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3b7bbb3619
linux/drivers/gpu/drm
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Imre Deak 3b7bbb3619 drm/i915/dp: Prevent setting the LTTPR LT mode if no LTTPRs are detected 
Atm, the driver programs explicitly the default transparent link
training mode (0x55) to DP_PHY_REPEATER_MODE even if no LTTPRs are
detected.

This conforms to the spec (3.6.6.1):
"DP upstream devices that do not enable the Non-transparent mode of
 LTTPRs shall program the PHY_REPEATER_MODE register (DPCD Address
 F0003h) to 55h (default) prior to link training"

however writing the default value to this DPCD register seems to cause
occasional link training errors at least for a DELL WD19TB TBT dock, when
no LTTPRs are detected.

Writing to DP_PHY_REPEATER_MODE will also cause an unnecessary timeout
on systems without any LTTPR.

To fix the above two issues let's assume that setting the default mode
is redundant when no LTTPRs are detected. Keep the existing behavior and
program the default mode if more than 8 LTTPRs are detected or in case
the read from DP_PHY_REPEATER_CNT returns an invalid value.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/2801
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Khaled Almahallawy <khaled.almahallawy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210118183143.1145707-1-imre.deak@intel.com
2021-01-29 22:00:07 +02:00
..
amd Merge tag 'amd-drm-next-5.12-2021-01-08' of https://gitlab.freedesktop.org/agd5f/linux into drm-next 2021-01-15 09:05:32 +10:00
arc drm: Constify drm_driver in drivers that don't modify it 2021-01-05 07:20:36 +02:00
arm drm-misc-next for v5.12: 2021-01-07 10:46:32 +01:00
armada drm: automatic legacy gamma support 2020-12-15 15:46:03 +02:00
aspeed drm/<drivers>: Constify struct drm_driver 2020-11-06 10:31:26 +01:00
ast drm: automatic legacy gamma support 2020-12-15 15:46:03 +02:00
atmel-hlcdc drm: automatic legacy gamma support 2020-12-15 15:46:03 +02:00
bochs drm/fb_helper: Support framebuffers in I/O memory 2020-11-09 09:20:00 +01:00
bridge - Add default modes for connectors in unknown state 2021-01-07 13:02:57 +01:00
etnaviv Merge drm/drm-next into drm-misc-next 2020-12-15 11:05:43 +01:00
exynos drm for 5.11-rc1 2020-12-14 11:07:56 -08:00
fsl-dcu drm/<drivers>: Constify struct drm_driver 2020-11-06 10:31:26 +01:00
gma500 Merge drm/drm-next into drm-misc-next 2020-12-15 11:05:43 +01:00
hisilicon drm/hisilicon: Remove drm_dev_put in hibmc 2020-12-23 08:20:28 -05:00
i2c sound updates for 5.9 2020-08-06 14:27:31 -07:00
i810 drm/i810: make i810_flush_queue() return void 2020-09-11 10:54:17 +02:00
i915 drm/i915/dp: Prevent setting the LTTPR LT mode if no LTTPRs are detected 2021-01-29 22:00:07 +02:00
imx drm/imx: ipuv3-crtc: use drm managed resources 2021-01-04 12:59:34 +01:00
ingenic drm: automatic legacy gamma support 2020-12-15 15:46:03 +02:00
kmb - Add default modes for connectors in unknown state 2021-01-07 13:02:57 +01:00
lib
lima UAPI Changes: 2020-12-18 12:38:28 -08:00
mcde drm-misc-next for 5.11: 2020-12-15 10:21:48 +01:00
mediatek drm-misc-next for v5.12: 2021-01-07 10:46:32 +01:00
meson drm/meson: dw-hdmi: Enable the iahb clock early enough 2020-11-20 16:41:10 +01:00
mga drm/mga/mga_state: Remove unused variable 'buf_priv' 2020-11-06 23:19:07 +01:00
mgag200 drm/shmem-helper: Removed drm_gem_shmem_create_object_cached() 2020-11-24 09:10:33 +01:00
msm drm/msm/dp: fix build after dp quirk helper change 2021-01-21 15:11:21 +02:00
mxsfb Short summary of fixes pull (less than what git shortlog provides): 2020-12-15 17:25:55 +01:00
nouveau drm-misc-next for v5.12: 2021-01-07 10:46:32 +01:00
omapdrm drm/omap: Delete useless kfree code 2020-12-15 17:19:54 +02:00
panel drm/panel: s6e63m0: Support max-brightness 2020-12-30 11:26:08 +01:00
panfrost UAPI Changes: 2020-12-18 12:38:28 -08:00
pl111 drm/cma-helper: Implement mmap as GEM CMA object functions 2020-11-30 13:38:27 +01:00
qxl drm-misc-next for v5.12: 2021-01-07 13:40:20 +01:00
r128 drm/r128/ati_pcigart: Source file headers are not good candidates for kernel-doc 2020-11-06 23:18:52 +01:00
radeon Merge tag 'amd-drm-next-5.12-2021-01-08' of https://gitlab.freedesktop.org/agd5f/linux into drm-next 2021-01-15 09:05:32 +10:00
rcar-du - Add default modes for connectors in unknown state 2021-01-07 13:02:57 +01:00
rockchip drm: automatic legacy gamma support 2020-12-15 15:46:03 +02:00
savage drm/savage/savage_bci: Remove set but never used 'aper_rsrc' and 'fb_rsrc' 2020-11-12 20:31:01 +01:00
scheduler Merge drm/drm-next into drm-misc-next 2020-12-15 11:05:43 +01:00
selftests drm/selftests/test-drm_dp_mst_helper: Move 'sideband_msg_req_encode_decode' onto the heap 2020-11-17 20:08:29 +01:00
shmobile drm/<drivers>: Constify struct drm_driver 2020-11-06 10:31:26 +01:00
sis
sti drm: sti: Remove unnecessary drm_plane_cleanup() wrapper 2021-01-05 07:20:21 +02:00
stm drm: automatic legacy gamma support 2020-12-15 15:46:03 +02:00
sun4i ARM: SoC drivers for v5.11 2020-12-16 16:38:41 -08:00
tdfx drm: Constify drm_driver in drivers that don't modify it 2021-01-05 07:20:36 +02:00
tegra drm for 5.11-rc1 2020-12-14 11:07:56 -08:00
tidss drm/tidss: use devm_platform_ioremap_resource_byname 2020-11-10 14:34:16 +02:00
tilcdc drm/<drivers>: Constify struct drm_driver 2020-11-06 10:31:26 +01:00
tiny drm/gem: Use struct dma_buf_map in GEM vmap ops and convert GEM backends 2020-11-09 09:19:24 +01:00
ttm drm-misc-next for v5.12: 2021-01-07 10:46:32 +01:00
tve200 drm/tve200: remove unused including <linux/version.h> 2020-12-30 11:25:05 +01:00
udl drm/shmem-helper: Removed drm_gem_shmem_create_object_cached() 2020-11-24 09:10:33 +01:00
v3d drm/shmem-helper: Use cached mappings by default 2020-11-24 09:10:21 +01:00
vboxvideo drm/gem: Use struct dma_buf_map in GEM vmap ops and convert GEM backends 2020-11-09 09:19:24 +01:00
vc4 - Add default modes for connectors in unknown state 2021-01-07 13:02:57 +01:00
vgem drm/prime: split array import functions v4 2020-11-30 15:00:45 +01:00
via via/via_irq: use __func__ to replace string function name 2020-11-27 16:14:02 +01:00
virtio drm/virtio: align blob resources to page sizes 2020-12-22 13:43:30 +01:00
vkms drm/vkms: Unset preferred_depth 2020-12-11 17:16:55 +01:00
vmwgfx drm/ttm: cleanup BO size handling v3 2020-12-14 14:20:46 +01:00
xen drm/prime: split array import functions v4 2020-11-30 15:00:45 +01:00
xlnx drm/<drivers>: Constify struct drm_driver 2020-11-06 10:31:26 +01:00
zte drm: zte: Remove unnecessary drm_plane_cleanup() wrapper 2021-01-05 07:20:24 +02:00
drm_agpsupport.c
drm_atomic_helper.c drm: automatic legacy gamma support 2020-12-15 15:46:03 +02:00
drm_atomic_state_helper.c drm: fix some kernel-doc markups 2020-11-16 20:48:20 +01:00
drm_atomic_uapi.c drm: fix oops in drm_atomic_set_crtc_for_connector 2020-11-16 09:56:55 +01:00
drm_atomic.c Merge branch 'akpm' (patches from Andrew) 2020-12-15 12:53:37 -08:00
drm_auth.c
drm_blend.c drm/doc: introduce new section for standard plane properties 2020-12-17 16:56:40 +01:00
drm_bridge_connector.c gpu/drm: delete same check in if condition 2020-11-02 14:04:53 +01:00
drm_bridge.c
drm_bufs.c drm: Fix fall-through warnings for Clang 2020-11-22 22:58:54 +01:00
drm_cache.c drm: core: fix common struct sg_table related issues 2020-09-10 08:17:48 +02:00
drm_client_modeset.c
drm_client.c drm/client: Depend on GEM object kmap ref-counting 2020-11-24 09:27:54 +01:00
drm_color_mgmt.c drm: add legacy support for using degamma for gamma 2020-12-15 15:46:03 +02:00
drm_connector.c drm: fix some kernel-doc markups 2020-11-16 20:48:20 +01:00
drm_context.c
drm_crtc_helper_internal.h
drm_crtc_helper.c
drm_crtc_internal.h drm: Introduce plane and CRTC scaling filter properties 2020-10-21 12:19:54 +03:00
drm_crtc.c drm/imx: fixes and drm managed resources 2021-01-07 11:24:50 +01:00
drm_damage_helper.c
drm_debugfs_crc.c drm/crc-debugfs: Fix memleak in crc_control_write 2020-09-01 09:45:44 +02:00
drm_debugfs.c
drm_dma.c
drm_dp_aux_dev.c drm/dp_aux_dev: check aux_dev before use in drm_dp_aux_dev_get_by_minor() 2020-10-15 13:58:54 -04:00
drm_dp_cec.c
drm_dp_dual_mode_helper.c
drm_dp_helper.c drm/dp: Revert "drm/dp: Introduce EDID-based quirks" 2021-01-19 12:35:52 -05:00
drm_dp_mst_topology_internal.h
drm_dp_mst_topology.c drm/dp/mst: Export drm_dp_get_vc_payload_bw() 2021-01-28 21:34:02 +02:00
drm_drv.c - Add default modes for connectors in unknown state 2021-01-07 13:02:57 +01:00
drm_dsc.c drm/dsc: add helper for calculating rc buffer size from DPCD 2020-12-10 10:49:47 +02:00
drm_dumb_buffers.c drm: Don't export the drm_gem_dumb_destroy() function 2021-01-05 07:20:25 +02:00
drm_edid_load.c
drm_edid.c Merge tag 'topic/dp-hdmi-2.1-pcon-2020-12-23' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-01-07 11:02:25 +01:00
drm_encoder_slave.c
drm_encoder.c drm: add drmm_encoder_alloc() 2021-01-04 12:59:33 +01:00
drm_fb_cma_helper.c
drm_fb_helper.c drm/fb-helper: Add a FIXME that generic_setup is very confusing 2020-12-22 12:17:37 +01:00
drm_file.c drm/cma-helper: Implement mmap as GEM CMA object functions 2020-11-30 13:38:27 +01:00
drm_flip_work.c
drm_format_helper.c
drm_fourcc.c drm/fourcc: Add AXBXGXRX106106106106 format 2020-10-20 20:51:42 +01:00
drm_framebuffer.c drm: fix some kernel-doc markups 2020-11-16 20:48:20 +01:00
drm_gem_cma_helper.c drm/cma-helper: Implement mmap as GEM CMA object functions 2020-11-30 13:38:27 +01:00
drm_gem_framebuffer_helper.c
drm_gem_shmem_helper.c drm/shmem-helper: Removed drm_gem_shmem_create_object_cached() 2020-11-24 09:10:33 +01:00
drm_gem_ttm_helper.c drm/ttm: Add vmap/vunmap to TTM and TTM GEM helpers 2020-11-09 09:17:36 +01:00
drm_gem_vram_helper.c drm/vram-helper: Fix use of top-down placement 2020-11-20 05:20:48 +10:00
drm_gem.c drm: Don't export the drm_gem_dumb_destroy() function 2021-01-05 07:20:25 +02:00
drm_hashtab.c
drm_hdcp.c
drm_internal.h drm: Don't export the drm_gem_dumb_destroy() function 2021-01-05 07:20:25 +02:00
drm_ioc32.c
drm_ioctl.c drm: Give irq_by_busid drm_legacy_ prefix 2020-10-21 18:05:11 +02:00
drm_irq.c drm/irq: Add the new api to install irq 2020-12-03 03:57:15 -05:00
drm_kms_helper_common.c
drm_lease.c
drm_legacy_misc.c
drm_legacy.h
drm_lock.c
drm_managed.c drm/dev: Remove drm_dev_init 2020-09-21 10:45:08 +02:00
drm_memory.c
drm_mipi_dbi.c Linux 5.8 2020-08-11 11:58:31 +10:00
drm_mipi_dsi.c
drm_mm.c
drm_mode_config.c drm-misc-next for v5.12: 2021-01-07 13:40:20 +01:00
drm_mode_object.c drm: fix some kernel-doc markups 2020-11-16 20:48:20 +01:00
drm_modes.c drm: fix some kernel-doc markups 2020-11-16 20:48:20 +01:00
drm_modeset_helper.c
drm_modeset_lock.c
drm_of.c Linux 5.8 2020-08-11 11:58:31 +10:00
drm_panel_orientation_quirks.c drm: Added orientation quirk for ASUS tablet model T103HAF 2020-08-04 11:45:23 +02:00
drm_panel.c drm/panel: Add helper for reading DT rotation 2020-08-16 17:12:18 +02:00
drm_pci.c drm: Use a const drm_driver for legacy PCI devices 2021-01-05 07:20:35 +02:00
drm_plane_helper.c
drm_plane.c drm-misc-next for v5.12: 2021-01-07 13:40:20 +01:00
drm_prime.c drm/prime: split array import functions v4 2020-11-30 15:00:45 +01:00
drm_print.c
drm_probe_helper.c drm: Add default modes for connectors in unknown state 2021-01-05 07:19:50 +02:00
drm_property.c
drm_rect.c
drm_scatter.c
drm_scdc_helper.c drm: fix some kernel-doc markups 2020-11-16 20:48:20 +01:00
drm_self_refresh_helper.c
drm_simple_kms_helper.c drm/simple_kms_helper: add drmm_simple_encoder_alloc() 2021-01-04 12:59:33 +01:00
drm_syncobj.c drm/syncobj: Tune down unordered timeline DRM_ERROR 2020-08-02 15:22:31 +02:00
drm_sysfs.c
drm_trace_points.c
drm_trace.h
drm_vblank_work.c This tree adds the sched_set_fifo*() encapsulation APIs to remove 2020-08-06 11:55:43 -07:00
drm_vblank.c drm: Compile out legacy chunks from struct drm_device 2020-11-06 10:31:26 +01:00
drm_vm.c drm: remove pgprot_decrypted() before calls to io_remap_pfn_range() 2020-11-10 17:19:14 +01:00
drm_vma_manager.c
drm_writeback.c
Kconfig drm/gem: Use struct dma_buf_map in GEM vmap ops and convert GEM backends 2020-11-09 09:19:24 +01:00
Makefile drm/kmb: Build files for KeemBay Display driver 2020-11-05 19:20:38 +01:00