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Message-Id: <20221113081006.3624-1-jundongsong1@gmail.com>
Date: Sun, 13 Nov 2022 16:10:06 +0800
From: Harry Song <jundongsong1@...il.com>
To: helgaas@...nel.org
Cc: bhelgaas@...gle.com, gustavo.pimentel@...opsys.com,
jingoohan1@...il.com, jundongsong1@...il.com, kw@...ux.com,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
lpieralisi@...nel.org, robh@...nel.org
Subject: [PATCH V2] PCI: dwc: Warn about invalid 'max-link-speed' from DT
of_pci_get_max_link_speed() may return a negative value,
causing the controller to not set the speed correctly.
Add a warning in case the driver engineer misses it.
Signed-off-by: Harry Song <jundongsong1@...il.com>
---
V2: Change the description of the subject line;
Remove unnecessary "unlikely";
Thanks for your comment, V1 is this one:
https://lore.kernel.org/lkml/20221110213239.GA672651@bhelgaas/
drivers/pci/controller/dwc/pcie-designware-ep.c | 5 ++++-
drivers/pci/controller/dwc/pcie-designware-host.c | 5 ++++-
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 83ddb1902..19892e939 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -739,8 +739,11 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
return -ENOMEM;
ep->outbound_addr = addr;
- if (pci->link_gen < 1)
+ if (pci->link_gen < 1) {
pci->link_gen = of_pci_get_max_link_speed(np);
+ if (pci->link_gen < 0)
+ dev_warn(dev, "Invalid to get max-link-speed from DT\n");
+ }
epc = devm_pci_epc_create(dev, &epc_ops);
if (IS_ERR(epc)) {
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 39f3b37d4..42633ec8c 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -429,8 +429,11 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
pp->io_base = pci_pio_to_address(win->res->start);
}
- if (pci->link_gen < 1)
+ if (pci->link_gen < 1) {
pci->link_gen = of_pci_get_max_link_speed(np);
+ if (pci->link_gen < 0)
+ dev_warn(dev, "Invalid to get max-link-speed from DT\n");
+ }
/* Set default bus ops */
bridge->ops = &dw_pcie_ops;
--
2.25.1
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