linux-kernel - [PATCH 2/4] PCI: qcom: Cache last icc bandwidth

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Date: Wed, 27 Dec 2023 23:17:20 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Manivannan Sadhasivam <mani@...nel.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Stanimir Varbanov <svarbanov@...sol.com>, 
 Andrew Murray <amurray@...goodpenguin.co.uk>, Vinod Koul <vkoul@...nel.org>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 2/4] PCI: qcom: Cache last icc bandwidth

In preparation for shutting down the RC, cache the last interconnect
bandwidth vote to allow for icc tag setting.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 1c5ab8c4ff39..a02dc197c495 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -240,6 +240,7 @@ struct qcom_pcie {
 	struct phy *phy;
 	struct gpio_desc *reset;
 	struct icc_path *icc_mem;
+	u32 last_bw;
 	const struct qcom_pcie_cfg *cfg;
 	struct dentry *debugfs;
 	bool suspended;
@@ -1387,6 +1388,8 @@ static int qcom_pcie_icc_init(struct qcom_pcie *pcie)
 		return ret;
 	}
 
+	pcie->last_bw = QCOM_PCIE_LINK_SPEED_TO_BW(1);
+
 	return 0;
 }
 
@@ -1415,6 +1418,8 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
 		dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
 			ret);
 	}
+
+	pcie->last_bw = width * QCOM_PCIE_LINK_SPEED_TO_BW(speed);
 }
 
 static int qcom_pcie_link_transition_count(struct seq_file *s, void *data)
@@ -1578,6 +1583,8 @@ static int qcom_pcie_suspend_noirq(struct device *dev)
 		return ret;
 	}
 
+	pcie->last_bw = kBps_to_icc(1);
+
 	/*
 	 * Turn OFF the resources only for controllers without active PCIe
 	 * devices. For controllers with active devices, the resources are kept

-- 
2.43.0