linux-kernel - [PATCH] PCI: qcom: Add interconnect bandwidth for PCIe Gen4

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Message-Id: <20230924160713.217086-1-manivannan.sadhasivam@linaro.org>
Date:   Sun, 24 Sep 2023 18:07:13 +0200
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     lpieralisi@...nel.org, kw@...ux.com
Cc:     andersson@...nel.org, konrad.dybcio@...aro.org,
        bhelgaas@...gle.com, linux-arm-msm@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        abel.vesa@...aro.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH] PCI: qcom: Add interconnect bandwidth for PCIe Gen4

PCIe Gen4 supports the interconnect bandwidth of 1969 MBps. So let's add
the bandwidth support in the driver. Otherwise, the default bandwidth of
985 MBps will be used.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 297442c969b6..6853123f92c1 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1384,11 +1384,14 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
 	case 2:
 		bw = MBps_to_icc(500);
 		break;
+	case 3:
+		bw = MBps_to_icc(985);
+		break;
 	default:
 		WARN_ON_ONCE(1);
 		fallthrough;
-	case 3:
-		bw = MBps_to_icc(985);
+	case 4:
+		bw = MBps_to_icc(1969);
 		break;
 	}
 
-- 
2.25.1