From nobody Mon Feb 9 12:25:11 2026 Received: from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com [136.143.188.112]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5006149550C; Wed, 21 Jan 2026 13:49:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.112 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769003349; cv=pass; b=Esw05pnFG+TrcqTCPdElZOueiQCH4l/UD7yEc+qrx9iPc2FRcswCNEKx7k89MX1kzj52KdaypzLLxm6k+pl/8FE9JeUL+pz2uUhWJifINeomcGSk4dvZzOZY44PDEHd/kY/QCdUyTGUlRbUJCwc+Yt3Gi90PAFaFDmjdYnGOSV8= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769003349; c=relaxed/simple; bh=r8SWjNbBhIXOPdxDTFIcwdoV73mX32r+LTkqTuJACz0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=jBZuTkoK/L0SoolXh2F55yGUrRlVng/2b/2/uGiQx+/TXuvagDIcQlgioNKuGpyzOiVt/69GkoXjIU0eJELektmhrAcCfDzNOLQfV9MnbRNizBREH/+kTYXVOhy3wPuD5wdepNTIuVGdOhw0qx45ekZs1g/wKm8cMgIT17vHfxQ= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (1024-bit key) header.d=collabora.com header.i=nicolas.frattaroli@collabora.com header.b=HHseh6MX; arc=pass smtp.client-ip=136.143.188.112 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=collabora.com header.i=nicolas.frattaroli@collabora.com header.b="HHseh6MX" ARC-Seal: i=1; a=rsa-sha256; t=1769003307; cv=none; d=zohomail.com; s=zohoarc; b=ARvJ1uwWpvMQ4frAs+b1t7+FVlXNeYOqtpz5gkhqq8nUOkhKtXMajZMSRnLegeKmxV5007Be9eTSwcJo7gnxxV5Er8IscDK6aCPA+OA95lKgezaIb3e7JafaNXStRnXM+PgbLXV0Wn4XlF6C0+N9B+BgX56TeduDa6lEzyrLzBw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1769003307; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To; bh=ps4BnNAGF4U24DnSoeoMdVWWIbGEhgg92/5V7kamsSY=; b=fBBYcV4FmzFQ5EUFjTq5tpprZMGu6vTXVpTmKFOfh2eC7eM6zGbQEOJVKkrcTtZT94CgHzmV+7sO4c1vmBPnMy8hKHvzJvXER/8BKxkpntyNG2GfXX3xsxPa8L0co+Oaigv6qq0HTgIV0/RQtN0lLQWNykFDVajoEZkFpYw03oE= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=nicolas.frattaroli@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1769003307; s=zohomail; d=collabora.com; i=nicolas.frattaroli@collabora.com; h=From:From:Date:Date:Subject:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Message-Id:References:In-Reply-To:To:To:Cc:Cc:Reply-To; bh=ps4BnNAGF4U24DnSoeoMdVWWIbGEhgg92/5V7kamsSY=; b=HHseh6MXaXmkXHYYWhMMmvqzudl5sVn+PJcpdUS8YrQZVXKDLb66ExldprGXEx3W m5o7znX+kQARlIby9oZmcBvN6noJRWNDUcjtvRw8JDTOjbl9yv6iFWWmKPIO3c4qohV gbL7z7Ubrk3JW7JcQyhO+EAiRgM1SkaTMa3ADXeE= Received: by mx.zohomail.com with SMTPS id 1769003304993745.5600624955455; Wed, 21 Jan 2026 05:48:24 -0800 (PST) From: Nicolas Frattaroli Date: Wed, 21 Jan 2026 14:45:45 +0100 Subject: [PATCH v6 19/21] drm/tests: hdmi: Add tests for HDMI helper's mode_valid Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260121-color-format-v6-19-7b81a771cd0b@collabora.com> References: <20260121-color-format-v6-0-7b81a771cd0b@collabora.com> In-Reply-To: <20260121-color-format-v6-0-7b81a771cd0b@collabora.com> To: Harry Wentland , Leo Li , Rodrigo Siqueira , Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Dmitry Baryshkov , Sascha Hauer , Rob Herring , Jonathan Corbet Cc: kernel@collabora.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-doc@vger.kernel.org, Nicolas Frattaroli X-Mailer: b4 0.14.3 Add some KUnit tests to verify that the HDMI state helper's mode_valid implementation does not improperly reject chroma subsampled modes on the basis of their clock rate not being satisfiable in RGB. Signed-off-by: Nicolas Frattaroli --- drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 109 +++++++++++++++++= ++++ 1 file changed, 109 insertions(+) diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/g= pu/drm/tests/drm_hdmi_state_helper_test.c index f9648f9de46b..b2c421d7e986 100644 --- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c +++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c @@ -77,6 +77,23 @@ static struct drm_display_mode *find_420_only_mode(struc= t drm_connector *connect return NULL; } =20 +static struct drm_display_mode *find_420_also_mode(struct drm_connector *c= onnector) +{ + struct drm_device *drm =3D connector->dev; + struct drm_display_mode *mode; + + mutex_lock(&drm->mode_config.mutex); + list_for_each_entry(mode, &connector->modes, head) { + if (drm_mode_is_420_also(&connector->display_info, mode)) { + mutex_unlock(&drm->mode_config.mutex); + return mode; + } + } + mutex_unlock(&drm->mode_config.mutex); + + return NULL; +} + static int set_connector_edid(struct kunit *test, struct drm_connector *co= nnector, const void *edid, size_t edid_len) { @@ -2700,11 +2717,103 @@ static void drm_test_check_mode_valid_reject_max_c= lock(struct kunit *test) KUNIT_EXPECT_EQ(test, preferred->clock, 25200); } =20 +/* + * Test that drm_hdmi_connector_mode_valid() will accept modes that requir= e a + * 4:2:0 chroma subsampling, even if said mode would violate maximum clock + * constraints if it used RGB 4:4:4. + */ +static void drm_test_check_mode_valid_yuv420_only_max_clock(struct kunit *= test) +{ + struct drm_atomic_helper_connector_hdmi_priv *priv; + struct drm_display_mode *dank; + struct drm_connector *conn; + + priv =3D drm_kunit_helper_connector_hdmi_init_with_edid_funcs(test, + BIT(HDMI_COLORSPACE_RGB) | + BIT(HDMI_COLORSPACE_YUV420), + 8, + &dummy_connector_hdmi_funcs, + test_edid_hdmi_1080p_rgb_yuv_4k_yuv420_dc_max_200mhz); + KUNIT_ASSERT_NOT_NULL(test, priv); + + conn =3D &priv->connector; + KUNIT_ASSERT_EQ(test, conn->display_info.max_tmds_clock, 200 * 1000); + + dank =3D find_420_only_mode(conn); + KUNIT_ASSERT_NOT_NULL(test, dank); + KUNIT_EXPECT_EQ(test, dank->hdisplay, 3840); + KUNIT_EXPECT_EQ(test, dank->vdisplay, 2160); + + /* + * Note: The mode's "clock" here is not accurate to the actual TMDS + * clock that HDMI will use for a subsampled mode. Hence, why the mode's + * clock is above the .max_tmds_clock of 200MHz. + */ + KUNIT_EXPECT_EQ(test, dank->clock, 297000); +} + +/* + * Test that drm_hdmi_connector_mode_valid() will reject modes that require + * 4:2:0 chroma subsampling, if the connector does not support 4:2:0. + */ +static void +drm_test_check_mode_valid_reject_yuv420_only_connector(struct kunit *test) +{ + struct drm_atomic_helper_connector_hdmi_priv *priv; + struct drm_display_mode *dank; + struct drm_connector *conn; + + priv =3D drm_kunit_helper_connector_hdmi_init_with_edid_funcs(test, + BIT(HDMI_COLORSPACE_RGB), + 8, + &dummy_connector_hdmi_funcs, + test_edid_hdmi_1080p_rgb_yuv_4k_yuv420_dc_max_200mhz); + KUNIT_ASSERT_NOT_NULL(test, priv); + + conn =3D &priv->connector; + KUNIT_ASSERT_EQ(test, conn->display_info.max_tmds_clock, 200 * 1000); + + dank =3D find_420_only_mode(conn); + KUNIT_EXPECT_NULL(test, dank); +} + +/* + * Test that drm_hdmi_connector_mode_valid() will accept modes that allow = (among + * other color formats) 4:2:0 chroma subsampling, even if the connector do= es not + * support 4:2:0, but the mode's clock works for RGB 4:4:4. + */ +static void +drm_test_check_mode_valid_accept_yuv420_also_connector_rgb(struct kunit *t= est) +{ + struct drm_atomic_helper_connector_hdmi_priv *priv; + struct drm_display_mode *mode; + struct drm_connector *conn; + + priv =3D drm_kunit_helper_connector_hdmi_init_with_edid_funcs(test, + BIT(HDMI_COLORSPACE_RGB), + 8, + &dummy_connector_hdmi_funcs, + test_edid_hdmi_4k_rgb_yuv420_dc_max_340mhz); + KUNIT_ASSERT_NOT_NULL(test, priv); + + conn =3D &priv->connector; + KUNIT_ASSERT_EQ(test, conn->display_info.max_tmds_clock, 340 * 1000); + + mode =3D find_420_also_mode(conn); + KUNIT_ASSERT_NOT_NULL(test, mode); + KUNIT_EXPECT_EQ(test, mode->hdisplay, 3840); + KUNIT_EXPECT_EQ(test, mode->vdisplay, 2160); + KUNIT_EXPECT_EQ(test, mode->clock, 297000); +} + static struct kunit_case drm_atomic_helper_connector_hdmi_mode_valid_tests= [] =3D { KUNIT_CASE(drm_test_check_mode_valid), KUNIT_CASE(drm_test_check_mode_valid_reject), KUNIT_CASE(drm_test_check_mode_valid_reject_rate), KUNIT_CASE(drm_test_check_mode_valid_reject_max_clock), + KUNIT_CASE(drm_test_check_mode_valid_yuv420_only_max_clock), + KUNIT_CASE(drm_test_check_mode_valid_reject_yuv420_only_connector), + KUNIT_CASE(drm_test_check_mode_valid_accept_yuv420_also_connector_rgb), { } }; =20 --=20 2.52.0