linux-kernel - Re: [PATCH v2 6/6] drm/meson: add support for MIPI-DSI transceiver

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Message-ID: <b2086dd4-643f-26b3-3930-4d8beb170b75@baylibre.com>
Date:   Thu, 20 Jan 2022 17:30:14 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     dri-devel@...ts.freedesktop.org,
        martin.blumenstingl@...glemail.com,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 6/6] drm/meson: add support for MIPI-DSI transceiver

Hi,

On 20/01/2022 15:24, Jagan Teki wrote:
> On Thu, Jan 20, 2022 at 2:04 PM Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> The Amlogic G12A/G12B/SM1 SoCs embeds a Synopsys DW-MIPI-DSI transceiver (ver 1.21a),
>> with a custom glue managing the IP resets, clock and data input similar to the DW-HDMI
>> Glue on other Amlogic SoCs.
>>
>> This adds support for the Glue managing the transceiver, mimicing the init flow provided
>> by Amlogic to setup the ENCL encoder, the glue, the transceiver, the digital D-PHY and the
>> Analog PHY in the proper way.
>>
>> An optional "MEAS" clock can be enabled to measure the delay between each vsync feeding the
>> DW-MIPI-DSI transceiver.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>  drivers/gpu/drm/meson/Kconfig             |   7 +
>>  drivers/gpu/drm/meson/Makefile            |   1 +
>>  drivers/gpu/drm/meson/meson_dw_mipi_dsi.c | 357 ++++++++++++++++++++++
>>  drivers/gpu/drm/meson/meson_dw_mipi_dsi.h | 160 ++++++++++
>>  4 files changed, 525 insertions(+)
>>  create mode 100644 drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
>>  create mode 100644 drivers/gpu/drm/meson/meson_dw_mipi_dsi.h
>>
>> diff --git a/drivers/gpu/drm/meson/Kconfig b/drivers/gpu/drm/meson/Kconfig
>> index 6c70fc3214af..71a1364b51e1 100644
>> --- a/drivers/gpu/drm/meson/Kconfig
>> +++ b/drivers/gpu/drm/meson/Kconfig
>> @@ -17,3 +17,10 @@ config DRM_MESON_DW_HDMI
>>         default y if DRM_MESON
>>         select DRM_DW_HDMI
>>         imply DRM_DW_HDMI_I2S_AUDIO
>> +
>> +config DRM_MESON_DW_MIPI_DSI
>> +       tristate "MIPI DSI Synopsys Controller support for Amlogic Meson Display"
>> +       depends on DRM_MESON
>> +       default y if DRM_MESON
>> +       select DRM_DW_MIPI_DSI
>> +       select GENERIC_PHY_MIPI_DPHY
>> diff --git a/drivers/gpu/drm/meson/Makefile b/drivers/gpu/drm/meson/Makefile
>> index 833e18c20603..43071bdbd4b9 100644
>> --- a/drivers/gpu/drm/meson/Makefile
>> +++ b/drivers/gpu/drm/meson/Makefile
>> @@ -6,3 +6,4 @@ meson-drm-y += meson_encoder_hdmi.o meson_encoder_dsi.o
>>
>>  obj-$(CONFIG_DRM_MESON) += meson-drm.o
>>  obj-$(CONFIG_DRM_MESON_DW_HDMI) += meson_dw_hdmi.o
>> +obj-$(CONFIG_DRM_MESON_DW_MIPI_DSI) += meson_dw_mipi_dsi.o
> 
> Can the naming convention prefix with dw-mipi-dsi like other glue
> drivers follow?

Seems only rockchip names their glue like that:

$ find drivers/gpu/drm/ -name "*dw*mipi*dsi*.c"
drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
drivers/gpu/drm/stm/dw_mipi_dsi-stm.c

If you look at dw-hdmi it's even worse:

$ find drivers/gpu/drm/ -name "*dw*hdmi*.c" | grep -v mod
drivers/gpu/drm/meson/meson_dw_hdmi.c
drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c
drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
drivers/gpu/drm/imx/dw_hdmi-imx.c
drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c

Neil
> 
> Jagan.
>