linux-kernel - [PATCH V6 11/16] PCI: tegra194: Clear bandwidth management status

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Date:   Thu, 21 Jul 2022 19:50:47 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <bhelgaas@...gle.com>, <lpieralisi@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>
CC:     <kw@...ux.com>, <kishon@...com>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <vidyas@...dia.com>, <sagar.tv@...il.com>
Subject: [PATCH V6 11/16] 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.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
V6:
* New addition in V6 based on Bjorn's review comment

 drivers/pci/controller/dwc/pcie-tegra194.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 23377425952a..5f1798d37572 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);
-- 
2.17.1