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Wed, 15 Jul 2026 08:46:54 -0500 From: Wayne Lin To: CC: Harry Wentland , Leo Li , Aurabindo Pillai , Roman Li , Wayne Lin , Tom Chung , "Fangzhi Zuo" , Dan Wheeler , Ray Wu , Ivan Lipski , Alex Hung , James Lin , Chenyu Chen , Bhawanpreet Lakha Subject: [PATCH 33/70] drm/amd/display: add KUnit tests for DM stream scaling Date: Wed, 15 Jul 2026 21:37:43 +0800 Message-ID: <20260715134432.1975118-34-Wayne.Lin@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260715134432.1975118-1-Wayne.Lin@amd.com> References: <20260715134432.1975118-1-Wayne.Lin@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000FCBF:EE_|CH3PR12MB8211:EE_ X-MS-Office365-Filtering-Correlation-Id: 0135b5ad-df8f-4e41-9bcc-08dee2778b88 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|1800799024|23010399003|36860700016|82310400026|376014|13003099007|56012099006|11063799006|10067099003|18002099003|22082099003; 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DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: OqWjmS3xc3Xb7PNrd+wsfrkpnAENdCM07ntXLvJ4wnqqtwqMhlhhZX1ZY2Ey74wxZpQeunCV46dOMH0qgDa0vN3GOysPt3OQNsOCEboLFHPcC51dDuCc2ZF2qhFbcEaV222cG8exajQsbmC6Axq01KJKLnmajpD4QjZ0WeneArsHzT2M439WS8UScL0budUSOR3sqnhI+zoL4BJJ28287l1BkyEpyQvk/NjU8TgOToBkcT8qJ+roWRNDN5dSnC3+Lno+A4BR8Vvz6XP30DrgZPbUmGuryZJS83FCq4tFKUyQ8TVKcyKVvAjUnuxLCaMMGNflE2SKfglfrpH5PFQrDVsq4/bjsbwzrJmvuQMX4JnwwmRQckOWJC4KMXpq9zRI8OMtxQ/4vDZ4XwDBTcCTmW8gh8FzOjL2H8T5w3QTYPZPNz1/wiXqjhLdzK/UZ79i X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jul 2026 13:47:00.2288 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0135b5ad-df8f-4e41-9bcc-08dee2778b88 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000FCBF.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8211 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Alex Hung [WHAT] Add KUnit tests for the stream scaling path: a disable-underscan case for is_scaling_state_different, and coverage of amdgpu_dm_update_stream_scaling_settings across the full-screen default, RMX_FULL, RMX_ASPECT pillarbox/letterbox, RMX_CENTER and underscan paths. Assisted-by: Copilot:Claude-Opus-4.8 Reviewed-by: Bhawanpreet Lakha Signed-off-by: Alex Hung Signed-off-by: Wayne Lin --- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 + .../display/amdgpu_dm/tests/amdgpu_dm_test.c | 231 ++++++++++++++++++ 2 files changed, 232 insertions(+) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 7806b3405c3d..fc1a73435203 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -3456,6 +3456,7 @@ void amdgpu_dm_update_stream_scaling_settings(struct drm_device *dev, dst.x, dst.y, dst.width, dst.height); } +EXPORT_IF_KUNIT(amdgpu_dm_update_stream_scaling_settings); static int dm_update_mst_vcpi_slots_for_dsc(struct drm_atomic_state *state, struct dc_state *dc_state, diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_test.c b/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_test.c index 92056f4147d3..724d03db2736 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_test.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_test.c @@ -830,6 +830,28 @@ static void dm_test_scaling_state_underscan_enabled(struct kunit *test) KUNIT_EXPECT_TRUE(test, is_scaling_state_different(new_state, old_state)); } +/** + * dm_test_scaling_state_underscan_disabled - Test disabling underscan with borders differs + * @test: The KUnit test context + */ +static void dm_test_scaling_state_underscan_disabled(struct kunit *test) +{ + struct dm_connector_state *old_state; + struct dm_connector_state *new_state; + + old_state = kunit_kzalloc(test, sizeof(*old_state), GFP_KERNEL); + new_state = kunit_kzalloc(test, sizeof(*new_state), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, old_state); + KUNIT_ASSERT_NOT_NULL(test, new_state); + + old_state->underscan_enable = true; + old_state->underscan_hborder = 16; + old_state->underscan_vborder = 16; + new_state->underscan_enable = false; + + KUNIT_EXPECT_TRUE(test, is_scaling_state_different(new_state, old_state)); +} + /** * dm_test_scaling_state_underscan_border_changed - Test changed underscan borders differ * @test: The KUnit test context @@ -1203,6 +1225,206 @@ static void dm_test_master_stream_defaults_to_first(struct kunit *test) stream0); } +/* Tests for amdgpu_dm_update_stream_scaling_settings() */ + +/** + * dm_test_update_scaling_null_mode - Test NULL mode leaves the stream rects untouched + * @test: The KUnit test context + */ +static void dm_test_update_scaling_null_mode(struct kunit *test) +{ + struct amdgpu_device *adev = dm_kunit_alloc_adev(test); + struct dc_stream_state *stream = dm_kunit_alloc_stream(test, NULL); + + stream->timing.h_addressable = 1920; + stream->timing.v_addressable = 1080; + + amdgpu_dm_update_stream_scaling_settings(&adev->ddev, NULL, NULL, stream); + + /* NULL mode: early return before touching src/dst */ + KUNIT_EXPECT_EQ(test, stream->src.width, 0); + KUNIT_EXPECT_EQ(test, stream->dst.width, 0); +} + +/** + * dm_test_update_scaling_fullscreen_default - Test full-screen default with no dm_state + * @test: The KUnit test context + */ +static void dm_test_update_scaling_fullscreen_default(struct kunit *test) +{ + struct amdgpu_device *adev = dm_kunit_alloc_adev(test); + struct dc_stream_state *stream = dm_kunit_alloc_stream(test, NULL); + struct drm_display_mode mode = { 0 }; + + mode.hdisplay = 1920; + mode.vdisplay = 1080; + stream->timing.h_addressable = 2560; + stream->timing.v_addressable = 1440; + + amdgpu_dm_update_stream_scaling_settings(&adev->ddev, &mode, NULL, stream); + + /* src = mode, dst = timing addressable, no centering without dm_state */ + KUNIT_EXPECT_EQ(test, stream->src.width, 1920); + KUNIT_EXPECT_EQ(test, stream->src.height, 1080); + KUNIT_EXPECT_EQ(test, stream->dst.width, 2560); + KUNIT_EXPECT_EQ(test, stream->dst.height, 1440); + KUNIT_EXPECT_EQ(test, stream->dst.x, 0); + KUNIT_EXPECT_EQ(test, stream->dst.y, 0); +} + +/** + * dm_test_update_scaling_rmx_full - Test RMX_FULL keeps a full-size, centered dst + * @test: The KUnit test context + */ +static void dm_test_update_scaling_rmx_full(struct kunit *test) +{ + struct amdgpu_device *adev = dm_kunit_alloc_adev(test); + struct dc_stream_state *stream = dm_kunit_alloc_stream(test, NULL); + struct dm_connector_state *dm_state; + struct drm_display_mode mode = { 0 }; + + dm_state = kunit_kzalloc(test, sizeof(*dm_state), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, dm_state); + + mode.hdisplay = 1280; + mode.vdisplay = 720; + stream->timing.h_addressable = 1920; + stream->timing.v_addressable = 1080; + dm_state->scaling = RMX_FULL; + + amdgpu_dm_update_stream_scaling_settings(&adev->ddev, &mode, dm_state, stream); + + /* RMX_FULL: dst stays full addressable, offset 0 */ + KUNIT_EXPECT_EQ(test, stream->dst.width, 1920); + KUNIT_EXPECT_EQ(test, stream->dst.height, 1080); + KUNIT_EXPECT_EQ(test, stream->dst.x, 0); + KUNIT_EXPECT_EQ(test, stream->dst.y, 0); +} + +/** + * dm_test_update_scaling_rmx_aspect_pillarbox - Test RMX_ASPECT preserves aspect ratio + * @test: The KUnit test context + */ +static void dm_test_update_scaling_rmx_aspect_pillarbox(struct kunit *test) +{ + struct amdgpu_device *adev = dm_kunit_alloc_adev(test); + struct dc_stream_state *stream = dm_kunit_alloc_stream(test, NULL); + struct dm_connector_state *dm_state; + struct drm_display_mode mode = { 0 }; + + dm_state = kunit_kzalloc(test, sizeof(*dm_state), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, dm_state); + + /* 4:3 source on a 16:9 panel -> pillarboxed */ + mode.hdisplay = 1024; + mode.vdisplay = 768; + stream->timing.h_addressable = 1920; + stream->timing.v_addressable = 1080; + dm_state->scaling = RMX_ASPECT; + + amdgpu_dm_update_stream_scaling_settings(&adev->ddev, &mode, dm_state, stream); + + /* + * src.width*dst.height (1024*1080) < src.height*dst.width (768*1920): + * width scaled to src.width*dst.height/src.height = 1440, height stays + * 1080, centered horizontally at (1920-1440)/2 = 240. + */ + KUNIT_EXPECT_EQ(test, stream->dst.width, 1440); + KUNIT_EXPECT_EQ(test, stream->dst.height, 1080); + KUNIT_EXPECT_EQ(test, stream->dst.x, 240); + KUNIT_EXPECT_EQ(test, stream->dst.y, 0); +} + +/** + * dm_test_update_scaling_rmx_aspect_letterbox - Test RMX_ASPECT letterboxes wide sources + * @test: The KUnit test context + */ +static void dm_test_update_scaling_rmx_aspect_letterbox(struct kunit *test) +{ + struct amdgpu_device *adev = dm_kunit_alloc_adev(test); + struct dc_stream_state *stream = dm_kunit_alloc_stream(test, NULL); + struct dm_connector_state *dm_state; + struct drm_display_mode mode = { 0 }; + + dm_state = kunit_kzalloc(test, sizeof(*dm_state), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, dm_state); + + /* 16:9 source on a 4:3 panel -> letterboxed */ + mode.hdisplay = 1920; + mode.vdisplay = 1080; + stream->timing.h_addressable = 1024; + stream->timing.v_addressable = 768; + dm_state->scaling = RMX_ASPECT; + + amdgpu_dm_update_stream_scaling_settings(&adev->ddev, &mode, dm_state, stream); + + KUNIT_EXPECT_EQ(test, stream->dst.width, 1024); + KUNIT_EXPECT_EQ(test, stream->dst.height, 576); + KUNIT_EXPECT_EQ(test, stream->dst.x, 0); + KUNIT_EXPECT_EQ(test, stream->dst.y, 96); +} + +/** + * dm_test_update_scaling_rmx_center - Test RMX_CENTER centers a 1:1 dst + * @test: The KUnit test context + */ +static void dm_test_update_scaling_rmx_center(struct kunit *test) +{ + struct amdgpu_device *adev = dm_kunit_alloc_adev(test); + struct dc_stream_state *stream = dm_kunit_alloc_stream(test, NULL); + struct dm_connector_state *dm_state; + struct drm_display_mode mode = { 0 }; + + dm_state = kunit_kzalloc(test, sizeof(*dm_state), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, dm_state); + + mode.hdisplay = 1280; + mode.vdisplay = 720; + stream->timing.h_addressable = 1920; + stream->timing.v_addressable = 1080; + dm_state->scaling = RMX_CENTER; + + amdgpu_dm_update_stream_scaling_settings(&adev->ddev, &mode, dm_state, stream); + + /* RMX_CENTER: dst = src, centered on the addressable area */ + KUNIT_EXPECT_EQ(test, stream->dst.width, 1280); + KUNIT_EXPECT_EQ(test, stream->dst.height, 720); + KUNIT_EXPECT_EQ(test, stream->dst.x, 320); + KUNIT_EXPECT_EQ(test, stream->dst.y, 180); +} + +/** + * dm_test_update_scaling_underscan - Test underscan borders shrink and offset dst + * @test: The KUnit test context + */ +static void dm_test_update_scaling_underscan(struct kunit *test) +{ + struct amdgpu_device *adev = dm_kunit_alloc_adev(test); + struct dc_stream_state *stream = dm_kunit_alloc_stream(test, NULL); + struct dm_connector_state *dm_state; + struct drm_display_mode mode = { 0 }; + + dm_state = kunit_kzalloc(test, sizeof(*dm_state), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, dm_state); + + mode.hdisplay = 1920; + mode.vdisplay = 1080; + stream->timing.h_addressable = 1920; + stream->timing.v_addressable = 1080; + dm_state->scaling = RMX_FULL; + dm_state->underscan_enable = true; + dm_state->underscan_hborder = 64; + dm_state->underscan_vborder = 32; + + amdgpu_dm_update_stream_scaling_settings(&adev->ddev, &mode, dm_state, stream); + + /* Full dst, then underscan: x/y += border/2, width/height -= border */ + KUNIT_EXPECT_EQ(test, stream->dst.x, 32); + KUNIT_EXPECT_EQ(test, stream->dst.y, 16); + KUNIT_EXPECT_EQ(test, stream->dst.width, 1856); + KUNIT_EXPECT_EQ(test, stream->dst.height, 1048); +} + static struct kunit_case amdgpu_dm_tests[] = { /* Simple DM callbacks */ KUNIT_CASE(dm_test_is_idle), @@ -1254,6 +1476,7 @@ static struct kunit_case amdgpu_dm_tests[] = { KUNIT_CASE(dm_test_scaling_state_same), KUNIT_CASE(dm_test_scaling_state_scaling_changed), KUNIT_CASE(dm_test_scaling_state_underscan_enabled), + KUNIT_CASE(dm_test_scaling_state_underscan_disabled), KUNIT_CASE(dm_test_scaling_state_underscan_border_changed), /* is_timing_unchanged_for_freesync */ KUNIT_CASE(dm_test_timing_unchanged_null_args), @@ -1274,6 +1497,14 @@ static struct kunit_case amdgpu_dm_tests[] = { /* set_master_stream */ KUNIT_CASE(dm_test_master_stream_highest_refresh), KUNIT_CASE(dm_test_master_stream_defaults_to_first), + /* amdgpu_dm_update_stream_scaling_settings */ + KUNIT_CASE(dm_test_update_scaling_null_mode), + KUNIT_CASE(dm_test_update_scaling_fullscreen_default), + KUNIT_CASE(dm_test_update_scaling_rmx_full), + KUNIT_CASE(dm_test_update_scaling_rmx_aspect_pillarbox), + KUNIT_CASE(dm_test_update_scaling_rmx_aspect_letterbox), + KUNIT_CASE(dm_test_update_scaling_rmx_center), + KUNIT_CASE(dm_test_update_scaling_underscan), {} }; -- 2.43.0