Message-ID: <20200905114949.GA111526@bogon.m.sigxcpu.org>
Date:   Sat, 5 Sep 2020 13:49:49 +0200
From:   Guido Günther <agx@...xcpu.org>
To:     Laurentiu Palcu <laurentiu.palcu@....nxp.com>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        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
Subject: Re: [PATCH v9 0/5] Add support for iMX8MQ Display Controller
 Subsystem

Hi Laurentiu,
On Fri, Jul 31, 2020 at 10:54:29AM +0200, Guido Günther wrote:
> Hi,
> 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... :/
> 
> I don't think this should hold up merging.

And i retested your v9 series on next-20200903 on a librem5 devkit and
it works. Looking back I spotted an error in my clock configuration, so

Tested-by: Guido Günther <agx@...xcpu.org>

Cheers,
 -- Guido

> Cheers,
>  -- Guido
> 
> > 
> > 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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