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PCI: brcmstb: Do not turn off WOL regulators on suspend 

If any downstream device can be a wakeup device, do not turn off the
regulators as the device will need them on.

Link: https://lore.kernel.org/r/20220106160332.2143-8-jim2101024@gmail.com
Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Jim Quinlan 2022-01-06 11:03:30 -05:00 committed by Bjorn Helgaas
parent 93e41f3fca
commit 11ed8b8624
1 changed files with 44 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
drivers/pci/controller/pcie-brcmstb.c
View File

@ -310,6 +310,7 @@ struct brcm_pcie {
void (*bridge_sw_init_set)(struct brcm_pcie *pcie, u32 val);
bool refusal_mode;
struct subdev_regulators *sr;
bool ep_wakeup_capable;
};
/*
@ -1278,9 +1279,21 @@ static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
pcie->bridge_sw_init_set(pcie, 1);
}
static int pci_dev_may_wakeup(struct pci_dev *dev, void *data)
{
bool *ret = data;
if (device_may_wakeup(&dev->dev)) {
*ret = true;
dev_info(&dev->dev, "disable cancelled for wake-up device\n");
}
return (int) *ret;
}
static int brcm_pcie_suspend(struct device *dev)
{
struct brcm_pcie *pcie = dev_get_drvdata(dev);
struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
int ret;
brcm_pcie_turn_off(pcie);
@ -1299,11 +1312,22 @@ static int brcm_pcie_suspend(struct device *dev)
}
if (pcie->sr) {
ret = regulator_bulk_disable(pcie->sr->num_supplies, pcie->sr->supplies);
if (ret) {
dev_err(dev, "Could not turn off regulators\n");
reset_control_reset(pcie->rescal);
return ret;
/*
* Now turn off the regulators, but if at least one
* downstream device is enabled as a wake-up source, do not
* turn off regulators.
*/
pcie->ep_wakeup_capable = false;
pci_walk_bus(bridge->bus, pci_dev_may_wakeup,
&pcie->ep_wakeup_capable);
if (!pcie->ep_wakeup_capable) {
ret = regulator_bulk_disable(pcie->sr->num_supplies,
pcie->sr->supplies);
if (ret) {
dev_err(dev, "Could not turn off regulators\n");
reset_control_reset(pcie->rescal);
return ret;
}
}
}
clk_disable_unprepare(pcie->clk);
@ -1324,10 +1348,21 @@ static int brcm_pcie_resume(struct device *dev)
return ret;
if (pcie->sr) {
ret = regulator_bulk_enable(pcie->sr->num_supplies, pcie->sr->supplies);
if (ret) {
dev_err(dev, "Could not turn on regulators\n");
goto err_disable_clk;
if (pcie->ep_wakeup_capable) {
/*
* We are resuming from a suspend. In the suspend we
* did not disable the power supplies, so there is
* no need to enable them (and falsely increase their
* usage count).
*/
pcie->ep_wakeup_capable = false;
} else {
ret = regulator_bulk_enable(pcie->sr->num_supplies,
pcie->sr->supplies);
if (ret) {
dev_err(dev, "Could not turn on regulators\n");
goto err_disable_clk;
}
}
}