
decide.

/me puts on maintainer hat

Much prefer drm-misc over random people playing maintainer and fumbling
it. I think the reasonable options are either in the current imx tree, or
drm-misc. Standalone tree for these small drivers just doesn't make much
sense.
-Daniel

Regards,
Lucas

quoted

-Daniel

quoted

Regards,
Lucas

quoted

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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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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