linux-kernel - Re: [PATCH v2 0/2] drm/panel: Add support for Raydium RM68200 panel

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Date:   Mon, 12 Mar 2018 15:59:59 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     David Airlie <airlied@...ux.ie>, Rob Herring <robh+dt@...nel.org>,
        "Mark Rutland" <mark.rutland@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        "Yannick FERTRE" <yannick.fertre@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Vincent ABRIOU <vincent.abriou@...com>,
        Alexandre TORGUE <alexandre.torgue@...com>
Subject: Re: [PATCH v2 0/2] drm/panel: Add support for Raydium RM68200 panel

Hi Thierry,

On 03/12/2018 09:04 AM, Thierry Reding wrote:
> On Fri, Mar 02, 2018 at 04:32:20PM +0100, Philippe Cornu wrote:
>> The Raydium Semiconductor Corporation RM68200 is a 5.5" 720x1280
>> TFT LCD panel connected using a MIPI-DSI video interface.
>>
>> Version 2:
>> - Add Rob Herring Reviewed-by on dt-bindings.
>> - Update Kconfig & driver thanks to Thierry Reding comments: no more
>>    DRV_NAME, DRM_WARN_ONCE instead of DRV_NAME where applicable, use
>>    backlight_enable/disable() & devm_of_find_backlight(), no extra
>>    gpio reset to 0, no more msg if successful, use RM68200 instead of
>>    rm68200 where necessary.
>>
>> Version 1:
>> - Initial commit
>>
>> Philippe Cornu (2):
>>    dt-bindings/display/panel: Add support for Raydium rm68200 dsi panel
>>    drm/panel: Add support for Raydium RM68200 panel driver
>>
>>   .../bindings/display/panel/raydium,rm68200.txt     |  25 ++
>>   drivers/gpu/drm/panel/Kconfig                      |   8 +
>>   drivers/gpu/drm/panel/Makefile                     |   1 +
>>   drivers/gpu/drm/panel/panel-raydium-rm68200.c      | 437 +++++++++++++++++++++
>>   4 files changed, 471 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/display/panel/raydium,rm68200.txt
>>   create mode 100755 drivers/gpu/drm/panel/panel-raydium-rm68200.c
> 
> Applied, thanks. There were a few tiny things I wasn't entirely happy
> about, but I fixed those up myself.
> 
> Most notable was the use of DRM_WARN_ONCE(), which is bad in this case
> because it won't show any subsequent errors, ever again. I think in this
> case the proper solution is DRM_ERROR_RATELIMITED(), or erroring out on
> the first error, assuming that subsequent operations won't succeed
> either. I went with the rate limitation.

Big thank you for your nice cleanups and reworks, I will follow those in 
the future :-)

I take the opportunity to thank you also for the merge of the 2 otm8009a 
patches.

Moreover, if you think I need to update otm8009a driver with the same 
reworks (include order, DRM_ERROR_RATELIMITED, error msg, remove msg if 
successfull, struct data alignment...), please tell me :)
Note: I plan to update it soon with new backlight_enable/disable api...

Thank you again,
Philippe :-)

> 
> Thierry
>