Commit 6c12e3e1 authored by Vidya Sagar's avatar Vidya Sagar Committed by Bjorn Helgaas
Browse files

PCI: tegra194: Clear bandwidth management status 

In the event of a bandwidth management interrupt, clear the bandwidth
management status in the configuration space also along with clearing
corresponding status in the application logic register to avoid slew
of interrupts.

Link: https://lore.kernel.org/r/20220721142052.25971-12-vidyas@nvidia.com


Signed-off-by: default avatarVidya Sagar <vidyas@nvidia.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 6646e99b

drivers/pci/controller/dwc/pcie-tegra194.c

+6 −0
Original line number Diff line number Diff line
@@ -370,6 +370,12 @@ static irqreturn_t tegra_pcie_rp_irq_handler(int irq, void *arg) 
			apply_bad_link_workaround(pp);

		}

		if (status_l1 & APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS) {

			val_w = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base +

						  PCI_EXP_LNKSTA);

			val_w |= PCI_EXP_LNKSTA_LBMS;

			dw_pcie_writew_dbi(pci, pcie->pcie_cap_base +

					   PCI_EXP_LNKSTA, val_w);



			appl_writel(pcie,

				    APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS,

				    APPL_INTR_STATUS_L1_8_0);