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Kuogee Hsieh 796d3acd7d drm/msm/dp: do not initialize phy until plugin interrupt received [ Upstream commit `989ebe7bc4` ] Current DP drivers have regulators, clocks, irq and phy are grouped together within a function and executed not in a symmetric manner. This increase difficulty of code maintenance and limited code scalability. This patch divides the driver life cycle of operation into four states, resume (including booting up), dongle plugin, dongle unplugged and suspend. Regulators, core clocks and irq are grouped together and enabled at resume (or booting up) so that the DP controller is armed and ready to receive HPD plugin interrupts. HPD plugin interrupt is generated when a dongle plugs into DUT (device under test). Once HPD plugin interrupt is received, DP controller will initialize phy so that dpcd read/write will function and following link training can be proceeded successfully. DP phy will be disabled after main link is teared down at end of unplugged HPD interrupt handle triggered by dongle unplugged out of DUT. Finally regulators, code clocks and irq are disabled at corresponding suspension. Changes in V2: -- removed unnecessary dp_ctrl NULL check -- removed unnecessary phy init_count and power_count DRM_DEBUG_DP logs -- remove flip parameter out of dp_ctrl_irq_enable() -- add fixes tag Changes in V3: -- call dp_display_host_phy_init() instead of dp_ctrl_phy_init() at dp_display_host_init() for eDP Changes in V4: -- rewording commit text to match this commit changes Changes in V5: -- rebase on top of msm-next branch Changes in V6: -- delete flip variable Changes in V7: -- dp_ctrl_irq_enable/disabe() merged into dp_ctrl_reset_irq_ctrl() Changes in V8: -- add more detail comment regrading dp phy at dp_display_host_init() Changes in V9: -- remove set phy_initialized to false when -ECONNRESET detected Changes in v10: -- group into one series Changes in v11: -- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read Changes in v12: -- move dp_display_host_phy_exit() after dp_display_host_deinit() Changes in v13: -- do not execute phy_init until plugged_in interrupt for edp, same as DP. Changes in v14: -- remove redundant dp->core_initialized = false form dp_pm_suspend. Changes in v15: -- remove core_initialized flag check at both host_init and host_deinit Changes in v16: -- remove dp_display_host_phy_exit core_initialized=false at dp_pm_suspend Changes in v17: -- remove core_initialized checking before execute attention_cb() Changes in v18: -- remove core_initialized checking at dp_pm_suspend Fixes: `8ede2ecc3e` ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets") Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Link: https://lore.kernel.org/r/1642531648-8448-2-git-send-email-quic_khsieh@quicinc.com Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-06-29 09:03:23 +02:00
arch	KVM: arm64: Prevent kmemleak from accessing pKVM memory	2022-06-29 09:03:22 +02:00
block	block: Fix handling of offline queues in blk_mq_alloc_request_hctx()	2022-06-22 14:22:02 +02:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:22:01 +02:00
crypto	crypto: memneq - move into lib/	2022-06-22 14:22:03 +02:00
Documentation	x86/speculation/mmio: Add sysfs reporting for Processor MMIO Stale Data	2022-06-16 13:30:33 +02:00
drivers	drm/msm/dp: do not initialize phy until plugin interrupt received	2022-06-29 09:03:23 +02:00
fs	btrfs: add error messages to all unrecognized mount options	2022-06-29 09:03:19 +02:00
include	ata: libata: add qc->flags in ata_qc_complete_template tracepoint	2022-06-29 09:03:20 +02:00
init	Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug	2022-06-09 10:23:26 +02:00
ipc	ipc/mqueue: use get_tree_nodev() in mqueue_get_tree()	2022-06-09 10:23:10 +02:00
kernel	tracing/kprobes: Check whether get_kretprobe() returns NULL in kretprobe_dispatcher()	2022-06-29 09:03:20 +02:00
lib	crypto: memneq - move into lib/	2022-06-22 14:22:03 +02:00
LICENSES
mm	init: Initialize noop_backing_dev_info early	2022-06-22 14:22:02 +02:00
net	net/sched: sch_netem: Fix arithmetic in netem_dump() for 32-bit platforms	2022-06-29 09:03:23 +02:00
samples	samples/landlock: Format with clang-format	2022-06-09 10:23:23 +02:00
scripts	faddr2line: Fix overlapping text section failures, the sequel	2022-06-22 14:22:02 +02:00
security	KEYS: trusted: tpm2: Fix migratable logic	2022-06-14 18:36:25 +02:00
sound	ALSA: hda/realtek: Add quirk for Clevo NS50PU	2022-06-29 09:03:18 +02:00
tools	selftests/bpf: Add selftest for calling global functions from freplace	2022-06-25 15:18:40 +02:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:27:15 +01:00
virt	KVM: avoid NULL pointer dereference in kvm_dirty_ring_push	2022-04-13 20:59:26 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap	mailmap: add Andrej Shadura	2021-10-18 20:22:03 -10:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	MAINTAINERS: Add new IOMMU development mailing list	2022-06-29 09:03:20 +02:00
Makefile	Linux 5.15.50	2022-06-25 15:18:40 +02:00
README

README

Linux kernel
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There are various text files in the Documentation/ subdirectory,
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Please read the Documentation/process/changes.rst file, as it contains the
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