From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6538FFEFB7F for ; Fri, 27 Feb 2026 19:23:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Nt62OO2AP7f+cfOhlF2MV/RbDyVdkbuWQbRENaudCYk=; b=tqLO0xFMNQViUhSoYa7GzG/E7s YCLcPxlggQ6Q9NKzPfuk4U2XQiwMse7OqE1uHpH86fMvnT515k7l5v/mg/eIungiW4KicPThKmkZY 9NdL8vXQo4OVASp+POJqItWq8v1enJgABBrTPNmHGH5IaulGThYpO4QMlxDWsAYi8vMxIM0kGqanS gARoSTdMupDuXnT3JaBDqQWnRfgW3FhpTNYLAHChfB1YeFF3AHmb8ge6seyh0OUZ7V91yj4fMVc7G Q9P6ERiy3d2NmfuXPIOTZjvz11+S6xPCqZ3DsC2XtSeDlJeJ1YvS/BU4HCamultJD4CSGCRBlZmfo yvLEyroA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vw3Qo-00000008yYX-2q6A; Fri, 27 Feb 2026 19:23:22 +0000 Received: from sender4-pp-f112.zoho.com ([136.143.188.112]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vw3Qj-00000008ySK-1PpL; Fri, 27 Feb 2026 19:23:18 +0000 ARC-Seal: i=1; a=rsa-sha256; t=1772220164; cv=none; d=zohomail.com; s=zohoarc; b=ZAZ5ubKdwplGcIs94bYa3iSIapjedzG4WRtisO9/HQTRuPJAoeulytlGGHHvZNawUIF0T0SGTv3cmGjUTAwEI9ktL2jkG7FdpdakwoN85Z+C1ULdD64qn3f41FaHJhjydxMPfxFocbbUIIletaTnyHf06GKh0V1DQGlkWHPwyjw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1772220164; 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=Nt62OO2AP7f+cfOhlF2MV/RbDyVdkbuWQbRENaudCYk=; b=M6WzKACGBK+A+vavwnlHxjscuYrSCaY+BoX1nF9xrNHXxTvab//vxLvdSBWDAipjq1CETl49Pfq4trMcmmAtHcujSz29m6Rw77asG3RYwSKYqD9S7zcznEDAJJoTPeb2XL65GAm4YiZCHzQ2uS57SYQxwM82t8WTqc/506GOhyU= 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=1772220164; 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=Nt62OO2AP7f+cfOhlF2MV/RbDyVdkbuWQbRENaudCYk=; b=Bc0K/pB7A8rqX04gfbgPVpzjGw79lZ4Dl6IvqxPqQXgMOkHfVIChwAeuscyjtq8T apkRPel0iBroY/sNWDPzmqVFSUvrex0Z1wcE57PPSJeIepLa3voHH5UZ6yFqVeyb6Dv Q0PlGt/s3AWk+bip+VTgFf/gNwgpScNwfuM8hdK4= Received: by mx.zohomail.com with SMTPS id 1772220162744578.6872632752585; Fri, 27 Feb 2026 11:22:42 -0800 (PST) From: Nicolas Frattaroli Date: Fri, 27 Feb 2026 20:20:22 +0100 Subject: [PATCH v9 17/19] drm/tests: hdmi: Add tests for HDMI helper's mode_valid MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260227-color-format-v9-17-658c3b9db7ef@collabora.com> References: <20260227-color-format-v9-0-658c3b9db7ef@collabora.com> In-Reply-To: <20260227-color-format-v9-0-658c3b9db7ef@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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260227_112317_407488_470751AB X-CRM114-Status: GOOD ( 15.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 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 3444c93c615f..74c9933eabfc 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), { } }; -- 2.53.0