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igc: Fix suspending when PTM is active

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Some mainboard/CPU combinations, in particular, Alder Lake-S with a
W680 mainboard, have shown problems (system hangs usually, no kernel
logs) with suspend/resume when PCIe PTM is enabled and active. In some
cases, it could be reproduced when removing the igc module.

The best we can do is to stop PTM dialogs from the downstream/device
side before the interface is brought down. PCIe PTM will be re-enabled
when the interface is being brought up.

Fixes: a90ec84837 ("igc: Add support for PTP getcrosststamp()")
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Acked-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Vinicius Costa Gomes 2022-04-12 18:58:15 -07:00 committed by Tony Nguyen
parent c80a29f0fe
commit 822f52e7ef
1 changed files with 14 additions and 1 deletions
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15
drivers/net/ethernet/intel/igc/igc_ptp.c
View file

@ -992,6 +992,17 @@ static void igc_ptp_time_restore(struct igc_adapter *adapter)
igc_ptp_write_i225(adapter, &ts);
}
static void igc_ptm_stop(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
u32 ctrl;
ctrl = rd32(IGC_PTM_CTRL);
ctrl &= ~IGC_PTM_CTRL_EN;
wr32(IGC_PTM_CTRL, ctrl);
}
/**
* igc_ptp_suspend - Disable PTP work items and prepare for suspend
* @adapter: Board private structure
@ -1009,8 +1020,10 @@ void igc_ptp_suspend(struct igc_adapter *adapter)
adapter->ptp_tx_skb = NULL;
clear_bit_unlock(__IGC_PTP_TX_IN_PROGRESS, &adapter->state);
if (pci_device_is_present(adapter->pdev))
if (pci_device_is_present(adapter->pdev)) {
igc_ptp_time_save(adapter);
igc_ptm_stop(adapter);
}
}
/**