linux-kernel - Re: [PATCH v1 0/8] drm/ci: Add support for GPU and display testing

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Date: Tue, 9 Jan 2024 13:38:08 +0000
From: Daniel Stone <daniel@...ishbar.org>
To: Helen Koike <helen.koike@...labora.com>, Dave Airlie <airlied@...il.com>, 
	Sima Vetter <daniel@...ll.ch>, Daniel Stone <daniels@...labora.com>, Emma Anholt <emma@...olt.net>, 
	linux-rockchip <linux-rockchip@...ts.infradead.org>, guilherme.gallo@...labora.com, 
	sergi.blanch.torne@...labora.com, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, dri-devel <dri-devel@...ts.freedesktop.org>, 
	David Heidelberg <david.heidelberg@...labora.com>, Rob Clark <robdclark@...il.com>, 
	linux-mediatek@...ts.infradead.org, linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH v1 0/8] drm/ci: Add support for GPU and display testing

Hi,

On Wed, 20 Dec 2023 at 12:11, Vignesh Raman <vignesh.raman@...labora.com> wrote:
> Some ARM SOCs have a separate display controller and GPU, each with
> different drivers. For mediatek mt8173, the GPU driver is powervr,
> and the display driver is mediatek. In the case of mediatek mt8183,
> the GPU driver is panfrost, and the display driver is mediatek.
> With rockchip rk3288/rk3399, the GPU driver is panfrost, while the
> display driver is rockchip. For amlogic meson, the GPU driver is
> panfrost, and the display driver is meson.
>
> IGT tests run various tests with different xfails and can test both
> GPU devices and KMS/display devices. Currently, in drm-ci for MediaTek,
> Rockchip, and Amlogic Meson platforms, only the GPU driver is tested.
> This leads to incomplete coverage since the display is never tested on
> these platforms. This commit series adds support in drm-ci to run tests
> for both GPU and display drivers for MediaTek, Rockchip, and Amlogic
> Meson platforms.

Thanks a lot for these. The patches need to be squashed to be
bisectable though. For example, patch #2 changes the MTK job names and
adds more jobs, but the corresponding xfail updates only come in #7
and #8. This means we have a span of a few patches where we don't have
useful test results.

A better sequencing would be something like:
  1. add ANX7625 config
  2. refactor _existing_ MTK display jobs to use YAML includes, change
the existing job name, and rename the existing xfail set, remove
IGT_FORCE_DRIVER from the script since it's now set by the job
  3. add MTK Panfrost+PVR GPU jobs with new xfails, add xfail entry to
MAINTAINERS
  4+5: same as 2+3 but for Amlogic
  6+7: same as 2+3 but for Rockchip

Then the separate rename/update xfail commits just disappear, as does
the removal of IGT_FORCE_DRIVER, because it's just done incrementally
as part of the commits which change the related functionality. It's
extremely important that every change can work standalone, instead of
introducing intermediate breakage which is only fixed in later commits
in the series.

Cheers,
Daniel