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Tue, 25 Feb 2025 00:36:45 -0600 From: Wayne Lin To: CC: Harry Wentland , Leo Li , Aurabindo Pillai , Roman Li , Wayne Lin , Tom Chung , "Fangzhi Zuo" , Zaeem Mohamed , Solomon Chiu , Daniel Wheeler , Alex Hung , Hansen Dsouza , Charlene Liu Subject: [PATCH 04/27] drm/amd/display: read mso dpcd caps Date: Tue, 25 Feb 2025 14:35:47 +0800 Message-ID: <20250225063610.631461-5-Wayne.Lin@amd.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20250225063610.631461-1-Wayne.Lin@amd.com> References: <20250225063610.631461-1-Wayne.Lin@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Received-SPF: None (SATLEXMB04.amd.com: Wayne.Lin@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF0000468E:EE_|SA1PR12MB9247:EE_ X-MS-Office365-Filtering-Correlation-Id: 8746e262-2258-42f0-9bd0-08dd5566c920 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(1800799024)(376014)(82310400026)(36860700013); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Feb 2025 06:36:50.5392 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8746e262-2258-42f0-9bd0-08dd5566c920 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF0000468E.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB9247 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: Hansen Dsouza [Why & How] Read if panel support multi-sst links Reviewed-by: Charlene Liu Signed-off-by: Hansen Dsouza Signed-off-by: Wayne Lin --- drivers/gpu/drm/amd/display/dc/dc_dp_types.h | 2 ++ .../display/dc/link/protocols/link_dp_capability.c | 11 +++++++++++ 2 files changed, 13 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h index 8bb628ab7855..22c2173c687f 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h @@ -1220,6 +1220,8 @@ struct dpcd_caps { struct replay_info pr_info; uint16_t edp_oled_emission_rate; union dp_receive_port0_cap receive_port0_cap; + /* Indicates the number of SST links supported by MSO (Multi-Stream Output) */ + uint8_t mso_cap_sst_links_supported; }; union dpcd_sink_ext_caps { diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c index 0785c030f6a6..da19f6a3b42b 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c @@ -2100,6 +2100,17 @@ void detect_edp_sink_caps(struct dc_link *link) core_link_read_dpcd(link, DP_SINK_EMISSION_RATE, (uint8_t *)&link->dpcd_caps.edp_oled_emission_rate, sizeof(link->dpcd_caps.edp_oled_emission_rate)); + + /* + * Read Multi-SST (Single Stream Transport) capability + * for eDP version 1.4 or higher. + */ + if (link->dpcd_caps.dpcd_rev.raw >= DP_EDP_14) + core_link_read_dpcd( + link, + DP_EDP_MSO_LINK_CAPABILITIES, + (uint8_t *)&link->dpcd_caps.mso_cap_sst_links_supported, + sizeof(link->dpcd_caps.mso_cap_sst_links_supported)); } bool dp_get_max_link_enc_cap(const struct dc_link *link, struct dc_link_settings *max_link_enc_cap) -- 2.37.3