linux-stable.git/drivers/power/sequencing, branch v6.14

power: sequencing: qcom-wcn: explain why we need the WLAN_EN GPIO hack

2025-01-13T08:07:20+00:00

With the recent rework of the PCI power control code, the workaround for
the wlan-enable GPIO - where we don't set a default (low) state in the
power sequencing driver, but instead request the pin as-is - should no
longer be needed but some platforms still fail to probe the WLAN
controller. This is caused by the Qcom PCIe controller and needs a
workaround in the controller driver so add a FIXME to eventually remove
the hack from this driver once this is done.

Link: https://lore.kernel.org/r/20250102121530.26993-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski

power: sequencing: qcom-wcn: add support for the WCN6750 PMU

2024-12-10T13:31:19+00:00

Enable support for controlling the power-up sequence of the PMU inside
the WCN6750 model.

Signed-off-by: Janaki Ramaiah Thota 
Link: https://lore.kernel.org/r/20241209103455.9675-5-quic_janathot@quicinc.com
Signed-off-by: Bartosz Golaszewski

power: sequencing: qcom-wcn: improve support for wcn6855

2024-10-25T07:59:30+00:00

WCN6855 (also known as QCA6490) is similar to the already supported
QCA6390 but takes in two more supplies so add a new vregs list for it.

On sm8450-hdk it also requires a short assert of the xo-clk pin so add
handling for it in a dedicated unit.

As we now have a separate set of targets for this variant, store the
pointer to the targets struct associated with a model in the device
match data.

Reviewed-by: Dmitry Baryshkov 
Link: https://lore.kernel.org/r/20241018-sc8280xp-pwrseq-v6-2-8da8310d9564@linaro.org
Signed-off-by: Bartosz Golaszewski

power: sequencing: make the QCom PMU pwrseq driver depend on CONFIG_OF

2024-10-23T07:54:06+00:00

This driver uses various OF-specific functions and depends on phandle
parsing. There's no reason to make it available to non-OF systems so add
a relevant dependency switch to its Kconfig entry.

Fixes: 2f1630f437df ("power: pwrseq: add a driver for the PMU module on the QCom WCN chipsets")
Link: https://lore.kernel.org/r/20241004130449.51725-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski

Merge tag 'pwrseq-updates-for-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

2024-09-18T08:46:27+00:00

Pull power sequencing updates from Bartosz Golaszewski:
 "There's one change adding support for a new PMU model and another
  adding documentation for the subsystem which probably should have been
  part of the initial commit but better late than never:

   - add support for the new PMU variant inside the WCN6855 chipset

   - add documentation for the subsystem"

* tag 'pwrseq-updates-for-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  Documentation: add a driver API doc for the power sequencing subsystem
  power: sequencing: qcom-wcn: add support for the WCN6855 PMU

power: sequencing: qcom-wcn: set the wlan-enable GPIO to output

2024-08-31T19:32:19+00:00

Commit a9aaf1ff88a8 ("power: sequencing: request the WLAN enable GPIO
as-is") broke WLAN on boards on which the wlan-enable GPIO enabling the
wifi module isn't in output mode by default. We need to set direction to
output while retaining the value that was already set to keep the ath
module on if it's already started.

Fixes: a9aaf1ff88a8 ("power: sequencing: request the WLAN enable GPIO as-is")
Link: https://lore.kernel.org/r/20240823115500.37280-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski

power: sequencing: qcom-wcn: add support for the WCN6855 PMU

2024-08-19T08:03:31+00:00

Enable support for controlling the power-up sequence of the PMU inside
the WCN6855 model.

Signed-off-by: Konrad Dybcio 
[Bartosz: split Konrad's bigger patch, write the commit message]
Co-developed-by: Bartosz Golaszewski 
Link: https://lore.kernel.org/r/20240813190841.155067-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski

power: sequencing: request the WLAN enable GPIO as-is

2024-08-19T07:55:53+00:00

If the WCN module is powered up before linux boots and the ath11k driver
probes at the same time as the power sequencing driver, we may end up
driving the wlan-enable GPIO low in the latter, breaking the start-up of
the WLAN module. Request the wlan-enable GPIO as-is so that if the WLAN
module is already starting/started, we leave it alone.

Fixes: 2f1630f437df ("power: pwrseq: add a driver for the PMU module on the QCom WCN chipsets")
Reported-by: Stephan Gerhold 
Link: https://lore.kernel.org/r/20240813190751.155035-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski

power: sequencing: fix an invalid pointer dereference in error path

2024-07-17T14:30:50+00:00

We may end up calling pwrseq_target_free() on a partially initialized
target object whose unit is either NULL or an ERR_PTR(). Avoid
dereferencing invalid memory by adding an appropriate check to
pwrseq_target_free().

Fixes: 249ebf3f65f8 ("power: sequencing: implement the pwrseq core")
Reported-by: Dan Carpenter 
Closes: https://lore.kernel.org/linux-pm/62a3531e-9927-40f8-b587-254a2dfa47ef@stanley.mountain/
Reviewed-by: Dan Carpenter 
Link: https://lore.kernel.org/r/20240712194004.241939-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski

power: sequencing: simplify returning pointer without cleanup

2024-07-03T09:49:04+00:00

Use 'return_ptr' helper for returning a pointer without cleanup for
shorter code.

Signed-off-by: Krzysztof Kozlowski 
Link: https://lore.kernel.org/r/20240703083038.95777-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Bartosz Golaszewski