linux-kernel - Re: [PATCH v3 13/15] drm/tests: hdmi: Add limited range tests for YUV420 mode

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Message-ID: <20250410-daffodil-toucanet-of-effort-b4dcbd@houat>
Date: Thu, 10 Apr 2025 09:18:04 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
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@....qualcomm.com>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	kernel@...labora.com, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 13/15] drm/tests: hdmi: Add limited range tests for
 YUV420 mode

On Wed, Mar 26, 2025 at 12:20:02PM +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.
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> ---
>  drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c |  89 +++++++++++++++-
>  drivers/gpu/drm/tests/drm_kunit_edid.h             | 112 +++++++++++++++++++++
>  2 files changed, 196 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> index 6897515189a0649a267196b246944efc92ace336..3fae7ccf65309a1d8a4acf12de961713b9163096 100644
> --- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> @@ -731,6 +731,88 @@ static void drm_test_check_broadcast_rgb_limited_cea_mode_vic_1(struct kunit *te
>  	drm_modeset_acquire_fini(&ctx);
>  }
>  
> +/*
> + * Test that for an HDMI connector, with an HDMI monitor, we will
> + * get a limited RGB Quantization Range with a YUV420 mode, no
> + * matter what the value of the Broadcast RGB property is set to.
> + */
> +static void drm_test_check_broadcast_rgb_cea_mode_yuv420(struct kunit *test)
> +{
> +	struct drm_atomic_helper_connector_hdmi_priv *priv;
> +	enum drm_hdmi_broadcast_rgb broadcast_rgb;
> +	struct drm_modeset_acquire_ctx ctx;
> +	struct drm_connector_state *conn_state;
> +	struct drm_atomic_state *state;
> +	struct drm_display_mode *mode;
> +	struct drm_connector *conn;
> +	struct drm_device *drm;
> +	struct drm_crtc *crtc;
> +	int ret;
> +
> +	broadcast_rgb = *(enum drm_hdmi_broadcast_rgb *)test->param_value;
> +
> +	priv = drm_kunit_helper_connector_hdmi_init_with_edid(test,
> +				BIT(HDMI_COLORSPACE_RGB) |
> +				BIT(HDMI_COLORSPACE_YUV420),
> +				8,
> +				test_edid_hdmi_1080p_rgb_yuv_4k_yuv420_dc_max_200mhz);
> +	KUNIT_ASSERT_NOT_NULL(test, priv);
> +
> +	drm = &priv->drm;
> +	crtc = priv->crtc;
> +	conn = &priv->connector;
> +	KUNIT_ASSERT_TRUE(test, conn->display_info.is_hdmi);
> +
> +	mode = drm_kunit_display_mode_from_cea_vic(test, drm, 95);
> +	KUNIT_ASSERT_NOT_NULL(test, mode);
> +
> +	drm_modeset_acquire_init(&ctx, 0);
> +
> +	ret = drm_kunit_helper_enable_crtc_connector(test, drm,
> +						     crtc, conn,
> +						     mode, &ctx);
> +	KUNIT_ASSERT_EQ(test, ret, 0);

drm_kunit_helper_enable_crtc_connector() can return EDEADLK, so you need
to handle it and restart the sequence if it happens.

> +	state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx);
> +	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
> +
> +	conn_state = drm_atomic_get_connector_state(state, conn);
> +	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state);

Ditto.

> +	conn_state->hdmi.broadcast_rgb = broadcast_rgb;
> +
> +	ret = drm_atomic_check_only(state);
> +	KUNIT_ASSERT_EQ(test, ret, 0);
> +
> +	conn_state = drm_atomic_get_connector_state(state, conn);
> +	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state);

Ditto, but I'm not sure you need drm_atomic_get_connector_state() here.
We know at this point that the state is there and we don't need to
allocate it anymore. drm_atomic_get_new_connector_state() will probably
be enough, and that one can't return EDEADLK.

Maxime

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