linux-kernel - [PATCH v7 6/7] PCI: Bring out the pcie link speed to MBps logic to new function

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Message-ID: <20240223-opp_support-v7-6-10b4363d7e71@quicinc.com>
Date: Fri, 23 Feb 2024 20:18:03 +0530
From: Krishna chaitanya chundru <quic_krichai@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring
	<robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Rob Herring
	<robh+dt@...nel.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Brian Masney
	<bmasney@...hat.com>, Georgi Djakov <djakov@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <vireshk@...nel.org>, <quic_vbadigan@...cinc.com>,
        <quic_skananth@...cinc.com>, <quic_nitegupt@...cinc.com>,
        <quic_parass@...cinc.com>,
        Krishna chaitanya chundru
	<quic_krichai@...cinc.com>
Subject: [PATCH v7 6/7] PCI: Bring out the pcie link speed to MBps logic to
 new function

Bring the switch case in pcie_link_speed_mbps to new function to
the header file so that it can be used in other places like
in controller driver.

Create a new macro to convert from MBps to frequency.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
---
 drivers/pci/pci.c | 19 +------------------
 drivers/pci/pci.h | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 18 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d8f11a078924..b441ab862a8d 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -6309,24 +6309,7 @@ int pcie_link_speed_mbps(struct pci_dev *pdev)
 	if (err)
 		return err;
 
-	switch (to_pcie_link_speed(lnksta)) {
-	case PCIE_SPEED_2_5GT:
-		return 2500;
-	case PCIE_SPEED_5_0GT:
-		return 5000;
-	case PCIE_SPEED_8_0GT:
-		return 8000;
-	case PCIE_SPEED_16_0GT:
-		return 16000;
-	case PCIE_SPEED_32_0GT:
-		return 32000;
-	case PCIE_SPEED_64_0GT:
-		return 64000;
-	default:
-		break;
-	}
-
-	return -EINVAL;
+	return pcie_link_speed_to_mbps(to_pcie_link_speed(lnksta));
 }
 EXPORT_SYMBOL(pcie_link_speed_mbps);
 
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 2336a8d1edab..82e715ebe383 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -282,6 +282,30 @@ void pci_bus_put(struct pci_bus *bus);
 	 (speed) == PCIE_SPEED_2_5GT  ?  2500*8/10 : \
 	 0)
 
+static inline int pcie_link_speed_to_mbps(enum pci_bus_speed speed)
+{
+	switch (speed) {
+	case PCIE_SPEED_2_5GT:
+		return 2500;
+	case PCIE_SPEED_5_0GT:
+		return 5000;
+	case PCIE_SPEED_8_0GT:
+		return 8000;
+	case PCIE_SPEED_16_0GT:
+		return 16000;
+	case PCIE_SPEED_32_0GT:
+		return 32000;
+	case PCIE_SPEED_64_0GT:
+		return 64000;
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+
+#define PCIE_MBS2FREQ(speed) (pcie_link_speed_to_mbps(speed) * 1000)
+
 const char *pci_speed_string(enum pci_bus_speed speed);
 enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev);
 enum pcie_link_width pcie_get_width_cap(struct pci_dev *dev);

-- 
2.42.0