Douglas Anderson 6376eb8b91 drm/dp: Clarify that wait_hpd_asserted() is not optional for panels ... In response to my patch removing the "wait for HPD" logic at the beginning of the MSM DP transfer() callback [1], we had some debate about what the "This is an optional function" meant in the documentation of the wait_hpd_asserted() callback. Let's clarify. As talked about in the MSM DP patch [1], before wait_hpd_asserted() was introduced there was no great way for panel drivers to wait for HPD in the case that the "built-in" HPD signal was used. Panel drivers could only wait for HPD if a GPIO was used. At the time, we ended up just saying that if we were using the "built-in" HPD signal that DP AUX controllers needed to wait for HPD themselves at the beginning of their transfer() callback. The fact that the wait for HPD at the beginning of transfer() was awkward/problematic was the whole reason wait_hpd_asserted() was added. Let's make it obvious that if a DP AUX controller implements wait_hpd_asserted() that they don't need a loop waiting for HPD at the start of their transfer() function. We'll still allow DP controllers to work the old way but mark it as deprecated. [1] https://lore.kernel.org/r/20240315143621.v2.3.I535606f6d4f7e3e5588bb75c55996f61980183cd@changeid Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20240319135836.v2.1.I521dad0693cc24fe4dd14cba0c7048d94f5b6b41@changeid		2024-03-26 08:58:53 -07:00
..
bridge	drm: bridge: samsung-dsim: make samsung-dsim.h self-contained	2024-03-07 17:17:25 +02:00
display	drm/dp: Clarify that wait_hpd_asserted() is not optional for panels	2024-03-26 08:58:53 -07:00
i2c	drm/i2c: silence ch7006.h and sil164.h kernel-doc warnings	2024-03-11 14:29:19 +02:00
ttm	drm/ttm: warn when resv objs are mixed in a bulk_move	2024-03-20 11:18:10 +01:00
amd_asic_type.h	drm/amdgpu: make amd_asic_type.h self-contained	2024-03-07 17:17:25 +02:00
drm_accel.h	drm/debugfs: rework debugfs directory creation v5	2023-09-01 08:51:18 +02:00
drm_aperture.h	drm/aperture: Remove primary argument	2023-04-16 14:17:41 +02:00
drm_atomic_helper.h	drm-misc-next for $kernel-version:	2023-12-19 17:07:32 +10:00
drm_atomic_state_helper.h
drm_atomic_uapi.h
drm_atomic.h	drm/atomic: Make the drm_atomic_state documentation less ambiguous	2023-12-18 11:45:34 +01:00
drm_audio_component.h
drm_auth.h	drm: Remove source code for non-KMS drivers	2023-12-06 10:08:37 +01:00
drm_blend.h	Revert "drm: Introduce pixel_source DRM plane property"	2023-12-04 21:33:10 +02:00
drm_bridge_connector.h
drm_bridge.h	drm: Spelling s/hardward/hardware/g	2024-02-15 17:01:31 +01:00
drm_buddy.h	drm/buddy: Improve contiguous memory allocation	2023-09-11 20:18:00 +02:00
drm_cache.h
drm_client.h	drm/fbdev-generic: Fix locking with drm_client_buffer_vmap_local()	2024-03-11 13:33:50 +01:00
drm_color_mgmt.h	drm: using mul_u32_u32() requires linux/math64.h	2023-12-19 15:29:17 +02:00
drm_connector.h	drm: Add HPD state to drm_connector_oob_hotplug_event()	2023-10-11 13:20:22 +03:00
drm_crtc_helper.h
drm_crtc.h	drm: Remove references to removed transitional helpers	2023-07-29 21:25:16 +02:00
drm_damage_helper.h
drm_debugfs_crc.h	drm/crc: make drm_debugfs_crc.h self-contained and fix kernel-doc	2024-03-07 17:17:25 +02:00
drm_debugfs.h	drm/gpuvm: rename struct drm_gpuva_manager to struct drm_gpuvm	2023-09-26 01:51:28 +02:00
drm_device.h	drm: Remove source code for non-KMS drivers	2023-12-06 10:08:37 +01:00
drm_displayid.h
drm_drv.h	drm: Remove source code for non-KMS drivers	2023-12-06 10:08:37 +01:00
drm_edid.h	drm/edid: Add a function to match EDID with identity	2024-03-14 08:22:57 -07:00
drm_eld.h	drm/eld: add helpers to modify the SADs of an ELD	2023-11-09 16:48:27 +02:00
drm_encoder_slave.h	drm/encoder: improve drm_encoder_slave.h kernel-doc	2024-03-11 11:47:06 +02:00
drm_encoder.h	drm/encoder: register per-encoder debugfs dir	2023-12-04 16:07:29 +02:00
drm_exec.h	Merge drm/drm-next into drm-misc-next	2024-01-29 14:20:23 +01:00
drm_fb_dma_helper.h
drm_fb_helper.h	drm/fb-helper: Remove unused inline function drm_fb_helper_defio_init()	2023-07-25 20:38:37 +02:00
drm_fbdev_dma.h
drm_fbdev_generic.h
drm_file.h	drm: Remove source code for non-KMS drivers	2023-12-06 10:08:37 +01:00
drm_fixed.h	drm: Don't treat 0 as -1 in drm_fixp2int_ceil	2024-01-02 11:57:44 -01:00
drm_flip_work.h	drm: Fix flip-task docs	2023-11-14 10:23:12 +01:00
drm_format_helper.h	drm: fix drm_format_helper.h kernel-doc warnings	2024-03-07 17:17:25 +02:00
drm_fourcc.h	drm: Remove plane hsub/vsub alignment requirement for core helpers	2023-10-12 09:51:19 +02:00
drm_framebuffer.h	drm: Remove legacy cursor hotspot code	2023-11-24 11:58:02 +01:00
drm_gem_atomic_helper.h	drm/atomic-helper: Add format-conversion state to shadow-plane state	2023-11-14 10:01:14 +01:00
drm_gem_dma_helper.h	drm: Clear fd/handle callbacks in struct drm_driver	2023-06-26 11:08:41 +02:00
drm_gem_framebuffer_helper.h
drm_gem_shmem_helper.h	drm/gem: Acquire reservation lock in drm_gem_{pin/unpin}()	2024-03-11 13:33:50 +01:00
drm_gem_ttm_helper.h
drm_gem_vram_helper.h	drm: fix drm_gem_vram_helper.h kernel-doc	2024-03-07 17:17:25 +02:00
drm_gem.h	drm/fbdev-generic: Fix locking with drm_client_buffer_vmap_local()	2024-03-11 13:33:50 +01:00
drm_gpuvm.h	Merge drm/drm-next into drm-misc-next	2024-01-29 14:20:23 +01:00
drm_ioctl.h	drm: Remove locking for legacy ioctls and DRM_UNLOCKED	2023-12-06 10:08:32 +01:00
drm_kunit_helpers.h	drm/kunit: fix drm_kunit_helpers.h kernel-doc	2024-03-07 17:17:25 +02:00
drm_lease.h	drm/lease: make drm_lease.h self-contained	2024-03-07 17:17:25 +02:00
drm_managed.h	drm/managed: Add drmm_release_action	2024-01-17 10:38:39 +01:00
drm_mipi_dbi.h	drm/format-helper: Pass format-conversion state to helpers	2023-11-14 10:16:53 +01:00
drm_mipi_dsi.h	drm/mipi-dsi: Fix detach call without attach	2023-12-07 09:22:47 +02:00
drm_mm.h
drm_mode_config.h
drm_mode_object.h	drm/drm_mode_object: increase max objects to accommodate new color props	2023-12-13 15:09:53 -05:00
drm_modes.h	drm: Move drm_set_preferred_mode() helper from drm_edid to drm_modes	2024-01-05 21:14:46 +01:00
drm_modeset_helper_vtables.h	drm/drm_modeset_helper_vtables.h: fix typos/spellos	2023-12-13 16:19:01 +01:00
drm_modeset_helper.h
drm_modeset_lock.h
drm_module.h
drm_of.h	drm/of: make drm_of.h self-contained	2024-03-07 17:17:25 +02:00
drm_panel.h	drm/panel: Fix kernel-doc typo for follower_lock	2023-08-03 10:21:27 +02:00
drm_pciids.h
drm_plane_helper.h	drm/plane-helper: Move drm_plane_helper_atomic_check() into udl	2023-12-06 10:35:49 +01:00
drm_plane.h	drm/drm_plane: track color mgmt changes per plane	2023-12-13 15:09:53 -05:00
drm_prime.h	Revert "drm/prime: Unexport helpers for fd/handle conversion"	2023-11-30 14:46:04 -05:00
drm_print.h	drm-misc-next for v6.9:	2024-02-16 13:16:40 +10:00
drm_privacy_screen_consumer.h
drm_privacy_screen_driver.h
drm_privacy_screen_machine.h
drm_probe_helper.h	drm/probe-helper: remove unused drm_connector_helper_get_modes_from_ddc()	2024-01-08 12:37:52 +02:00
drm_property.h	drm/drm_property: make replace_property_blob_from_id a DRM helper	2023-12-13 15:09:53 -05:00
drm_rect.h	drm/rect: fix kernel-doc typos	2024-02-05 11:02:07 +01:00
drm_self_refresh_helper.h
drm_simple_kms_helper.h
drm_suballoc.h	drm/suballoc: fix drm_suballoc.h kernel-doc	2024-03-07 17:17:25 +02:00
drm_syncobj.h	drm/syncobj: add IOCTL to register an eventfd	2023-07-20 12:01:03 +02:00
drm_sysfs.h	drm/sysfs: rename drm_sysfs_connector_status_event()	2023-06-23 15:54:00 +02:00
drm_util.h
drm_utils.h
drm_vblank_work.h
drm_vblank.h	drm/vblank: Add helper to get next vblank time	2023-03-28 14:52:59 -07:00
drm_vma_manager.h
drm_writeback.h
gma_drm.h
gpu_scheduler.h	drm/sched: Reverse run-queue priority enumeration	2023-11-24 23:03:53 -05:00
gud.h
i915_component.h	drm/i915/mtl: Define GSC Proxy component interface	2023-05-04 02:57:28 -07:00
i915_drm.h	drm/i915_drm.h: fix a typo	2023-06-02 20:05:45 +03:00
i915_gsc_proxy_mei_interface.h	drm/i915: fix i915_gsc_proxy_mei_interface.h kernel-doc	2024-03-11 11:47:06 +02:00
i915_hdcp_interface.h	drm/i915/hdcp: fix i915_hdcp_interface.h kernel-doc warnings	2024-03-11 11:47:06 +02:00
i915_pciids.h	drm/i915: Update ADL-N PCI IDs	2024-02-14 13:01:27 -08:00
i915_pxp_tee_interface.h	drm/i915/pxp: fix i915_pxp_tee_interface.h kernel-doc warnings	2024-03-11 11:47:06 +02:00
intel_lpe_audio.h
intel-gtt.h
spsc_queue.h
task_barrier.h	drm: Spelling s/randevouz/rendez-vous/	2023-07-29 21:11:54 +02:00
xe_pciids.h	drm/xe: Sync MTL PCI IDs with i915	2023-12-21 11:45:01 -05:00