OpenCloudOS-Kernel/drivers
Rafael J. Wysocki c33676aa48 ACPI: EC: Make the event work state machine visible
The EC driver uses a relatively simple state machine for the event
work handling, but it is not really straightforward to figure out.

The states are as follows:

 "Ready": The event handling work can be submitted.

  In this state, the EC_FLAGS_QUERY_PENDING flag is clear.

 "In progress": The event handling work is pending or is being
                processed.  It cannot be submitted again.

  In ths state, the EC_FLAGS_QUERY_PENDING flag is set and both the
  events_to_process count is nonzero and the EC_FLAGS_QUERY_GUARDING
  flag is clear.

 "Complete": The event handling work has been completed, but it still
             cannot be submitted again.

  In ths state, the EC_FLAGS_QUERY_PENDING flag is set and the
  events_to_process count is zero or the EC_FLAGS_QUERY_GUARDING
  flag is set.

The state changes from "Ready" to "In progress" when new event is
detected by advance_transaction() and acpi_ec_submit_event() is
called by it.

Next, the state can change from "In progress" directly to "Ready" in
the following situations:

 * ec_event_clearing is ACPI_EC_EVT_TIMING_STATUS and the state of
   an ACPI_EC_COMMAND_QUERY transaction becomes ACPI_EC_COMMAND_POLL.

 * ec_event_clearing is ACPI_EC_EVT_TIMING_QUERY and the state of
   an ACPI_EC_COMMAND_QUERY transaction becomes
   ACPI_EC_COMMAND_COMPLETE.

 * ec_event_clearing is either ACPI_EC_EVT_TIMING_STATUS or
   ACPI_EC_EVT_TIMING_QUERY and there are no more events to
   process (ie. ec->events_to_process becomes 0).

If ec_event_clearing is ACPI_EC_EVT_TIMING_EVENT, however, the
state must change from "In progress" to "Complete" before it
can change to "Ready".  The changes from "In progress" to
"Complete" in that case occur in the following situations:

 * The state of an ACPI_EC_COMMAND_QUERY transaction becomes
   ACPI_EC_COMMAND_COMPLETE.

 * There are no more events to process (ie. ec->events_to_process
   becomes 0).

Finally, the state changes from "Complete" to "Ready" when
advance_transaction() is invoked when the state is "Complete" and
the state of the current transaction is not ACPI_EC_COMMAND_POLL.

To make this state machine visible in the code, add a new
event_state field to struct acpi_ec and modify the code to use
it istead the EC_FLAGS_QUERY_PENDING and EC_FLAGS_QUERY_GUARDING
flags.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-12-01 20:17:32 +01:00
..
accessibility
acpi ACPI: EC: Make the event work state machine visible 2021-12-01 20:17:32 +01:00
amba
android binder: fix test regression due to sender_euid change 2021-11-17 16:08:52 +01:00
ata ata: libata-sata: Declare ata_ncq_sdev_attrs static 2021-11-18 14:34:25 +09:00
atm
auxdisplay auxdisplay: cfag12864bfb: code indent should use tabs where possible 2021-10-22 00:13:16 +02:00
base arch_topology: Fix missing clear cluster_cpumask in remove_cpu_topology() 2021-11-11 13:09:33 +01:00
bcma pci-v5.16-changes 2021-11-06 14:36:12 -07:00
block vhost,virtio,vdpa: bugfixes 2021-11-28 11:58:52 -08:00
bluetooth TTY / Serial driver update for 5.16-rc1 2021-11-04 09:09:37 -07:00
bus - Config updates for BMIPS platform 2021-11-13 09:11:33 -08:00
cdrom for-5.16/cdrom-2021-10-29 2021-11-01 10:09:14 -07:00
char Char/Misc driver update for 5.16-rc1 2021-11-04 08:21:47 -07:00
clk Devicetree fixes for v5.16, take 1: 2021-11-14 11:11:51 -08:00
clocksource ARM: 2021-11-02 11:24:14 -07:00
comedi comedi: dt9812: fix DMA buffers on stack 2021-10-30 10:54:47 +02:00
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devfreq Merge branches 'pm-opp' and 'pm-cpufreq' 2021-11-10 14:06:51 +01:00
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edac - amd64_edac: Add support for three-rank interleaving mode which is 2021-11-01 15:02:49 -07:00
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hsi HSI changes for the 5.16 series 2021-11-04 13:56:55 -07:00
hv Drivers: hv: balloon: Use VMBUS_RING_SIZE() wrapper for dm_ring_size 2021-11-15 12:35:56 +00:00
hwmon Merge branch 'akpm' (patches from Andrew) 2021-11-06 14:08:17 -07:00
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i2c i2c: virtio: disable timeout handling 2021-11-23 10:55:48 +01:00
i3c
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iio chrome platform changes for 5.16 2021-11-10 11:36:43 -08:00
infiniband RDMA/nldev: Check stat attribute before accessing it 2021-11-17 16:45:16 -04:00
input xen: add "not_essential" flag to struct xenbus_driver 2021-11-23 13:41:29 -06:00
interconnect
iommu iommu/vt-d: Fix unmap_pages support 2021-11-26 22:54:47 +01:00
ipack
irqchip irqchip/sifive-plic: Fixup EOI failed when masked 2021-11-12 16:09:51 +00:00
isdn
leds
macintosh Merge branch 'akpm' (patches from Andrew) 2021-11-06 14:08:17 -07:00
mailbox mailbox: imx: support i.MX8ULP S4 MU 2021-10-29 23:03:09 -05:00
mcb
md for-5.16/drivers-2021-11-09 2021-11-09 11:24:08 -08:00
media media fixes for v5.16-rc3 2021-11-22 14:58:57 -08:00
memory memory: mtk-smi: Fix a null dereference for the ostd 2021-11-25 14:46:00 +01:00
memstick
message pci-v5.16-changes 2021-11-06 14:36:12 -07:00
mfd chrome platform changes for 5.16 2021-11-10 11:36:43 -08:00
misc More ACPI updates for 5.16-rc1 2021-11-10 11:52:40 -08:00
mmc mmc: spi: Add device-tree SPI IDs 2021-11-23 12:32:28 +01:00
most most: fix control-message timeouts 2021-10-26 19:12:01 +02:00
mtd for-5.16/drivers-2021-11-09 2021-11-09 11:24:08 -08:00
mux mux: add support for delay after muxing 2021-10-21 20:02:42 +01:00
net vhost,virtio,vdpa: bugfixes 2021-11-28 11:58:52 -08:00
nfc nfc: virtual_ncidev: change default device permissions 2021-11-26 11:14:31 -08:00
ntb
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nvdimm libnvdimm for v5.16 2021-11-10 10:56:02 -08:00
nvme nvmet: use IOCB_NOWAIT only if the filesystem supports it 2021-11-25 15:02:40 +01:00
nvmem
of Devicetree fixes for v5.16, take 1: 2021-11-14 11:11:51 -08:00
opp
parisc
parport
pci A set of fixes for the interrupt subsystem: 2021-11-14 10:38:27 -08:00
pcmcia Core: 2021-11-02 06:20:58 -07:00
perf ACPI updates for 5.16-rc1 2021-11-02 15:58:39 -07:00
phy Char/Misc driver update for 5.16-rc1 2021-11-04 08:21:47 -07:00
pinctrl pinctrl: qcom: sm8350: Correct UFS and SDC offsets 2021-11-16 02:19:15 +01:00
platform Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2021-11-24 09:44:13 -08:00
pnp
power power: supply: bq25890: Fix initial setting of the F_CONV_RATE field 2021-11-02 16:48:47 +01:00
powercap powercap: DTPM: Fix suspend failure and kernel warning 2021-11-10 21:18:14 +01:00
pps
ps3
ptp ptp: ocp: Fix a couple NULL vs IS_ERR() checks 2021-11-18 12:12:55 +00:00
pwm pwm: vt8500: Rename pwm_busy_wait() to make it obviously driver-specific 2021-11-05 11:57:13 +01:00
rapidio rapidio: avoid bogus __alloc_size warning 2021-11-06 13:30:33 -07:00
ras
regulator - Remove Drivers 2021-11-08 12:07:52 -08:00
remoteproc
reset ARM: SoC drivers for 5.16 2021-11-03 17:00:52 -07:00
rpmsg remoteproc updates for v5.16 2021-11-10 09:07:26 -08:00
rtc RTC for 5.16 2021-11-12 11:44:31 -08:00
s390 s390: replace snprintf in show functions with sysfs_emit 2021-11-16 12:29:19 +01:00
sbus
scsi vhost,virtio,vdpa: bugfixes 2021-11-28 11:58:52 -08:00
sh
siox
slimbus
soc Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2021-11-10 16:15:54 -08:00
soundwire soundwire: qcom: add debugfs entry for soundwire register dump 2021-10-20 20:54:59 +05:30
spi spi: Fixes for v5.16 2021-11-18 14:35:41 -08:00
spmi
ssb
staging staging: rtl8192e: Fix use after free in _rtl92e_pci_disconnect() 2021-11-17 14:08:57 +01:00
target scsi: target: configfs: Delete unnecessary checks for NULL 2021-11-18 23:07:02 -05:00
tc
tee optee: fix kfree NULL pointer 2021-11-16 14:41:23 +01:00
thermal Merge branch 'thermal-int340x' 2021-11-18 20:40:28 +01:00
thunderbolt thunderbolt: Changes for v5.16 merge window 2021-10-25 13:17:29 +02:00
tty xen: flag hvc_xen to be not essential for system boot 2021-11-23 13:42:08 -06:00
uio Drivers: hv: vmbus: Mark vmbus ring buffer visible to host in Isolation VM 2021-10-28 11:22:23 +00:00
usb USB-serial fixes for 5.16-rc3 2021-11-25 13:27:40 +01:00
vdpa vdpa_sim: avoid putting an uninitialized iova_domain 2021-11-24 19:00:29 -05:00
vfio
vhost vhost-vdpa: clean irqs before reseting vdpa device 2021-11-24 19:00:28 -05:00
video xen: branch for v5.16-rc3 2021-11-26 09:54:13 -08:00
virt
virtio Revert "virtio_ring: validate used buffer length" 2021-11-24 18:47:27 -05:00
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vme
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xen xen: detect uninitialized xenbus in xenbus_init 2021-11-24 08:55:15 -06:00
zorro
Kconfig
Makefile