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c1d6a22b72
linux/include/drm
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Imre Deak c1d6a22b72 drm/dp: Add helpers to calculate the link BW overhead 
Add helpers drivers can use to calculate the BW allocation overhead -
due to SSC, FEC, DSC and data alignment on symbol cycles - and the
channel coding efficiency - due to the 8b/10b, 128b/132b encoding. On
128b/132b links the FEC overhead is part of the coding efficiency, so
not accounted for in the BW allocation overhead.

The drivers can use these functions to calculate a ratio, controlling
the stream symbol insertion rate of the source device in each SST TU
or MST MTP frame. Drivers can calculate this

m/n = (pixel_data_rate * drm_dp_bw_overhead()) /
      (link_data_rate * drm_dp_bw_channel_coding_efficiency())

ratio for a given link and pixel stream and with that the

slots_per_mtp = CEIL(64 * m / n)

allocated slots per MTP for the stream in a link frame and with
that the

pbn = slots_per_mtp * drm_mst_get_pbn_divider()

allocated PBNs for the stream on the MST link path.

Take drm_dp_bw_overhead() into use in drm_dp_calc_pbn_mode(), for
drivers calculating the PBN value directly.

v2:
- Add dockbook description to drm_dp_bw_channel_coding_efficiency().
  (LKP).
- Clarify the way m/n ratio is calculated in the commit log.
v3:
- Fix compile breakage for !CONFIG_BACKLIGHT_CLASS_DEVICE. (LKP)
- Account for FEC_PM overhead (+ 0.0015625 %), add comment
  with the formula to calculate the total FEC overhead. (Ville)
v4:
- Rename DRM_DP_OVERHEAD_SSC to DRM_DP_OVERHEAD_SSC_REF_CLK. (Ville)
v5:
- Clarify in the commit log what MTP means.
- Simplify the commit log's formula to calculate PBN.

Cc: Lyude Paul <lyude@redhat.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: kernel test robot <lkp@intel.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> (v2)
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231107001505.3370108-1-imre.deak@intel.com
2023-11-08 17:22:10 +02:00
..
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/dp: Add helpers to calculate the link BW overhead 2023-11-08 17:22:10 +02:00
i2c
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_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_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_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_bridge_connector.h drm/bridge_connector: drop drm_bridge_connector_en/disable_hpd() 2023-01-05 15:08:10 +01:00
drm_bridge.h drm/bridge: Drop conditionals around of_node pointers 2023-09-06 08:32:37 -07:00
drm_buddy.h drm/buddy: Improve contiguous memory allocation 2023-09-11 20:18:00 +02:00
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_connector.h Merge drm/drm-next into drm-intel-next 2023-10-04 18:06:27 +03:00
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_crtc.h drm: Remove references to removed transitional helpers 2023-07-29 21:25:16 +02:00
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_crc.h
drm_debugfs.h drm/gpuvm: rename struct drm_gpuva_manager to struct drm_gpuvm 2023-09-26 01:51:28 +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 Merge drm/drm-next into drm-intel-next 2023-09-15 11:23:38 +03:00
drm_encoder_slave.h drm: Remove linux/i2c.h from drm_crtc.h 2022-07-05 21:15:23 +03:00
drm_encoder.h drm/encoder: Introduce drmm_encoder_init 2022-07-13 10:46:05 +02:00
drm_exec.h drm/drm_exec: Work around a WW mutex lockdep oddity 2023-09-07 10:30:12 +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/fb-helper: Remove unused inline function drm_fb_helper_defio_init() 2023-07-25 20:38:37 +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: Update file owner during use 2023-09-20 15:27:44 +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_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_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_gem.h drm/gem: fix lockdep check for dma-resv lock 2023-08-04 20:34:31 +02:00
drm_gpuvm.h drm/gpuvm: rename struct drm_gpuva_manager to struct drm_gpuvm 2023-09-26 01:51:28 +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: Avoid a driver uaf 2023-09-14 13:57:58 +02:00
drm_lease.h
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_vtables.h drm: Remove references to removed transitional helpers 2023-07-29 21:25:16 +02:00
drm_modeset_helper.h
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_helper.h drm/plane-helper: Add the missing declaration of drm_atomic_state 2022-12-16 10:23:11 +01:00
drm_plane.h drm/drm_plane.h: fix grammar of the comment 2023-08-03 11:06:03 +02:00
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: Add an HPD poll helper to reschedule the poll work 2023-08-23 17:14:37 -04:00
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_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_utils.h
drm_vblank_work.h
drm_vblank.h drm/vblank: Add helper to get next vblank time 2023-03-28 14:52:59 -07:00
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
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 new DG2 PCI IDs 2023-10-12 10:48:15 -07:00
i915_pxp_tee_interface.h mei: pxp: add command streamer API to the PXP driver 2022-10-03 11:29:11 -07:00
intel_lpe_audio.h
intel-gtt.h agp/intel: Rename intel-gtt symbols 2022-06-22 15:52:55 -07:00
spsc_queue.h
task_barrier.h drm: Spelling s/randevouz/rendez-vous/ 2023-07-29 21:11:54 +02:00