[PATCH] xhci: Use pm_runtime_get to prevent RPM on unsupported systems

[PATCH] xhci: Use pm_runtime_get to prevent RPM on unsupported systems

[Basavaraj Natikar]

Use pm_runtime_put in the remove function and pm_runtime_get to disable
RPM on platforms that don't support runtime D3, as re-enabling it through
sysfs auto power control may cause the controller to malfunction. This
can lead to issues such as hotplug devices not being detected due to
failed interrupt generation.

Fixes: a5d6264b638e ("xhci: Enable RPM on controllers that support low-power states")
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
---
 drivers/usb/host/xhci-pci.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 7e538194a0a4..cb07cee9ed0c 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -640,7 +640,7 @@ int xhci_pci_common_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	pm_runtime_put_noidle(&dev->dev);
 
 	if (pci_choose_state(dev, PMSG_SUSPEND) == PCI_D0)
-		pm_runtime_forbid(&dev->dev);
+		pm_runtime_get(&dev->dev);
 	else if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
 		pm_runtime_allow(&dev->dev);
 
@@ -683,7 +683,9 @@ void xhci_pci_remove(struct pci_dev *dev)
 
 	xhci->xhc_state |= XHCI_STATE_REMOVING;
 
-	if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
+	if (pci_choose_state(dev, PMSG_SUSPEND) == PCI_D0)
+		pm_runtime_put(&dev->dev);
+	else if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
 		pm_runtime_forbid(&dev->dev);
 
 	if (xhci->shared_hcd) {
-- 
2.25.1

Re: [PATCH] xhci: Use pm_runtime_get to prevent RPM on unsupported systems

[Johan Hovold]

On Thu, Oct 24, 2024 at 04:51:17PM +0530, Basavaraj Natikar wrote:
> Use pm_runtime_put in the remove function and pm_runtime_get to disable
> RPM on platforms that don't support runtime D3, as re-enabling it through
> sysfs auto power control may cause the controller to malfunction. This
> can lead to issues such as hotplug devices not being detected due to
> failed interrupt generation.
> 
> Fixes: a5d6264b638e ("xhci: Enable RPM on controllers that support low-power states")
> Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
> ---

This is a new version of this patch:

	https://lore.kernel.org/all/20240925161520.2736895-1-Basavaraj.Natikar@amd.com/

so please resend a v3 with a changelog here.

Also remember to CC people reviewing your patches when resubmitting.

Johan

Re: [PATCH] xhci: Use pm_runtime_get to prevent RPM on unsupported systems

[Basavaraj Natikar]

On 10/24/2024 6:36 PM, Johan Hovold wrote:
> On Thu, Oct 24, 2024 at 04:51:17PM +0530, Basavaraj Natikar wrote:
>> Use pm_runtime_put in the remove function and pm_runtime_get to disable
>> RPM on platforms that don't support runtime D3, as re-enabling it through
>> sysfs auto power control may cause the controller to malfunction. This
>> can lead to issues such as hotplug devices not being detected due to
>> failed interrupt generation.
>>
>> Fixes: a5d6264b638e ("xhci: Enable RPM on controllers that support low-power states")
>> Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
>> ---
> This is a new version of this patch:
>
> 	https://lore.kernel.org/all/20240925161520.2736895-1-Basavaraj.Natikar@amd.com/
>
> so please resend a v3 with a changelog here.
>
> Also remember to CC people reviewing your patches when resubmitting.

Sure Johan, I sent changes in v3.


Thanks,
--
Basavaraj

>
> Johan