On Fri, Jun 30, 2023 at 04:22:10PM +0530, Krishna chaitanya chundru wrote:
> 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@xxxxxxxxxxx>
> ---
> 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);
> +
If the wakeup argument is of type bool (ie. bool use_pme), then
wakeup = (mhi_cntrl->dstate == PCI_D3cold) ? false : true;
return pci_epc_wakeup_host(epc, epf->func_no, epf->vfunc_no, state);
- Mani
> + 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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