Add support for Multi-stream transport for MSM chipsets that allow a single instance of DP controller to send multiple streams.
This series has been validated on sa8775p ride platform using multiple MST dongles and also daisy chain method on both DP0 and DP1 upto 1080P. With 4x4K monitors, due to lack of layer mixers that combination will not work but this can be supported as well after some rework on the DPU side. In addition, SST was re-validated with all these changes to ensure there were no regressions. This patch series was made on top of: [1] : https://patchwork.freedesktop.org/seriedds/142010/ (v2 to fix up HPD) Bindings for the pixel clock for additional stream is available at : [2] : https://patchwork.freedesktop.org/series/142016/ Overall, the patch series has been organized in the following way: 1) First set are a couple of fixes made while debugging MST but applicable to SST as well so go ahead of everything else 2) Prepare the DP driver to get ready to handle multiple streams. This is the bulk of the work as current DP driver design had to be adjusted to make this happen. 3) Finally, new files to handle MST related operations Validation was done on the latest linux-next on top of above changes and both FB console and weston compositors were validated with these changes. To: Rob Clark <robin.cl...@oss.qualcomm.com> To: Dmitry Baryshkov <lu...@kernel.org> To: Abhinav Kumar <abhinav.ku...@linux.dev> To: Jessica Zhang <jessica.zh...@oss.qualcomm.com> To: Sean Paul <s...@poorly.run> To: Marijn Suijten <marijn.suij...@somainline.org> To: David Airlie <airl...@gmail.com> To: Simona Vetter <sim...@ffwll.ch> Cc: linux-arm-...@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: freedr...@lists.freedesktop.org Cc: linux-ker...@vger.kernel.org Signed-off-by: Yongxing Mou <quic_yong...@quicinc.com> --- Changes in v2: Fixed review comments from Dmitry - Rebase on top of next-20250606 - Add all 4 streams pixel clks support and MST2/MST3 Link clk support - Address the formatting issues mentioned in the review comments - Drop the cache of msm_dp_panel->drm_edid cached - Remove the one-line wrapper funtion and redundant conditional check - Fixed the commit messgae descriptions of some patches - Reordered the patches and renamed some functions and variables - Link to v1: https://lore.kernel.org/all/20241205-dp_mst-v1-0-f 8618d42a...@quicinc.com/ --- Abhinav Kumar (35): drm/msm/dp: split msm_dp_panel_read_sink_caps() into two parts and drop panel drm_edid drm/msm/dp: remove dp_display's dp_mode and use dp_panel's instead drm/msm/dp: break up dp_display_enable into two parts drm/msm/dp: re-arrange dp_display_disable() into functional parts drm/msm/dp: allow dp_ctrl stream APIs to use any panel passed to it drm/msm/dp: move the pixel clock control to its own API drm/msm/dp: split dp_ctrl_off() into stream and link parts drm/msm/dp: make bridge helpers use dp_display to allow re-use drm/msm/dp: separate dp_display_prepare() into its own API drm/msm/dp: introduce the max_streams for dp controller drm/msm/dp: introduce stream_id for each DP panel drm/msm/dp: add support for programming p1/p2/p3 register block drm/msm/dp: use stream_id to change offsets in dp_catalog drm/msm/dp: add support to send ACT packets for MST drm/msm/dp: add support to program mst support in mainlink drm/msm/dp: no need to update tu calculation for mst drm/msm/dp: add support for mst channel slot allocation drm/msm/dp: add support to send vcpf packets in dp controller drm/msm/dp: always program MST_FIFO_CONSTANT_FILL for MST drm/msm/dp: abstract out the dp_display stream helpers to accept a panel drm/msm/dp: move link related operations to dp_display_unprepare() drm/msm/dp: replace power_on with active_stream_cnt for dp_display drm/msm/dp: make the SST bridge disconnected when mst is active drm/msm/dp: add an API to initialize MST on sink side drm/msm/dp: skip reading the EDID for MST cases drm/msm/dp: add dp_display_get_panel() to initialize DP panel drm/msm/dp: add dp_mst_drm to manage DP MST bridge operations drm/msm/dp: add connector abstraction for DP MST drm/msm/dp: add HPD callback for dp MST drm/msm: add support for non-blocking commits drm/msm: initialize DRM MST encoders for DP controllers drm/msm/dp: initialize dp_mst module for each DP MST controller drm/msm/dpu: use msm_dp_get_mst_intf_id() to get the intf id drm/msm/dp: mark ST_DISCONNECTED only if all streams are disabled drm/msm/dp: fix the intf_type of MST interfaces Yongxing Mou (3): drm/msm/dp: Add catalog support for 3rd/4th stream MST drm/msm/dp: propagate MST state changes to dp mst module drm/msm/dp: Add MST stream support for SA8775P DP controller 0 and 1 drivers/gpu/drm/msm/Makefile | 3 +- .../drm/msm/disp/dpu1/catalog/dpu_8_4_sa8775p.h | 8 +- drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 21 +- drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 2 + drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 72 +- drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 2 +- drivers/gpu/drm/msm/dp/dp_audio.c | 2 +- drivers/gpu/drm/msm/dp/dp_catalog.c | 558 ++++++++-- drivers/gpu/drm/msm/dp/dp_catalog.h | 64 +- drivers/gpu/drm/msm/dp/dp_ctrl.c | 474 ++++++--- drivers/gpu/drm/msm/dp/dp_ctrl.h | 22 +- drivers/gpu/drm/msm/dp/dp_display.c | 510 +++++++--- drivers/gpu/drm/msm/dp/dp_display.h | 33 +- drivers/gpu/drm/msm/dp/dp_drm.c | 53 +- drivers/gpu/drm/msm/dp/dp_drm.h | 12 - drivers/gpu/drm/msm/dp/dp_mst_drm.c | 1065 ++++++++++++++++++++ drivers/gpu/drm/msm/dp/dp_mst_drm.h | 106 ++ drivers/gpu/drm/msm/dp/dp_panel.c | 66 +- drivers/gpu/drm/msm/dp/dp_panel.h | 10 +- drivers/gpu/drm/msm/dp/dp_reg.h | 46 +- drivers/gpu/drm/msm/msm_atomic.c | 3 + drivers/gpu/drm/msm/msm_drv.h | 19 + drivers/gpu/drm/msm/msm_kms.c | 2 + 23 files changed, 2725 insertions(+), 428 deletions(-) --- base-commit: 475c850a7fdd0915b856173186d5922899d65686 change-id: 20250609-msm-dp-mst-cddc2f61daee prerequisite-message-id: <20250529-hpd_display_off-v1-0-ce33bac29...@oss.qualcomm.com> prerequisite-patch-id: a1f426b99b4a99d63daa9902cde9ee38ae1128d1 prerequisite-patch-id: ae9e0a0db8edd05da06f9673e9de56761654ed3c prerequisite-patch-id: 7cb84491c6c3cf73480343218c543d090f8cb5e2 prerequisite-patch-id: f32638e79dd498db2075735392e85729b1b691fc prerequisite-message-id: <20250530-dp_mst_bindings-v2-0-f925464d3...@oss.qualcomm.com> prerequisite-patch-id: e505c21f653c8e18ce83cad1fc787c13a6c8ed12 prerequisite-patch-id: cfdd5c37d38b2a4f1386af4021ba3920c6d8dcf8 prerequisite-patch-id: f4abdddcb90c8203044395f4768d794214fe3225 prerequisite-patch-id: 45013dfaf34856422b7b6b3d2ee42d81a917177b prerequisite-patch-id: 2f35bedb0410bead1b66cbfaf51984fc7016828f Best regards, -- Yongxing Mou <quic_yong...@quicinc.com>
