AuxXxilium/linux_dsm_epyc7002
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873a95e0d5
linux_dsm_epyc7002/drivers/gpu/drm
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Lyude Paul 873a95e0d5 drm/dp_mst: Increase ACT retry timeout to 3s 
Currently we only poll for an ACT up to 30 times, with a busy-wait delay
of 100µs between each attempt - giving us a timeout of 2900µs. While
this might seem sensible, it would appear that in certain scenarios it
can take dramatically longer then that for us to receive an ACT. On one
of the EVGA MST hubs that I have available, I observed said hub
sometimes taking longer then a second before signalling the ACT. These
delays mostly seem to occur when previous sideband messages we've sent
are NAKd by the hub, however it wouldn't be particularly surprising if
it's possible to reproduce times like this simply by introducing branch
devices with large LCTs since payload allocations have to take effect on
every downstream device up to the payload's target.

So, instead of just retrying 30 times we poll for the ACT for up to 3ms,
and additionally use usleep_range() to avoid a very long and rude
busy-wait. Note that the previous retry count of 30 appears to have been
arbitrarily chosen, as I can't find any mention of a recommended timeout
or retry count for ACTs in the DisplayPort 2.0 specification. This also
goes for the range we were previously using for udelay(), although I
suspect that was just copied from the recommended delay for link
training on SST devices.

Changes since v1:
* Use readx_poll_timeout() instead of open-coding timeout loop - Sean
  Paul
Changes since v2:
* Increase poll interval to 200us - Sean Paul
* Print status in hex when we timeout waiting for ACT - Sean Paul

Signed-off-by: Lyude Paul <lyude@redhat.com>
Fixes: ad7f8a1f9c ("drm/helper: add Displayport multi-stream helper (v0.6)")
Cc: Sean Paul <sean@poorly.run>
Cc: <stable@vger.kernel.org> # v3.17+
Reviewed-by: Sean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20200406221253.1307209-4-lyude@redhat.com
2020-04-09 12:09:12 -04:00
..
amd drm/amd/amdgpu_dm/mst: Stop printing extra messages in dm_dp_add_mst_connector() 2020-04-03 16:51:51 -04:00
arc drm: convert .debugfs_init() hook to return void. 2020-03-18 17:53:28 +01:00
arm drm/<drivers>: Use drmm_add_final_kfree 2020-03-26 15:26:52 +01:00
armada drm/<drivers>: Use drmm_add_final_kfree 2020-03-26 15:26:52 +01:00
aspeed
ast drm/ast: Set up fbdev after registering device; remove error checks 2020-04-08 16:24:23 +02:00
atmel-hlcdc drm/atmel-hlcdc: Use simple encoder 2020-04-02 14:16:44 +02:00
bochs drm/bochs: Drop explicit drm_mode_config_cleanup 2020-03-26 15:46:09 +01:00
bridge drm/bridge: Add NWL MIPI DSI host controller support 2020-04-09 15:52:47 +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 drm/exynos: Use simple encoder 2020-04-02 14:16:44 +02:00
fsl-dcu drm/fsl-dcu: Use simple encoder 2020-04-02 14:16:44 +02:00
gma500 drm/gma500: Use simple encoder 2020-04-02 14:16:44 +02:00
hisilicon drm/kirin: Set up fbdev after fully registering device 2020-04-08 16:24:40 +02:00
i2c drm/i2c/tda998x: Use simple encoder 2020-04-02 14:16:44 +02:00
i810
i915 drm/dp_mst: Remove drm_dp_mst_has_audio() 2020-04-07 14:30:13 -04:00
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 drm/mediatek: Remove error check from fbdev setup 2020-04-08 16:24:48 +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 drm: convert .debugfs_init() hook to return void. 2020-03-18 17:53:28 +01:00
mxsfb
nouveau drm/nouveau/therm: convert to use i2c_new_client_device() 2020-03-28 22:48:17 +01:00
omapdrm drm: convert .debugfs_init() hook to return void. 2020-03-18 17:53:28 +01:00
panel drm/panel: support for boe,tv105wum-nw0 dsi video mode panel 2020-04-08 22:19:22 +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 drm: delete drm_pci.h 2020-04-03 17:11:41 +02:00
rcar-du drm/rcar-du: Use simple encoder 2020-04-02 14:16:45 +02:00
rockchip drm/rockchip: Use simple encoder 2020-04-02 14:16:45 +02:00
savage
scheduler drm/sched: implement and export drm_sched_pick_best 2020-03-16 16:21:32 -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/tegra: Use simple encoder 2020-04-02 14:16:45 +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 drm/ttm: lock resv object during destruction 2020-04-01 09:02:45 +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 drm/vboxvideo: Set up fbdev after registering device; remove error checks 2020-04-08 16:25:02 +02:00
vc4 drm/vc4: Use simple encoder 2020-04-02 14:16:45 +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: make virtio_gpu_object_attach void 2020-04-03 12:01:37 +02:00
vkms drm/vkms: Use simple encoder 2020-04-02 14:16:46 +02:00
vmwgfx drm/vmwgfx: Use vmwgfx version 2.18 to signal SM5 compatibility 2020-03-23 22:48:57 +01:00
xen drm: Garbage collect drm_dev_fini 2020-03-26 15:45:36 +01:00
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_cec.c
drm_dp_dual_mode_helper.c
drm_dp_helper.c UAPI Changes: 2020-03-19 10:40:27 +10:00
drm_dp_mst_topology_internal.h
drm_dp_mst_topology.c drm/dp_mst: Increase ACT retry timeout to 3s 2020-04-09 12:09:12 -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_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: Nerf drm_global_mutex BKL for good drivers 2020-02-11 15:03:09 +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/core: Calculate bpp in afbc helper 2020-04-01 14:11:22 +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_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 14:47:51 +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_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