From: Manish Chopra manishc@marvell.com
[ Upstream commit 2eb9625a3a32251ecea470cd576659a3a03b4e59 ]
While performing certain power-off sequences, PCI drivers are called to suspend and resume their underlying devices through PCI PM (power management) interface. However this NIC hardware does not support PCI PM suspend/resume operations so system wide suspend/resume leads to bad MFW (management firmware) state which causes various follow-up errors in driver when communicating with the device/firmware afterwards.
To fix this driver implements PCI PM suspend handler to indicate unsupported operation to the PCI subsystem explicitly, thus avoiding system to go into suspended/standby mode.
Without this fix device/firmware does not recover unless system is power cycled.
Fixes: 2950219d87b0 ("qede: Add basic network device support") Signed-off-by: Manish Chopra manishc@marvell.com Signed-off-by: Alok Prasad palok@marvell.com Reviewed-by: John Meneghini jmeneghi@redhat.com Reviewed-by: Simon Horman horms@kernel.org Link: https://lore.kernel.org/r/20230816150711.59035-1-manishc@marvell.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/qlogic/qede/qede_main.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c index e8d427c7d1cff..dc43e74147fbf 100644 --- a/drivers/net/ethernet/qlogic/qede/qede_main.c +++ b/drivers/net/ethernet/qlogic/qede/qede_main.c @@ -177,6 +177,15 @@ static int qede_sriov_configure(struct pci_dev *pdev, int num_vfs_param) } #endif
+static int __maybe_unused qede_suspend(struct device *dev) +{ + dev_info(dev, "Device does not support suspend operation\n"); + + return -EOPNOTSUPP; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(qede_pm_ops, qede_suspend, NULL); + static const struct pci_error_handlers qede_err_handler = { .error_detected = qede_io_error_detected, }; @@ -191,6 +200,7 @@ static struct pci_driver qede_pci_driver = { .sriov_configure = qede_sriov_configure, #endif .err_handler = &qede_err_handler, + .driver.pm = &qede_pm_ops, };
static struct qed_eth_cb_ops qede_ll_ops = {