Date:   Mon, 6 Jan 2020 16:06:04 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        linux-kernel@...r.kernel.org
Cc:     Collabora Kernel ML <kernel@...labora.com>, matthias.bgg@...il.com,
        drinkcat@...omium.org, hsinyi@...omium.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Jonas Karlman <jonas@...boo.se>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Ulrich Hecht <uli@...nd.eu>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        dri-devel@...ts.freedesktop.org, Rob Herring <robh+dt@...nel.org>,
        linux-mediatek@...ts.infradead.org,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Jitao Shi <jitao.shi@...iatek.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v24 0/2] drm/bridge: PS8640 MIPI-to-eDP bridge

Hi,

On 30/12/2019 10:04, Enric Balletbo i Serra wrote:
> Hi all,
> 
> This is another version of the driver. Note that the driver changed
> significally and is a more simply because now is using the panel_bridge
> helpers. Apart from this, I addressed the comments from Maxime, Laurent
> and Ezequiel.
> 
> This bridge is required to have the embedded display working on an Acer
> Chromebook R13 ("Elm"). Hopefully we are a bit more close to have this
> driver merged. If more changes are required, please let me know and I
> will work on it.
> 
> Note: Along these around 20 revisions of this driver I was unable to
> reconstruct the full changelog history, so I'm skipping this. Sorry
> about that, I promise I'll maintain the changelog for future revisions.

I can apply these, but I'll prefer Rob to ack the new YAML bindings or
a go from Laurent/Maxime to go with the actual YAML state.

For patch 2, I think we can keep devm_i2c_new_dummy_device and not use i2c_new_ancillary_device

Neil

> 
> Thanks,
>  Enric
> 
> Changes in v24:
> - Fix GPIO polarity as all GPIO descriptors should be handled as active high (Laurent Pinchart)
> - Make static ps8640_bridge_attach (Ezequiel Garcia)
> - Use a define for the number of lanes (Ezequiel Garcia)
> 
> Changes in v23:
> - Merge mute/unmute functions into one (Nicolas Boichat)
> - Use enum for ENABLE/DISABLE instead of bool (Ezequiel Garcia)
> - Rename mute/unmute to vdo_control and fix error messages (Nicolas Boichat and Enric)
> - Add space between address and address parameter 'address%02x' (Nicolas Boichat)
> - Add Tested-by Hsin-Yi
> - Added me as author after the refactor
> 
> Changes in v22:
> - Migrate to YAML format (Maxime Ripart)
> - Remove mode-sel property.
> - Rename sleep-gpios to powerdown-gpios.
> - Remove sysfs attributes because are not really used (Enric Balletbo)
> - Use enum for address page offsets (Ezequiel Garcia)
> - Remove enable tracking (Enric Balletbo)
> - Use panel_bridge API (Laurent Pinchart)
> - Do not use kernel-doc format for non kernel-doc formatted commands (Enric Balletbo)
> - Remove verbose message for PAGE1_VSTART command (Ezequiel Garcia)
> - Use time_is_after_jiffies idiom (Ezequiel Garcia)
> - Remove unused macros (Ezequiel Garcia)
> - Fix weird alignment in dsi->mode_flags (Laurent Pinchart)
> - Use drm_of_find_panel_or_bridge helper (Laurent Pinchart)
> - Remove mode-sel-gpios as is not used (Laurent Pinchart)
> - Remove error messages to get gpios as the core will already report it (Enric Balletbo)
> - Remove redundant message getting the regulators (Laurent Pinchart)
> - Rename sleep-gpios to powerdown-gpios (Laurent Pinchart)
> - Use ARRAY_SIZE(ps_bridge->page) instead of MAX_DEV when possible (Laurent Pinchart)
> - Fix race with userspace accessing the sysfs attributes (Laurent Pinchart)
> - Remove id_table as is only used on DR platforms (Laurent Pinchart)
> - Convert to new i2c device probe() (Laurent Pinchart)
> - Use i2c_smbus_read/write helpers instead of open coding it (Laurent Pinchart)
> - Remove unnused global variables (Laurent Pinchart)
> - Remove unnused fields in ps8640 struct (Laurent Pinchart)
> - Remove commented-out headers (Laurent Pinchart)
> 
> Changes in v21:
>  - Use devm_i2c_new_dummy_device and fix build issue using deprecated i2c_new_dummy
>  - Fix build issue due missing drm_bridge.h
>  - Do not remove in ps8640_remove device managed resources
> 
> Changes in v19:
>  - fixed return value of ps8640_probe() when no panel is found
> 
> Changes in v18:
>  - followed DRM API changes
>  - use DEVICE_ATTR_RO()
>  - remove firmware update code
>  - add SPDX identifier
> 
> Changes in v17:
>  - remove some unused head files.
>  - add macros for ps8640 pages.
>  - remove ddc_i2c client
>  - add mipi_dsi_device_register_full
>  - remove the manufacturer from the name and i2c_device_id
> 
> Changes in v16:
>  - Disable ps8640 DSI MCS Function.
>  - Rename gpios name more clearly.
>  - Tune the ps8640 power on sequence.
> 
> Changes in v15:
>  - Drop drm_connector_(un)register calls from parade ps8640.
>    The main DRM driver mtk_drm_drv now calls
>    drm_connector_register_all() after drm_dev_register() in the
>    mtk_drm_bind() function. That function should iterate over all
>    connectors and call drm_connector_register() for each of them.
>    So, remove drm_connector_(un)register calls from parade ps8640.
> 
> Changes in v14:
>  - update copyright info.
>  - change bridge_to_ps8640 and connector_to_ps8640 to inline function.
>  - fix some coding style.
>  - use sizeof as array counter.
>  - use drm_get_edid when read edid.
>  - add mutex when firmware updating.
> 
> Changes in v13:
>  - add const on data, ps8640_write_bytes(struct i2c_client *client, const u8 *data, u16 data_len)
>  - fix PAGE2_SW_REST tyro.
>  - move the buf[3] init to entrance of the function.
> 
> Changes in v12:
>  - fix hw_chip_id build warning
> 
> Changes in v11:
>  - Remove depends on I2C, add DRM depends
>  - Reuse ps8640_write_bytes() in ps8640_write_byte()
>  - Use timer check for polling like the routines in <linux/iopoll.h>
>  - Fix no drm_connector_unregister/drm_connector_cleanup when ps8640_bridge_attach fail
>  - Check the ps8640 hardware id in ps8640_validate_firmware
>  - Remove fw_version check
>  - Move ps8640_validate_firmware before ps8640_enter_bl
>  - Add ddc_i2c unregister when probe fail and ps8640_remove
> 
> Jitao Shi (2):
>   Documentation: bridge: Add documentation for ps8640 DT properties
>   drm/bridge: Add I2C based driver for ps8640 bridge
> 
>  .../bindings/display/bridge/ps8640.yaml       | 112 ++++++
>  drivers/gpu/drm/bridge/Kconfig                |  11 +
>  drivers/gpu/drm/bridge/Makefile               |   1 +
>  drivers/gpu/drm/bridge/parade-ps8640.c        | 348 ++++++++++++++++++
>  4 files changed, 472 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/ps8640.yaml
>  create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
> 

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