linux-kernel - Re: [PATCH 00/11] drm/meson: Add G12A Support

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Message-ID: <84e8a61db1be6e83e7dcd9630fde17cfc59eb8a3.camel@baylibre.com>
Date:   Tue, 09 Apr 2019 10:42:37 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        dri-devel@...ts.freedesktop.org
Cc:     linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/11] drm/meson: Add G12A Support

On Mon, 2019-03-25 at 15:18 +0100, Neil Armstrong wrote:
> The Amlogic G12A SoC offers very close Video Display
> functionnalities with it's older GXBB, GXL & GXM predecessors.
> 
> The main differences are :
> - G12A Support now 3 "real" OSD planes with a new Blender module
> - Instead of having a single Scaler for OSD1, G12A has two scaler
>   that can be applied to 2 out of the 3 OSD planes or on the outputs
>   of the blender module.
> - The HDMI PHY now support RX-SENSE, Dynamic HDR and it's registers are
>   now memory mapped instead of using an internal bus.
> - The VPU now support a DSI interface to connect a display, using
>   the Synopsys DSI controller and a custom PHY
> 
> The complex Blender routing, HDMI RX-SENSE, Dynamic HDR and DSI support
> are not handled in this patchset.
> 
> This patchset implements on-par support with the currently support
> GXBB, GXL and GXM SoCs. There is no support delta with this patchset.
> 
> patch 10 & 11 implements the bindings found at [1].
> 
> [1] https://lkml.kernel.org/r/20190313141030.5958-1-narmstrong@baylibre.com
> 
> Neil Armstrong (11):
>   drm/meson: Switch PLL to 5.94GHz base for 297Mhz pixel clock
>   drm/meson: Add registers for G12A SoC
>   drm/meson: Add G12A Support for VPP setup
>   drm/meson: Add G12A Support for VIU setup
>   drm/meson: Add G12A support for OSD1 Plane
>   drm/meson: Add G12A Support for the Overlay video plane
>   drm/meson: Add G12A support for plane handling in CRTC driver
>   drm/meson: Add G12A support for CVBS Encoer
>   drm/meson: Add G12A Video Clock setup
>   drm/meson: Add G12A compatible
>   drm/meson: Add G12A support for the DW-HDMI Glue
> 
>  drivers/gpu/drm/meson/meson_crtc.c      | 269 +++++++++++++++++++-----
>  drivers/gpu/drm/meson/meson_drv.c       |   1 +
>  drivers/gpu/drm/meson/meson_drv.h       |   4 +
>  drivers/gpu/drm/meson/meson_dw_hdmi.c   | 163 +++++++++++---
>  drivers/gpu/drm/meson/meson_dw_hdmi.h   |  32 ++-
>  drivers/gpu/drm/meson/meson_overlay.c   |  10 +-
>  drivers/gpu/drm/meson/meson_plane.c     |  15 +-
>  drivers/gpu/drm/meson/meson_registers.h | 247 ++++++++++++++++++++++
>  drivers/gpu/drm/meson/meson_vclk.c      | 123 +++++++++--
>  drivers/gpu/drm/meson/meson_venc.c      |  11 +-
>  drivers/gpu/drm/meson/meson_venc_cvbs.c |  25 ++-
>  drivers/gpu/drm/meson/meson_viu.c       |  72 ++++++-
>  drivers/gpu/drm/meson/meson_vpp.c       |  51 +++--
>  13 files changed, 880 insertions(+), 143 deletions(-)
> 

on the u200 and sei510
Tested-by: Jerome Brunet <jbrunet@...libre.com>

I can't pretend to have a deep understanding of this subsystem, but as far as
I can tell, there is nothing crazy in there. With the comments around the use
of constants and defines fixed, you can add

Reviewed-by: Jerome Brunet <jbrunet@...libre.com>

As a possible future enhancement, it would be nice if you could trim the use
of *_is_compatible() functions. I think it would make the code easier to
follow and review.