[PATCH v4 04/16] PCI: dwc: layerscape-ep: Use cached PCIe capability offset

[Hans Zhang <18255117159@163.com>]

Replace the dw_pcie_find_capability(pci, PCI_CAP_ID_EXP) calls in
ls_pcie_ep_probe() and ls_pcie_ep_event_handler() with
dw_pcie_get_pcie_cap().

The probe reads the Link Capabilities register to save the values
configured by the Reset Configuration Word anyway, so the offset is
cached there. The link down event handler runs in hardirq context and
can then simply reuse the cached value instead of walking the
capability list every time the link goes down.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Hans Zhang <18255117159@163.com>
---
 drivers/pci/controller/dwc/pci-layerscape-ep.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c
index 527c57114dcf..113be247b01b 100644
--- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
+++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
@@ -84,7 +84,7 @@ static irqreturn_t ls_pcie_ep_event_handler(int irq, void *dev_id)
 
 	if (val & PEX_PF0_PME_MES_DR_LUD) {
 
-		offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
+		offset = dw_pcie_get_pcie_cap(pci);
 
 		/*
 		 * The values of the Maximum Link Width and Supported Link
@@ -268,7 +268,7 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, pcie);
 
-	offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
+	offset = dw_pcie_get_pcie_cap(pci);
 	pcie->lnkcap = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
 
 	ret = dw_pcie_ep_init(&pci->ep);
-- 
2.43.0


_______________________________________________
linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic