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Thu, 9 Oct 2025 17:26:42 +0000 Message-ID: Date: Thu, 9 Oct 2025 13:26:39 -0400 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/23] Analog connector support in DC (v2) From: Harry Wentland To: =?UTF-8?Q?Timur_Krist=C3=B3f?= , amd-gfx@lists.freedesktop.org, Daniel Wheeler Cc: alexander.deucher@amd.com, alex.hung@amd.com, siqueira@igalia.com, christian.koenig@amd.com References: <20250926180203.16690-1-timur.kristof@gmail.com> <0fb9b183-ba74-4837-86a1-499b3acf04d5@amd.com> Content-Language: en-US In-Reply-To: <0fb9b183-ba74-4837-86a1-499b3acf04d5@amd.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MN0PR04CA0024.namprd04.prod.outlook.com (2603:10b6:208:52d::14) To CO6PR12MB5427.namprd12.prod.outlook.com (2603:10b6:5:358::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR12MB5427:EE_|SJ0PR12MB6759:EE_ X-MS-Office365-Filtering-Correlation-Id: b9d68abf-1db5-48ea-3d7a-08de0759033a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; 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GPUs that already use DC by default and have analog connectors. >> Some Tonga and Hawaii graphics cards in fact have DVI-I connectors, >> and their analog part doesn't work with DC. This functionality >> regressed when switching from the amdgpu legacy display code to DC. >> >> 2. GPUs that don't use amdgpu by default yet. >> Currently, SI (GFX6) and CIK (GFX7) don't use amdgpu by default >> yet, and missing analog connector support in DC is cited as one >> of the main reasons why not. >> >> Before starting this work, I asked Harry and Alex about how best >> to do it and we agreed that we'd like to use the VBIOS to set up >> the DAC. So I used the amdgpu legacy display code as a reference. >> The first few commits add some minor changes to DC to prepare for >> supporting analog stream and link encoders, then analog link >> detection is added along with polling, and finally DAC load >> detection support, which is useful for old displays and adapters. >> >> With this analog support added to DC, we could already fully switch >> CIK discrete GPUs to use DC and switch them to the amdgpu driver >> by default. This series switches Bonaire to DC by default, we >> can do the switch to amdgpu in a later series. >> >> For SI dGPUs, there are other pending patches to make DC work >> well, afterwards we could switch to DC by default, but missing >> VCE1 support is the blocker from using amdgpu by default. >> >> For GFX7 APUs, further work is needed before enabling DC by >> default, specifically with regards to the TRAVIS and NUTMEG >> external encoders which are not supported by DC at all. >> >> Changes in v2 of the series: >> Fixed regression on RDNA2 and newer APUs. >> Fixed flickering caused by polling analog connectors. >> Fixed crash on Kaveri. >> Fixed bug when HPD was high without a connected display. >> Reduced code churn by reusing same link encoder. >> Addressed other feedback from the review of v1. > > Thanks for the series. > > Patches 1-13 are > Reviewed-by: Harry Wentland > > I'll hope to find time for the rest tomorrow or Friday. > The rest looks good to me as well. The whole series is Reviewed-by: Harry Wentland Dan, can we give this a spin in our weekly promotion tests before I merge it? Harry > Harry > >> >> Timur Kristóf (23): >> drm/amd/display: Determine DVI-I connector type (v2) >> drm/amd/display: Add analog bit to edid_caps (v2) >> drm/amd/display: Introduce MAX_LINK_ENCODERS (v2) >> drm/amd/display: Hook up DAC to bios_parser_encoder_control >> drm/amd/display: Add SelectCRTC_Source to BIOS parser >> drm/amd/display: Get maximum pixel clock from VBIOS >> drm/amd/display: Don't use stereo sync and audio on RGB signals (v2) >> drm/amd/display: Don't try to enable/disable HPD when unavailable >> drm/amd/display: Determine early if a link has supported encoders (v2) >> drm/amd/display: Add concept of analog encoders (v2) >> drm/amd/display: Implement DCE analog stream encoders >> drm/amd/display: Implement DCE analog link encoders (v2) >> drm/amd/display: Support DAC in dce110_hwseq >> drm/amd/display: Add analog link detection (v2) >> drm/amd/display: Refactor amdgpu_dm_connector_detect (v2) >> drm/amd/display: Poll analog connectors (v2) >> drm/amd/display: Add DCE BIOS_SCRATCH_0 register >> drm/amd/display: Make get_support_mask_for_device_id reusable >> drm/amd/display: Add DAC_LoadDetection to BIOS parser (v2) >> drm/amd/display: Use DAC load detection on analog connectors (v2) >> drm/amd/display: Add common modes to analog displays without EDID >> drm/amd/display: Don't add freesync modes to analog displays (v2) >> drm/amdgpu: Use DC by default for Bonaire >> >> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 - >> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 173 ++++++++--- >> .../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 5 +- >> .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 1 + >> .../drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c | 20 ++ >> .../gpu/drm/amd/display/dc/bios/bios_parser.c | 95 +++++- >> .../drm/amd/display/dc/bios/command_table.c | 286 ++++++++++++++++++ >> .../drm/amd/display/dc/bios/command_table.h | 6 + >> .../drm/amd/display/dc/core/dc_link_enc_cfg.c | 4 +- >> .../gpu/drm/amd/display/dc/core/dc_resource.c | 8 + >> .../gpu/drm/amd/display/dc/dc_bios_types.h | 9 + >> drivers/gpu/drm/amd/display/dc/dc_types.h | 8 +- >> .../drm/amd/display/dc/dce/dce_link_encoder.c | 85 ++++++ >> .../drm/amd/display/dc/dce/dce_link_encoder.h | 16 +- >> .../amd/display/dc/dce/dce_stream_encoder.c | 14 + >> .../amd/display/dc/dce/dce_stream_encoder.h | 5 + >> .../amd/display/dc/hwss/dce110/dce110_hwseq.c | 75 ++++- >> .../gpu/drm/amd/display/dc/inc/core_types.h | 8 +- >> .../gpu/drm/amd/display/dc/inc/hw/hw_shared.h | 24 ++ >> .../drm/amd/display/dc/inc/hw/link_encoder.h | 2 + >> drivers/gpu/drm/amd/display/dc/inc/resource.h | 1 + >> .../amd/display/dc/link/hwss/link_hwss_dio.c | 19 +- >> .../drm/amd/display/dc/link/link_detection.c | 147 ++++++++- >> .../gpu/drm/amd/display/dc/link/link_dpms.c | 9 +- >> .../drm/amd/display/dc/link/link_factory.c | 60 +++- >> .../dc/resource/dce100/dce100_resource.c | 31 +- >> .../dc/resource/dce110/dce110_resource.c | 2 + >> .../dc/resource/dce112/dce112_resource.c | 2 + >> .../dc/resource/dce120/dce120_resource.c | 1 + >> .../dc/resource/dce60/dce60_resource.c | 29 +- >> .../dc/resource/dce80/dce80_resource.c | 26 +- >> .../amd/display/include/bios_parser_types.h | 11 +- >> .../display/include/grph_object_ctrl_defs.h | 1 + >> .../drm/amd/display/include/grph_object_id.h | 7 + >> .../drm/amd/display/include/signal_types.h | 12 + >> 35 files changed, 1117 insertions(+), 86 deletions(-) >> >