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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=1769006884; 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=UpcmeBVOQexJFu2sQ5PWtzJkTq+8kHibYaVPiDsYg2+MkEoGMO5rhkANEtn8+zFT kVa7/I8P7NYo3Qm20JXLTJkuhBGIuqzGPCkw5pfTfc8Q261uqM7PUffegaKoE/Ony6O ZEOucfP9uLfTTBLgkTBFaKv9w2iuYf0SiRoWKLyw= Received: by mx.zohomail.com with SMTPS id 1769006882991361.2124863507353; Wed, 21 Jan 2026 06:48:02 -0800 (PST) From: Nicolas Frattaroli Date: Wed, 21 Jan 2026 15:45:26 +0100 Subject: [PATCH v7 19/22] 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: <20260121-color-format-v7-19-ef790dae780c@collabora.com> References: <20260121-color-format-v7-0-ef790dae780c@collabora.com> In-Reply-To: <20260121-color-format-v7-0-ef790dae780c@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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260121_064835_237448_57F9AA82 X-CRM114-Status: GOOD ( 15.94 ) 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. 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 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(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) { @@ -2700,11 +2717,103 @@ 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), { } }; -- 2.52.0