Re: [PATCH v7 2/4] PCI: qcom-ep: Add support for D-state change notification
From: Mayank Rana
Date: Wed Jul 10 2024 - 16:29:36 EST
On 7/10/2024 4:08 AM, Krishna chaitanya chundru wrote:
Add support to pass D-state change notification to Endpoint
function driver.
Read perst value to determine if the link is in D3Cold/D3hot.
Reviewed-by: Manivannan Sadhasivam <mani@xxxxxxxxxx>
Signed-off-by: Krishna chaitanya chundru <quic_krichai@xxxxxxxxxxx>
---
drivers/pci/controller/dwc/pcie-qcom-ep.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 236229f66c80..817fad805c51 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -648,6 +648,7 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
struct device *dev = pci->dev;
u32 status = readl_relaxed(pcie_ep->parf + PARF_INT_ALL_STATUS);
u32 mask = readl_relaxed(pcie_ep->parf + PARF_INT_ALL_MASK);
+ pci_power_t state;
u32 dstate, val;
writel_relaxed(status, pcie_ep->parf + PARF_INT_ALL_CLEAR);
@@ -671,11 +672,16 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
dstate = dw_pcie_readl_dbi(pci, DBI_CON_STATUS) &
DBI_CON_STATUS_POWER_STATE_MASK;
dev_dbg(dev, "Received D%d state event\n", dstate);
- if (dstate == 3) {
+ state = dstate;
+ if (dstate == PCI_D3hot) {
val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
val |= PARF_PM_CTRL_REQ_EXIT_L1;
writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL);
Can you please also check that do we really need to bring link back out
of L1/L1SS on receiving D3 hot ?
+ if (gpiod_get_value(pcie_ep->reset))
+ state = PCI_D3cold;
}
+ pci_epc_dstate_notify(pci->ep.epc, state);
} else if (FIELD_GET(PARF_INT_ALL_LINK_UP, status)) {
dev_dbg(dev, "Received Linkup event. Enumeration complete!\n");
dw_pcie_ep_linkup(&pci->ep);
Regards,
Mayank