PCI: aardvark: Add support for PME interrupts
authorPali Rohár <pali@kernel.org>
Wed, 4 May 2022 16:57:49 +0000 (18:57 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 12 May 2022 10:30:32 +0000 (12:30 +0200)
commitcf7ef0e3029e43f85b525dd49420d56792a4e61f
tree1f150d2d3169f004444c2661aa148d5aecd6a5bb
parent4da95b9fdad3a7f788ab37e501f4a7468b6ced35
PCI: aardvark: Add support for PME interrupts

commit 0fc75d87454195885bd1a81fc7e6ce92572b6109 upstream.

Currently enabling PCI_EXP_RTSTA_PME bit in PCI_EXP_RTCTL register does
nothing. This is because PCIe PME driver expects to receive PCIe interrupt
defined in PCI_EXP_FLAGS_IRQ register, but aardvark hardware does not
trigger PCIe INTx/MSI interrupt for PME event, rather it triggers custom
aardvark interrupt which this driver is not processing yet.

Fix this issue by handling PME interrupt in advk_pcie_handle_int() and
chaining it to PCIe interrupt 0 with generic_handle_domain_irq() (since
aardvark sets PCI_EXP_FLAGS_IRQ to zero). With this change PCIe PME driver
finally starts receiving PME interrupt.

Link: https://lore.kernel.org/r/20220110015018.26359-17-kabel@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/pci/controller/pci-aardvark.c