From: Vidya Sagar Date: Thu, 21 Jul 2022 14:20:47 +0000 (+0530) Subject: PCI: tegra194: Clear bandwidth management status X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6c12e3e139ab7511c9e9d6bc2b363aa4e59fc8ce;p=linux.git 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: Vidya Sagar Signed-off-by: Bjorn Helgaas --- diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index 23377425952aa..5f1798d37572a 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -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);