linux-kernel - Re: [RFC] Inline rotation support in dpu driver

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Date:   Sun, 4 Jul 2021 11:25:44 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kalyan Thota <kalyan_t@...eaurora.org>,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, mkrishn@...eaurora.org
Subject: Re: [RFC] Inline rotation support in dpu driver

On 03/07/2021 14:32, Kalyan Thota wrote:
> This change adds support for inline rotation in the dpu driver.
> When inline rotation is enabled the VIG pipes will directly fetch the image
> from memory in a rotated fashion
> 
> Inline rotation has following restrictions
> 1) Supported only with compressed formats

NV12, which is the only format you declare, is not compressed.

> 2) max pre rotated height is 1088
> 3) restrictions with downscaling ratio
> 
> Queries:
> 
> 1) Since inline rotation works for fewer pixel formats with specific modifier, how can we provide this information to the compositor so that
> chrome compositor can choose between overlaying or falling back to GPU. In the patch it fails in the atomic check.
> 
> 2) If a display composition fails in atomic check due to any of the restrictions in overlays
> can chrome compositor switch it back to the GPU and re trigger the commit ?
> 
> posting it as RFC as validation is not complete, please share early comments on this.
> 
> Kalyan Thota (1):
>    drm/msm/disp/dpu1: add support for inline rotation in dpu driver
> 
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c | 47 +++++++++----
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 20 ++++++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c      | 93 ++++++++++++++++++++------
>   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h      |  2 +
>   4 files changed, 128 insertions(+), 34 deletions(-)
> 


-- 
With best wishes
Dmitry