linux-kernel - Re: [Freedreno] [PATCH 3/3] drm/msm/dsi: Enable DATABUS

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Date:   Fri, 23 Jun 2023 03:41:46 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>
Cc:     freedreno@...ts.freedesktop.org, Sean Paul <sean@...rly.run>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Rob Clark <robdclark@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
        David Airlie <airlied@...il.com>
Subject: Re: [Freedreno] [PATCH 3/3] drm/msm/dsi: Enable DATABUS_WIDEN for DSI
 command mode

On 23/06/2023 03:01, Abhinav Kumar wrote:
> 
> 
> On 6/14/2023 2:56 AM, Marijn Suijten wrote:
>> On 2023-06-13 18:57:13, Jessica Zhang wrote:
>>> DSI 6G v2.5.x+ supports a data-bus widen mode that allows DSI to send
>>> 48 bits of compressed data per pclk instead of 24.
>>>
>>> For all chipsets that support this mode, enable it whenever DSC is
>>> enabled as recommend by the hardware programming guide.
>>>
>>> Only enable this for command mode as we are currently unable to validate
>>> it for video mode.
>>>
>>> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
>>> ---
>>>
>>> Note: The dsi.xml.h changes were generated using the headergen2 
>>> script in
>>> envytools [1], but the changes to the copyright and rules-ng-ng 
>>> source file
>>> paths were dropped.
>>>
>>> [1] https://github.com/freedreno/envytools/
>>
>> More interesting would be a link to the Mesa MR upstreaming this
>> bitfield to dsi.xml [2] (which I have not found on my own yet).
>>
>> [2]: 
>> https://gitlab.freedesktop.org/mesa/mesa/-/blame/main/src/freedreno/registers/dsi/dsi.xml
>>
> 
> Thats because we havent submitted a MR yet for this on mesa.
> 
> Generally, our team does not have legal permissions yet for mesa MRs 
> other than mesa drm because we got permissions for the modetest.
> 
> Rob/Dmitry, can one of you pls help with the corresponding mesa MR for 
> this?
> 
> The xml file change was autogenerated so this patch can go in.

Ack, I'll handle it.


-- 
With best wishes
Dmitry