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Subject: Re: [PATCH v6 00/14] Add some DRM bridge drivers support for
 i.MX8qm/qxp SoCs
From:   Liu Ying <victor.liu@nxp.com>
To:     Marcel Ziswiler <marcel.ziswiler@toradex.com>,
        "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>,
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Date:   Tue, 23 Mar 2021 17:09:59 +0800
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On Tue, 2021-03-23 at 01:03 +0000, Marcel Ziswiler wrote:
> Hi Liu
> 
> Some further discrepancy with them binding examples:
> 
> arch/arm64/boot/dts/freescale/imx8qxp.dtsi:335.9-36: Warning (reg_format): /dpu@56180000:reg: property has
> invalid length (8 bytes) (#address-cells == 2, #size-cells == 2)
> arch/arm64/boot/dts/freescale/imx8qxp.dtsi:508.9-35: Warning (reg_format): /syscon@56221000:reg: property has
> invalid length (8 bytes) (#address-cells == 2, #size-cells == 2)
> arch/arm64/boot/dts/freescale/imx8qxp.dtsi:601.9-34: Warning (reg_format): /phy@56228300:reg: property has
> invalid length (8 bytes) (#address-cells == 2, #size-cells == 2)
> arch/arm64/boot/dts/freescale/imx8qxp.dtsi:613.9-36: Warning (reg_format): /pixel-combiner@56020000:reg:
> property has invalid length (8 bytes) (#address-cells == 2, #size-cells == 2)
> 
> And with that I am unable to bring it up:
> 
> [    1.714498] imx8qxp-ldb 5622100000001000.syscon:ldb: [drm:ldb_init_helper] *ERROR* failed to get regmap: -12
> [    1.724441] imx8qxp-ldb: probe of 5622100000001000.syscon:ldb failed with error -12
> [    1.734983] imx8qxp-pixel-combiner 5602000000010000.pixel-combiner: invalid resource
> [    1.742830] imx8qxp-pixel-combiner: probe of 5602000000010000.pixel-combiner failed with error -22
> [    1.754040] imx8qxp-display-pixel-link dc0-pixel-link0: [drm:imx8qxp_pixel_link_bridge_probe] *ERROR* failed
> to get pixel link node alias id: -19
> [    1.769626] imx8qxp-pxl2dpi 5622100000001000.syscon:pxl2dpi: [drm:imx8qxp_pxl2dpi_bridge_probe] *ERROR*
> failed to get regmap: -12
> [    1.781397] imx8qxp-pxl2dpi: probe of 5622100000001000.syscon:pxl2dpi failed with error -12
> [    1.840547] imx8qxp-lpcg-clk 59580000.clock-controller: deferred probe timeout, ignoring dependency
> [    1.840571] imx8qxp-lpcg-clk: probe of 59580000.clock-controller failed with error -110
> 
> Any suggestions welcome. Thanks!

Please reference the patch set I shared in my last reply and see how it
goes.  Thanks.

Liu Ying

> 
> Cheers
> 
> Marcel
> 
> On Wed, 2021-03-17 at 11:42 +0800, Liu Ying wrote:
> > Hi,
> > 
> > This is the v6 series to add some DRM bridge drivers support
> > for i.MX8qm/qxp SoCs.
> > 
> > The bridges may chain one by one to form display pipes to support
> > LVDS displays.  The relevant display controller is DPU embedded in
> > i.MX8qm/qxp SoCs.
> > 
> > The DPU KMS driver can be found at:
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.spinics.net%2Flists%2Farm-kernel%2Fmsg878542.html&amp;data=04%7C01%7Cvictor.liu%40nxp.com%7C23e9e19a27ae45007db608d8ed977152%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637520581990271723%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=LziYbGruJmOb70UWGvx%2BX0Fx3gsoEtubdiNBpuKcjXw%3D&amp;reserved=0
> > 
> > This series supports the following display pipes:
> > 1) i.MX8qxp:
> > prefetch eng -> DPU -> pixel combiner -> pixel link ->
> > pixel link to DPI(PXL2DPI) -> LVDS display bridge(LDB)
> > 
> > 2) i.MX8qm:
> > prefetch eng -> DPU -> pixel combiner -> pixel link -> LVDS display bridge(LDB)
> > 
> > 
> > This series dropped the patch 'phy: Add LVDS configuration options', as
> > suggested by Robert Foss, because it has already been sent with the following
> > series to add Mixel combo PHY found in i.MX8qxp:
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.spinics.net%2Flists%2Farm-kernel%2Fmsg879957.html&amp;data=04%7C01%7Cvictor.liu%40nxp.com%7C23e9e19a27ae45007db608d8ed977152%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637520581990271723%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=lPUkWoIHjpBM5dZjFiaNjmQaQgcfIAHx%2FyRtQjZ%2B3po%3D&amp;reserved=0
> > 
> > So, this version depends on that series.
> > 
> > 
> > Patch 1/14 and 2/14 add bus formats used by pixel combiner.
> > 
> > Patch 7/14 adds dt-binding for Control and Status Registers module(a syscon
> > used by PXL2DPI and LDB), which references the PXL2DPI and LDB schemas.
> > 
> > Patch 10/14 adds a helper for LDB bridge drivers.
> > 
> > Patch 3/14 ~ 6/14, 8/14, 9/14 and 11/14 ~ 13/14 add drm bridge drivers and
> > dt-bindings support for the bridges.
> > 
> > Patch 14/14 updates MAINTAINERS.
> > 
> > 
> > I've tested this series with a koe,tx26d202vm0bwa dual link LVDS panel and
> > a LVDS to HDMI bridge(with a downstream drm bridge driver).
> > 
> > 
> > Welcome comments, thanks.
> > 
> > v5->v6:
> > * Fix data organizations in documentation(patch 2/14) for
> >   MEDIA_BUS_FMT_RGB{666,888}_1X30-CPADLO. (Laurent)
> > * Add Laurent's R-b tags on patch 1/14 and 2/14.
> > * Drop 'select' schema from the CSR dt-binding documentation(patch 7/14). (Rob)
> > * Add Rob's R-b tag on patch 8/14.
> > 
> > v4->v5:
> > * Drop the patch 'phy: Add LVDS configuration options'. (Robert)
> > * Add Robert's R-b tags on patch 1/14, 2/14, 4/14 and 6/14.
> > * Drop the 'PC_BUF_PARA_REG' register definition from the pixel combiner bridge
> >   driver(patch 4/14). (Robert)
> > * Make a comment occupy a line in the pixel link bridge driver(patch 6/14).
> >   (Robert)
> > * Introduce a new patch(patch 7/14) to add dt-binding for Control and Status
> >   Registers module. (Rob)
> > * Make imx-ldb-helper be a pure object to be linked with i.MX8qxp LDB bridge
> >   driver and i.MX8qm LDB bridge driver, instead of a module.  Correspondingly,
> >   rename 'imx8{qm, qxp}-ldb.c' to 'imx8{qm, qxp}-ldb-drv.c'. (Robert)
> > * Move 'imx_ldb_helper.h' to 'drivers/gpu/drm/bridge/imx/imx-ldb-helper.h'.
> >   (Robert)
> > * s/__FSL_IMX_LDB__/__IMX_LDB_HELPER__/  for 'imx-ldb-helper.h'.
> > 
> > v3->v4:
> > * Use 'fsl,sc-resource' DT property to get the SCU resource ID associated with
> >   the PXL2DPI instance instead of using alias ID. (Rob)
> > * Add Rob's R-b tag on patch 11/14.
> > 
> > v2->v3:
> > * Drop 'fsl,syscon' DT properties from fsl,imx8qxp-ldb.yaml and
> >   fsl,imx8qxp-pxl2dpi.yaml. (Rob)
> > * Mention the CSR module controls LDB and PXL2DPI in fsl,imx8qxp-ldb.yaml and
> >   fsl,imx8qxp-pxl2dpi.yaml.
> > * Call syscon_node_to_regmap() to get regmaps from LDB bridge helper driver
> >   and PXL2DPI bridger driver instead of syscon_regmap_lookup_by_phandle().
> > * Drop two macros from pixel link bridge driver which help define functions
> >   and define them directly.
> > * Properly disable all pixel link controls to POR value by calling
> >   imx8qxp_pixel_link_disable_all_controls() from
> >   imx8qxp_pixel_link_bridge_probe().
> > * Add Rob's R-b tags on patch 4/14 and 6/14.
> > 
> > v1->v2:
> > * Rebase the series upon the latest drm-misc-next branch(5.11-rc2 based).
> > * Use graph schema in the dt-bindings of the bridges. (Laurent)
> > * Require all four pixel link output ports in fsl,imx8qxp-pixel-link.yaml.
> >   (Laurent)
> > * Side note i.MX8qm/qxp LDB official name 'pixel mapper' in fsl,imx8qxp-ldb.yaml.
> >   (Laurent)
> > * Mention pixel link is accessed via SCU firmware in fsl,imx8qxp-pixel-link.yaml.
> >   (Rob)
> > * Use enum instead of oneOf + const for the reg property of pixel combiner
> >   channels in fsl,imx8qxp-pixel-combiner.yaml. (Rob)
> > * Rewrite the function to find the next bridge in pixel link bridge driver
> >   by properly using OF APIs and dropping unnecessary DT validation. (Rob)
> > * Drop unnecessary port availability check in i.MX8qxp pixel link to DPI
> >   bridge driver.
> > * Drop unnecessary DT validation from i.MX8qxp LDB bridge driver.
> > * Use of_graph_get_endpoint_by_regs() and of_graph_get_remote_endpoint() to
> >   get the input remote endpoint in imx8qxp_ldb_set_di_id() of i.MX8qxp LDB
> >   bridge driver.
> > * Avoid using companion_port OF node after putting it in
> >   imx8qxp_ldb_parse_dt_companion() of i.MX8qxp LDB bridge driver.
> > * Drop unnecessary check for maximum available LDB channels from
> >   i.MX8qm LDB bridge driver.
> > * Mention i.MX8qm/qxp LDB official name 'pixel mapper' in i.MX8qm/qxp LDB
> >   bridge drivers and Kconfig help messages.
> > 
> > Liu Ying (14):
> >   media: uapi: Add some RGB bus formats for i.MX8qm/qxp pixel combiner
> >   media: docs: Add some RGB bus formats for i.MX8qm/qxp pixel combiner
> >   dt-bindings: display: bridge: Add i.MX8qm/qxp pixel combiner binding
> >   drm/bridge: imx: Add i.MX8qm/qxp pixel combiner support
> >   dt-bindings: display: bridge: Add i.MX8qm/qxp display pixel link
> >     binding
> >   drm/bridge: imx: Add i.MX8qm/qxp display pixel link support
> >   dt-bindings: mfd: Add i.MX8qm/qxp Control and Status Registers module
> >     binding
> >   dt-bindings: display: bridge: Add i.MX8qxp pixel link to DPI binding
> >   drm/bridge: imx: Add i.MX8qxp pixel link to DPI support
> >   drm/bridge: imx: Add LDB driver helper support
> >   dt-bindings: display: bridge: Add i.MX8qm/qxp LVDS display bridge
> >     binding
> >   drm/bridge: imx: Add LDB support for i.MX8qxp
> >   drm/bridge: imx: Add LDB support for i.MX8qm
> >   MAINTAINERS: add maintainer for DRM bridge drivers for i.MX SoCs
> > 
> >  .../bindings/display/bridge/fsl,imx8qxp-ldb.yaml   | 173 +++++
> >  .../display/bridge/fsl,imx8qxp-pixel-combiner.yaml | 144 +++++
> >  .../display/bridge/fsl,imx8qxp-pixel-link.yaml     | 106 +++
> >  .../display/bridge/fsl,imx8qxp-pxl2dpi.yaml        | 108 ++++
> >  .../devicetree/bindings/mfd/fsl,imx8qxp-csr.yaml   | 192 ++++++
> >  .../userspace-api/media/v4l/subdev-formats.rst     | 156 +++++
> >  MAINTAINERS                                        |  10 +
> >  drivers/gpu/drm/bridge/Kconfig                     |   2 +
> >  drivers/gpu/drm/bridge/Makefile                    |   1 +
> >  drivers/gpu/drm/bridge/imx/Kconfig                 |  42 ++
> >  drivers/gpu/drm/bridge/imx/Makefile                |   9 +
> >  drivers/gpu/drm/bridge/imx/imx-ldb-helper.c        | 232 +++++++
> >  drivers/gpu/drm/bridge/imx/imx-ldb-helper.h        |  98 +++
> >  drivers/gpu/drm/bridge/imx/imx8qm-ldb-drv.c        | 586 +++++++++++++++++
> >  drivers/gpu/drm/bridge/imx/imx8qxp-ldb-drv.c       | 720 +++++++++++++++++++++
> >  .../gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c    | 448 +++++++++++++
> >  drivers/gpu/drm/bridge/imx/imx8qxp-pixel-link.c    | 427 ++++++++++++
> >  drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c       | 485 ++++++++++++++
> >  include/uapi/linux/media-bus-format.h              |   6 +-
> >  19 files changed, 3944 insertions(+), 1 deletion(-)
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-ldb.yaml
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-combiner.yaml
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-link.yaml
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pxl2dpi.yaml
> >  create mode 100644 Documentation/devicetree/bindings/mfd/fsl,imx8qxp-csr.yaml
> >  create mode 100644 drivers/gpu/drm/bridge/imx/Kconfig
> >  create mode 100644 drivers/gpu/drm/bridge/imx/Makefile
> >  create mode 100644 drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
> >  create mode 100644 drivers/gpu/drm/bridge/imx/imx-ldb-helper.h
> >  create mode 100644 drivers/gpu/drm/bridge/imx/imx8qm-ldb-drv.c
> >  create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-ldb-drv.c
> >  create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c
> >  create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pixel-link.c
> >  create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c