linux-kernel - Re: [PATCH V3 0/4] megachips-stdpxxxx-ge-b850v3-fw

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Date:   Mon, 6 Mar 2017 15:27:16 +0530
From:   Archit Taneja <architt@...eaurora.org>
To:     Peter Senna Tschudin <peter.senna@...labora.com>
Cc:     airlied@...ux.ie, akpm@...ux-foundation.org,
        daniel.vetter@...ll.ch, davem@...emloft.net,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        enric.balletbo@...labora.com, eballetbo@...il.com,
        galak@...eaurora.org, gregkh@...uxfoundation.org, heiko@...ech.de,
        ijc+devicetree@...lion.org.uk, javier@...hile0.org, jslaby@...e.cz,
        kernel@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
        linux@...linux.org.uk, linux-kernel@...r.kernel.org,
        linux@...ck-us.net, mark.rutland@....com, martin.donnelly@...com,
        martyn.welch@...labora.co.uk, mchehab@....samsung.com,
        pawel.moll@....com, peter.senna@...il.com, p.zabel@...gutronix.de,
        thierry.reding@...il.com, rmk+kernel@...linux.org.uk,
        robh+dt@...nel.org, shawnguo@...nel.org, tiwai@...e.com,
        treding@...dia.com, laurent.pinchart@...asonboard.com
Subject: Re: [PATCH V3 0/4] megachips-stdpxxxx-ge-b850v3-fw

Hi,

On 3/3/2017 9:27 PM, Peter Senna Tschudin wrote:
> The video processing pipeline on the second output on the GE B850v3:
>
>   Host -> LVDS|--(STDP4028)--|DP -> DP|--(STDP2690)--|DP++ -> Video output
>
> Each bridge has a dedicated flash containing firmware for supporting the
> custom design. The result is that in this design neither the STDP4028
> nor the STDP2690 behave as the stock bridges would. The compatible
> strings include the suffix "-ge-b850v3-fw" to make it clear that the
> driver is for the bridges with the firmware which is specific for the GE
> B850v3.
>
> The driver is powerless to control the video processing pipeline, as the
> two bridges behaves as a single one. The driver is only needed for
> telling the host about EDID / HPD, and for giving the host powers to ack
> interrupts.

queued Patches 1,2 and 3 to drm-misc-next. Made stdp2690_get_edid static
in Patch #3 to fix a sparse warning.

Thanks,
Archit

>
> Changes from V2:
>  - Added Acked-by: Rob Herring <robh@...nel.org> on patch 1/4
>  - Fixed the driver to allow it to be compiled as a module
>
> Changes from V1:
>  - Fix bindings documentation
>  - Fix white space issues on the driver
>  - Improved ge_b850v3_lvds_remove() to not rely on ge_b850v3_lvds_ptr->edid
>
> Changes from V7(was GE B850v3 LVDS/DP++ Bridge):
>  - New devicetree binding with one node per bridge, and two ports per bridge
>  - Two i2c_devices, one per bridge
>  - Removed uneeded mutexes
>  - Moved documentation to bindings/display/bridge
>  - Included test for EDID extension blocks
>  - Renamed bridge pointer to ge_b850v3_lvds_ptr
>  - Removed the call to drm_helper_hpd_irq_event()
>  - Removed assignments to bridge.driver_private
>
> Changes from V6:
>  - Removed check for pixel clock as the bridge supports up to 330Mhz while the
>    host is limited to 264 MHz in very specific conditions.
>  - Added a second mutex to avoid concurrency issues while acking interrupts
>    from threaded interrupt handlers.
>  - Renamed the edid mutex to be more descriptive.
>  - Added a .detach() function that disables the interrupts.
>  - Adopted i2c_new_secondary_device() and updated the dts and documentation to
>    match the new method.
>  - Removed useless test to drm_bridge_add()
>  - Did some refactoring around devm_request_threaded_irq()
>  - Added a missing call to i2c_unregister_device() on the i2c_driver.remove()
>    function.
>
> Changes from V5:
>  - Change to MAINTAINERS in a separate patch
>  - Reworked interrupt handler initialization
>  - Removed useless calls to: drm_connector_register(),
>    drm_helper_hpd_irq_event(), and drm_bridge_enable()
>
> Changes from V4:
>  - Renamed the i2c_driver.name from "ge,b850v3-lvds-dp" to "b850v3-lvds-dp" to
>    remove the comma from the driver name
>
> Changes from V3:
>  - Removed the patch that was configuring the mapping between IPUs and external
>    displays on the dts file
>
> Peter Senna Tschudin (4):
>   dt-bindings: display: megachips-stdpxxxx-ge-b850v3-fw
>   MAINTAINERS: Add entry for megachips-stdpxxxx-ge-b850v3-fw
>   drm/bridge: Drivers for megachips-stdpxxxx-ge-b850v3-fw (LVDS-DP++)
>   dts/imx6q-b850v3: Use megachips-stdpxxxx-ge-b850v3-fw bridges
>     (LVDS-DP++)
>
>  .../bridge/megachips-stdpxxxx-ge-b850v3-fw.txt     |  94 +++++
>  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
>  MAINTAINERS                                        |   8 +
>  arch/arm/boot/dts/imx6q-b850v3.dts                 |  68 ++++
>  drivers/gpu/drm/bridge/Kconfig                     |  11 +
>  drivers/gpu/drm/bridge/Makefile                    |   1 +
>  .../drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c   | 428 +++++++++++++++++++++
>  7 files changed, 611 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/megachips-stdpxxxx-ge-b850v3-fw.txt
>  create mode 100644 drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
>

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