PCI: pciehp: Don't enable HPIE when resuming in poll mode

PCIe hotplug can operate in poll mode without interrupt handlers using a
polling kthread only.  eb34da6 ("PCI: pciehp: Disable hotplug
interrupt during suspend") failed to consider that and enables HPIE
(Hot-Plug Interrupt Enable) unconditionally when resuming the Port.

Only set HPIE if non-poll mode is in use. This makes
pcie_enable_interrupt() match how pcie_enable_notification() already
handles HPIE.

Link: https://lore.kernel.org/r/20250321162114.3939-1-ilpo.jarvinen@linux.intel.com
Fixes: eb34da6 ("PCI: pciehp: Disable hotplug interrupt during suspend")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>

Author: ij-intel

drivers/pci/hotplug/pciehp_hpc.c

@@ -842,7 +842,9 @@ void pcie_enable_interrupt(struct controller *ctrl)
 {
 	u16 mask;
 
-	mask = PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_DLLSCE;
+	mask = PCI_EXP_SLTCTL_DLLSCE;
+	if (!pciehp_poll_mode)
+		mask |= PCI_EXP_SLTCTL_HPIE;
 	pcie_write_cmd(ctrl, mask, mask);
 }