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Wayne Lin 5a64967a2f drm/dp_mst: Have DP_Tx send one msg at a time 
[Why]
Noticed this while testing MST with the 4 ports MST hub from
StarTech.com. Sometimes can't light up monitors normally and get the
error message as 'sideband msg build failed'.

Look into aux transactions, found out that source sometimes will send
out another down request before receiving the down reply of the
previous down request. On the other hand, in drm_dp_get_one_sb_msg(),
current code doesn't handle the interleaved replies case. Hence, source
can't build up message completely and can't light up monitors.

[How]
For good compatibility, enforce source to send out one down request at a
time. Add a flag, is_waiting_for_dwn_reply, to determine if the source
can send out a down request immediately or not.

- Check the flag before calling process_single_down_tx_qlock to send out
a msg
- Set the flag when successfully send out a down request
- Clear the flag when successfully build up a down reply
- Clear the flag when find erros during sending out a down request
- Clear the flag when find errors during building up a down reply
- Clear the flag when timeout occurs during waiting for a down reply
- Use drm_dp_mst_kick_tx() to try to send another down request in queue
at the end of drm_dp_mst_wait_tx_reply() (attempt to send out messages
in queue when errors occur)

Cc: Lyude Paul <lyude@redhat.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/20200113093649.11755-1-Wayne.Lin@amd.com
 		2020-01-15 17:01:21 -05:00
..
bridge drm main pull for 5.5-rc1 2019-11-27 17:45:48 -08:00
i2c
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ttm Merge branch 'vmwgfx-coherent' of git://people.freedesktop.org/~thomash/linux into drm-next 2019-11-28 14:33:01 +10:00
amd_asic_type.h drm/amdgpu: Add a kernel parameter for specifying the asic type 2019-09-16 09:54:25 -05:00
ati_pcigart.h
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drm_agpsupport.h drm/agp: Remove unused function drm_agp_bind_pages 2019-07-15 18:11:30 +02:00
drm_atomic.h drm: Add helpers to kick off self refresh mode in drivers 2019-06-13 14:31:10 -04:00
drm_atomic_helper.h drm/atomic: Move __drm_atomic_helper_disable_plane/set_config() 2019-06-08 16:46:37 +02:00
drm_atomic_state_helper.h drm/atomic: Add a function to reset connector TV properties 2019-06-19 12:17:52 +02:00
drm_atomic_uapi.h drm: extract drm_atomic_uapi.c 2018-09-09 14:19:18 +02:00
drm_audio_component.h Prep patches + headers for the mei-hdcp/i915 component interfaces 2019-02-20 11:53:48 +02:00
drm_auth.h drm: make drm/drm_auth.h self contained 2019-05-27 18:05:44 +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: Fix references to drm_bridge_funcs in documentation 2019-09-13 14:10:48 +02:00
drm_cache.h MIPS: Loongson64: Rename CPU TYPES 2019-10-31 15:03:10 -07:00
drm_client.h drm/client: Support unmapping of DRM client buffers 2019-08-01 15:01:22 +02:00
drm_color_mgmt.h drm: Constify drm_color_lut_check() 2019-01-29 23:26:12 +02:00
drm_connector.h drm: Add DisplayPort colorspace property creation function 2019-09-20 18:46:18 +03:00
drm_crtc.h Merge drm/drm-next into drm-misc-next 2019-10-03 16:38:50 +02:00
drm_crtc_helper.h drm: Split out drm_probe_helper.h 2019-01-24 13:20:42 +01:00
drm_damage_helper.h drm/damage-helper: Add drm_atomic_helper_damage_merged() 2019-01-17 10:56:54 +01:00
drm_debugfs.h drm: drm_debugfs.h self-contained 2019-06-10 22:30:24 +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: Integrate VRAM MM into struct drm_device 2019-05-15 16:17:06 +02:00
drm_displayid.h drm/edid: parse CEA blocks embedded in DisplayID 2019-06-25 14:32:26 +10:00
drm_dp_dual_mode_helper.h
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drm_dp_helper.h drm/tegra: Move drm_dp_link helpers to Tegra DRM 2019-10-23 18:22:10 +02:00
drm_dp_mst_helper.h drm/dp_mst: Have DP_Tx send one msg at a time 2020-01-15 17:01:21 -05:00
drm_drv.h drm/print: move drm_debug variable to drm_print.[ch] 2019-10-02 16:28:24 +03:00
drm_dsc.h drm/dsc: Split DSC PPS and SDP header initialisations 2019-03-05 13:24:34 -05:00
drm_edid.h drm/edid: Add drm_hdmi_avi_infoframe_bars() 2019-10-22 19:11:11 +03:00
drm_encoder.h drm/encoder: Don't raise voice in drm_encoder_mask() documentation 2019-09-17 13:58:18 -04:00
drm_encoder_slave.h drm: remove include of drmP.h from drm_encoder_slave.h 2019-01-09 22:35:35 +01:00
drm_fb_cma_helper.h drm/cma-helper: Remove unused fbdev code 2019-01-17 10:56:38 +01:00
drm_fb_helper.h drm/fb-helper: Remove drm_fb_helper_defio_init() and update docs 2019-10-28 10:07:54 +01:00
drm_file.h drm/legacy: remove some legacy lock struct members 2019-04-24 12:36:32 +10:00
drm_fixed.h
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drm_flip_work.h
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drm_format_helper.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
drm_fourcc.h drm/fourcc: Fix the parameters name in the documentation 2019-05-21 16:58:05 +02:00
drm_framebuffer.h drm/fb: document dirty helper better 2019-06-11 18:02:48 +02:00
drm_gem.h drm/gem: Fix mmap fake offset handling for drm_gem_object_funcs.mmap 2019-10-29 13:29:21 -05:00
drm_gem_cma_helper.h drm: remove drmP.h from drm_gem_cma_helper.h 2019-01-09 22:54:08 +01:00
drm_gem_framebuffer_helper.h drm/fb: remove unused function: drm_gem_fbdev_fb_create() 2019-07-21 19:32:38 +02:00
drm_gem_shmem_helper.h Linux 5.4-rc7 2019-11-14 05:53:10 +10:00
drm_gem_ttm_helper.h drm/ttm: add drm_gem_ttm_mmap() 2019-10-17 13:59:16 +02:00
drm_gem_vram_helper.h drm/vram-helpers: Add helpers for prepare_fb() and cleanup_fb() 2019-10-24 16:12:11 +02:00
drm_hashtab.h
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drm_hdcp.h drm/hdcp: update content protection property with uevent 2019-08-06 13:17:23 +05:30
drm_ioctl.h drm/ioctl: Ditch DRM_UNLOCKED except for the legacy vblank ioctl 2019-06-21 19:13:10 +02:00
drm_irq.h
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drm_lease.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
drm_legacy.h drm: make drm/drm_legacy.h self-contained 2019-05-27 18:06:15 +02:00
drm_mipi_dbi.h drm/tinydrm: Move mipi-dbi 2019-07-25 10:45:07 +02:00
drm_mipi_dsi.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
drm_mm.h drm/mm: Convert drm_mm_node booleans to bitops 2019-10-04 13:43:13 +01:00
drm_mode_config.h drm: Add Content protection type property 2019-08-06 13:14:07 +05:30
drm_mode_object.h drm: remove drm_mode_object_{un/reference} aliases 2018-03-19 09:09:46 -04:00
drm_modes.h drm/selftests: reduce stack usage 2019-07-01 09:50:58 +02:00
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/connector: Share with non-atomic drivers the function to get the single encoder 2019-09-16 15:13:02 -07:00
drm_modeset_lock.h drm: Add drm_modeset_lock_assert_held() 2019-09-19 21:37:59 +03:00
drm_of.h drm: of: Export and rename drm_crtc_port_mask() 2018-06-27 21:44:04 +02:00
drm_panel.h drm/panel: Add and fill drm_panel type field 2019-09-08 19:04:01 +02:00
drm_pci.h drm: drop drm_pcie_get_speed_cap_mask and drm_pcie_get_max_link_width 2018-07-05 16:40:00 -05:00
drm_pciids.h drm/radeon: change SPDX identifier to MIT 2018-10-15 16:16:12 -05:00
drm_plane.h drm/plane: Clarify our expectations for src/dst rectangles 2019-10-10 15:49:34 +02:00
drm_plane_helper.h drm: Unexport drm_plane_helper_check_update 2018-10-05 22:45:19 +02:00
drm_prime.h drm/prime: Remove duplicate forward declaration 2019-09-16 17:32:51 +02:00
drm_print.h drm/print: add drm_debug_enabled() 2019-10-02 16:28:55 +03:00
drm_probe_helper.h drm: Split out drm_probe_helper.h 2019-01-24 13:20:42 +01:00
drm_property.h drm: Fix kernel doc for DRM_MODE_PROP_IMMUTABLE 2018-10-03 13:05:12 -07:00
drm_rect.h drm/rect: Add drm_rect_init() 2019-10-01 17:45:20 +03:00
drm_scdc_helper.h
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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: Standardize arguments for callbacks 2019-10-24 13:55:56 +02:00
drm_syncobj.h drm/syncobj: add new drm_syncobj_add_point interface v4 2019-04-01 12:05:53 +02:00
drm_sysfs.h drm: uevent for connector status change 2019-08-06 13:16:54 +05:30
drm_util.h drm: fix drm_can_sleep() comment 2019-01-21 10:30:12 +01:00
drm_utils.h drm: export drm_timeout_abs_to_jiffies 2019-03-07 12:00:30 -06:00
drm_vblank.h drm/vblank: Document and fix vblank count barrier semantics 2019-09-03 17:16:53 +02:00
drm_vma_manager.h drm: increase drm mmap_range size to 1TB 2019-04-24 16:20:23 -05:00
drm_writeback.h drm: writeback: Add job prepare and cleanup operations 2019-03-18 17:24:38 +02:00
gma_drm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 335 2019-06-05 17:37:06 +02:00
gpu_scheduler.h drm/sched: struct completion requires linux/completion.h inclusion 2019-11-08 12:29:52 -05:00
i915_component.h drm/i915/tgl: Add additional ports for Tiger Lake 2019-07-11 16:31:14 -07:00
i915_drm.h drm: Move port definition back to i915 header 2019-08-30 14:08:26 +05:30
i915_mei_hdcp_interface.h drm: Extend I915 mei interface for transcoder info 2019-08-30 14:08:28 +05:30
i915_pciids.h drm/i915/cml: Add Missing PCI IDs 2019-08-15 12:55:54 -07:00
intel-gtt.h drm: include kernel.h and agp_backend.h from intel-gtt.h 2019-01-02 11:37:47 +02:00
intel_lpe_audio.h
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spsc_queue.h
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