From: Ajay Agarwal <ajayagarwal@google.com>
To: "Jingoo Han" <jingoohan1@gmail.com>,
"Johan Hovold" <johan+linaro@kernel.org>,
"Manivannan Sadhasivam" <manivannan.sadhasivam@linaro.org>,
"Jon Hunter" <jonathanh@nvidia.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Rob Herring" <robh@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Manu Gautam" <manugautam@google.com>,
"Doug Zobel" <zobel@google.com>,
"William McVicker" <willmcvicker@google.com>,
"Serge Semin" <fancer.lancer@gmail.com>,
"Robin Murphy" <robin.murphy@arm.com>
Cc: linux-pci@vger.kernel.org, Ajay Agarwal <ajayagarwal@google.com>
Subject: [PATCH v1 1/2] PCI: dwc: Add helper function to print link status
Date: Wed, 24 Jan 2024 14:55:32 +0530 [thread overview]
Message-ID: <20240124092533.1267836-2-ajayagarwal@google.com> (raw)
In-Reply-To: <20240124092533.1267836-1-ajayagarwal@google.com>
Add helper function `dw_pcie_print_link_status` to print the link
speed and width. This function can be called from various places
to print the link status when desired.
Signed-off-by: Ajay Agarwal <ajayagarwal@google.com>
---
drivers/pci/controller/dwc/pcie-designware.c | 20 +++++++++++++-------
drivers/pci/controller/dwc/pcie-designware.h | 1 +
2 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 250cf7f40b85..c067d2e960cf 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -645,9 +645,20 @@ void dw_pcie_disable_atu(struct dw_pcie *pci, u32 dir, int index)
dw_pcie_writel_atu(pci, dir, index, PCIE_ATU_REGION_CTRL2, 0);
}
-int dw_pcie_wait_for_link(struct dw_pcie *pci)
+void dw_pcie_print_link_status(struct dw_pcie *pci)
{
u32 offset, val;
+
+ offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
+ val = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA);
+
+ dev_info(pci->dev, "PCIe Gen.%u x%u link up\n",
+ FIELD_GET(PCI_EXP_LNKSTA_CLS, val),
+ FIELD_GET(PCI_EXP_LNKSTA_NLW, val));
+}
+
+int dw_pcie_wait_for_link(struct dw_pcie *pci)
+{
int retries;
/* Check if the link is up or not */
@@ -663,12 +674,7 @@ int dw_pcie_wait_for_link(struct dw_pcie *pci)
return -ETIMEDOUT;
}
- offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
- val = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA);
-
- dev_info(pci->dev, "PCIe Gen.%u x%u link up\n",
- FIELD_GET(PCI_EXP_LNKSTA_CLS, val),
- FIELD_GET(PCI_EXP_LNKSTA_NLW, val));
+ dw_pcie_print_link_status(pci);
return 0;
}
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 55ff76e3d384..164214a7219a 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -447,6 +447,7 @@ void dw_pcie_setup(struct dw_pcie *pci);
void dw_pcie_iatu_detect(struct dw_pcie *pci);
int dw_pcie_edma_detect(struct dw_pcie *pci);
void dw_pcie_edma_remove(struct dw_pcie *pci);
+void dw_pcie_print_link_status(struct dw_pcie *pci);
int dw_pcie_suspend_noirq(struct dw_pcie *pci);
int dw_pcie_resume_noirq(struct dw_pcie *pci);
--
2.43.0.429.g432eaa2c6b-goog
next prev parent reply other threads:[~2024-01-24 9:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-24 9:25 [PATCH v1 0/2] PCI: dwc: Remove the delay from PCIe probe path Ajay Agarwal
2024-01-24 9:25 ` Ajay Agarwal [this message]
2024-01-24 9:25 ` [PATCH v1 2/2] PCI: dwc: Wait for link up only if link is started Ajay Agarwal
2024-01-29 6:26 ` Manivannan Sadhasivam
2024-01-29 6:23 ` [PATCH v1 0/2] PCI: dwc: Remove the delay from PCIe probe path Manivannan Sadhasivam
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