| Message ID | 1688122331-25478-7-git-send-email-quic_krichai@quicinc.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Krzysztof Wilczyński |
| Headers | show |
| Series | PCCI: EPC: Add support to wake up host from D3 states | expand |
On Fri, Jun 30, 2023 at 04:22:09PM +0530, Krishna chaitanya chundru wrote: Subject prefix should be "PCI: qcom-ep:" > Add wakeup host op to dw_pcie_ep_ops to wake up host. > If the EPF asks to send PME trigger the inband PME by writing > into the parf registers otherwise toggle wake signal. > If the wakeup type is PME, then trigger inband PME by writing to the PARF PARF_PM_CTRL register, otherwise toggle #WAKE. > Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com> > --- > drivers/pci/controller/dwc/pcie-qcom-ep.c | 31 +++++++++++++++++++++++++++++++ > 1 file changed, 31 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c > index e75aec4..e382b4b 100644 > --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c > +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c > @@ -89,6 +89,7 @@ > /* PARF_PM_CTRL register fields */ > #define PARF_PM_CTRL_REQ_EXIT_L1 BIT(1) > #define PARF_PM_CTRL_READY_ENTR_L23 BIT(2) > +#define PARF_PM_CTRL_XMT_PME BIT(4) > #define PARF_PM_CTRL_REQ_NOT_ENTR_L1 BIT(5) > > /* PARF_MHI_CLOCK_RESET_CTRL fields */ > @@ -729,10 +730,40 @@ static void qcom_pcie_ep_init(struct dw_pcie_ep *ep) > dw_pcie_ep_reset_bar(pci, bar); > } > > +static int qcom_pcie_ep_wakeup_host(struct dw_pcie_ep *ep, u8 func_no, > + enum pci_epc_wakeup_host_type type) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); > + struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); > + struct device *dev = pci->dev; > + u32 val; > + > + if (type == PCI_WAKEUP_TOGGLE_WAKE) { > + dev_dbg(dev, "Waking up the host by toggling WAKE#\n"); > + gpiod_set_value_cansleep(pcie_ep->wake, 1); > + usleep_range(WAKE_DELAY_US, WAKE_DELAY_US + 500); > + gpiod_set_value_cansleep(pcie_ep->wake, 0); > + return 0; > + > + } else if (type == PCI_WAKEUP_SEND_PME) { > + dev_dbg(dev, "Waking up the host using PME\n"); > + val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); > + val |= PARF_PM_CTRL_XMT_PME; > + writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL); > + > + } else { > + dev_err(dev, "Device is not in D3 state wakeup is not supported\n"); > + return -EOPNOTSUPP; This is not needed if you use bool. And this debug message is wrong btw since you are not checking whether the device is in D3 state or not. - Mani > + } > + > + return 0; > +} > + > static const struct dw_pcie_ep_ops pci_ep_ops = { > .ep_init = qcom_pcie_ep_init, > .raise_irq = qcom_pcie_ep_raise_irq, > .get_features = qcom_pcie_epc_get_features, > + .wakeup_host = qcom_pcie_ep_wakeup_host, > }; > > static int qcom_pcie_ep_probe(struct platform_device *pdev) > -- > 2.7.4 >
On 7/7/2023 11:40 AM, Manivannan Sadhasivam wrote: > On Fri, Jun 30, 2023 at 04:22:09PM +0530, Krishna chaitanya chundru wrote: > > Subject prefix should be "PCI: qcom-ep:" > >> Add wakeup host op to dw_pcie_ep_ops to wake up host. >> If the EPF asks to send PME trigger the inband PME by writing >> into the parf registers otherwise toggle wake signal. >> > If the wakeup type is PME, then trigger inband PME by writing to the PARF > PARF_PM_CTRL register, otherwise toggle #WAKE. > >> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com> >> --- >> drivers/pci/controller/dwc/pcie-qcom-ep.c | 31 +++++++++++++++++++++++++++++++ >> 1 file changed, 31 insertions(+) >> >> diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c >> index e75aec4..e382b4b 100644 >> --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c >> +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c >> @@ -89,6 +89,7 @@ >> /* PARF_PM_CTRL register fields */ >> #define PARF_PM_CTRL_REQ_EXIT_L1 BIT(1) >> #define PARF_PM_CTRL_READY_ENTR_L23 BIT(2) >> +#define PARF_PM_CTRL_XMT_PME BIT(4) >> #define PARF_PM_CTRL_REQ_NOT_ENTR_L1 BIT(5) >> >> /* PARF_MHI_CLOCK_RESET_CTRL fields */ >> @@ -729,10 +730,40 @@ static void qcom_pcie_ep_init(struct dw_pcie_ep *ep) >> dw_pcie_ep_reset_bar(pci, bar); >> } >> >> +static int qcom_pcie_ep_wakeup_host(struct dw_pcie_ep *ep, u8 func_no, >> + enum pci_epc_wakeup_host_type type) >> +{ >> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); >> + struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); >> + struct device *dev = pci->dev; >> + u32 val; >> + >> + if (type == PCI_WAKEUP_TOGGLE_WAKE) { >> + dev_dbg(dev, "Waking up the host by toggling WAKE#\n"); >> + gpiod_set_value_cansleep(pcie_ep->wake, 1); >> + usleep_range(WAKE_DELAY_US, WAKE_DELAY_US + 500); >> + gpiod_set_value_cansleep(pcie_ep->wake, 0); >> + return 0; >> + >> + } else if (type == PCI_WAKEUP_SEND_PME) { >> + dev_dbg(dev, "Waking up the host using PME\n"); >> + val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); >> + val |= PARF_PM_CTRL_XMT_PME; >> + writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL); >> + >> + } else { >> + dev_err(dev, "Device is not in D3 state wakeup is not supported\n"); >> + return -EOPNOTSUPP; > This is not needed if you use bool. And this debug message is wrong btw since > you are not checking whether the device is in D3 state or not. > > - Mani I will change it bool and will remove these. - KC > >> + } >> + >> + return 0; >> +} >> + >> static const struct dw_pcie_ep_ops pci_ep_ops = { >> .ep_init = qcom_pcie_ep_init, >> .raise_irq = qcom_pcie_ep_raise_irq, >> .get_features = qcom_pcie_epc_get_features, >> + .wakeup_host = qcom_pcie_ep_wakeup_host, >> }; >> >> static int qcom_pcie_ep_probe(struct platform_device *pdev) >> -- >> 2.7.4 >>
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index e75aec4..e382b4b 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -89,6 +89,7 @@ /* PARF_PM_CTRL register fields */ #define PARF_PM_CTRL_REQ_EXIT_L1 BIT(1) #define PARF_PM_CTRL_READY_ENTR_L23 BIT(2) +#define PARF_PM_CTRL_XMT_PME BIT(4) #define PARF_PM_CTRL_REQ_NOT_ENTR_L1 BIT(5) /* PARF_MHI_CLOCK_RESET_CTRL fields */ @@ -729,10 +730,40 @@ static void qcom_pcie_ep_init(struct dw_pcie_ep *ep) dw_pcie_ep_reset_bar(pci, bar); } +static int qcom_pcie_ep_wakeup_host(struct dw_pcie_ep *ep, u8 func_no, + enum pci_epc_wakeup_host_type type) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); + struct device *dev = pci->dev; + u32 val; + + if (type == PCI_WAKEUP_TOGGLE_WAKE) { + dev_dbg(dev, "Waking up the host by toggling WAKE#\n"); + gpiod_set_value_cansleep(pcie_ep->wake, 1); + usleep_range(WAKE_DELAY_US, WAKE_DELAY_US + 500); + gpiod_set_value_cansleep(pcie_ep->wake, 0); + return 0; + + } else if (type == PCI_WAKEUP_SEND_PME) { + dev_dbg(dev, "Waking up the host using PME\n"); + val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); + val |= PARF_PM_CTRL_XMT_PME; + writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL); + + } else { + dev_err(dev, "Device is not in D3 state wakeup is not supported\n"); + return -EOPNOTSUPP; + } + + return 0; +} + static const struct dw_pcie_ep_ops pci_ep_ops = { .ep_init = qcom_pcie_ep_init, .raise_irq = qcom_pcie_ep_raise_irq, .get_features = qcom_pcie_epc_get_features, + .wakeup_host = qcom_pcie_ep_wakeup_host, }; static int qcom_pcie_ep_probe(struct platform_device *pdev)
Add wakeup host op to dw_pcie_ep_ops to wake up host. If the EPF asks to send PME trigger the inband PME by writing into the parf registers otherwise toggle wake signal. Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com> --- drivers/pci/controller/dwc/pcie-qcom-ep.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)