diff mbox series

[01/15] PCI: pci-dra7xx: Prepare for deferred probe with module_platform_driver

Message ID 20210126124004.52550-2-tony@atomide.com
State Superseded
Headers show
Series [01/15] PCI: pci-dra7xx: Prepare for deferred probe with module_platform_driver | expand

Commit Message

Tony Lindgren Jan. 26, 2021, 12:39 p.m. UTC 
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 module_platform_driver_probe 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: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---

Can you guys please review test and ack if this looks OK? I'd like to
apply this together with the series to drop dra7 platform data as it's
not needed earlier.

---
 drivers/pci/controller/dwc/pci-dra7xx.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

Comments

Tony Lindgren Jan. 28, 2021, 8:54 a.m. UTC | #1 
Hi,

* Tony Lindgren <tony@atomide.com> [210126 12:41]:
> 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 module_platform_driver_probe uses platform_driver_register().


I just noticed that the above is confusing with module_platform_driver_probe
mentioned twice. It should be:

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

Regards,

Tony
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -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);