linux-kernel - Re: [PATCH RESEND v10 0/4] Support DRM bridges on NVIDIA Tegra

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Message-ID: <20200917103346.GG3515672@ulmo>
Date:   Thu, 17 Sep 2020 12:33:46 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Sam Ravnborg <sam@...nborg.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v10 0/4] Support DRM bridges on NVIDIA Tegra

On Fri, Aug 14, 2020 at 01:06:52AM +0300, Dmitry Osipenko wrote:
> Hello,
> 
> This series adds initial support for the DRM bridges to NVIDIA Tegra DRM
> driver. This is required by newer device-trees where we model the LVDS
> encoder bridge properly. In particular this series is needed in order to
> light up display panels of recently merged Acer A500 and Nexus 7 devices.
> 
> Changelog:
> 
> v10: - No changes. Patches missed v5.9 kernel, re-sending for v5.10.
>        @Thierry, please pick up this series into linux-next or let me
>        know what needs to be changed, thanks in advance!
> 
> v9: - Dropped the of-graph/drm-of patches from this series because they
>       are now factored out into a standalone series [1].
> 
>       [1] https://patchwork.ozlabs.org/project/linux-tegra/list/?series=186813
> 
>     - The "drm/panel-simple: Add missing connector type for some panels"
>       patch of v8 was already applied.
> 
> v8: - The new of_graph_get_local_port() helper is replaced with the
>       of_graph_presents(), which simply checks the graph presence in a
>       given DT node. Thank to Laurent Pinchart for the suggestion!
> 
>     - The of_graph_get_local_port() is still there, but now it isn't a public
>       function anymore. In the review to v7 Laurent Pinchart suggested that
>       the function's doc-comments and name could be improved and I implemented
>       these suggestions in v8.
> 
>     - A day ago I discovered that devm_drm_panel_bridge_add() requires
>       panel to have connector type to be properly set, otherwise function
>       rejects panels with the incomplete description. So, I checked what
>       LVDS panels are used on Tegra and fixed the missing connector types
>       in this new patch:
> 
>         drm/panel-simple: Add missing connector type for some panels
> 
> v7: - Removed the obscure unused structs (which GCC doesn't detect, but CLANG
>       does) in the patch "Wrap directly-connected panel into DRM bridge",
>       which was reported by kernel test robot for v6.
> 
> v6: - Added r-b and acks from Rob Herring and Sam Ravnborg.
> 
>     - Rebased on a recent linux-next, patches now apply without fuzz.
> 
> v5: - Added new patches that make drm_of_find_panel_or_bridge() more usable
>       if graph isn't defined in a device-tree:
> 
>         of_graph: add of_graph_get_local_port()
>         drm/of: Make drm_of_find_panel_or_bridge() to check graph's presence
> 
>     - Updated "Support DRM bridges" patch to use drm_of_find_panel_or_bridge()
>       directly and added WARN_ON(output->panel || output->bridge) sanity-check.
> 
>     - Added new "Wrap directly-connected panel into DRM bridge" patch, as
>       was suggested by Laurent Pinchart.
> 
> v4: - Following review comments that were made by Laurent Pinchart to the v3,
>       we now create and use the "bridge connector".
> 
> v3: - Following recommendation from Sam Ravnborg, the new bridge attachment
>       model is now being used, i.e. we ask bridge to *not* create a connector
>       using the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag.
> 
>     - The bridge is now created only for the RGB (LVDS) output, and only
>       when necessary. For now we don't need bridges for HDMI or DSI outputs.
> 
>     - I noticed that we're leaking OF node in the panel's error code path,
>       this is fixed now by the new patch "Don't leak OF node on error".
> 
> v2: - Added the new "rgb: Don't register connector if bridge is used"
>       patch, which hides the unused connector provided by the Tegra DRM
>       driver when bridge is used, since bridge provides its own connector
>       to us.
> 
> 
> Dmitry Osipenko (4):
>   drm/tegra: output: Don't leak OF node on error
>   drm/tegra: output: Support DRM bridges
>   drm/tegra: output: rgb: Support LVDS encoder bridge
>   drm/tegra: output: rgb: Wrap directly-connected panel into DRM bridge
> 
>  drivers/gpu/drm/tegra/drm.h    |   2 +
>  drivers/gpu/drm/tegra/output.c |  21 +++++--
>  drivers/gpu/drm/tegra/rgb.c    | 102 +++++++++++++++++----------------
>  3 files changed, 72 insertions(+), 53 deletions(-)

Applied to drm/tegra/for-next, thanks.

Thierry

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