linux-kernel - Re: [PATCH v2 6/7] drm/tests: hdmi: Add limited range tests for YUV420 mode

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Message-ID: <dca413e0-bad5-485d-9c77-402d806e97a5@collabora.com>
Date: Wed, 12 Mar 2025 00:54:51 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>,
 Dave Stevenson <dave.stevenson@...pberrypi.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, kernel@...labora.com,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/7] drm/tests: hdmi: Add limited range tests for
 YUV420 mode

On 3/11/25 6:17 PM, Maxime Ripard wrote:
> On Tue, Mar 11, 2025 at 12:57:38PM +0200, Cristian Ciocaltea wrote:
>> Provide tests to verify that drm_atomic_helper_connector_hdmi_check()
>> helper behaviour when using YUV420 output format is to always set the
>> limited RGB quantization range to 'limited', no matter what the value of
>> Broadcast RGB property is.

[...]

> We need more tests than that to test the various combinations, whether
> the fallback to YUV420 should work or not depending on the EDID, the
> driver capabilities, YUV420-only vs YUV420-also, etc.

Some fallback tests were provided in the next patch, including checks like:

  KUNIT_ASSERT_TRUE(test, drm_mode_is_420_only(info, yuv420_only_mode));
  KUNIT_ASSERT_TRUE(test, drm_mode_is_420_also(info, preferred));

I'll try to further extend the test coverage.

Regards,
Cristian