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linux/drivers/pci/pcie
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Ilpo Järvinen 6c88c9d9c6 PCI/ASPM: Use RMW accessors for changing LNKCTL 
[ Upstream commit e09060b3b6 ]

Don't assume that the device is fully under the control of ASPM and use RMW
capability accessors which do proper locking to avoid losing concurrent
updates to the register values.

If configuration fails in pcie_aspm_configure_common_clock(), the
function attempts to restore the old PCI_EXP_LNKCTL_CCC settings. Store
only the old PCI_EXP_LNKCTL_CCC bit for the relevant devices rather
than the content of the whole LNKCTL registers. It aligns better with
how pcie_lnkctl_clear_and_set() expects its parameter and makes the
code more obvious to understand.

Suggested-by: Lukas Wunner <lukas@wunner.de>
Fixes: 2a42d9dba7 ("PCIe: ASPM: Break out of endless loop waiting for PCI config bits to switch")
Fixes: 7d715a6c1a ("PCI: add PCI Express ASPM support")
Link: https://lore.kernel.org/r/20230717120503.15276-5-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-09-13 09:42:46 +02:00
..
aer.c PCI/AER: Iterate over error counters instead of error strings 2022-07-13 14:45:20 -05:00
aer_inject.c PCI/AER: Update aer-inject URL 2022-03-02 11:26:17 -06:00
aspm.c PCI/ASPM: Use RMW accessors for changing LNKCTL 2023-09-13 09:42:46 +02:00
dpc.c PCI/DPC: Await readiness of secondary bus after reset 2023-03-10 09:34:31 +01:00
edr.c PCI/EDR: Clear Device Status after EDR error recovery 2023-05-11 23:03:28 +09:00
err.c PCI/ERR: Recognize disconnected devices in report_error_detected() 2022-06-08 15:08:40 -05:00
Kconfig PCI/AER: Update aer-inject URL 2022-03-02 11:26:17 -06:00
Makefile PCI/ERR: Reduce compile time for CONFIG_PCIEAER=n 2021-10-16 09:16:59 -05:00
pme.c PCI/PME: Use PCI_POSSIBLE_ERROR() to check config reads 2021-11-18 14:13:18 -06:00
portdrv.h PCI/portdrv: Remove unused pcie_port_bus_{,un}register() declarations 2021-10-15 14:25:18 -05:00
portdrv_core.c PCI/portdrv: Don't disable AER reporting in get_port_device_capability() 2022-07-13 14:43:40 -05:00
portdrv_pci.c PCI: portdrv: Set driver_managed_dma 2022-04-28 15:32:20 +02:00
ptm.c PCI/PTM: Reorder functions in logical order 2022-09-12 15:29:52 -05:00
rcec.c PCI/RCEC: Fix RCiEP device to RCEC association 2021-03-10 15:10:46 -06:00