Message-ID: <20200831112445.t4xfz33avdyx5w6p@fsr-ub1864-141>
Date:   Mon, 31 Aug 2020 14:24:45 +0300
From:   Laurentiu Palcu <laurentiu.palcu@....nxp.com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        Sam Ravnborg <sam@...nborg.org>
Cc:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Laurentiu Palcu <laurentiu.palcu@....com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        lukas@...mn.com, agx@...xcpu.org
Subject: Re: [PATCH v9 0/5] Add support for iMX8MQ Display Controller
 Subsystem

Hi Lucas, Sam,

On Mon, Aug 31, 2020 at 12:37:23PM +0200, Lucas Stach wrote:
> Hi Laurentiu,
> 
> On Fr, 2020-08-28 at 11:36 +0300, Laurentiu Palcu wrote:
> > Hi Lucas,
> > 
> > I was wondering about the plans to merge this series. Since not many
> > people can test it properly due to lack of DCSS support in the upstream
> > NWL driver (which I heard it's coming soon) and a completely nonexistent
> > HDP driver, are we going to take a leap of faith and merge it as is? Or
> > should we wait?
> 
> I think even if the bridges aren't ready yet, the driver is in a good
> enough shape to merge it. There's no point in letting it accumulate
> bitrot while waiting for the bridges to land. Also I guess it will make
> bridge driver development a lot easier when the DCSS driver is in-tree.

OK, fair enough.

> 
> > As to who is going to do the actual merge, I know we had a brief
> > discussion about it some time ago and I was supposed to apply for
> > drm-misc rights, however it feels a little awkward to merge my own
> > code... :) Though, I might not even qualify for drm-misc rights anyway,
> > considering I haven't been very active in this area... :/
> 
> Please consider applying for drm-misc merge rights. Even if you don't
> do the initial merge I think it will come in handy in the long run.

OK, I'll apply for drm-misc rights. Sam also encouraged me to do this in
a previous email. Since this series will be followed by a bunch of other
patches, enabling support for video planes, among other things, I guess
I'll need the rights anyway.

> 
> > On that note, I will probably need help with the merging, provided it's
> > still happenning. Will you be able to help me out with this?
> 
> Sure, I'm having some time available this week. I'll give this v9
> another spin on my boards and will do the merge after that.

Thanks Lucas. As a matter of fact, after Sam's email, I was preparing a
v10 after rebasing to latest drm-next. However, no conflicts were encountered
and the v9 series applied cleanly. Let me know if you encounter any
issues and I can resend it.

Thanks,
Laurentiu

> 
> Regards,
> Lucas
> 
> > Thanks,
> > laurentiu
> > 
> > On Fri, Jul 31, 2020 at 11:18:28AM +0300, Laurentiu Palcu wrote:
> > > From: Laurentiu Palcu <laurentiu.palcu@....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).
> > > 
> > > Thanks,
> > > Laurentiu
> > > 
> > > Changes in v9:
> > >  * Fixed a compilation issue found by Guido in his setup: 'select
> > >    VIDEOMODE_HELPERS' was missing from Kconfig;
> > >  * Use imx8mq-clock.h in the bindings file so one can understand what
> > >    those clock values mean;
> > >  * no other changes done. Couldn't address the hang Guido reported as
> > >    it's not happening in my setup. However, in my tree, there are some
> > >    extra NWL and ADV patches applied on top of upstream ones... Also,
> > >    removing them and testing only with upstream, even if there's no
> > >    image out, does not produce a hang... :/
> > > 
> > > Changes in v8:
> > >  * Removed 'select RESET_CONTROLLER" from Kconfig as Philipp pointed
> > >    out. SRC is not used in DCSS driver;
> > >  * Nothing else changed;
> > > 
> > > Changes in v7:
> > >  * Added a patch to initialize the connector using the drm_bridge_connector
> > >    API as Sam suggested. Tested it using NWL_DSI and ADV7535 with
> > >    Guido's patch [1] applied and one fix for ADV [2]. Also, some extra
> > >    patches for ADV and NWL were needed, from our downstream tree, which
> > >    will be upstreamed soon by their author;
> > >  * Rest of the patches are untouched;
> > > 
> > > [1] https://lists.freedesktop.org/archives/dri-devel/2020-July/273025.html
> > > [2] https://lists.freedesktop.org/archives/dri-devel/2020-July/273132.html
> > > 
> > > Changes in v6:
> > >  * Addressed Rob's comment and added "additionalProperties: false" at
> > >    the end of the bindings' properties. However, this change surfaced
> > >    an issue with the assigned-clock* properties not being documented in
> > >    the properties section. Added the descriptions and the bindings patch
> > >    will need another review;
> > >  * Added an entry for DCSS driver in the MAINTAINERS file;
> > >  * Removed the component framework patch altogether;
> > > 
> > > 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: use drm_bridge_connector API
> > >   MAINTAINERS: Add entry for i.MX 8MQ DCSS driver
> > >   dt-bindings: display: imx: add bindings for DCSS
> > > 
> > >  .../bindings/display/imx/nxp,imx8mq-dcss.yaml | 108 +++
> > >  MAINTAINERS                                   |   8 +
> > >  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           | 325 +++++++
> > >  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           | 138 +++
> > >  drivers/gpu/drm/imx/dcss/dcss-dtg.c           | 409 +++++++++
> > >  drivers/gpu/drm/imx/dcss/dcss-kms.c           | 198 +++++
> > >  drivers/gpu/drm/imx/dcss/dcss-kms.h           |  44 +
> > >  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, 4112 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
> > > 
> > > -- 
> > > 2.23.0
> > > 
> 

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