diff mbox series

[v3,3/3] PCI: j721e: Add warnings on num-lanes misconfiguration

Message ID 20221020012911.305139-4-mranostay@ti.com (mailing list archive)
State Superseded
Delegated to: Lorenzo Pieralisi
Headers show
Series PCI: add 4x lane support for pci-j721e controllers | expand

Commit Message

Matt Ranostay Oct. 20, 2022, 1:29 a.m. UTC 
Added dev_warn messages to alert of devicetree misconfigurations
for incorrect num-lanes setting, or the lack of one being defined.

Signed-off-by: Matt Ranostay <mranostay@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
---
 drivers/pci/controller/cadence/pci-j721e.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

Comments

Bjorn Helgaas Oct. 20, 2022, 4:58 p.m. UTC | #1 
On Wed, Oct 19, 2022 at 06:29:11PM -0700, Matt Ranostay wrote:
> Added dev_warn messages to alert of devicetree misconfigurations
> for incorrect num-lanes setting, or the lack of one being defined.

s/Added/Add/ if you repost for anything else:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=v5.16#n95

> +		dev_warn(dev, "defined num-lanes %u is greater than the "
> +			      "allowed maximum of %u, defaulting to 1\n",
> +			      num_lanes, data->max_lanes);

Don't repost just for this, but I generally prefer to keep printf
strings intact even if they exceed 80 columns, because it makes it
easier for someone to grep for something like
"greater than the allowed".

> +		num_lanes = 1;
> +	}
>  	pcie->num_lanes = num_lanes;
>  
>  	if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)))
> -- 
> 2.38.GIT
>
diff mbox series

Patch

diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
index 0a537f2d5078..2922be2ac4e1 100644
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c
@@ -441,8 +441,17 @@  static int j721e_pcie_probe(struct platform_device *pdev)
 	pcie->user_cfg_base = base;
 
 	ret = of_property_read_u32(node, "num-lanes", &num_lanes);
-	if (ret || num_lanes > data->max_lanes)
+	if (ret) {
+		dev_warn(dev, "no num-lanes defined, defaulting to 1\n");
 		num_lanes = 1;
+	}
+
+	if (num_lanes > data->max_lanes) {
+		dev_warn(dev, "defined num-lanes %u is greater than the "
+			      "allowed maximum of %u, defaulting to 1\n",
+			      num_lanes, data->max_lanes);
+		num_lanes = 1;
+	}
 	pcie->num_lanes = num_lanes;
 
 	if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)))