Pull soundwire updates from Vinod Koul:
"Updates for Intel, Cadence and Qualcomm drivers:
- another round of Intel driver cleanup to prepare for future code
reorg which is expected in next cycle (Pierre-Louis Bossart)
- bus unattach notifications processing during re-enumeration along
with Cadence driver updates for this (Richard Fitzgerald)
- Qualcomm driver updates to handle device0 status (Srinivas
Kandagatla)"
* tag 'soundwire-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/soundwire: (42 commits)
soundwire: intel: add helper to stop bus
soundwire: intel: introduce helpers to start bus
soundwire: intel: introduce intel_shim_check_wake() helper
soundwire: intel: simplify read ops assignment
soundwire: intel: remove intel_init() wrapper
soundwire: intel: move shim initialization before power up/down
soundwire: intel: remove clock_stop parameter in intel_shim_init()
soundwire: intel: move all PDI initialization under intel_register_dai()
soundwire: intel: move DAI registration and debugfs init earlier
soundwire: intel: simplify flow and use devm_ for DAI registration
soundwire: intel: fix error handling on dai registration issues
soundwire: cadence: Simplify error paths in cdns_xfer_msg()
soundwire: cadence: Fix error check in cdns_xfer_msg()
soundwire: cadence: Write to correct address for each FIFO chunk
soundwire: bus: Fix wrong port number in sdw_handle_slave_alerts()
soundwire: qcom: do not send status of device 0 during alert
soundwire: qcom: update status from device id 1
soundwire: cadence: Don't overwrite msg->buf during write commands
soundwire: bus: Don't exit early if no device IDs were programmed
soundwire: cadence: Fix lost ATTACHED interrupts when enumerating
...
Only exit sdw_handle_slave_status() right after calling
sdw_program_device_num() if it actually programmed an ID into at
least one device.
sdw_handle_slave_status() should protect itself against phantom
device #0 ATTACHED indications. In that case there is no actual
device still on #0. The early exit relies on there being a status
change to ATTACHED on the reprogrammed device to trigger another
call to sdw_handle_slave_status() which will then handle the status
of all peripherals. If no device was actually programmed with an
ID there won't be a new ATTACHED indication. This can lead to the
status of other peripherals not being handled.
The status passed to sdw_handle_slave_status() is obviously always
from a point of time in the past, and may indicate accumulated
unhandled events (depending how the bus manager operates). It's
possible that a device ID is reprogrammed but the last PING status
captured state just before that, when it was still reporting on
ID #0. Then sdw_handle_slave_status() is called with this PING info,
just before a new PING status is available showing it now on its new
ID. So sdw_handle_slave_status() will receive a phantom report of a
device on #0, but it will not find one.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220914160248.1047627-6-rf@opensource.cirrus.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Don't re-enumerate a peripheral on #0 until we have seen and
handled an UNATTACHED notification for that peripheral.
Without this, it is possible for the UNATTACHED status to be missed
and so the slave->status remains at ATTACHED. If slave->status never
changes to UNATTACHED the child driver will never be notified of the
UNATTACH, and the code in sdw_handle_slave_status() will skip the
second part of enumeration because the slave->status has not changed.
This scenario can happen because PINGs are handled in a workqueue
function which is working from a snapshot of an old PING, and there
is no guarantee when this function will run.
A peripheral could report attached in the PING being handled by
sdw_handle_slave_status(), but has since reverted to device #0 and is
then found in the loop in sdw_program_device_num(). Previously the
code would not have updated slave->status to UNATTACHED because it had
not yet handled a PING where that peripheral had UNATTACHED.
This situation happens fairly frequently with multiple peripherals on
a bus that are intentionally reset (for example after downloading
firmware).
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220914160248.1047627-4-rf@opensource.cirrus.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Ensure that if sdw_handle_slave_status() sees a peripheral
has dropped off the bus it reports it to the client driver.
If there are any devices reporting on address 0 it bails out
after programming the device IDs. So it never reaches the second
loop that calls sdw_update_slave_status().
If the missing device is one that is now showing as unenumerated
it has been given a device ID so will report as attached next
time sdw_handle_slave_status() runs.
With the previous code the client driver would only see another
ATTACHED notification because the UNATTACHED state was lost when
sdw_handle_slave_status() bailed out after programming the
device ID.
This shows up most when the peripheral has to be reset after
downloading updated firmware and there are multiple of these
peripherals on the bus. They will all return to unenumerated state
after the reset, and then there is a mix of unattached, attached
and unenumerated PING states from the peripherals, as each is reset
and they reboot.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220914160248.1047627-3-rf@opensource.cirrus.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
The SoundWire specification allows the device number to be allocated
at will. When a system includes multiple SoundWire links, the device
number scope is limited to the link to which the device is attached.
However, for integration/debug it can be convenient to have a unique
device number across the system. This patch adds a 'dev_num_ida_min'
field at the bus level, which when set will be used to allocate an
IDA.
The allocation happens when a hardware device reports as ATTACHED. If
any error happens during the enumeration, the allocated IDA is not
freed - the device number will be reused if/when the device re-joins
the bus. The IDA is only freed when the Linux device is unregistered.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20220823045004.2670658-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
In the SoundWire probe, we store a pointer from the driver ops into
the 'slave' structure. This can lead to kernel oopses when unbinding
codec drivers, e.g. with the following sequence to remove machine
driver and codec driver.
/sbin/modprobe -r snd_soc_sof_sdw
/sbin/modprobe -r snd_soc_rt711
The full details can be found in the BugLink below, for reference the
two following examples show different cases of driver ops/callbacks
being invoked after the driver .remove().
kernel: BUG: kernel NULL pointer dereference, address: 0000000000000150
kernel: Workqueue: events cdns_update_slave_status_work [soundwire_cadence]
kernel: RIP: 0010:mutex_lock+0x19/0x30
kernel: Call Trace:
kernel: ? sdw_handle_slave_status+0x426/0xe00 [soundwire_bus 94ff184bf398570c3f8ff7efe9e32529f532e4ae]
kernel: ? newidle_balance+0x26a/0x400
kernel: ? cdns_update_slave_status_work+0x1e9/0x200 [soundwire_cadence 1bcf98eebe5ba9833cd433323769ac923c9c6f82]
kernel: BUG: unable to handle page fault for address: ffffffffc07654c8
kernel: Workqueue: pm pm_runtime_work
kernel: RIP: 0010:sdw_bus_prep_clk_stop+0x6f/0x160 [soundwire_bus]
kernel: Call Trace:
kernel: <TASK>
kernel: sdw_cdns_clock_stop+0xb5/0x1b0 [soundwire_cadence 1bcf98eebe5ba9833cd433323769ac923c9c6f82]
kernel: intel_suspend_runtime+0x5f/0x120 [soundwire_intel aca858f7c87048d3152a4a41bb68abb9b663a1dd]
kernel: ? dpm_sysfs_remove+0x60/0x60
This was not detected earlier in Intel tests since the tests first
remove the parent PCI device and shut down the bus. The sequence
above is a corner case which keeps the bus operational but without a
driver bound.
While trying to solve this kernel oopses, it became clear that the
existing SoundWire bus does not deal well with the unbind case.
Commit 528be501b7 ("soundwire: sdw_slave: add probe_complete structure and new fields")
added a 'probed' status variable and a 'probe_complete'
struct completion. This status is however not reset on remove and
likewise the 'probe complete' is not re-initialized, so the
bind/unbind/bind test cases would fail. The timeout used before the
'update_status' callback was also a bad idea in hindsight, there
should really be no timing assumption as to if and when a driver is
bound to a device.
An initial draft was based on device_lock() and device_unlock() was
tested. This proved too complicated, with deadlocks created during the
suspend-resume sequences, which also use the same device_lock/unlock()
as the bind/unbind sequences. On a CometLake device, a bad DSDT/BIOS
caused spurious resumes and the use of device_lock() caused hangs
during suspend. After multiple weeks or testing and painful
reverse-engineering of deadlocks on different devices, we looked for
alternatives that did not interfere with the device core.
A bus notifier was used successfully to keep track of DRIVER_BOUND and
DRIVER_UNBIND events. This solved the bind-unbind-bind case in tests,
but it can still be defeated with a theoretical corner case where the
memory is freed by a .remove while the callback is in use. The
notifier only helps make sure the driver callbacks are valid, but not
that the memory allocated in probe remains valid while the callbacks
are invoked.
This patch suggests the introduction of a new 'sdw_dev_lock' mutex
protecting probe/remove and all driver callbacks. Since this mutex is
'local' to SoundWire only, it does not interfere with existing locks
and does not create deadlocks. In addition, this patch removes the
'probe_complete' completion, instead we directly invoke the
'update_status' from the probe routine. That removes any sort of
timing dependency and a much better support for the device/driver
model, the driver could be bound before the bus started, or eons after
the bus started and the hardware would be properly initialized in all
cases.
BugLink: https://github.com/thesofproject/linux/issues/3531
Fixes: 56d4fe31af ("soundwire: Add MIPI DisCo property helpers")
Fixes: 528be501b7 ("soundwire: sdw_slave: add probe_complete structure and new fields")
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220621225641.221170-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
In typical use cases, the peripheral becomes pm_runtime active as a
result of the ALSA/ASoC framework starting up a DAI. The parent/child
hierarchy guarantees that the manager device will be fully resumed
beforehand.
There is however a corner case where the manager device may become
pm_runtime active, but without ALSA/ASoC requesting any functionality
from the peripherals. In this case, the hardware peripheral device
will report as ATTACHED and its initialization routine will be
executed. If this initialization routine initiates any sort of
deferred processing, there is a possibility that the manager could
suspend without the peripheral suspend sequence being invoked: from
the pm_runtime framework perspective, the peripheral is *already*
suspended.
To avoid such disconnects between hardware state and pm_runtime state,
this patch adds an asynchronous pm_request_resume() upon successful
attach/initialization which will result in the proper resume/suspend
sequence to be followed on the peripheral side.
BugLink: https://github.com/thesofproject/linux/issues/3459
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20220420023241.14335-4-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Slave pointer is invalid after end of list iteration, using this
would result in below Memory abort.
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004
...
Call trace:
__dev_printk+0x34/0x7c
_dev_warn+0x6c/0x90
sdw_bus_exit_clk_stop+0x194/0x1d0
swrm_runtime_resume+0x13c/0x238
pm_generic_runtime_resume+0x2c/0x48
__rpm_callback+0x44/0x150
rpm_callback+0x6c/0x78
rpm_resume+0x314/0x558
rpm_resume+0x378/0x558
rpm_resume+0x378/0x558
__pm_runtime_resume+0x3c/0x88
Use bus->dev instead to print this error message.
Fixes: b50bb8ba36 ("soundwire: bus: handle -ENODATA errors in clock stop/start sequences")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20211012101521.32087-1-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
We've added quite a few filters to avoid throwing errors if a Device
does not respond to commands during the clock stop sequences, but we
missed one.
This will lead to an isolated message
[ 6115.294412] soundwire sdw-master-1: SDW_SCP_STAT bread failed:-61
The callers already filter this error code, so there's no point in
keeping it at the lower level.
Since this is a recoverable error, make this dev_err() conditional and
only log cases with Command Failed.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210714014209.17357-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Pull char / misc driver updates from Greg KH:
"Here is the big set of char / misc and other driver subsystem updates
for 5.14-rc1. Included in here are:
- habanalabs driver updates
- fsl-mc driver updates
- comedi driver updates
- fpga driver updates
- extcon driver updates
- interconnect driver updates
- mei driver updates
- nvmem driver updates
- phy driver updates
- pnp driver updates
- soundwire driver updates
- lots of other tiny driver updates for char and misc drivers
This is looking more and more like the "various driver subsystems
mushed together" tree...
All of these have been in linux-next for a while with no reported
issues"
* tag 'char-misc-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (292 commits)
mcb: Use DEFINE_RES_MEM() helper macro and fix the end address
PNP: moved EXPORT_SYMBOL so that it immediately followed its function/variable
bus: mhi: pci-generic: Add missing 'pci_disable_pcie_error_reporting()' calls
bus: mhi: Wait for M2 state during system resume
bus: mhi: core: Fix power down latency
intel_th: Wait until port is in reset before programming it
intel_th: msu: Make contiguous buffers uncached
intel_th: Remove an unused exit point from intel_th_remove()
stm class: Spelling fix
nitro_enclaves: Set Bus Master for the NE PCI device
misc: ibmasm: Modify matricies to matrices
misc: vmw_vmci: return the correct errno code
siox: Simplify error handling via dev_err_probe()
fpga: machxo2-spi: Address warning about unused variable
lkdtm/heap: Add init_on_alloc tests
selftests/lkdtm: Enable various testable CONFIGs
lkdtm: Add CONFIG hints in errors where possible
lkdtm: Enable DOUBLE_FAULT on all architectures
lkdtm/heap: Add vmalloc linear overflow test
lkdtm/bugs: XFAIL UNALIGNED_LOAD_STORE_WRITE
...
Idiomatically, write functions should take const pointers to the
data buffer, as they don't change the data. They are also likely
to be called from functions that receive a const data pointer.
Internally the pointer is passed to function/structs shared with
the read functions, requiring a cast, but this is an implementation
detail that should be hidden by the public API.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210616145901.29402-1-rf@opensource.cirrus.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
If a device lost sync and can no longer ACK a command, it may not be
able to enter a lower-power state but it will still be able to resync
when the clock restarts. In those cases, we want to continue with the
clock stop sequence.
This patch modifies the behavior during clock stop sequences to only
log errors unrelated to -ENODATA/Command_Ignored. The flow is also
modified so that loops continue to prepare/deprepare other devices
even when one seems to have lost sync.
When resuming the clocks, all issues are logged with a dev_warn(),
previously only some of them were checked. This is the only part that
now differs between the clock stop entry and clock stop exit
sequences: while we don't want to stop the suspend flow, we do want
information on potential issues while resuming, as they may have
ripple effects.
For consistency the log messages are also modified to be unique and
self-explanatory. Errors in sdw_slave_clk_stop_callback() were
removed, they are now handled in the caller.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210511030048.25622-4-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Existing devices and implementations only support the required
CLOCK_STOP_MODE0. All the code related to CLOCK_STOP_MODE1 has not
been tested and is highly questionable, with a clear confusion between
CLOCK_STOP_MODE1 and the simple clock stop state machine.
This patch removes all usages of CLOCK_STOP_MODE1 - which has no
impact on any solution - and fixes the use of the simple clock stop
state machine. The resulting code should be a lot more symmetrical and
easier to maintain.
Note that CLOCK_STOP_MODE1 is not supported in the SoundWire Device
Class specification so it's rather unlikely that we need to re-add
this mode later.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210511030048.25622-2-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Intel stress-tests routinely report IO timeouts and invalid power
management transitions. Upon further analysis, we seem to be using the
wrong devices in pm_runtime calls.
Before reading and writing registers, we first need to make sure the
Slave is fully resumed. The existing code attempts to do such that,
however because of a confusion dating from 2017 and copy/paste, we
end-up resuming the parent only instead of resuming the codec device.
This can lead to accesses to the Slave registers while the bus is
still being configured and the Slave not enumerated, and as a result
IO errors occur.
This is a classic problem, similar confusions happened for HDaudio
between bus and codec device, leading to power management issues.
Fix by using the relevant device for all uses of pm_runtime functions.
Fixes: 60ee9be255 ('soundwire: bus: add PM/no-PM versions of read/write functions')
Fixes: aa79293517 ('soundwire: bus: fix io error when processing alert event')
Fixes: 9d715fa005 ('soundwire: Add IO transfer')
Reported-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210122070634.12825-9-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
The SoundWire 1.2 specification defines an "SDCA cascade" bit which
handles a logical OR of all SDCA interrupt sources (up to 30 defined).
Due to limitations of the addressing space, this bit is located in the
SDW_DP0_INT register when DP0 is used, or alternatively in the
DP0_SDCA_Support_INTSTAT register when DP0 is not used.
To allow for both cases to be handled, this bit will be checked in the
main device-level interrupt handling code. This will result in the
register being read twice if DP0 is enabled, but it's not clear how to
optimize this case. It's also more logical to deal with this interrupt
at the device than the port level, this bit is really not DP0 specific
and its location in the DP0_INTSTAT bit is only due to the lack of
free space in SCP_INTSTAT_1.
The SDCA_Cascade bit cannot be masked or cleared, so the interrupt
handling only forwards the detection to the Slave driver, which will
deal with reading the relevant SDCA status bits and clearing them. The
bus driver only signals the detection.
The communication with the Slave driver is based on the same interrupt
callback, with only an extension to provide the status of the
sdca_cascade bit.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20201104152358.9518-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Vinod writes:
soundwire updates for 5.10-rc1
This round of update includes:
- Generic bandwidth allocation algorithm from Intel folks
- PM support for Intel chipsets
- Updates to Intel drivers which makes sdw usable on latest laptops
- Support for MMIO SDW controllers found in QC chipsets
- Update to subsystem to use helpers in bitfield.h to manage register
bits
* tag 'soundwire-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/soundwire: (66 commits)
soundwire: sysfs: add slave status and device number before probe
soundwire: bus: add enumerated Slave device to device list
soundwire: remove an unnecessary NULL check
soundwire: cadence: add data port test fail interrupt
soundwire: intel: enable test modes
soundwire: enable Data Port test modes
soundwire: intel: use {u32|u16}p_replace_bits
soundwire: cadence: use u32p_replace_bits
soundwire: qcom: get max rows and cols info from compatible
soundwire: qcom: add support to block packing mode
soundwire: qcom: clear BIT FIELDs before value set.
soundwire: Add generic bandwidth allocation algorithm
soundwire: cadence: add parity error injection through debugfs
soundwire: bus: export broadcast read/write capability for tests
ASoC: codecs: realtek-soundwire: ignore initial PARITY errors
soundwire: bus: use quirk to filter out invalid parity errors
soundwire: slave: add first_interrupt_done status
soundwire: bus: filter-out unwanted interrupt reports
ASoC/soundwire: bus: use property to set interrupt masks
soundwire: qcom: fix SLIBMUS/SLIMBUS typo
...
Currently Slave devices are only added on startup, either from Device
Tree or ACPI entries. However Slave devices that are physically
present on the bus, but not described in platform firmware, will never
be added to the device list. The user/integrator can only know the
list of devices by looking a dynamic debug logs.
This patch suggests adding a Slave device even if there is no matching
DT or ACPI entry, so that we can see this in sysfs entry.
Initial code from Srinivas. Comments, fixes for ACPI probe and edits
of commit message by Pierre.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Co-developed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200924194430.121058-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
