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0cbd0adc44
linux/drivers/gpu/drm
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Mario Kleiner 0cbd0adc44 drm: Fix timestamp docs for variable refresh properties. 
As discussed with Nicholas and Daniel Vetter (patchwork
link to discussion below), the VRR timestamping behaviour
produced utterly useless and bogus vblank/pageflip
timestamps. We have found a way to fix this and provide
sane behaviour.

As of Linux 5.2, the amdgpu driver will be able to
provide exactly the same vblank / pageflip timestamp
semantic in variable refresh rate mode as in standard
fixed refresh rate mode. This is achieved by deferring
core vblank handling (drm_crtc_handle_vblank()) until
the end of front porch, and also defer the sending of
pageflip completion events until end of front porch,
when we can safely compute correct pageflip/vblank
timestamps.

The same approach will be possible for other VRR
capable kms drivers, so we can actually have sane
and useful timestamps in VRR mode.

This patch removes the section of the docs that
describes the broken timestamp behaviour present
in Linux 5.0/5.1.

Fixes: ab7a664f7a ("drm: Document variable refresh properties")
Link: https://patchwork.freedesktop.org/patch/285333/
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190418060157.18968-1-mario.kleiner.de@gmail.com
Cc: stable@vger.kernel.org
2019-05-07 10:39:14 -05:00
..
amd drm: prefix header search paths with $(srctree)/ 2019-04-26 17:03:23 +02:00
arc drm: Split out drm_probe_helper.h 2019-01-24 13:20:42 +01:00
arm drm: prefix header search paths with $(srctree)/ 2019-04-26 17:03:23 +02:00
armada drm/armada: Use drm_fb_helper_fill_info 2019-03-27 09:56:14 +01:00
aspeed drm: aspeed: Clean up Kconfig options 2019-04-16 16:39:24 +02:00
ast Merge branch 'drm-next-5.2' of git://people.freedesktop.org/~agd5f/linux into drm-next 2019-04-03 13:26:11 +10:00
atmel-hlcdc drm/irq: Don't check for DRIVER_HAVE_IRQ in drm_irq_(un)install 2019-01-29 15:45:06 +01:00
bochs Merge drm/drm-next into drm-misc-next 2019-04-10 15:50:49 -04:00
bridge drm-misc-next for v5.2: 2019-04-24 10:12:50 +10:00
cirrus drm-misc-next for 5.2: 2019-04-12 14:27:45 +10:00
etnaviv drm-misc-next for 5.2: 2019-03-25 11:05:12 +01:00
exynos drm/ipp: clean up debug messages 2019-04-24 11:23:20 +09:00
fsl-dcu drm: Use new DRM_BUS_FLAG_*_(DRIVE|SAMPLE)_(POS|NEG)EDGE flags 2019-03-18 11:42:13 +02:00
gma500 drm/gma500: Use drm_fb_helper_fill_info 2019-03-27 09:57:28 +01:00
hisilicon Merge branch 'drm-next-5.2' of git://people.freedesktop.org/~agd5f/linux into drm-next 2019-04-03 13:26:11 +10:00
i2c drm: Split out drm_probe_helper.h 2019-01-24 13:20:42 +01:00
i810
i915 drm: prefix header search paths with $(srctree)/ 2019-04-26 17:03:23 +02:00
imx drm-misc-next for 5.2: 2019-03-25 11:05:12 +01:00
lib
lima drm/lima: Make lima_sched_ops static 2019-04-17 20:56:40 +08:00
mediatek drm/mediatek: no change parent rate in round_rate() for MT2701 hdmi phy 2019-04-09 17:47:01 +08:00
meson drm-misc-next for v5.2: 2019-04-24 10:12:50 +10:00
mga drm/irq: Ditch DRIVER_IRQ_SHARED 2019-01-29 15:45:21 +01:00
mgag200 Merge branch 'drm-next-5.2' of git://people.freedesktop.org/~agd5f/linux into drm-next 2019-04-03 13:26:11 +10:00
msm drm: prefix header search paths with $(srctree)/ 2019-04-26 17:03:23 +02:00
mxsfb drm: Use new DRM_BUS_FLAG_*_(DRIVE|SAMPLE)_(POS|NEG)EDGE flags 2019-03-18 11:42:13 +02:00
nouveau drm: prefix header search paths with $(srctree)/ 2019-04-26 17:03:23 +02:00
omapdrm Linux 5.1-rc5 2019-04-15 15:51:49 +10:00
panel drm/panel: simple: add lg,acx467akm-7 panel 2019-04-17 23:02:44 +02:00
panfrost drm/panfrost: Show stored feature registers 2019-05-03 15:36:23 -05:00
pl111 drm-misc-next for 5.2: 2019-04-12 14:27:45 +10:00
qxl Merge branch 'drm-next-5.2' of git://people.freedesktop.org/~agd5f/linux into drm-next 2019-04-03 13:26:11 +10:00
r128 drm/irq: Ditch DRIVER_IRQ_SHARED 2019-01-29 15:45:21 +01:00
radeon Merge branch 'drm-next-5.2' of git://people.freedesktop.org/~agd5f/linux into drm-next 2019-04-03 13:26:11 +10:00
rcar-du drm: rcar-du: lvds: Set LVEN and LVRES bits together on D3 2019-03-28 06:12:42 +02:00
rockchip Tagging commit at head of panfrost fixes (+ rockchip fix) that need to go into 2019-05-03 15:39:37 -04:00
savage drm/savage: mark expected switch fall-throughs 2019-01-30 17:35:29 +01:00
scheduler Merge branch 'drm-next-5.1' of git://people.freedesktop.org/~agd5f/linux into drm-next 2019-02-22 15:56:42 +10:00
selftests drm/selftests/mm: Switch to bitmap_zalloc() 2019-03-20 17:36:06 +00:00
shmobile drm/irq: Don't check for DRIVER_HAVE_IRQ in drm_irq_(un)install 2019-01-29 15:45:06 +01:00
sis
sti drm: Split out drm_probe_helper.h 2019-01-24 13:20:42 +01:00
stm drm/stm: add sleep power management 2019-04-01 11:00:18 +02:00
sun4i drm-misc-next for v5.2: 2019-04-24 10:12:50 +10:00
tdfx
tegra drm/tegra: Changes for v5.2-rc1 2019-04-24 10:30:45 +10:00
tilcdc drm/irq: Don't check for DRIVER_HAVE_IRQ in drm_irq_(un)install 2019-01-29 15:45:06 +01:00
tinydrm drm/tinydrm: Fix fbdev pixel format 2019-04-11 16:16:06 +02:00
ttm drm/ttm: Fix spelling of "KiB" 2019-03-19 15:04:03 -05:00
tve200 drm: Use new DRM_BUS_FLAG_*_(DRIVE|SAMPLE)_(POS|NEG)EDGE flags 2019-03-18 11:42:13 +02:00
udl drm/udl: move to embedding drm device inside udl device. 2019-04-24 13:48:45 +10:00
v3d drm/v3d: fix a missing check of pm_runtime_get_sync 2019-04-01 10:45:59 -07:00
vboxvideo Merge branch 'drm-next-5.2' of git://people.freedesktop.org/~agd5f/linux into drm-next 2019-04-03 13:26:11 +10:00
vc4 drm-misc-next for 5.2: 2019-04-12 14:27:45 +10:00
vgem drm/vgem: fix use-after-free when drm_gem_handle_create() fails 2019-03-18 08:45:57 +01:00
via drm/via: mark expected switch fall-throughs 2019-01-30 17:35:29 +01:00
virtio drm-misc-next for 5.2: 2019-04-05 11:38:02 +10:00
vkms Linux 5.1-rc5 2019-04-15 15:51:49 +10:00
vmwgfx drm/vmwgfx: Remove set but not used variable 'fb_offset, fb_depth' 2019-04-08 10:29:05 -07:00
xen drm/drv: drm_dev_unplug(): Move out drm_dev_put() call 2019-02-21 12:11:58 +01:00
zte drm: Split out drm_probe_helper.h 2019-01-24 13:20:42 +01:00
ati_pcigart.c drm/ati_pcigart: Fix error code in drm_ati_pcigart_init() 2018-12-17 10:47:17 +01:00
drm_agpsupport.c drm: Trivial comment grammar cleanups 2019-02-04 10:21:17 +01:00
drm_atomic_helper.c Linux 5.1-rc5 2019-04-15 15:51:49 +10:00
drm_atomic_state_helper.c drm: writeback: Fix leak of writeback job 2019-03-18 17:24:32 +02:00
drm_atomic_uapi.c drm/atomic: -EACCESS for lease-denied crtc lookup 2019-04-24 11:31:17 +02:00
drm_atomic.c drm-misc-next for 5.1: 2019-01-10 05:58:52 +10:00
drm_auth.c drm/leases: Don't init to 0 in drm_master_create 2019-04-24 11:29:06 +02:00
drm_blend.c drm: Clarify DRM_MODE_REFLECT_X/Y documentation 2018-09-11 11:21:30 +01:00
drm_bridge.c drm: bridge: Constify mode arguments to bridge .mode_set() operation 2019-01-14 03:51:14 +02:00
drm_bufs.c drm: Trivial comment grammar cleanups 2019-02-04 10:21:17 +01:00
drm_cache.c
drm_client.c drm/client: Rename drm_client_add() to drm_client_register() 2019-04-11 16:14:49 +02:00
drm_color_mgmt.c drm: Constify drm_color_lut_check() 2019-01-29 23:26:12 +02:00
drm_connector.c drm: Fix timestamp docs for variable refresh properties. 2019-05-07 10:39:14 -05:00
drm_context.c drm: Fix error handling in drm_legacy_addctx 2019-01-07 11:26:31 +01:00
drm_crtc_helper_internal.h
drm_crtc_helper.c drm: Remove use of drm_mode_object 2019-01-15 13:20:56 +01:00
drm_crtc_internal.h drm/atomic: Wire file_priv through for property changes 2019-04-24 11:30:52 +02:00
drm_crtc.c drm/lease: Make sure implicit planes are leased 2019-04-24 11:30:32 +02:00
drm_damage_helper.c drm: prepare for drmP.h removal from drm_modeset_helper.h 2019-02-07 21:48:28 +01:00
drm_debugfs_crc.c
drm_debugfs.c drm: Merge drm_info.c into drm_debugfs.c 2018-11-22 09:52:27 +01:00
drm_dma.c
drm_dp_aux_dev.c
drm_dp_cec.c drm: Do not call drm_dp_cec_set_edid() while registering DP connectors 2018-10-11 10:52:35 +02:00
drm_dp_dual_mode_helper.c
drm_dp_helper.c drm/dsc: Add kernel documentation for DRM DP DSC helpers 2019-02-08 13:38:51 -08:00
drm_dp_mst_topology.c drm/dp: Set the connector's TILE property even for DP SST connectors 2019-03-14 11:33:17 -07:00
drm_drv.c drm/drv: Fix incorrect resolution of merge conflict 2019-04-18 06:42:22 +10:00
drm_dsc.c drm/dsc: Split DSC PPS and SDP header initialisations 2019-03-05 13:24:34 -05:00
drm_dumb_buffers.c
drm_edid_load.c
drm_edid.c drm/edid: Remove defunct EDID_QUIRK_FIRST_DETAILED_PREFERRED 2019-03-27 13:55:13 +02:00
drm_encoder_slave.c
drm_encoder.c drm: Differentiate the lack of an interface from invalid parameter 2018-09-14 17:29:47 +01:00
drm_fb_cma_helper.c drm/cma-helper: Remove unused fbdev code 2019-01-17 10:56:38 +01:00
drm_fb_helper.c drm/fb-helper: Fix drm_fb_helper_firmware_config() NULL pointer deref 2019-04-24 15:57:43 +02:00
drm_file.c drm: Fix drm_release() and device unplug 2019-03-25 15:58:05 +10:00
drm_flip_work.c drm: move drm_can_sleep() to drm_util.h 2019-01-14 10:58:37 +01:00
drm_format_helper.c drm: add drm_format_helper.c to kerneldoc 2019-04-17 09:39:22 +02:00
drm_fourcc.c drm/fourcc: Fix conflicting Y41x definitions 2019-03-21 09:49:04 +01:00
drm_framebuffer.c drm: Trivial comment grammar cleanups 2019-02-04 10:21:17 +01:00
drm_gem_cma_helper.c drm/cma-helper: Add DRM_GEM_CMA_VMAP_DRIVER_OPS 2018-11-20 14:57:25 +01:00
drm_gem_framebuffer_helper.c drm/gem-fb-helper: Add drm_gem_fb_create_with_dirty() 2019-01-17 10:56:45 +01:00
drm_gem_shmem_helper.c drm: shmem: Off by one in drm_gem_shmem_fault() 2019-04-01 10:44:34 -07:00
drm_gem.c drm/gem: Fix sphinx warnings 2019-04-25 10:02:10 -04:00
drm_hashtab.c
drm_internal.h drm/syncobj: add timeline signal ioctl for syncobj v5 2019-04-01 12:09:00 +02:00
drm_ioc32.c drm: add __user attribute to ptr_to_compat() 2019-03-04 09:55:31 -05:00
drm_ioctl.c Revert "drm: allow render capable master with DRM_AUTH ioctls" 2019-04-18 06:46:33 +10:00
drm_irq.c drm/irq: Ditch DRIVER_IRQ_SHARED 2019-01-29 15:45:21 +01:00
drm_kms_helper_common.c drm: fix spelling mistake "intead" -> "instead" 2019-03-04 11:18:50 -05:00
drm_lease.c drm/lease: Check for lessor outside of locks 2019-04-24 11:29:32 +02:00
drm_legacy.h
drm_lock.c drm: Differentiate the lack of an interface from invalid parameter 2018-09-14 17:29:47 +01:00
drm_memory.c drm: fallback to dma_alloc_coherent when memory encryption is active 2019-04-01 11:43:42 +02:00
drm_mipi_dsi.c
drm_mm.c drm: Trivial comment grammar cleanups 2019-02-04 10:21:17 +01:00
drm_mode_config.c drm: Expose "FB_DAMAGE_CLIPS" property to atomic aware user-space only 2019-04-16 15:13:23 -07:00
drm_mode_object.c drm/atomic: Wire file_priv through for property changes 2019-04-24 11:30:52 +02:00
drm_modes.c drm: Use new DRM_BUS_FLAG_*_(DRIVE|SAMPLE)_(POS|NEG)EDGE flags 2019-03-18 11:42:13 +02:00
drm_modeset_helper.c drm: prepare for drmP.h removal from drm_modeset_helper.h 2019-02-07 21:48:28 +01:00
drm_modeset_lock.c drm/atomic: integrate modeset lock with private objects 2018-12-11 15:24:30 +01:00
drm_of.c drm/of: Fix kerneldoc 2019-01-12 13:07:58 +01:00
drm_panel_orientation_quirks.c drm: panel-orientation-quirks: Add quirk for Lenovo Ideapad D330 2019-03-01 09:15:55 +02:00
drm_panel.c drm/panel: Small documentation polish 2019-01-12 13:08:12 +01:00
drm_pci.c cross-tree: phase out dma_zalloc_coherent() 2019-01-08 07:58:37 -05:00
drm_plane_helper.c drm: Unexport drm_plane_helper_check_update 2018-10-05 22:45:19 +02:00
drm_plane.c drm/lease: Make sure implicit planes are leased 2019-04-24 11:30:32 +02:00
drm_prime.c drm: Add reservation_object to drm_gem_object 2019-02-19 11:08:40 +01:00
drm_print.c drm: Add a helper function for printing a debugfs_regset32. 2019-04-01 10:44:34 -07:00
drm_probe_helper.c drm: Split out drm_probe_helper.h 2019-01-24 13:20:42 +01:00
drm_property.c drm: Trivial comment grammar cleanups 2019-02-04 10:21:17 +01:00
drm_rect.c drm: Nuke drm_calc_{h,v}scale_relaxed() 2019-02-07 13:14:06 +02:00
drm_scatter.c drm: Differentiate the lack of an interface from invalid parameter 2018-09-14 17:29:47 +01:00
drm_scdc_helper.c
drm_simple_kms_helper.c drm: Split out drm_probe_helper.h 2019-01-24 13:20:42 +01:00
drm_syncobj.c drm/syncobj: add timeline signal ioctl for syncobj v5 2019-04-01 12:09:00 +02:00
drm_sysfs.c drm/lease: Send a distinct uevent 2018-11-30 10:57:18 +01:00
drm_trace_points.c
drm_trace.h
drm_vblank.c drm: Trivial comment grammar cleanups 2019-02-04 10:21:17 +01:00
drm_vm.c drm/drm_vm: Mark expected switch fall-throughs 2019-02-19 12:20:41 +01:00
drm_vma_manager.c drm: Remove "protection" around drm_vma_offset_manager_destroy() 2018-09-04 19:00:32 +01:00
drm_writeback.c drm: writeback: Add job prepare and cleanup operations 2019-03-18 17:24:38 +02:00
Kconfig drm/panfrost: Add initial panfrost driver 2019-04-12 12:56:46 -05:00
Makefile drm/panfrost: Add initial panfrost driver 2019-04-12 12:56:46 -05:00