Re: [PATCH v3 00/19] Add Freescale i.MX8qxp Display Controller support

[Liu Ying]

On 07/28/2024, Dmitry Baryshkov wrote:
> On Wed, Jul 24, 2024 at 05:29:31PM GMT, Liu Ying wrote:
>> Hi,
>>
>> This patch series aims to add Freescale i.MX8qxp Display Controller support.
>>
>> The controller is comprised of three main components that include a blit
>> engine for 2D graphics accelerations, display controller for display output
>> processing, as well as a command sequencer.
>>
>> Previous patch series attempts to do that can be found at:
>> https://patchwork.freedesktop.org/series/84524/
>>
>> This series addresses Maxime's comments on the previous one:
>> a. Split the display controller into multiple internal devices.
>>    1) List display engine, pixel engine, interrupt controller and more as the
>>       controller's child devices.
>>    2) List display engine and pixel engine's processing units as their child
>>       devices.
>>
>> b. Add minimal feature support.
>>    Only support two display pipelines with primary planes with XR24 fb,
>>    backed by two fetchunits.  No fetchunit dynamic allocation logic(to be done
>>    when necessary).
>>
>> c. Use drm_dev_{enter, exit}().
>>
>> Since this series changes a lot comparing to the previous one, I choose to
>> send it with a new patch series, not a new version.
> 
> I'm sorry, I have started reviewing v2 without noticing that there is a
> v3 already.

I've replied your comments on v2.

Thanks for your review!

> 
> Let me summarize my comments:
> 
> - You are using OF aliases. Are they documented and acked by DT
>   maintainers?

As I replied in v2, I may document them if needed.
No Nack/Ack from DT maintainers as of now.

> 
> - I generally feel that the use of so many small devices to declare
>   functional blocks is an abuse of the DT. Please consider creating
>   _small_ units from the driver code directly rather than going throught
>   the components. Also please describe how everything fits together in
>   the cover letter.

As I replied in v2, they are modelled as separated devices and kinda
accepted by Maxime and Rob.

I'll try to describe more in cover letter.

> 
> - I assume that there more functional units that you are cunrretly
>   adding and there is more versatility. Please describe that in the
>   commit messages.

I've documented all processing units and the other devices in the
main display controller, nothing more.

I'll list all processing units in commit message in next version.

> 
> - I see a lot of small functions, which can be inlined without the lost
>   of code clarify. Please consider self-reviewing your code from this
>   perspective.

Can you please point out typical ones in patches in question?

> 
> - There were other small comments, but I think they are less important
>   now. You might still consider them for v4.

Thanks again for your review.

> 
>> To follow up i.MX8qxp TRM, I changed the controller name to "Display Controller"
>> instead of the previous "DPU".  "DPU" is only mentioned in the SoC block
>> diagram and represents the whole display subsystem which includes the display
>> controller and prefech engines, etc.
>>
>> With an additional patch[1] for simple-pm-bus.c, this series facilitates
>> testing a LVDS panel on i.MX8qxp MEK.
>>
>> Please do NOT merge patch 14-19.
>>
>> [1] https://lkml.org/lkml/2023/1/25/120
>>
>> v3:
>> * Collect Rob's R-b tag on the patch for adding fsl,imx8qxp-dc-intc.yaml.
>> * Combine fsl,imx8qxp-dc-fetchunit-common.yaml,
>>   fsl,imx8qxp-dc-fetchlayer.yaml and fsl,imx8qxp-dc-fetchwarp.yaml
>>   into 1 schema doc fsl,imx8qxp-dc-fetchunit.yaml. (Rob)
>> * Document all processing units, command sequencer, axi performance counter
>>   and blit engine. (Rob)
>>
>> v2:
>> * Drop fsl,dc-*-id DT properties from fsl,imx8qxp-dc*.yaml. (Krzysztof)
>> * Move port property from fsl,imx8qxp-dc-display-engine.yaml to
>>   fsl,imx8qxp-dc-tcon.yaml. (Krzysztof)
>> * Drop unneeded "|" from fsl,imx8qxp-dc-intc.yaml. (Krzysztof)
>> * Use generic pmu pattern property in fsl,imx8qxp-dc.yaml. (Krzysztof)
>> * Fix register range size in fsl,imx8qxp-dc*.yaml.
>> * Use OF alias id to get instance id from display driver.
>> * Find next bridge from TCon's port from display driver.
>> * Drop drm/drm_module.h include from dc-drv.c.
>> * Improve file list in MAINTAINERS. (Frank)
>> * Add entire i.MX8qxp display controller device tree for review. (Krzysztof)
>> * Add MIPI/LVDS subsystems device tree and a DT overlay for imx8qxp
>>   MEK to test a LVDS panel as an example. (Francesco)
>>
>> Liu Ying (19):
>>   dt-bindings: display: imx: Add i.MX8qxp Display Controller processing
>>     units
>>   dt-bindings: display: imx: Add i.MX8qxp Display Controller blit engine
>>   dt-bindings: display: imx: Add i.MX8qxp Display Controller display
>>     engine
>>   dt-bindings: display: imx: Add i.MX8qxp Display Controller pixel
>>     engine
>>   dt-bindings: display: imx: Add i.MX8qxp Display Controller AXI
>>     performance counter
>>   dt-bindings: display: imx: Add i.MX8qxp Display Controller command
>>     sequencer
>>   dt-bindings: interrupt-controller: Add i.MX8qxp Display Controller
>>     interrupt controller
>>   dt-bindings: display: imx: Add i.MX8qxp Display Controller
>>   drm/imx: Add i.MX8qxp Display Controller display engine
>>   drm/imx: Add i.MX8qxp Display Controller pixel engine
>>   drm/imx: Add i.MX8qxp Display Controller interrupt controller
>>   drm/imx: Add i.MX8qxp Display Controller KMS
>>   MAINTAINERS: Add maintainer for i.MX8qxp Display Controller
>>   dt-bindings: phy: mixel,mipi-dsi-phy: Allow assigned-clock* properties
>>   dt-bindings: firmware: imx: Add SCU controlled display pixel link
>>     nodes
>>   arm64: dts: imx8qxp: Add display controller subsystem
>>   arm64: dts: imx8qxp: Add MIPI-LVDS combo subsystems
>>   arm64: dts: imx8qxp-mek: Enable display controller
>>   arm64: dts: imx8qxp-mek: Add MX8-DLVDS-LCD1 display module support
>>
>>  ...sl,imx8qxp-dc-axi-performance-counter.yaml |  57 ++
>>  .../imx/fsl,imx8qxp-dc-blit-engine.yaml       | 204 +++++++
>>  .../display/imx/fsl,imx8qxp-dc-blitblend.yaml |  41 ++
>>  .../display/imx/fsl,imx8qxp-dc-clut.yaml      |  44 ++
>>  .../imx/fsl,imx8qxp-dc-command-sequencer.yaml |  67 ++
>>  .../imx/fsl,imx8qxp-dc-constframe.yaml        |  44 ++
>>  .../imx/fsl,imx8qxp-dc-display-engine.yaml    | 152 +++++
>>  .../display/imx/fsl,imx8qxp-dc-dither.yaml    |  45 ++
>>  .../display/imx/fsl,imx8qxp-dc-extdst.yaml    |  72 +++
>>  .../display/imx/fsl,imx8qxp-dc-fetchunit.yaml | 141 +++++
>>  .../display/imx/fsl,imx8qxp-dc-filter.yaml    |  43 ++
>>  .../display/imx/fsl,imx8qxp-dc-framegen.yaml  |  64 ++
>>  .../display/imx/fsl,imx8qxp-dc-gammacor.yaml  |  32 +
>>  .../imx/fsl,imx8qxp-dc-layerblend.yaml        |  39 ++
>>  .../display/imx/fsl,imx8qxp-dc-matrix.yaml    |  44 ++
>>  .../imx/fsl,imx8qxp-dc-pixel-engine.yaml      | 250 ++++++++
>>  .../display/imx/fsl,imx8qxp-dc-rop.yaml       |  43 ++
>>  .../display/imx/fsl,imx8qxp-dc-safety.yaml    |  34 ++
>>  .../imx/fsl,imx8qxp-dc-scaling-engine.yaml    |  83 +++
>>  .../display/imx/fsl,imx8qxp-dc-signature.yaml |  53 ++
>>  .../display/imx/fsl,imx8qxp-dc-store.yaml     |  96 +++
>>  .../display/imx/fsl,imx8qxp-dc-tcon.yaml      |  45 ++
>>  .../bindings/display/imx/fsl,imx8qxp-dc.yaml  | 236 +++++++
>>  .../devicetree/bindings/firmware/fsl,scu.yaml |  20 +
>>  .../fsl,imx8qxp-dc-intc.yaml                  | 318 ++++++++++
>>  .../bindings/phy/mixel,mipi-dsi-phy.yaml      |   5 -
>>  MAINTAINERS                                   |   8 +
>>  arch/arm64/boot/dts/freescale/Makefile        |   4 +
>>  .../arm64/boot/dts/freescale/imx8-ss-dc0.dtsi | 408 +++++++++++++
>>  .../imx8qxp-mek-mx8-dlvds-lcd1-lvds0-odd.dtso | 183 ++++++
>>  arch/arm64/boot/dts/freescale/imx8qxp-mek.dts |  34 ++
>>  .../boot/dts/freescale/imx8qxp-ss-dc.dtsi     | 240 ++++++++
>>  .../dts/freescale/imx8qxp-ss-mipi-lvds.dtsi   | 437 +++++++++++++
>>  arch/arm64/boot/dts/freescale/imx8qxp.dtsi    |  28 +-
>>  drivers/gpu/drm/imx/Kconfig                   |   1 +
>>  drivers/gpu/drm/imx/Makefile                  |   1 +
>>  drivers/gpu/drm/imx/dc/Kconfig                |   8 +
>>  drivers/gpu/drm/imx/dc/Makefile               |   7 +
>>  drivers/gpu/drm/imx/dc/dc-cf.c                | 157 +++++
>>  drivers/gpu/drm/imx/dc/dc-crtc.c              | 578 ++++++++++++++++++
>>  drivers/gpu/drm/imx/dc/dc-crtc.h              |  67 ++
>>  drivers/gpu/drm/imx/dc/dc-de.c                | 151 +++++
>>  drivers/gpu/drm/imx/dc/dc-de.h                |  65 ++
>>  drivers/gpu/drm/imx/dc/dc-drv.c               | 275 +++++++++
>>  drivers/gpu/drm/imx/dc/dc-drv.h               |  54 ++
>>  drivers/gpu/drm/imx/dc/dc-ed.c                | 266 ++++++++
>>  drivers/gpu/drm/imx/dc/dc-fg.c                | 366 +++++++++++
>>  drivers/gpu/drm/imx/dc/dc-fl.c                | 136 +++++
>>  drivers/gpu/drm/imx/dc/dc-fu.c                | 241 ++++++++
>>  drivers/gpu/drm/imx/dc/dc-fu.h                | 129 ++++
>>  drivers/gpu/drm/imx/dc/dc-fw.c                | 149 +++++
>>  drivers/gpu/drm/imx/dc/dc-ic.c                | 249 ++++++++
>>  drivers/gpu/drm/imx/dc/dc-kms.c               | 143 +++++
>>  drivers/gpu/drm/imx/dc/dc-kms.h               |  15 +
>>  drivers/gpu/drm/imx/dc/dc-lb.c                | 300 +++++++++
>>  drivers/gpu/drm/imx/dc/dc-pe.c                | 140 +++++
>>  drivers/gpu/drm/imx/dc/dc-pe.h                |  91 +++
>>  drivers/gpu/drm/imx/dc/dc-plane.c             | 227 +++++++
>>  drivers/gpu/drm/imx/dc/dc-plane.h             |  37 ++
>>  drivers/gpu/drm/imx/dc/dc-tc.c                | 137 +++++
>>  60 files changed, 7598 insertions(+), 6 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-axi-performance-counter.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-blit-engine.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-blitblend.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-clut.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-command-sequencer.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-constframe.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-display-engine.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-dither.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-extdst.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-fetchunit.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-filter.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-framegen.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-gammacor.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-layerblend.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-matrix.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-pixel-engine.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-rop.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-safety.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-scaling-engine.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-signature.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-store.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-tcon.yaml
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc.yaml
>>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/fsl,imx8qxp-dc-intc.yaml
>>  create mode 100644 arch/arm64/boot/dts/freescale/imx8-ss-dc0.dtsi
>>  create mode 100644 arch/arm64/boot/dts/freescale/imx8qxp-mek-mx8-dlvds-lcd1-lvds0-odd.dtso
>>  create mode 100644 arch/arm64/boot/dts/freescale/imx8qxp-ss-dc.dtsi
>>  create mode 100644 arch/arm64/boot/dts/freescale/imx8qxp-ss-mipi-lvds.dtsi
>>  create mode 100644 drivers/gpu/drm/imx/dc/Kconfig
>>  create mode 100644 drivers/gpu/drm/imx/dc/Makefile
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-cf.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-crtc.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-crtc.h
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-de.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-de.h
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-drv.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-drv.h
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-ed.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-fg.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-fl.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-fu.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-fu.h
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-fw.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-ic.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-kms.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-kms.h
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-lb.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-pe.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-pe.h
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-plane.c
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-plane.h
>>  create mode 100644 drivers/gpu/drm/imx/dc/dc-tc.c
>>
>> -- 
>> 2.34.1
>>
> 

-- 
Regards,
Liu Ying