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[36.229.237.19]) by smtp.gmail.com with ESMTPSA id x27sm394824pfr.122.2021.01.12.17.41.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Jan 2021 17:41:11 -0800 (PST) From: Koba Ko To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Lyude Paul , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] drm/dp_mst: Align mst link rate with soure rate Date: Wed, 13 Jan 2021 09:41:05 +0800 Message-Id: <20210113014105.28110-2-koba.ko@canonical.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210113014105.28110-1-koba.ko@canonical.com> References: <20210113014105.28110-1-koba.ko@canonical.com> MIME-Version: 1.0 X-Mailman-Approved-At: Wed, 13 Jan 2021 08:21:20 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" After read the link rate from MST hub, align with maximum source rate. Signed-off-by: Koba Ko --- drivers/gpu/drm/drm_dp_mst_topology.c | 8 ++++++++ drivers/gpu/drm/i915/display/intel_dp.c | 7 +++++++ include/drm/drm_dp_helper.h | 8 ++++++++ include/drm/drm_dp_mst_helper.h | 4 ++++ 4 files changed, 27 insertions(+) diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 6982ecbf30b5..e7ceae97be85 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -3672,6 +3672,10 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms { int ret = 0; struct drm_dp_mst_branch *mstb = NULL; + unsigned int max_link_rate_tbl[MAX_DRM_DP_MAX_RATE + 1] = { + DP_LINK_BW_1_62, DP_LINK_BW_2_7, DP_LINK_BW_5_4, + DP_LINK_BW_8_1, DP_LINK_RATE_TABLE + }; mutex_lock(&mgr->payload_lock); mutex_lock(&mgr->lock); @@ -3693,6 +3697,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms goto out_unlock; } + if (mgr->max_source_rate < MAX_DRM_DP_MAX_RATE) + mgr->dpcd[1] = max_link_rate_tbl[mgr->max_source_rate]; + mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr->dpcd[1], mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK); if (mgr->pbn_div == 0) { @@ -5422,6 +5429,7 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, mgr->aux = aux; mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; mgr->max_payloads = max_payloads; + mgr->max_source_rate = MAX_DRM_DP_MAX_RATE; mgr->conn_base_id = conn_base_id; if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 || max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 469e765a1b7b..a89b4c823123 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -5392,6 +5392,13 @@ intel_dp_configure_mst(struct intel_dp *intel_dp) intel_dp->is_mst = sink_can_mst && i915->params.enable_dp_mst; + if (intel_dp_source_supports_hbr3(intel_dp)) + intel_dp->mst_mgr.max_source_rate = DRM_DP_MAX_RATE_HBR3; + else if (intel_dp_source_supports_hbr2(intel_dp)) + intel_dp->mst_mgr.max_source_rate = DRM_DP_MAX_RATE_HBR2; + else + intel_dp->mst_mgr.max_source_rate = DRM_DP_MAX_RATE_HBR; + drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst); } diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 6236f212da61..ef2b328469cd 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -183,6 +183,14 @@ struct drm_device; #define DP_SUPPORTED_LINK_RATES 0x010 /* eDP 1.4 */ # define DP_MAX_SUPPORTED_RATES 8 /* 16-bit little-endian */ +enum drm_dp_max_link_rate { + DRM_DP_MAX_RATE_RBR = 0, + DRM_DP_MAX_RATE_HBR, + DRM_DP_MAX_RATE_HBR2, + DRM_DP_MAX_RATE_HBR3, + MAX_DRM_DP_MAX_RATE +}; + /* Multiple stream transport */ #define DP_FAUX_CAP 0x020 /* 1.2 */ # define DP_FAUX_CAP_1 (1 << 0) diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h index f5e92fe9151c..e7d8c899fea0 100644 --- a/include/drm/drm_dp_mst_helper.h +++ b/include/drm/drm_dp_mst_helper.h @@ -593,6 +593,10 @@ struct drm_dp_mst_topology_mgr { * @max_payloads: maximum number of payloads the GPU can generate. */ int max_payloads; + /** + * @max_source_rate: maximum link rate of source. + */ + int max_source_rate; /** * @conn_base_id: DRM connector ID this mgr is connected to. Only used * to build the MST connector path value.