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* [PATCH] PCI: tegra: Print -EPROBE_DEFER error message at debug level
@ 2020-03-19 13:12 Thierry Reding
  2020-03-19 17:04 ` Vidya Sagar
  2020-03-19 18:05 ` Lorenzo Pieralisi
  0 siblings, 2 replies; 5+ messages in thread
From: Thierry Reding @ 2020-03-19 13:12 UTC (permalink / raw)
  To: Lorenzo Pieralisi, Andrew Murray, Bjorn Helgaas
  Cc: Jon Hunter, Vidya Sagar, linux-pci, linux-tegra

From: Thierry Reding <treding@nvidia.com>

Probe deferral is an expected error condition that will usually be
recovered from. Print such error messages at debug level to make them
available for diagnostic purposes when building with debugging enabled
and hide them otherwise to not spam the kernel log with them.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 drivers/pci/controller/dwc/pcie-tegra194.c | 42 ++++++++++++++++++----
 1 file changed, 35 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 97d3f3db1020..e4870fa6ce9c 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1159,17 +1159,31 @@ static int tegra_pcie_dw_parse_dt(struct tegra_pcie_dw *pcie)
 	/* Endpoint mode specific DT entries */
 	pcie->pex_rst_gpiod = devm_gpiod_get(pcie->dev, "reset", GPIOD_IN);
 	if (IS_ERR(pcie->pex_rst_gpiod)) {
-		dev_err(pcie->dev, "Failed to get PERST GPIO: %ld\n",
-			PTR_ERR(pcie->pex_rst_gpiod));
-		return PTR_ERR(pcie->pex_rst_gpiod);
+		int err = PTR_ERR(pcie->pex_rst_gpiod);
+		const char *level = KERN_ERR;
+
+		if (err == -EPROBE_DEFER)
+			level = KERN_DEBUG;
+
+		dev_printk(level, pcie->dev,
+			   dev_fmt("Failed to get PERST GPIO: %d\n"),
+			   err);
+		return err;
 	}
 
 	pcie->pex_refclk_sel_gpiod = devm_gpiod_get(pcie->dev,
 						    "nvidia,refclk-select",
 						    GPIOD_OUT_HIGH);
 	if (IS_ERR(pcie->pex_refclk_sel_gpiod)) {
-		dev_info(pcie->dev, "Failed to get REFCLK select GPIOs: %ld\n",
-			 PTR_ERR(pcie->pex_refclk_sel_gpiod));
+		int err = PTR_ERR(pcie->pex_refclk_sel_gpiod);
+		const char *level = KERN_ERR;
+
+		if (err == -EPROBE_DEFER)
+			level = KERN_DEBUG;
+
+		dev_printk(level, pcie->dev,
+			   dev_fmt("Failed to get REFCLK select GPIOs: %d\n"),
+			   err);
 		pcie->pex_refclk_sel_gpiod = NULL;
 	}
 
@@ -2058,13 +2072,27 @@ static int tegra_pcie_dw_probe(struct platform_device *pdev)
 
 	ret = tegra_pcie_dw_parse_dt(pcie);
 	if (ret < 0) {
-		dev_err(dev, "Failed to parse device tree: %d\n", ret);
+		const char *level = KERN_ERR;
+
+		if (ret == -EPROBE_DEFER)
+			level = KERN_DEBUG;
+
+		dev_printk(level, dev,
+			   dev_fmt("Failed to parse device tree: %d\n"),
+			   ret);
 		return ret;
 	}
 
 	ret = tegra_pcie_get_slot_regulators(pcie);
 	if (ret < 0) {
-		dev_err(dev, "Failed to get slot regulators: %d\n", ret);
+		const char *level = KERN_ERR;
+
+		if (ret == -EPROBE_DEFER)
+			level = KERN_DEBUG;
+
+		dev_printk(level, dev,
+			   dev_fmt("Failed to get slot regulators: %d\n"),
+			   ret);
 		return ret;
 	}
 
-- 
2.24.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2020-03-23 17:22 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-19 13:12 [PATCH] PCI: tegra: Print -EPROBE_DEFER error message at debug level Thierry Reding
2020-03-19 17:04 ` Vidya Sagar
2020-03-19 18:05 ` Lorenzo Pieralisi
2020-03-23 13:34   ` Thierry Reding
2020-03-23 17:21     ` Lorenzo Pieralisi

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