Ilpo Järvinen a922770cd4 PCI/ASPM: Avoid link retraining race ... [ Upstream commit e7e3975636 ] PCIe r6.0.1, sec 7.5.3.7, recommends setting the link control parameters, then waiting for the Link Training bit to be clear before setting the Retrain Link bit. This avoids a race where the LTSSM may not use the updated parameters if it is already in the midst of link training because of other normal link activity. Wait for the Link Training bit to be clear before toggling the Retrain Link bit to ensure that the LTSSM uses the updated link control parameters. [bhelgaas: commit log, return 0 (success)/-ETIMEDOUT instead of bool for both pcie_wait_for_retrain() and the existing pcie_retrain_link()] Suggested-by: Lukas Wunner <lukas@wunner.de> Fixes: 7d715a6c1a ("PCI: add PCI Express ASPM support") Link: https://lore.kernel.org/r/20230502083923.34562-1-ilpo.jarvinen@linux.intel.com 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> Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-08-11 11:45:29 +02:00
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aer.c
aer_inject.c
aspm.c	PCI/ASPM: Avoid link retraining race	2023-08-11 11:45:29 +02:00
dpc.c
err.c
Kconfig
Makefile
pme.c
portdrv.h
portdrv_core.c
portdrv_pci.c
ptm.c	PCI/PTM: Inherit Switch Downstream Port PTM settings from Upstream Port	2020-06-25 15:32:58 +02:00