linux-kernel - [PATCH 4/4] PCI: qcom-ep: Mask PTM

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Message-Id: <20250218-pcie-qcom-ptm-v1-4-16d7e480d73e@linaro.org>
Date: Tue, 18 Feb 2025 20:06:43 +0530
From: Manivannan Sadhasivam via B4 Relay <devnull+manivannan.sadhasivam.linaro.org@...nel.org>
To: Shuai Xue <xueshuai@...ux.alibaba.com>, 
 Jing Zhang <renyu.zj@...ux.alibaba.com>, Will Deacon <will@...nel.org>, 
 Mark Rutland <mark.rutland@....com>, Jingoo Han <jingoohan1@...il.com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Rob Herring <robh@...nel.org>
Cc: Shradha Todi <shradha.t@...sung.com>, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-perf-users@...r.kernel.org, 
 linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 4/4] PCI: qcom-ep: Mask PTM_UPDATING interrupt

From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

When PTM is enabled, PTM_UPDATING interrupt will be fired for each PTM
context update, which will be once every 10ms in the case of auto context
update. Since the interrupt is not strictly needed for making use of PTM,
mask it to avoid the overhead of processing it.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/pci/controller/dwc/pcie-qcom-ep.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index c08f64d7a825..940edb7be1b9 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -60,6 +60,7 @@
 #define PARF_DEVICE_TYPE			0x1000
 #define PARF_BDF_TO_SID_CFG			0x2c00
 #define PARF_INT_ALL_5_MASK			0x2dcc
+#define PARF_INT_ALL_3_MASK			0x2e18
 
 /* PARF_INT_ALL_{STATUS/CLEAR/MASK} register fields */
 #define PARF_INT_ALL_LINK_DOWN			BIT(1)
@@ -132,6 +133,9 @@
 /* PARF_INT_ALL_5_MASK fields */
 #define PARF_INT_ALL_5_MHI_RAM_DATA_PARITY_ERR	BIT(0)
 
+/* PARF_INT_ALL_3_MASK fields */
+#define PARF_INT_ALL_3_PTM_UPDATING		BIT(4)
+
 /* ELBI registers */
 #define ELBI_SYS_STTS				0x08
 #define ELBI_CS2_ENABLE				0xa4
@@ -497,6 +501,10 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
 		writel_relaxed(val, pcie_ep->parf + PARF_INT_ALL_5_MASK);
 	}
 
+	val = readl_relaxed(pcie_ep->parf + PARF_INT_ALL_3_MASK);
+	val &= ~PARF_INT_ALL_3_PTM_UPDATING;
+	writel_relaxed(val, pcie_ep->parf + PARF_INT_ALL_3_MASK);
+
 	ret = dw_pcie_ep_init_registers(&pcie_ep->pci.ep);
 	if (ret) {
 		dev_err(dev, "Failed to complete initialization: %d\n", ret);

-- 
2.25.1