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PCI: pci-dra7xx: Prepare for deferred probe with module_platform_driver 

After updating pci-dra7xx driver to probe with ti-sysc and genpd, I
noticed that dra7xx_pcie_probe() would not run if a power-domains property
was configured for the interconnect target module.

Turns out that module_platform_driver_probe uses platform_driver_probe(),
while builtin_platform_driver uses platform_driver_register().

Only platform_driver_register() works for deferred probe as noted in the
comments for __platform_driver_probe() in drivers/base/platform.c with a
line saying "Note that this is incompatible with deferred probing".

With module_platform_driver_probe, we have platform_driver_probe() produce
-ENODEV error at device_initcall() level, and no further attempts are done.
Let's fix this by using module_platform_driver instead.

Note this is not an issue currently as we probe devices with simple-bus,
and only is needed as we start probing the device with ti-sysc, or when
probed with simple-pm-bus.

Note that we must now also remove __init for probe related functions to
avoid a section mismatch warning.

Cc: linux-pci@vger.kernel.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2021-03-10 14:01:00 +02:00
parent 7f7acef857
commit e259c2926c
1 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/pci/controller/dwc/pci-dra7xx.c
View File

@ -443,8 +443,8 @@ static const struct dw_pcie_ep_ops pcie_ep_ops = {
.get_features = dra7xx_pcie_get_features,
};
static int __init dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
struct platform_device *pdev)
static int dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
struct platform_device *pdev)
{
int ret;
struct dw_pcie_ep *ep;
@ -472,8 +472,8 @@ static int __init dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
return 0;
}
static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
struct platform_device *pdev)
static int dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
struct platform_device *pdev)
{
int ret;
struct dw_pcie *pci = dra7xx->pci;
@ -682,7 +682,7 @@ static int dra7xx_pcie_configure_two_lane(struct device *dev,
return 0;
}
static int __init dra7xx_pcie_probe(struct platform_device *pdev)
static int dra7xx_pcie_probe(struct platform_device *pdev)
{
u32 reg;
int ret;
@ -938,6 +938,7 @@ static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
};
static struct platform_driver dra7xx_pcie_driver = {
.probe = dra7xx_pcie_probe,
.driver = {
.name = "dra7-pcie",
.of_match_table = of_dra7xx_pcie_match,
@ -946,4 +947,4 @@ static struct platform_driver dra7xx_pcie_driver = {
},
.shutdown = dra7xx_pcie_shutdown,
};
builtin_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);
builtin_platform_driver(dra7xx_pcie_driver);