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linux/include/drm
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Wayne Lin 5aa1dfcdf0 drm/mst: Refactor the flow for payload allocation/removement 
[Why]
Today, the allocation/deallocation steps and status is a bit unclear.

For instance, payload->vc_start_slot = -1 stands for "the failure of
updating DPCD payload ID table" and can also represent as "payload is not
allocated yet". These two cases should be handled differently and hence
better to distinguish them for better understanding.

[How]
Define enumeration - ALLOCATION_LOCAL, ALLOCATION_DFP and ALLOCATION_REMOTE
to distinguish different allocation status. Adjust the code to handle
different status accordingly for better understanding the sequence of
payload allocation and payload removement.

For payload creation, the procedure should look like this:
DRM part 1:
* step 1 - update sw mst mgr variables to add a new payload
* step 2 - add payload at immediate DFP DPCD payload table

Driver:
* Add new payload in HW and sync up with DFP by sending ACT

DRM Part 2:
* Send ALLOCATE_PAYLOAD sideband message to allocate bandwidth along the
  virtual channel.

And as for payload removement, the procedure should look like this:
DRM part 1:
* step 1 - Send ALLOCATE_PAYLOAD sideband message to release bandwidth
           along the virtual channel
* step 2 - Clear payload allocation at immediate DFP DPCD payload table

Driver:
* Remove the payload in HW and sync up with DFP by sending ACT

DRM part 2:
* update sw mst mgr variables to remove the payload

Note that it's fine to fail when communicate with the branch device
connected at immediate downstrean-facing port, but updating variables of
SW mst mgr and HW configuration should be conducted anyway. That's because
it's under commit_tail and we need to complete the HW programming.

Changes since v1:
* Remove the set but not use variable 'old_payload' in function
  'nv50_msto_prepare'. Catched by kernel test robot <lkp@intel.com>

Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230807025639.1612361-3-Wayne.Lin@amd.com
History 2023-09-08 17:00:57 -04:00
..
bridge drm: bridge: samsung-dsim: Fix waiting for empty cmd transfer FIFO on older Exynos 2023-08-11 14:54:05 +02:00
display drm/mst: Refactor the flow for payload allocation/removement 2023-09-08 17:00:57 -04:00
i2c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ttm drm/ttm: Remove two unused function declarations 2023-08-10 09:12:08 +02:00
amd_asic_type.h drm/amdgpu: add new asic_type for IP discovery 2021-10-04 15:23:01 -04:00
drm_accel.h drm/debugfs: rework debugfs directory creation v5 2023-09-01 08:51:18 +02:00
drm_aperture.h drm/aperture: Remove primary argument 2023-04-16 14:17:41 +02:00
drm_atomic.h drm/bridge: Fix kernel-doc typo in desc of output_bus_cfg in drm_bridge_state 2023-08-21 10:01:04 +02:00
drm_atomic_helper.h drm/atomic-helper: Add atomic_enable plane-helper callback 2023-02-20 15:19:23 +01:00
drm_atomic_state_helper.h drm/atomic-helper: Add an analog TV atomic_check implementation 2022-11-24 12:42:40 +01:00
drm_atomic_uapi.h drm: handle kernel fences in drm_gem_plane_helper_prepare_fb v2 2022-05-02 09:01:51 +02:00
drm_audio_component.h drm/audio: make drm_audio_component.h self-contained 2022-11-29 14:14:51 +02:00
drm_auth.h drm: clarify usage of drm leases 2021-07-29 09:12:01 +02:00
drm_blend.h drm: Add per-plane pixel blend mode property 2018-08-24 17:31:37 +01:00
drm_bridge.h drm/bridge: Drop conditionals around of_node pointers 2023-09-06 08:32:37 -07:00
drm_bridge_connector.h drm/bridge_connector: drop drm_bridge_connector_en/disable_hpd() 2023-01-05 15:08:10 +01:00
drm_buddy.h drm/selftests: add drm buddy alloc range testcase 2022-02-23 10:44:43 +01:00
drm_cache.h LoongArch: Add writecombine support for drm 2022-06-03 20:09:27 +08:00
drm_client.h drm/debugfs: rework debugfs directory creation v5 2023-09-01 08:51:18 +02:00
drm_color_mgmt.h drm: Inline drm_color_lut_extract() 2019-11-29 21:29:17 +02:00
drm_connector.h drm/connector: document DRM_MODE_COLORIMETRY_COUNT 2023-09-07 16:32:21 +02:00
drm_crtc.h drm: Remove references to removed transitional helpers 2023-07-29 21:25:16 +02:00
drm_crtc_helper.h drm/crtc-helper: Remove most include statements from drm_crtc_helper.h 2023-01-18 09:25:32 +01:00
drm_damage_helper.h drm/plane: Move drm_plane_enable_fb_damage_clips into core 2021-07-27 12:21:22 +02:00
drm_debugfs.h drm/debugfs: rework drm_debugfs_create_files implementation v2 2023-09-01 08:54:12 +02:00
drm_debugfs_crc.h drm/crc: Only report a single overflow when a CRC fd is opened 2018-07-06 14:57:03 +02:00
drm_device.h drm/debugfs: remove dev->debugfs_list and debugfs_mutex v2 2023-09-01 08:53:05 +02:00
drm_displayid.h drm/displayid: provide access to DisplayID version and primary use case 2023-02-27 02:58:38 +03:00
drm_drv.h drm/debugfs: Add inline to drm_debugfs_dev_init() to suppres -Wunused-function 2023-09-08 17:23:31 -03:00
drm_edid.h drm/edid: add drm_edid_read_switcheroo() 2023-06-02 13:23:10 +03:00
drm_encoder.h drm/encoder: Introduce drmm_encoder_init 2022-07-13 10:46:05 +02:00
drm_encoder_slave.h drm: Remove linux/i2c.h from drm_crtc.h 2022-07-05 21:15:23 +03:00
drm_exec.h drm/exec: use unique instead of local label 2023-08-10 08:38:52 +02:00
drm_fb_dma_helper.h drm/gem: rename GEM CMA helpers to GEM DMA helpers 2022-08-03 18:31:49 +02:00
drm_fb_helper.h drm/i915: Implement dedicated fbdev I/O helpers 2023-06-01 12:41:40 +02:00
drm_fbdev_dma.h drm/fbdev-dma: Implement fbdev emulation for GEM DMA helpers 2023-03-14 17:07:47 +01:00
drm_fbdev_generic.h drm/fb-helper: Move generic fbdev emulation into separate source file 2022-11-05 17:12:04 +01:00
drm_file.h drm/debugfs: rework drm_debugfs_create_files implementation v2 2023-09-01 08:54:12 +02:00
drm_fixed.h drm: Add fixed-point helper to get rounded integer values 2023-05-15 10:58:10 -03:00
drm_flip_work.h drm/kms-helpers: Use recommened kerneldoc for struct member refs 2017-01-25 16:18:57 +01:00
drm_format_helper.h drm/format-helper: Simplify drm_fb_build_fourcc_list() 2023-01-03 14:27:39 +01:00
drm_fourcc.h drm/fourcc: Add drm_format_info.is_color_indexed flag 2022-07-09 15:00:08 +02:00
drm_framebuffer.h drm/fb: Improve drm_framebuffer.offsets documentation 2022-07-09 15:58:52 +02:00
drm_gem.h drm/gem: fix lockdep check for dma-resv lock 2023-08-04 20:34:31 +02:00
drm_gem_atomic_helper.h drm/simple-kms: Remove drm_gem_simple_display_pipe_prepare_fb() 2022-12-05 13:35:37 +01:00
drm_gem_dma_helper.h drm: Clear fd/handle callbacks in struct drm_driver 2023-06-26 11:08:41 +02:00
drm_gem_framebuffer_helper.h drm/gem: Ignore color planes that are unused by framebuffer format 2022-05-19 19:25:02 +02:00
drm_gem_shmem_helper.h drm: Clear fd/handle callbacks in struct drm_driver 2023-06-26 11:08:41 +02:00
drm_gem_ttm_helper.h drm/ttm: merge ttm_bo_api.h and ttm_bo_driver.h v2 2022-12-06 12:54:14 +01:00
drm_gem_vram_helper.h drm: Clear fd/handle callbacks in struct drm_driver 2023-06-26 11:08:41 +02:00
drm_gpuva_mgr.h drm: manager to keep track of GPUs VA mappings 2023-07-20 05:15:53 +02:00
drm_ioctl.h drm: unexport drm_ioctl_permit 2021-08-13 17:50:48 +02:00
drm_kunit_helpers.h drm/tests: helpers: Create a helper to allocate an atomic state 2023-07-31 14:19:57 +02:00
drm_lease.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
drm_legacy.h drm: Declare hashtable as legacy 2021-11-30 09:41:28 +01:00
drm_managed.h drm: fix drmm_mutex_init() 2023-05-22 12:23:50 +02:00
drm_mipi_dbi.h drm/mipi-dbi: Support separate I/O regulator 2022-12-14 14:57:09 +01:00
drm_mipi_dsi.h Driver core changes for 6.3-rc1 2023-02-24 12:58:55 -08:00
drm_mm.h drm: Replace kernel.h with the necessary inclusions 2021-12-09 13:46:13 +01:00
drm_mode_config.h drm/fbdev-generic: Remove unused prefer_shadow_fbdev flag 2023-03-22 13:32:47 +01:00
drm_mode_object.h drm/object: Add drm_object_property_get_default_value() function 2022-02-25 17:55:42 +01:00
drm_modes.h drm/modes: Add a function to generate analog display modes 2022-11-24 12:42:39 +01:00
drm_modeset_helper.h drm: remove drmP.h from drm_modeset_helper.h 2019-02-07 21:48:34 +01:00
drm_modeset_helper_vtables.h drm: Remove references to removed transitional helpers 2023-07-29 21:25:16 +02:00
drm_modeset_lock.h drm/locking: fix drm_modeset_acquire_ctx kernel-doc 2022-01-20 14:41:25 +02:00
drm_module.h drm: Provide platform module-init macro 2022-01-19 18:40:18 +01:00
drm_of.h drm: of: Add drm_of_get_dsi_bus helper function 2023-01-27 09:39:21 +01:00
drm_panel.h drm/panel: Fix kernel-doc typo for follower_lock 2023-08-03 10:21:27 +02:00
drm_pciids.h drm: Remove some obsolete drm pciids(tdfx, mga, i810, savage, r128, sis, via) 2023-01-13 09:44:56 +01:00
drm_plane.h drm/drm_plane.h: fix grammar of the comment 2023-08-03 11:06:03 +02:00
drm_plane_helper.h drm/plane-helper: Add the missing declaration of drm_atomic_state 2022-12-16 10:23:11 +01:00
drm_prime.h drm/prime: Unexport helpers for fd/handle conversion 2023-06-26 11:08:46 +02:00
drm_print.h Merge tag 'amd-drm-next-6.3-2023-01-27' of https://gitlab.freedesktop.org/agd5f/linux into drm-next 2023-01-30 15:37:57 +10:00
drm_privacy_screen_consumer.h drm/privacy-screen: Add notifier support (v2) 2021-10-14 13:12:25 +02:00
drm_privacy_screen_driver.h drm/privacy_screen: Add drvdata in drm_privacy_screen 2022-01-10 12:17:37 +01:00
drm_privacy_screen_machine.h drm/privacy-screen: Add X86 specific arch init code 2021-10-14 13:12:24 +02:00
drm_probe_helper.h drm/probe-helper: Provide a TV get_modes helper 2022-11-24 12:42:40 +01:00
drm_property.h drm: document drm_property_enum.value for bitfields 2021-07-26 10:08:22 +02:00
drm_rect.h drm/rect: Add DRM_RECT_INIT() macro 2022-06-27 13:45:48 +02:00
drm_self_refresh_helper.h drm/atomic: fix self-refresh helpers crtc state dereference 2019-11-06 13:00:21 -05:00
drm_simple_kms_helper.h drm/simple-kms: Remove drm_gem_simple_display_pipe_prepare_fb() 2022-12-05 13:35:37 +01:00
drm_suballoc.h drm/suballoc: Extract amdgpu_sa.c as generic suballocation helper 2023-03-01 17:18:19 +01:00
drm_syncobj.h drm/syncobj: add IOCTL to register an eventfd 2023-07-20 12:01:03 +02:00
drm_sysfs.h drm/sysfs: rename drm_sysfs_connector_status_event() 2023-06-23 15:54:00 +02:00
drm_util.h drm: Move EXPORT_SYMBOL_FOR_TESTS_ONLY under a separate Kconfig 2019-11-07 21:22:15 +00:00
drm_utils.h drm: export drm_timeout_abs_to_jiffies 2019-03-07 12:00:30 -06:00
drm_vblank.h drm/vblank: Add helper to get next vblank time 2023-03-28 14:52:59 -07:00
drm_vblank_work.h drm/vblank: Add vblank works 2020-07-16 18:16:31 -04:00
drm_vma_manager.h drm/drm_vma_manager: Add drm_vma_node_allow_once() 2023-01-19 14:16:55 +01:00
drm_writeback.h drm: introduce drm_writeback_connector_init_with_encoder() API 2022-05-02 02:12:59 +03:00
gma_drm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 335 2019-06-05 17:37:06 +02:00
gpu_scheduler.h Linux 6.5-rc1 2023-07-11 09:23:20 +02:00
gud.h drm/gud: Add GUD_PIXEL_FORMAT_RGB888 2021-10-04 12:06:14 +02:00
i915_component.h drm/i915/mtl: Define GSC Proxy component interface 2023-05-04 02:57:28 -07:00
i915_drm.h drm/i915_drm.h: fix a typo 2023-06-02 20:05:45 +03:00
i915_gsc_proxy_mei_interface.h drm/i915/mtl: Define GSC Proxy component interface 2023-05-04 02:57:28 -07:00
i915_hdcp_interface.h drm/i915/hdcp: Move away from master naming to arbiter 2023-05-31 10:22:13 +05:30
i915_pciids.h drm/i915: Add RPL-U sub platform 2023-02-16 12:29:51 +02:00
i915_pxp_tee_interface.h mei: pxp: add command streamer API to the PXP driver 2022-10-03 11:29:11 -07:00
intel-gtt.h agp/intel: Rename intel-gtt symbols 2022-06-22 15:52:55 -07:00
intel_lpe_audio.h ALSA: x86: Register multiple PCM devices for the LPE audio card 2017-05-03 16:24:00 +03:00
spsc_queue.h drm: move amd_gpu_scheduler into common location 2017-12-07 11:51:56 -05:00
task_barrier.h drm: Spelling s/randevouz/rendez-vous/ 2023-07-29 21:11:54 +02:00