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

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Date:   Sat,  3 Jul 2021 04:32:42 -0700
From:   Kalyan Thota <kalyan_t@...eaurora.org>
To:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Kalyan Thota <kalyan_t@...eaurora.org>,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, mkrishn@...eaurora.org
Subject: [RFC] Inline rotation support in dpu driver

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
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(-)

-- 
2.7.4