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    Subject[PATCH v2 7/8] PCI: epf-mhi: Add wakeup host op
    Date
    Add wakeup host op for MHI EPF.
    If the D-state is in D3cold toggle wake signal, otherwise send PME.

    Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
    ---
    drivers/pci/endpoint/functions/pci-epf-mhi.c | 19 +++++++++++++++++++
    include/linux/mhi_ep.h | 1 +
    2 files changed, 20 insertions(+)

    diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
    index 64ff37d..deb742c 100644
    --- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
    +++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
    @@ -237,6 +237,24 @@ static int pci_epf_mhi_write_to_host(struct mhi_ep_cntrl *mhi_cntrl,
    return 0;
    }

    +static int pci_epf_mhi_wakeup_host(struct mhi_ep_cntrl *mhi_cntrl)
    +{
    + struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
    + struct pci_epf *epf = epf_mhi->epf;
    + struct pci_epc *epc = epf->epc;
    + int ret;
    +
    + if (mhi_cntrl->dstate == PCI_D3cold)
    + ret = pci_epc_wakeup_host(epc, epf->func_no,
    + epf->vfunc_no, PCI_WAKEUP_TOGGLE_WAKE);
    + else
    + ret = pci_epc_wakeup_host(epc, epf->func_no,
    + epf->vfunc_no, PCI_WAKEUP_SEND_PME);
    +
    + return ret;
    +
    +}
    +
    static int pci_epf_mhi_core_init(struct pci_epf *epf)
    {
    struct pci_epf_mhi *epf_mhi = epf_get_drvdata(epf);
    @@ -293,6 +311,7 @@ static int pci_epf_mhi_link_up(struct pci_epf *epf)
    mhi_cntrl->unmap_free = pci_epf_mhi_unmap_free;
    mhi_cntrl->read_from_host = pci_epf_mhi_read_from_host;
    mhi_cntrl->write_to_host = pci_epf_mhi_write_to_host;
    + mhi_cntrl->wakeup_host = pci_epf_mhi_wakeup_host;

    /* Register the MHI EP controller */
    ret = mhi_ep_register_controller(mhi_cntrl, info->config);
    diff --git a/include/linux/mhi_ep.h b/include/linux/mhi_ep.h
    index c3a0685..e353c429 100644
    --- a/include/linux/mhi_ep.h
    +++ b/include/linux/mhi_ep.h
    @@ -137,6 +137,7 @@ struct mhi_ep_cntrl {
    void __iomem *virt, size_t size);
    int (*read_from_host)(struct mhi_ep_cntrl *mhi_cntrl, u64 from, void *to, size_t size);
    int (*write_to_host)(struct mhi_ep_cntrl *mhi_cntrl, void *from, u64 to, size_t size);
    + int (*wakeup_host)(struct mhi_ep_cntrl *mhi_cntrl);

    enum mhi_state mhi_state;

    --
    2.7.4
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