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linux/include/drm
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Douglas Anderson 90bd113e65 drm/dp: Don't attempt AUX transfers when eDP panels are not powered 
[ Upstream commit 8df1ddb5bf ]

If an eDP panel is not powered on then any attempts to talk to it over
the DP AUX channel will timeout. Unfortunately these attempts may be
quite slow. Userspace can initiate these attempts either via a
/dev/drm_dp_auxN device or via the created i2c device.

Making the DP AUX drivers timeout faster is a difficult proposition.
In theory we could just poll the panel's HPD line in the AUX transfer
function and immediately return an error there. However, this is
easier said than done. For one thing, there's no hard requirement to
hook the HPD line up for eDP panels and it's OK to just delay a fixed
amount. For another thing, the HPD line may not be fast to probe. On
parade-ps8640 we need to wait for the bridge chip's firmware to boot
before we can get the HPD line and this is a slow process.

The fact that the transfers are taking so long to timeout is causing
real problems. The open source fwupd daemon sometimes scans DP busses
looking for devices whose firmware need updating. If it happens to
scan while a panel is turned off this scan can take a long time. The
fwupd daemon could try to be smarter and only scan when eDP panels are
turned on, but we can also improve the behavior in the kernel.

Let's let eDP panels drivers specify that a panel is turned off and
then modify the common AUX transfer code not to attempt a transfer in
this case.

Tested-by: Steev Klimaszewski <steev@kali.org>
Reviewed-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Eizan Miyamoto <eizan@chromium.org>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240202141109.1.I24277520ac754ea538c9b14578edc94e1df11b48@changeid
Stable-dep-of: 5e842d55ba ("drm/panel: atna33xc20: Fix unbalanced regulator in the case HPD doesn't assert")
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-06-12 11:03:21 +02:00
..
bridge drm: bridge: dw_hdmi: Audio: Add General Parallel Audio (GPA) driver 2022-04-19 18:23:48 +02:00
display drm/dp: Don't attempt AUX transfers when eDP panels are not powered 2024-06-12 11:03:21 +02:00
i2c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ttm drm/ttm: fix undefined behavior in bit shift for TTM_TT_FLAG_PRIV_POPULATED 2022-12-31 13:32:06 +01:00
amd_asic_type.h drm/amdgpu: add new asic_type for IP discovery 2021-10-04 15:23:01 -04:00
drm_aperture.h drm/aperture: Remove primary argument 2023-08-30 16:10:57 +02:00
drm_atomic.h drm/atomic: fix warning of unused variable 2022-06-09 16:09:46 +02:00
drm_atomic_helper.h drm: drm_atomic_helper: Add a new helper to deal with the writeback connector validation 2022-09-05 20:12:16 -01:00
drm_atomic_state_helper.h drm/bridge: Add a drm_bridge_state object 2020-01-31 16:00:21 +01:00
drm_atomic_uapi.h drm: handle kernel fences in drm_gem_plane_helper_prepare_fb v2 2022-05-02 09:01:51 +02:00
drm_audio_component.h ALSA: hda/i915 - fix list corruption with concurrent probes 2020-10-09 16:46:04 +02:00
drm_auth.h drm: clarify usage of drm leases 2021-07-29 09:12:01 +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 typo in post_disable() description 2024-01-25 15:27:32 -08:00
drm_bridge_connector.h drm: Add helper to create a connector for a chain of bridges 2020-02-26 13:31:41 +02:00
drm_buddy.h drm/selftests: add drm buddy alloc range testcase 2022-02-23 10:44:43 +01:00
drm_cache.h LoongArch: Add writecombine support for drm 2022-06-03 20:09:27 +08:00
drm_client.h dma-buf-map: Rename to iosys-map 2022-02-07 16:35:35 -08:00
drm_color_mgmt.h drm: using mul_u32_u32() requires linux/math64.h 2024-02-05 20:13:00 +00:00
drm_connector.h drm/edid: add a quirk for two LG monitors to get them to work on 10bpc 2022-12-31 13:32:59 +01:00
drm_crtc.h drm/crtc: Introduce drmm_crtc_init_with_planes 2022-07-13 10:46:05 +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/plane: Move drm_plane_enable_fb_damage_clips into core 2021-07-27 12:21:22 +02:00
drm_debugfs.h drm/debugfs: remove checks for return value of drm_debugfs functions. 2020-03-18 17:32:20 +01:00
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: Declare hashtable as legacy 2021-11-30 09:41:28 +01:00
drm_displayid.h drm/displayid: convert to drm_edid 2022-05-13 18:55:13 +03:00
drm_drv.h drm: Return error codes from struct drm_driver.gem_create_object 2021-12-02 11:12:39 +01:00
drm_edid.h drm/edid: Handle EDID 1.4 range descriptor h/vfreq offsets 2022-09-02 16:38:51 +03:00
drm_encoder.h drm/encoder: Introduce drmm_encoder_init 2022-07-13 10:46:05 +02:00
drm_encoder_slave.h drm: Remove linux/i2c.h from drm_crtc.h 2022-07-05 21:15:23 +03:00
drm_fb_dma_helper.h drm/gem: rename GEM CMA helpers to GEM DMA helpers 2022-08-03 18:31:49 +02:00
drm_fb_helper.h drm: Remove linux/fb.h from drm_crtc.h 2022-07-05 21:14:02 +03:00
drm_file.h drm: Remove the drm_get_unmapped_area() helper 2022-08-04 11:39:27 -04:00
drm_fixed.h drm: Fix drm_fixp2int_round() making it add 0.5 2024-03-26 18:21:00 -04:00
drm_flip_work.h drm/kms-helpers: Use recommened kerneldoc for struct member refs 2017-01-25 16:18:57 +01:00
drm_format_helper.h drm/format-helper: Add drm_fb_build_fourcc_list() helper 2022-09-12 09:15:49 +02:00
drm_fourcc.h drm/fourcc: Add drm_format_info.is_color_indexed flag 2022-07-09 15:00:08 +02:00
drm_framebuffer.h drm/fb: Improve drm_framebuffer.offsets documentation 2022-07-09 15:58:52 +02:00
drm_gem.h drm/msm/gem: Prevent blocking within shrinker loop 2023-03-22 13:33:39 +01:00
drm_gem_atomic_helper.h dma-buf-map: Rename to iosys-map 2022-02-07 16:35:35 -08:00
drm_gem_dma_helper.h drm/gem: rename struct drm_gem_dma_object.{paddr => dma_addr} 2022-08-03 18:32:27 +02:00
drm_gem_framebuffer_helper.h drm/gem: Ignore color planes that are unused by framebuffer format 2022-05-19 19:25:02 +02:00
drm_gem_shmem_helper.h drm: correct comments 2022-07-21 12:16:10 +02:00
drm_gem_ttm_helper.h dma-buf-map: Rename to iosys-map 2022-02-07 16:35:35 -08:00
drm_gem_vram_helper.h dma-buf-map: Rename to iosys-map 2022-02-07 16:35:35 -08:00
drm_ioctl.h drm: unexport drm_ioctl_permit 2021-08-13 17:50:48 +02:00
drm_lease.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
drm_legacy.h drm: Declare hashtable as legacy 2021-11-30 09:41:28 +01:00
drm_managed.h drm: fix drmm_mutex_init() 2023-05-30 14:03:20 +01:00
drm_mipi_dbi.h drm/probe-helper: Add drm_crtc_helper_mode_valid_fixed() 2022-09-12 09:14:26 +02:00
drm_mipi_dsi.h drm/mipi-dsi: Fix detach call without attach 2024-02-05 20:12:55 +00:00
drm_mm.h drm: Replace kernel.h with the necessary inclusions 2021-12-09 13:46:13 +01:00
drm_mode_config.h drm: remove allow_fb_modifiers 2022-01-31 21:45:24 +01:00
drm_mode_object.h drm/object: Add drm_object_property_get_default_value() function 2022-02-25 17:55:42 +01:00
drm_modes.h drm/modes: Add initializer macro DRM_MODE_INIT() 2022-09-12 09:14:59 +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/probe-helper: warn about negative .get_modes() 2024-04-03 15:19:36 +02:00
drm_modeset_lock.h drm/locking: fix drm_modeset_acquire_ctx kernel-doc 2022-01-20 14:41:25 +02:00
drm_module.h drm: Provide platform module-init macro 2022-01-19 18:40:18 +01:00
drm_of.h drm: of: Mark empty drm_of_get_data_lanes_count and drm_of_get_data_lanes_ep static 2022-06-12 16:07:05 +02:00
drm_panel.h drm/panel: drop DSC pps pointer 2022-09-18 09:38:06 -07:00
drm_pciids.h drm/radeon: change SPDX identifier to MIT 2018-10-15 16:16:12 -05:00
drm_plane.h drm/plane: Allocate planes with drm_universal_plane_alloc() 2022-09-20 09:41:06 +02:00
drm_plane_helper.h drm/plane-helper: Add the missing declaration of drm_atomic_state 2023-01-12 12:02:52 +01:00
drm_prime.h dma-buf-map: Rename to iosys-map 2022-02-07 16:35:35 -08:00
drm_print.h drm/drm_print: correct format problem 2023-03-10 09:33:57 +01:00
drm_privacy_screen_consumer.h drm/privacy-screen: Add notifier support (v2) 2021-10-14 13:12:25 +02:00
drm_privacy_screen_driver.h drm/privacy_screen: Add drvdata in drm_privacy_screen 2022-01-10 12:17:37 +01:00
drm_privacy_screen_machine.h drm/privacy-screen: Add X86 specific arch init code 2021-10-14 13:12:24 +02:00
drm_probe_helper.h drm/probe-helper: Add drm_crtc_helper_mode_valid_fixed() 2022-09-12 09:14:26 +02:00
drm_property.h drm: document drm_property_enum.value for bitfields 2021-07-26 10:08:22 +02:00
drm_rect.h drm/rect: Add DRM_RECT_INIT() macro 2022-06-27 13:45:48 +02:00
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: Support custom CRTC state 2021-08-08 20:14:08 +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/sysfs: introduce drm_sysfs_connector_hotplug_event 2021-11-02 14:27:06 +01:00
drm_util.h drm: Move EXPORT_SYMBOL_FOR_TESTS_ONLY under a separate Kconfig 2019-11-07 21:22:15 +00:00
drm_utils.h drm: export drm_timeout_abs_to_jiffies 2019-03-07 12:00:30 -06:00
drm_vblank.h drm/vblank: Document drm_crtc_vblank_restore constraints 2021-02-10 12:38:55 +01:00
drm_vblank_work.h drm/vblank: Add vblank works 2020-07-16 18:16:31 -04:00
drm_vma_manager.h drm/drm_vma_manager: Add drm_vma_node_allow_once() 2023-02-01 08:34:42 +01:00
drm_writeback.h drm: introduce drm_writeback_connector_init_with_encoder() API 2022-05-02 02:12:59 +03:00
gma_drm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 335 2019-06-05 17:37:06 +02:00
gpu_scheduler.h gpu/drm: Eliminate DRM_SCHED_PRIORITY_UNSET 2023-11-08 14:11:00 +01:00
gud.h drm/gud: Add GUD_PIXEL_FORMAT_RGB888 2021-10-04 12:06:14 +02:00
i915_component.h drm/i915/pxp: Define PXP component interface 2021-10-04 13:09:53 -04:00
i915_drm.h drm/i915: include uapi/drm/i915_drm.h directly where needed 2022-03-17 20:06:04 +02:00
i915_mei_hdcp_interface.h drm/display: Move HDCP helpers into display-helper module 2022-04-25 11:19:36 +02:00
i915_pciids.h drm/i915/dg2: Drop one PCI ID 2023-05-11 23:03:07 +09:00
i915_pxp_tee_interface.h drm/i915/pxp: Define PXP component interface 2021-10-04 13:09:53 -04:00
intel-gtt.h agp/intel: Rename intel-gtt symbols 2022-06-22 15:52:55 -07:00
intel_lpe_audio.h ALSA: x86: Register multiple PCM devices for the LPE audio card 2017-05-03 16:24:00 +03:00
spsc_queue.h drm: move amd_gpu_scheduler into common location 2017-12-07 11:51:56 -05:00
task_barrier.h drm: Add Reusable task barrier. 2019-12-18 16:09:12 -05:00