linux-kernel - [PATCH v5 0/5] PCI: EPC: Add support to wake up host from D3 states

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Date:   Wed,  2 Aug 2023 10:29:14 +0530
From:   Krishna chaitanya chundru <quic_krichai@...cinc.com>
To:     manivannan.sadhasivam@...aro.org
Cc:     helgaas@...nel.org, linux-pci@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_vbadigan@...cinc.com, quic_nitegupt@...cinc.com,
        quic_skananth@...cinc.com, quic_ramkri@...cinc.com,
        quic_parass@...cinc.com, krzysztof.kozlowski@...aro.org,
        Krishna chaitanya chundru <quic_krichai@...cinc.com>
Subject: [PATCH v5 0/5]  PCI: EPC: Add support to wake up host from D3 states

Here we propose this patch series to add support in PCI endpoint
driver to wake up host from D3 states.

As endpoint cannot send any data/MSI when the D-state is in
D3cold or D3hot. Endpoint needs to bring the device back to D0
to send any kind of data.

For this endpoint needs to send inband PME the device is in D3 state or
toggle wake when the device is D3 cold and vaux is not supplied.

Based on the D-state the EPF driver decides to wake host either by
toggling wake or by sending PME.

When the MHI state is in M3 MHI driver will wakeup the host using the
wakeup op.

This change is dependent on this series PCI: endpoint: add D-state change notifier
support

https://lore.kernel.org/linux-pci/1690948281-2143-1-git-send-email-quic_krichai@quicinc.com/

---
Changes from v4:
	- removed the enum to select to send PME or toggle wake and use bool variable in 
	  the api itself as suggested by mani.
Changes from v3:
	- changed the bool return type to int for waking the host in mhi ep driver
	 as suggested by dan and bjorn.
	- Changed commit logs as suggested by bjorn.
Changes from v2:
        - Addressed review comments made by mani.
Changes from v1:
        - Moved from RFC patch to regular patch
        - Inclueded EPF patch and added a new op patch to notify D-state change.
---

Krishna chaitanya chundru (5):
  PCI: endpoint: Add wakeup host API to EPC core
  PCI: dwc: Add wakeup host op to pci_epc_ops
  PCI: qcom-ep: Add wake up host op to dw_pcie_ep_ops
  PCI: epf-mhi: Add wakeup host op
  bus: mhi: ep: wake up host if the MHI state is in M3

 Documentation/PCI/endpoint/pci-endpoint.rst     |  6 +++++
 drivers/bus/mhi/ep/main.c                       | 28 +++++++++++++++++++++++
 drivers/pci/controller/dwc/pcie-designware-ep.c | 12 ++++++++++
 drivers/pci/controller/dwc/pcie-designware.h    |  2 ++
 drivers/pci/controller/dwc/pcie-qcom-ep.c       | 26 +++++++++++++++++++++
 drivers/pci/endpoint/functions/pci-epf-mhi.c    | 12 ++++++++++
 drivers/pci/endpoint/pci-epc-core.c             | 30 +++++++++++++++++++++++++
 include/linux/mhi_ep.h                          |  1 +
 include/linux/pci-epc.h                         |  5 +++++
 9 files changed, 122 insertions(+)

-- 
2.7.4