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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2db1497d455sm56667045ad.30.2026.09.08.02.13.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Sep 2026 02:13:17 -0700 (PDT) Message-ID: <3541a607-0699-4028-8a06-70a5acbdd2b7@oss.qualcomm.com> Date: Tue, 8 Sep 2026 17:13:07 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/5] drm/msm/dp: Add MSM Type-C MST support To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , Tomi Valkeinen , Bjorn Andersson , Konrad Dybcio Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org References: <20260629-msm-dp-msttypec-v1-0-646a10256233@oss.qualcomm.com> Content-Language: en-US From: Yongxing Mou In-Reply-To: <20260629-msm-dp-msttypec-v1-0-646a10256233@oss.qualcomm.com> X-Authority-Analysis: v=2.4 cv=TqLWQjXh c=1 sm=1 tr=0 ts=6a9fd1af cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=e5mUnYsNAAAA:8 a=daqqUZpfhLtBxDMUUs8A:9 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 a=Vxmtnl_E_bksehYqCbjh:22 X-Proofpoint-GUID: QerBCo-PGHhzsweVzsO38vKHUohQYggg X-Proofpoint-ORIG-GUID: QerBCo-PGHhzsweVzsO38vKHUohQYggg X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA4MDA5NiBTYWx0ZWRfXwV5wYciUOlti nSCcA+EVwbfzG7Jb7MHqahcf2qAQLIHlqmW1THLqQbKYsPy/1MzGam4FUD2FHXgZGQUcfDf8aby Z+URWq0q5mmP1haQ4TiBN2c9Bm9goto= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA4MDA5NiBTYWx0ZWRfX9UmtpOTA3oZc MgkWVrCXqdP/IFju7EBgQyAXXjuMJW5RZMCTInnoGQqIHWcF2T9rjA4bllirBpfErHYHvur3UuG baj9juwGyJF+k+iyKd9T4zilgzFRJ9LOCMhWAlqzquWbMK5LmR5vkz6bgf+wpcnLeb/detHWkP8 WMPNyKnWtVwBiIAjuE8CxdLwVKINGhsqer4ECjQNLqiBx/Jxx4x8I+uSYLEfVahZqGkVOBHvqcI C4+/42hwcBuzZ95FVoE1S4TTSUhkwO5iB7MclwaHriv6dZ7zCMFoQytdvSErIqV5p/x01p3Z0d3 +q1DlgyXnh4Iv8PpcfBbTXGuDuAFRA5mdAVWtFp17Pm6Vrj5IvF21xxmxCyHoA906y6bqL99BNG kaZXS00qzmmD5wtaelAmhJsl2HrAZQg+ucCsAaNW2QXAYlLXwUX13gSbFfFHQ2K+G1cT9JN7vUx NzN7elVVQpKa6yCYmQA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-08_01,2026-09-07_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 adultscore=0 bulkscore=0 lowpriorityscore=0 spamscore=0 phishscore=0 malwarescore=0 clxscore=1015 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609080096 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260908_021321_254599_B025EEF5 X-CRM114-Status: GOOD ( 20.64 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On 6/29/2026 10:48 PM, Yongxing Mou wrote: > The bridge connector framework currently treats every HPD notification > as a connector state update and emits a userspace hotplug event. > Once MST is enabled, however, connector creation, removal and hotplug > handling are already managed by the DRM DP MST topology manager. > > As a result: > > - the SST connector may transiently transition between connected and > disconnected during MST initialization > > - MST IRQ notifications may generate duplicate userspace hotplug > events, once from the bridge connector layer and once from the MST > topology manager > > Introduce explicit support for IRQ-only HPD notifications in the bridge > connector framework and allow bridge drivers to suppress connector > hotplug events when those events are already handled elsewhere. > > MSM DP uses these mechanisms to integrate Type-C MST hubs without > generating duplicate or spurious userspace hotplug notifications. > > Testing > ------- > Tested on Hamoa-EVK with a Type-C MST hub and dual-monitor setup. > Both fbcon and Weston were exercised. No duplicate hotplug events, > connector state oscillation or display flickering were observed after > hub attachment. > > Dependencies > ------------ > This patch series was made on top of: > > [1] drm: handle IRQ_HPD events correctly (v4) > https://lore.kernel.org/r/20260608-hpd-irq-events-v4-0-30b62b335487@oss.qualcomm.com > Hi, Gentle ping on the IRQ HPD series. I'd like to understand whether the next version of this series is expected to separate the IRQ interfaces or continue with the current design. > [2] drm/msm/dp: Add MST support for MSM chipsets (v5) > https://patchwork.freedesktop.org/series/142207/#rev5 > > [3] drm/msm/dp: Prerequisite cleanup for upcoming MST support (v7) > https://lore.kernel.org/r/20260609-dp_mstclean-v7-0-ea04113e8233@oss.qualcomm.com > > Signed-off-by: Yongxing Mou > --- > Yongxing Mou (5): > drm/bridge: allow hpd_notify() to suppress connector hotplug events > drm/bridge_connector: preserve connector status for IRQ-only HPD events > drm/msm/dp: suppress bridge hotplug events during MST operation > drm/msm/dp: report IRQ_HPD as an IRQ-only notification > drm/msm/dp: mark the SST connector disconnected when MST is enabled > > drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 3 +- > drivers/gpu/drm/display/drm_bridge_connector.c | 31 ++++++++++++++++----- > drivers/gpu/drm/meson/meson_encoder_hdmi.c | 3 +- > drivers/gpu/drm/msm/dp/dp_display.c | 38 +++++++++++++++----------- > drivers/gpu/drm/msm/dp/dp_drm.h | 3 +- > drivers/gpu/drm/omapdrm/dss/hdmi4.c | 3 +- > drivers/soc/qcom/pmic_glink_altmode.c | 14 ++++++---- > include/drm/drm_bridge.h | 3 +- > 8 files changed, 65 insertions(+), 33 deletions(-) > --- > base-commit: e7d700e14934e68f86338c5610cf2ae76798b663 > change-id: 20260629-msm-dp-msttypec-b420df7da587 > prerequisite-message-id: <20260608-hpd-irq-events-v4-0-30b62b335487@oss.qualcomm.com> > prerequisite-patch-id: adc6d802a2f71d23c077a5cdb9a257809e9db50e > prerequisite-patch-id: bbd956a3b65a90c1fe9e884bc32c49bd83fd3129 > prerequisite-patch-id: 014460a25c380d089764ab4e1a58577ebc1b9e71 > prerequisite-patch-id: fc03fb9435b8c60321f9ae28e396a6bff2f347ae > prerequisite-patch-id: cd4cd57a72c798fc95afdfdeb9b81cc7a2dbd25d > prerequisite-patch-id: fe431fb614383eb6444f6bfb928e7e40c2de951e > prerequisite-patch-id: 2a058aa8309016f424b1d4ca19a9b20e92f4d8b6 > prerequisite-patch-id: 64c3616bb979b663a01342d1f217588b347ae8bb > prerequisite-change-id: 20260410-msm-dp-mst-35130b6e8b84:v5 > prerequisite-patch-id: 1d440cb9fed2bdd66d8de0e1e20475f0fe166973 > prerequisite-patch-id: be0f4b80697df7224c80362b161b8a9f0a542184 > prerequisite-patch-id: eefa6e6353df301420feae1da704a9db2c2155f2 > prerequisite-patch-id: 9e9095f82dd6c131c9f3c1de4fdb8a62bd65ca24 > prerequisite-patch-id: 3e635f008f9b56823101abd9253905f078fcb3b5 > prerequisite-patch-id: e39e0dc124ed043c7a419610ebe03ad105da27db > prerequisite-patch-id: 945af39213cd4241e1a5929fada04a9286aeb5db > prerequisite-patch-id: 898ae7e4582a6b31492c223e7dd167fb9ce78096 > prerequisite-patch-id: 3887553893357c1ffbda99eb010801bc2166cbad > prerequisite-patch-id: 7ccd961fa3c6f925659dee7d7a5bd167c8e7331b > prerequisite-patch-id: be2bf918e0e87ec2ea999927f36bd172c498748e > prerequisite-patch-id: 6aacdabb2dd0536dc04da04f8419ae39e35f8b19 > prerequisite-patch-id: a9f27eff8f643ff445810b17d670891928f5b416 > prerequisite-patch-id: efd300a2b52715153b8c1c7407db696eb331594b > prerequisite-patch-id: 950abefc4862050ef606404977fd27c5dd2cbb2b > prerequisite-patch-id: c6a9aaba753b5538864f7f6e065d910833baec21 > prerequisite-patch-id: c73c1f6eb16b2a6ff11b20495fa0981683bdaaee > prerequisite-patch-id: 94957394b3870ec63ab766d682df592da978dd19 > prerequisite-patch-id: f27cba0cf5f08d21f59f29a0c9ed7f197ddfa2c7 > prerequisite-patch-id: 683855949a9ed37bc0cc4d1899373e55eac4ddc3 > prerequisite-patch-id: 9b3a2b526476c32c8a859824e551e23412674766 > prerequisite-patch-id: be866cf2acd4960f31f0dbd05e21f0722dcb70ab > prerequisite-patch-id: 58bd115be590c0d892a72e06794f5b244dbdb7f8 > prerequisite-patch-id: 87435a0f6827516f4e2b5d8471a2b289bb73a88c > prerequisite-patch-id: 1064db7111fc77377dbf246eb0fdef90c18c46ee > prerequisite-patch-id: e112aaf6088f2bfa90bc67feaac86a4fc1ad23ca > prerequisite-patch-id: fcc0f2ee6dc0358d62593c1295d26a013fa11223 > prerequisite-patch-id: 66364b8806fc6abeabe1a0b871e4e8c841ce2aa7 > prerequisite-patch-id: 243046f52a14b416caead3469d580ea5b029f9bb > prerequisite-patch-id: efd8014f647a6aa5fadc9d62a6e1920d76a6c80f > prerequisite-patch-id: f4dbd5ae84a01ea89c7d00ca39fd76cd247bc353 > prerequisite-patch-id: 30a16a45edefc8769b10d90a7807b6522cd31f15 > prerequisite-patch-id: e12fd2908ca33de1f1265fd40190eaad8637e569 > prerequisite-patch-id: 3baac076fdda664d00aa9a83481f76ec38c07e8a > prerequisite-patch-id: ee6a93ffa2d5461ee7b07929ff21626a14773b7a > prerequisite-patch-id: c8d444e2a6512f106da2675d4a42a92208d5c6f1 > prerequisite-patch-id: 0491a69feb036cfa2e75401e093ebad387cf2846 > prerequisite-patch-id: 707e7a3e5114c86f5bcc0b36e7cc8beb0c957780 > prerequisite-patch-id: b1ae90d73bd7c3d19cfe4371b5dc9a816f1316a6 > prerequisite-patch-id: 4c183b8ffd599169c8d3c5f3aad5ecc467b150f2 > prerequisite-message-id: <20260609-dp_mstclean-v7-0-ea04113e8233@oss.qualcomm.com> > prerequisite-patch-id: 1d440cb9fed2bdd66d8de0e1e20475f0fe166973 > prerequisite-patch-id: be0f4b80697df7224c80362b161b8a9f0a542184 > prerequisite-patch-id: eefa6e6353df301420feae1da704a9db2c2155f2 > prerequisite-patch-id: 9e9095f82dd6c131c9f3c1de4fdb8a62bd65ca24 > prerequisite-patch-id: 3e635f008f9b56823101abd9253905f078fcb3b5 > prerequisite-patch-id: e39e0dc124ed043c7a419610ebe03ad105da27db > prerequisite-patch-id: 945af39213cd4241e1a5929fada04a9286aeb5db > prerequisite-patch-id: 898ae7e4582a6b31492c223e7dd167fb9ce78096 > prerequisite-patch-id: 3887553893357c1ffbda99eb010801bc2166cbad > prerequisite-patch-id: 7ccd961fa3c6f925659dee7d7a5bd167c8e7331b > prerequisite-patch-id: be2bf918e0e87ec2ea999927f36bd172c498748e > prerequisite-patch-id: 6aacdabb2dd0536dc04da04f8419ae39e35f8b19 > prerequisite-patch-id: a9f27eff8f643ff445810b17d670891928f5b416 > prerequisite-patch-id: efd300a2b52715153b8c1c7407db696eb331594b > prerequisite-patch-id: 950abefc4862050ef606404977fd27c5dd2cbb2b > > Best regards, _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic