Date:   Thu, 30 Jul 2020 11:13:36 +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, Robert Chiras <robert.chiras@....com>
Subject: Re: [PATCH v8 0/5] Add support for iMX8MQ Display Controller
 Subsystem

Hi Laurentiu,
On Thu, Jul 30, 2020 at 12:10:55PM +0300, Laurentiu Palcu wrote:
> Hi Guido,
> 
> On Wed, Jul 29, 2020 at 05:09:52PM +0200, Guido Günther wrote:
> > Hi,
> > On Wed, Jul 29, 2020 at 05:16:47PM +0300, Laurentiu Palcu wrote:
> > > Hi Guido,
> > > 
> > > On Wed, Jul 29, 2020 at 03:59:48PM +0200, Guido Günther wrote:
> > > > Hi,
> > > > On Fri, Jul 24, 2020 at 12:07:29PM +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).
> > > > 
> > > > While i could run earlier versions of this  series with NWL I'm seeing
> > > > only a brief image that then turns black (backlight still on) with this current version and
> > > > the board hangs soon after.(for reference using mxsfb works nicely with
> > > > the very same DT on next-20200727). If I do a drm.debug=0x3f i can see
> > > > that display output stops around:
> > > > 
> > > > [   15.394473] imx-dcss 32e00000.display-controller: [drm:drm_update_vblank_count] updating vblank count on crtc 0: current=22, diff=1, hw=0 hw_last=0
> > > > [   15.397575] device: 'input1': device_add
> > > > [   15.444658] imx-dcss 32e00000.display-controller: [drm:drm_update_vblank_count] updating vblank count on crtc 0: current=23, diff=1, hw=0 hw_last=0
> > > > [   15.465946] PM: Adding info for No Bus:input1
> > > > [   15.494842] imx-dcss 32e00000.display-controller: [drm:drm_update_vblank_count] updating vblank count on crtc 0: current=24, diff=1, hw=0 hw_last=0
> > > > [   15.511694] input: gpio-keys as /devices/platform/gpio-keys/input/input1
> > > > [   15.545025] imx-dcss 32e00000.display-controller: [drm:drm_update_vblank_count] updating vblank count on crtc 0: current=25, diff=1, hw=0 hw_last=0
> > > > [   15.557869] device: 'event1': device_add
> > > > [   15.595209] imx-dcss 32e00000.display-controller: [drm:drm_update_vblank_count] updating vblank count on crtc 0: current=26, diff=1, hw=0 hw_last=0
> > > > [   15.605363] PM: Adding info for No Bus:event1
> > > > [   15.645394] imx-dcss 32e00000.display-controller: [drm:drm_update_vblank_count] updating vblank count on crtc 0: current=27, diff=1, hw=0 hw_last=0
> > > > [   19.427039] imx-dcss 32e00000.display-controller: [drm:vblank_disable_fn] disabling vblank on crtc 0
> > > > [   19.436135] device: 'wakeup6': device_add
> > > > [   19.448202] imx-dcss 32e00000.display-controller: [drm:drm_update_vblank_count] updating vblank count on crtc 0: current=28, diff=0, hw=0 hw_last=0
> > > > 
> > > > (and there's no further logging from drm from there on).
> > > > 
> > > > Would any the above mentioned patches do anything in that area?
> > > 
> > > The NWL driver is missing at least one fix that is needed for DCSS to
> > > work nicely with it. One thing that needs fixed is the polarity. I added
> > > a patch for that in our tree... :/
> > > 
> > > Currently, in NWL upstream, we have
> > > 
> > > adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> > > adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> > > 
> > > However DCSS works with:
> > > 
> > > adjusted->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> > > adjusted->flags |= (DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> > 
> > Thanks! I remember not getting any output at all with DCSS without what
> > you suggest above but now i get some output and then a hang so there
> > seems to be something else off.
> 
> What's the hang about? Any backtrace?

I'm not near the board atm but there wasn't anything in the logs (even
with 'drm.debug=0x3f debug' turned. It's about the time when the virtual
console would get spawned but i haven't checked more closely yet.
Cheers,
 -- Guido

> 
> Thanks,
> laurentiu
> 
> > 
> > Cheers,
> >  -- Guido
> > 
> > > 
> > > I CCed Robert. He'll work on upstreaming these NWL changes in the following
> > > period of time.
> > > 
> > > Thanks,
> > > laurentiu
> > > 
> > > > 
> > > > Cheers,
> > > >  -- Guido
> > > > 
> > > > > 
> > > > > Thanks,
> > > > > Laurentiu
> > > > > 
> > > > > 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 | 104 +++
> > > > >  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              |   8 +
> > > > >  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, 4107 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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