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SubjectRe: [PATCH v8 0/5] Add support for iMX8MQ Display Controller Subsystem
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@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).
> > >
> > > 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?

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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