From mboxrd@z Thu Jan 1 00:00:00 1970 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 2208A41C2FE; Tue, 9 Jun 2026 12:48:09 +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=1781009290; cv=pass; b=Wtj9yg48VKmKCwokxUGVAmh1mpD5lyTDCmaSoGbbMDD0Iv1pXY9fVzySCXDBGfDhMnqQgUZ9n2aXmGhpqGpjczFE9y+rND2diWKpCblD2SrzjPc1AM4p4Kgu8XmPecD4/SuIPuX9WzC2TW7W1h1LCFbxKWj4Gu9KoENldTv6YD8= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781009290; c=relaxed/simple; bh=iRheOrWlMoQbFU2qwh3dx9D2lcm0rWaYx9PKcCVwKd0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Pbp9TM4+6Wrkt0ZOlzXv0SeEA5tl5rgdQdx4fcx++s3WRK87Zj4L3ORbtznmmqcZN8DGR6WFrVaSm3wgcthAX+Nh+6yKkrk5nuV2viPaoqFI7+GVGiIWF0pm9mmGzcDvxUAW/FVsz952F2vR2Y7OJbtlApa8psFZbvQn2oHintI= 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=KmYUark3; 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="KmYUark3" ARC-Seal: i=1; a=rsa-sha256; t=1781009248; cv=none; d=zohomail.com; s=zohoarc; b=FTsl62LoKZwEuSzB2aJR4oLwySw4Vi6xyz4givSbizFve7CXBa+Gpe29zmh+PdrLDQPbxCXDb42wt2uwpAbJ+YLnB/8eiipP8H98sS8BM+p+GXX88bUqw3qCJloZpXR75bc/VVWQprlnVb4wW7he0I57vDGmp6kxHReClrtMzeU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1781009248; 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=VjTLCJ4yrFpx91pOX4QxBiEfIYd1n6wewiyNVeWJ+PE=; b=VH7CSu+SQujHf7g9jKZZqr2E6Qn+QpAN7e/qIxzqrMCblcKttyDTQj/bhJMO/DTLIO25Auwbvqk5rx0IEU4iCPr8QBE8U1L4Wp3esHVz0zSxqXDHTmKarb9wFAuE+A3FyvwBmyqs9bzSVBQtd/IphJfugkyEzBYyernent1M7yc= 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=1781009248; 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=VjTLCJ4yrFpx91pOX4QxBiEfIYd1n6wewiyNVeWJ+PE=; b=KmYUark3uXJIpVHvry5F78Apg3ATZJMfmZr5tIxHFnaAf/xzDhjl0BLGKJ2tKC3g kTPK4VBUYFRGcFUkevvLOTK97xectof1Hrar0rKii3ytEyniAhwGTsnaGEEGSqywPN7 L5vkPLe2+6UoP+I0uxq4ybkkHKG7x/i+8NiphyEE= Received: by mx.zohomail.com with SMTPS id 178100924570730.244177959776266; Tue, 9 Jun 2026 05:47:25 -0700 (PDT) From: Nicolas Frattaroli Date: Tue, 09 Jun 2026 14:44:07 +0200 Subject: [PATCH v17 20/28] 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: 7bit Message-Id: <20260609-color-format-v17-20-35739b5782cc@collabora.com> References: <20260609-color-format-v17-0-35739b5782cc@collabora.com> In-Reply-To: <20260609-color-format-v17-0-35739b5782cc@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 , Shuah Khan , Daniel Stone 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, wayland-devel@lists.freedesktop.org, Nicolas Frattaroli X-Mailer: b4 0.15.2 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. Reviewed-by: Maxime Ripard Reviewed-by: Daniel Stone 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/gpu/drm/tests/drm_hdmi_state_helper_test.c index 8eaca9b5b0fe..353a261d42da 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(struct drm_connector *connect return NULL; } +static struct drm_display_mode *find_420_also_mode(struct drm_connector *connector) +{ + struct drm_device *drm = 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 *connector, const void *edid, size_t edid_len) { @@ -2745,11 +2762,103 @@ static void drm_test_check_mode_valid_reject_max_clock(struct kunit *test) KUNIT_EXPECT_EQ(test, preferred->clock, 25200); } +/* + * Test that drm_hdmi_connector_mode_valid() will accept modes that require 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 = 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 = &priv->connector; + KUNIT_ASSERT_EQ(test, conn->display_info.max_tmds_clock, 200 * 1000); + + dank = 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 = 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 = &priv->connector; + KUNIT_ASSERT_EQ(test, conn->display_info.max_tmds_clock, 200 * 1000); + + dank = 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 does 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 *test) +{ + struct drm_atomic_helper_connector_hdmi_priv *priv; + struct drm_display_mode *mode; + struct drm_connector *conn; + + priv = 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 = &priv->connector; + KUNIT_ASSERT_EQ(test, conn->display_info.max_tmds_clock, 340 * 1000); + + mode = 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[] = { 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), { } }; -- 2.54.0