AuxXxilium/linux_dsm_epyc7002
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973a5909e9
linux_dsm_epyc7002/drivers/gpu/drm
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Lyude Paul 973a5909e9 Revert "drm/dp_mst: Remove single tx msg restriction." 
This reverts commit 6bb0942e8f.

Unfortunately it would appear that the rumors we've heard of sideband
message interleaving not being very well supported are true. On the
Lenovo ThinkPad Thunderbolt 3 dock that I have, interleaved messages
appear to just get dropped:

  [drm:drm_dp_mst_wait_tx_reply [drm_kms_helper]] timedout msg send
  00000000571ddfd0 2 1
  [dp_mst] txmsg cur_offset=2 cur_len=2 seqno=1 state=SENT path_msg=1 dst=00
  [dp_mst] 	type=ENUM_PATH_RESOURCES contents:
  [dp_mst] 		port=2

DP descriptor for this hub:
  OUI 90-cc-24 dev-ID SYNA3  HW-rev 1.0 SW-rev 3.12 quirks 0x0008

It would seem like as well that this is a somewhat well known issue in
the field. From section 5.4.2 of the DisplayPort 2.0 specification:

  There are MST Sink/Branch devices in the field that do not handle
  interleaved message transactions.

  To facilitate message transaction handling by downstream devices, an
  MST Source device shall generate message transactions in an atomic
  manner (i.e., the MST Source device shall not concurrently interleave
  multiple message transactions). Therefore, an MST Source device shall
  clear the Message_Sequence_No value in the Sideband_MSG_Header to 0.

  MST Source devices that support field policy updates by way of
  software should update the policy to forego the generation of
  interleaved message transactions.

This is a bit disappointing, as features like HDCP require that we send
a sideband request every ~2 seconds for each active stream. However,
there isn't really anything in the specification that allows us to
accurately probe for interleaved messages.

If it ends up being that we -really- need this in the future, we might
be able to whitelist hubs where interleaving is known to work-or maybe
try some sort of heuristics. But for now, let's just play it safe and
not use it.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Fixes: 6bb0942e8f ("drm/dp_mst: Remove single tx msg restriction.")
Cc: Wayne Lin <Wayne.Lin@amd.com>
Cc: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200423164225.680178-1-lyude@redhat.com
Reviewed-by: Sean Paul <sean@poorly.run>
2020-04-23 13:18:17 -04:00
..
amd Topic pull request for topic/phy-compliance: 2020-04-17 08:52:39 +02:00
arc drm: convert .debugfs_init() hook to return void. 2020-03-18 17:53:28 +01:00
arm Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
armada drm/<drivers>: Use drmm_add_final_kfree 2020-03-26 15:26:52 +01:00
aspeed
ast drm/ast: Allocate initial CRTC state of the correct size 2020-04-20 15:48:23 +02:00
atmel-hlcdc drm/atmel-hlcdc: Use simple encoder 2020-04-02 14:16:44 +02:00
bochs Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
bridge drm: Fix misspellings of "Analog Devices" 2020-04-21 08:15:03 +02:00
cirrus drm/cirrus: Fully embrace devm_ 2020-03-26 15:48:34 +01:00
etnaviv Merge remote-tracking branch 'drm/drm-next' into drm-misc-next 2020-03-26 15:11:04 +01:00
exynos Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
fsl-dcu drm/fsl-dcu: Use simple encoder 2020-04-02 14:16:44 +02:00
gma500 drm/gma500: Remove dead code 2020-04-21 09:02:29 +02:00
hisilicon drm: kirin: Revert change to add register connect helper functions 2020-04-13 01:46:02 +00:00
i2c drm/i2c/tda998x: Use simple encoder 2020-04-02 14:16:44 +02:00
i810
i915 Topic pull request for topic/phy-compliance: 2020-04-17 08:52:39 +02:00
imx drm/imx: Use simple encoder 2020-04-02 14:16:44 +02:00
ingenic drm/ingenic: Remove error check from fbdev setup 2020-04-08 16:24:44 +02:00
lib
lima drm/lima: Add optional devfreq and cooling device support 2020-03-28 16:29:46 +08:00
mcde drm/mcde: More devm_drm_dev_init 2020-03-26 16:05:12 +01:00
mediatek Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
meson drm/meson: Drop explicit drm_mode_config_cleanup call 2020-03-26 16:05:31 +01:00
mga
mgag200 drm/mgag200: Set up fbdev after registering device; remove error checks 2020-04-08 16:24:52 +02:00
msm Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
mxsfb
nouveau Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
omapdrm Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
panel Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
panfrost drm-misc-next for 5.7: 2020-03-12 12:42:56 +10:00
pl111 drm/pl111: Drop explicit drm_mode_config_cleanup call 2020-03-26 16:05:39 +01:00
qxl drm/qxl: Use correct notify port address when creating cursor ring 2020-03-31 16:48:00 +02:00
r128 drm: delete drm_pci.h 2020-04-03 17:11:41 +02:00
radeon Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
rcar-du drm/rcar-du: Use simple encoder 2020-04-02 14:16:45 +02:00
rockchip Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
savage
scheduler drm/scheduler: fix rare NULL ptr race 2020-03-26 10:22:36 -04:00
selftests drm/modes: Make sure to parse valid rotation value from cmdline 2020-02-12 18:32:54 +01:00
shmobile drm/shmobile: Use simple encoder 2020-04-02 14:16:45 +02:00
sis
sti drm: convert .debugfs_init() hook to return void. 2020-03-18 17:53:28 +01:00
stm drm/stm: Drop explicit drm_mode_config_cleanup call 2020-03-26 16:06:00 +01:00
sun4i drm/sun4i: tcon: Delete an error message in sun4i_tcon_init_irq() 2020-04-06 10:19:25 +02:00
tdfx
tegra drm: Fix misspellings of "Analog Devices" 2020-04-21 08:15:03 +02:00
tidss drm/tidss: Use simple encoder 2020-04-02 14:16:45 +02:00
tilcdc drm/tilcdc: Set up fbdev after fully registering device 2020-04-08 16:24:56 +02:00
tiny drm/mipi-dbi: Drop explicit drm_mode_config_cleanup call 2020-03-26 16:09:10 +01:00
ttm Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
tve200
udl drm/udl: Remove error check from fbdev setup 2020-04-08 16:24:59 +02:00
v3d drm/v3d: Use drmm_add_final_kfree 2020-03-26 15:18:11 +01:00
vboxvideo Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
vc4 Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
vgem drm: Garbage collect drm_dev_fini 2020-03-26 15:45:36 +01:00
via Merge branch 'akpm' (patches from Andrew) 2020-01-31 12:16:36 -08:00
virtio drm/virtio: fix OOB in virtio_gpu_object_create 2020-04-06 15:10:37 +02:00
vkms drm/vkms: Use simple encoder 2020-04-02 14:16:46 +02:00
vmwgfx Merge branch 'ttm-transhuge' of git://people.freedesktop.org/~thomash/linux into drm-next 2020-04-03 09:07:49 +10:00
xen Merge drm/drm-next into drm-misc-next 2020-04-17 08:12:22 +02:00
zte drm/zte: Use simple encoder 2020-04-02 14:16:46 +02:00
drm_agpsupport.c
drm_atomic_helper.c drm/bridge: Add the necessary bits to support bus format negotiation 2020-01-31 16:39:53 +01:00
drm_atomic_state_helper.c drm/atomic-helper: fix kerneldoc 2020-02-15 13:21:22 +01:00
drm_atomic_uapi.c
drm_atomic.c drm: convert .debugfs_init() hook to return void. 2020-03-18 17:53:28 +01:00
drm_auth.c drm: error out with EBUSY when device has existing master 2020-03-30 12:20:41 +01:00
drm_blend.c drm: add docs about the IN_FORMATS plane property 2020-03-31 11:12:42 +02:00
drm_bridge_connector.c drm: Add helper to create a connector for a chain of bridges 2020-02-26 13:31:41 +02:00
drm_bridge.c drm: Add helper to create a connector for a chain of bridges 2020-02-26 13:31:41 +02:00
drm_bufs.c drm: delete drm_pci.h 2020-04-03 17:11:41 +02:00
drm_cache.c
drm_client_modeset.c Linux 5.6-rc5 2020-03-11 07:27:21 +10:00
drm_client.c drm: convert .debugfs_init() hook to return void. 2020-03-18 17:53:28 +01:00
drm_color_mgmt.c
drm_connector.c drm/edid: Fix DispID tile parsing for override EDID 2020-03-18 17:52:36 +02:00
drm_context.c drm: context: Clean up documentation 2020-03-16 09:23:55 +01:00
drm_crtc_helper_internal.h
drm_crtc_helper.c drm: drop unused drm_crtc callback 2020-02-15 21:15:17 +01:00
drm_crtc_internal.h drm: convert .debugfs_init() hook to return void. 2020-03-18 17:53:28 +01:00
drm_crtc.c
drm_damage_helper.c
drm_debugfs_crc.c drm/crc: Actually allow to change the crc source 2020-01-28 16:49:22 +01:00
drm_debugfs.c drm: convert .debugfs_init() hook to return void. 2020-03-18 17:53:28 +01:00
drm_dma.c drm: delete drm_pci.h 2020-04-03 17:11:41 +02:00
drm_dp_aux_dev.c drm/dp_mst: Add MST support to DP DPCD R/W functions 2020-01-09 18:07:46 -05:00
drm_dp_cec.c
drm_dp_dual_mode_helper.c
drm_dp_helper.c drm/dp: get/set phy compliance pattern 2020-04-08 14:40:42 +02:00
drm_dp_mst_topology_internal.h
drm_dp_mst_topology.c Revert "drm/dp_mst: Remove single tx msg restriction." 2020-04-23 13:18:17 -04:00
drm_drv.c drm: Fix wrong kfree() in managed resource usage example 2020-04-02 13:04:57 +02:00
drm_dsc.c
drm_dumb_buffers.c
drm_edid_load.c
drm_edid.c drm/edid: Fix DispID tile parsing for override EDID 2020-03-18 17:52:36 +02:00
drm_encoder_slave.c
drm_encoder.c
drm_fb_cma_helper.c drm: Fix misspellings of "Analog Devices" 2020-04-21 08:15:03 +02:00
drm_fb_helper.c drm/fb-helper: Remove return value from drm_fbdev_generic_setup() 2020-04-08 16:27:08 +02:00
drm_file.c drm/vmwgfx: Hook up the helpers to align buffer objects 2020-03-24 18:50:35 +01:00
drm_flip_work.c
drm_format_helper.c drm/format_helper: Dual licence the file in GPL 2 and MIT 2020-02-17 10:27:13 +01:00
drm_fourcc.c
drm_framebuffer.c drm: convert .debugfs_init() hook to return void. 2020-03-18 17:53:28 +01:00
drm_gem_cma_helper.c
drm_gem_framebuffer_helper.c drm: Don't free a struct never allocated by drm_gem_fb_init() 2020-04-16 13:44:29 +02:00
drm_gem_shmem_helper.c drm/shmem: drop pgprot_decrypted() 2020-03-02 07:13:19 +01:00
drm_gem_ttm_helper.c
drm_gem_vram_helper.c drm/vram-helpers: Merge code into a single file 2020-04-09 09:56:33 +02:00
drm_gem.c drm: Manage drm_gem_init with drmm_ 2020-03-26 15:38:09 +01:00
drm_hashtab.c
drm_hdcp.c drm/hdcp: optimizing the srm handling 2020-03-04 06:33:00 +05:30
drm_internal.h drm: Manage drm_vblank_cleanup with drmm_ 2020-03-26 15:38:17 +01:00
drm_ioc32.c
drm_ioctl.c drm: rework SET_MASTER and DROP_MASTER perm handling 2020-03-30 12:20:32 +01:00
drm_irq.c drm/irq: remove check on dev->dev_private 2020-02-11 18:39:47 +02:00
drm_kms_helper_common.c
drm_lease.c drm/lease: fix WARNING in idr_destroy 2020-03-18 14:42:18 +01:00
drm_legacy_misc.c
drm_legacy.h
drm_lock.c drm: lock: Clean up documentation 2020-03-16 09:27:09 +01:00
drm_managed.c drm/managed: Fix off-by-one in warning 2020-03-30 21:42:23 +02:00
drm_memory.c
drm_mipi_dbi.c drm/mipi-dbi: Drop explicit drm_mode_config_cleanup call 2020-03-26 16:09:10 +01:00
drm_mipi_dsi.c
drm_mm.c drm/mm: revert "Break long searches in fragmented address spaces" 2020-03-31 17:35:56 +02:00
drm_mode_config.c drm: Manage drm_mode_config_init with drmm_ 2020-03-26 15:45:43 +01:00
drm_mode_object.c
drm_modes.c drm/modes: Make sure to parse valid rotation value from cmdline 2020-02-12 18:32:54 +01:00
drm_modeset_helper.c
drm_modeset_lock.c
drm_of.c
drm_panel_orientation_quirks.c
drm_panel.c
drm_pci.c drm: delete drm_pci.h 2020-04-03 17:11:41 +02:00
drm_plane_helper.c
drm_plane.c
drm_prime.c drm/prime: fix extracting of the DMA addresses from a scatterlist 2020-04-05 10:44:12 -04:00
drm_print.c
drm_probe_helper.c
drm_property.c
drm_rect.c
drm_scatter.c drm: prevent a harmless integer overflow in drm_legacy_sg_alloc() 2020-02-29 00:16:12 +01:00
drm_scdc_helper.c
drm_self_refresh_helper.c
drm_simple_kms_helper.c drm/simple-kms: Fix documentation for drm_simple_encoder_init() 2020-03-06 09:24:29 +01:00
drm_syncobj.c drm/syncobj: Add documentation for timeline syncobj 2020-01-20 14:22:21 +01:00
drm_sysfs.c drm: sysfs: Use scnprintf() for avoiding potential buffer overflow 2020-03-11 14:54:09 +01:00
drm_trace_points.c
drm_trace.h
drm_vblank.c drm/vblank: Add intro to documentation 2020-04-07 18:32:42 +02:00
drm_vm.c drm: drm_vm: Use fallthrough; 2020-03-18 14:48:34 +01:00
drm_vma_manager.c
drm_writeback.c
Kconfig drm: unbreak the DRM menu, broken by DRM_EXPORT_FOR_TESTS 2020-03-06 11:15:43 +00:00
Makefile drm/vram-helpers: Merge code into a single file 2020-04-09 09:56:33 +02:00