AuxXxilium/linux_dsm_epyc7002
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b26b4590dd
linux_dsm_epyc7002/drivers/gpu/drm
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Lyude Paul b26b4590dd drm/nouveau: Only write DP_MSTM_CTRL when needed 
Currently, nouveau will re-write the DP_MSTM_CTRL register for an MST
hub every time it receives a long HPD pulse on DP. This isn't actually
necessary and additionally, has some unintended side effects.

With the P50 I've got here, rewriting DP_MSTM_CTRL constantly seems to
make it rather likely (1 out of 5 times usually) that bringing up MST
with it's ThinkPad dock will fail and result in sideband messages timing
out in the middle. Afterwards, successive probes don't manage to get the
dock to communicate properly over MST sideband properly.

Many times sideband message timeouts from MST hubs are indicative of
either the source or the sink dropping an ESI event, which can cause
DRM's perspective of the topology's current state to go out of sync with
reality. While it's tough to really know for sure what's happening to
the dock, using userspace tools to write to DP_MSTM_CTRL in the middle
of the MST link probing process does appear to make things flaky. It's
possible that when we write to DP_MSTM_CTRL, the function that gets
triggered to respond in the dock's firmware temporarily puts it in a
state where it might end up not reporting an ESI to the source, or ends
up dropping a sideband message we sent it.

So, to fix this we make it so that when probing an MST topology, we
respect it's current state. If the dock's already enabled, we simply
read DP_MSTM_CTRL and disable the topology if it's value is not what we
expected. Otherwise, we perform the normal MST probing dance. We avoid
taking any action except if the state of the MST topology actually
changes.

This fixes MST sideband message timeouts and detection failures on my
P50 with its ThinkPad dock.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: stable@vger.kernel.org
Cc: Karol Herbst <karolherbst@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
2018-09-07 06:54:26 +10:00
..
amd amdgpu and panel/misc fixes. 2018-08-24 09:22:54 -07:00
arc drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
arm drm/arm/hdlcd: Reject atomic commits that disable only the plane 2018-07-31 16:31:50 +01:00
armada drm/armada: remove obsolete fb unreferencing kfifo and workqueue 2018-07-30 11:53:06 +01:00
ast drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
atmel-hlcdc Merge v4.18-rc3 into drm-next 2018-07-04 10:27:12 +10:00
bochs drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
bridge drm pull for 4.19-rc1 2018-08-15 17:39:07 -07:00
cirrus drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
etnaviv Merge branch 'etnaviv/next' of https://git.pengutronix.de/git/lst/linux into drm-next 2018-08-08 06:07:30 +10:00
exynos drm/exynos/mixer: Remove unused local variable priv 2018-07-24 16:28:53 +09:00
fsl-dcu drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
gma500 drivers/gpu/drm/gma500/: change return type to vm_fault_t 2018-08-23 18:48:43 -07:00
hisilicon drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
i2c VLA leftovers pull summary: 2018-08-17 10:40:09 -07:00
i810 drm/i810: off by one in i810_dma_vertex() 2018-07-03 15:00:42 +02:00
i915 include/linux/compiler*.h: make compiler-*.h mutually exclusive 2018-08-22 17:31:34 -07:00
imx drm/imx: use suspend/resume helpers, add ipu-v3 V4L2 XRGB32/XBGR32 support 2018-08-10 11:13:36 +10:00
lib
mediatek Char/Misc driver patches for 4.19-rc1 2018-08-18 11:04:51 -07:00
meson drm/meson: Make DMT timings parameters and pixel clock generic 2018-07-16 11:14:59 +02:00
mga
mgag200 drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
msm drm/msm: a6xx: fix spelling mistake: "initalization" -> "initialization" 2018-08-10 18:49:18 -04:00
mxsfb
nouveau drm/nouveau: Only write DP_MSTM_CTRL when needed 2018-09-07 06:54:26 +10:00
omapdrm drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
panel drm/panel: simple: tv123wam: Add unprepare delay 2018-08-14 13:42:37 -04:00
pl111 drm/pl111: Use 64-bit arithmetic instead of 32-bit 2018-07-17 11:25:18 -07:00
qxl drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
r128
radeon mm, oom: distinguish blockable mode for mmu notifiers 2018-08-22 10:52:44 -07:00
rcar-du drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
rockchip drm/rockchip: Substitute is_yuv_support() with format->is_yuv 2018-07-18 16:59:27 +01:00
savage drm/savage: off by one in savage_bci_cmdbuf() 2018-07-04 14:27:01 +02:00
scheduler drm/scheduler: fix param documentation 2018-08-09 11:57:39 -05:00
selftests drm-misc-next for 4.19: 2018-06-22 12:58:08 +10:00
shmobile drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
sis
sti drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
stm drm/stm: Replace drm_dev_unref with drm_dev_put 2018-07-13 10:11:02 +02:00
sun4i Char/Misc driver patches for 4.19-rc1 2018-08-18 11:04:51 -07:00
tdfx
tegra drm pull for 4.19-rc1 2018-08-15 17:39:07 -07:00
tilcdc drm-misc-next for 4.19: 2018-07-20 10:46:49 +10:00
tinydrm drm/tinydrm: add backlight dependency for ili9341 2018-07-12 12:10:07 -05:00
ttm drm/ttm: clean up non-x86 definitions on ttm_tt 2018-08-01 17:23:56 -05:00
tve200
udl Merge branch 'drm-udl-next' of git://people.freedesktop.org/~airlied/linux into drm-next 2018-07-31 08:24:33 +10:00
v3d drm/scheduler: modify API to avoid redundancy 2018-07-25 15:06:19 -05:00
vc4 drm pull for 4.19-rc1 2018-08-15 17:39:07 -07:00
vgem drm/vgem: off by one in vgem_gem_fault() 2018-07-03 15:06:15 +02:00
via treewide: Use array_size() in vzalloc() 2018-06-12 16:19:22 -07:00
virtio drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
vkms drm/vkms: Fix connector leak at the module removal 2018-07-28 16:09:39 -03:00
vmwgfx Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax 2018-08-26 11:48:42 -07:00
xen drm-misc-next for 4.19: 2018-06-22 12:58:08 +10:00
zte drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
ati_pcigart.c
drm_agpsupport.c
drm_atomic_helper.c drm pull for 4.19-rc1 2018-08-15 17:39:07 -07:00
drm_atomic.c drm/atomic: Avoid connector to writeback_connector casts 2018-07-07 07:51:19 +02:00
drm_auth.c
drm_blend.c
drm_bridge.c
drm_bufs.c
drm_cache.c
drm_client.c drm/client: Fix double free in error path 2018-07-13 12:07:46 +02:00
drm_color_mgmt.c
drm_connector.c drm/connector: Fix typo in drm_connector_list_iter_next() 2018-07-16 13:18:09 -04:00
drm_context.c drm: re-enable error handling 2018-07-16 10:01:19 -04:00
drm_crtc_helper_internal.h
drm_crtc_helper.c
drm_crtc_internal.h drm: drop _mode_ from remaining connector functions 2018-07-13 18:40:27 +02:00
drm_crtc.c drm: Skip __drm_mode_set_config_internal() on atomic drivers 2018-07-13 17:58:19 +03:00
drm_debugfs_crc.c drm/crc: Only report a single overflow when a CRC fd is opened 2018-07-06 14:57:03 +02:00
drm_debugfs.c drm: drop _mode_ from update_edit_property() 2018-07-13 18:40:27 +02:00
drm_dma.c
drm_dp_aux_dev.c
drm_dp_cec.c drm_dp_cec.c: fix formatting typo: %pdH -> %phD 2018-07-28 15:50:40 -03:00
drm_dp_dual_mode_helper.c
drm_dp_helper.c drm/dp_helper: Add DP aux channel tracing 2018-07-16 11:47:53 -04:00
drm_dp_mst_topology.c drm: drop _mode_ from remaining connector functions 2018-07-13 18:40:27 +02:00
drm_drv.c drm/dp_helper: Add DP aux channel tracing 2018-07-16 11:47:53 -04:00
drm_dumb_buffers.c drm-misc-next for 4.19: 2018-06-28 13:29:07 +10:00
drm_edid_load.c
drm_edid.c drm/edid: Add 6 bpc quirk for SDC panel in Lenovo B50-80 2018-08-23 10:25:39 +02:00
drm_encoder_slave.c
drm_encoder.c
drm_fb_cma_helper.c drm/cma-helper: Remove drm_fb_cma_fbdev_init_with_funcs() 2018-07-10 14:54:50 +02:00
drm_fb_helper.c drm/fb-helper: Finish the generic fbdev emulation 2018-07-10 14:54:09 +02:00
drm_file.c drm: Begin an API for in-kernel clients 2018-07-10 14:51:37 +02:00
drm_flip_work.c
drm_fourcc.c drm/fourcc: Add is_yuv field to drm_format_info to denote if the format is yuv 2018-07-18 16:56:45 +01:00
drm_framebuffer.c drm: Add drm_plane_mask() 2018-07-02 18:45:55 +03:00
drm_gem_cma_helper.c
drm_gem_framebuffer_helper.c drm/gem-fb-helper: Always do implicit sync 2018-06-20 14:43:13 +02:00
drm_gem.c drm/i915: Prevent writing into a read-only object via a GGTT mmap 2018-07-13 16:14:04 +01:00
drm_global.c drm: add SPDX identifier and clarify license 2018-06-29 15:28:47 -05:00
drm_hashtab.c treewide: Use array_size() in vzalloc() 2018-06-12 16:19:22 -07:00
drm_info.c
drm_internal.h drm: provide management functions for drm_file 2018-06-25 16:17:03 +02:00
drm_ioc32.c
drm_ioctl.c drm: drop _mode_ from remaining connector functions 2018-07-13 18:40:27 +02:00
drm_irq.c
drm_kms_helper_common.c
drm_lease.c turn filp_clone_open() into inline wrapper for dentry_open() 2018-07-10 23:29:03 -04:00
drm_legacy.h
drm_lock.c
drm_memory.c treewide: Use array_size() in vmalloc() 2018-06-12 16:19:22 -07:00
drm_mipi_dsi.c drm: Add support for pps and compression mode command packet 2018-07-25 07:51:05 -04:00
drm_mm.c drm/mm: Add a search-by-address variant to only inspect a single hole 2018-05-24 15:04:30 +01:00
drm_mode_config.c drm: writeback: Add client capability for exposing writeback connectors 2018-06-20 15:30:20 +01:00
drm_mode_object.c drm: drop _mode_ from remaining connector functions 2018-07-13 18:40:27 +02:00
drm_modes.c drm: drop _mode_ from remaining connector functions 2018-07-13 18:40:27 +02:00
drm_modeset_helper.c
drm_modeset_lock.c drm: Change deadlock-avoidance algorithm for the modeset locks. 2018-07-03 09:46:05 +02:00
drm_of.c drm/doc: Include drm_of.c helpers 2018-07-13 18:40:28 +02:00
drm_panel_orientation_quirks.c
drm_panel.c drm/panel: Let of_drm_find_panel() return -ENODEV when the panel is disabled 2018-07-10 17:59:05 +02:00
drm_pci.c drm: drop drm_pcie_get_speed_cap_mask and drm_pcie_get_max_link_width 2018-07-05 16:40:00 -05:00
drm_plane_helper.c drm: add missing ctx argument to plane transitional helpers 2018-07-03 09:30:19 +02:00
drm_plane.c drm: Introduce __setplane_atomic() 2018-07-13 17:58:19 +03:00
drm_prime.c dma-buf: remove kmap_atomic interface 2018-06-20 15:59:34 +02:00
drm_print.c drm: Add puts callback for the coredump printer 2018-07-30 08:49:41 -04:00
drm_probe_helper.c drm: drop _mode_ from remaining connector functions 2018-07-13 18:40:27 +02:00
drm_property.c drm: Use kvzalloc for allocating blob property memory 2018-07-02 11:05:21 -05:00
drm_rect.c
drm_scatter.c
drm_scdc_helper.c
drm_simple_kms_helper.c drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
drm_syncobj.c drm: Remove unecessary dma_fence_ops 2018-07-03 13:13:22 +02:00
drm_sysfs.c
drm_trace_points.c
drm_trace.h
drm_vblank.c
drm_vm.c gpu: drm: drm_vm: Adding new typedef vm_fault_t 2018-05-29 08:58:46 +02:00
drm_vma_manager.c drm: add SPDX idenitifier and clarify license 2018-06-29 15:28:47 -05:00
drm_writeback.c drm: writeback: Fix doc that says connector should be disconnected 2018-07-16 16:35:27 +01:00
Kconfig drm: add support for DisplayPort CEC-Tunneling-over-AUX 2018-07-13 17:58:19 +03:00
Makefile drm: add support for DisplayPort CEC-Tunneling-over-AUX 2018-07-13 17:58:19 +03:00