PCI: layerscape: Add workaround for lost link capabilities during reset

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[ Upstream commit 17cf8661ee ]

The endpoint controller loses the Maximum Link Width and Supported Link Speed
value from the Link Capabilities Register - initially configured by the Reset
Configuration Word (RCW) - during a link-down or hot reset event.

Address this issue in the endpoint event handler.

Link: https://lore.kernel.org/r/20230720135834.1977616-2-Frank.Li@nxp.com
Fixes: a805770d8a ("PCI: layerscape: Add EP mode support")
Signed-off-by: Xiaowei Bao <xiaowei.bao@nxp.com>
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Xiaowei Bao 2023-07-20 09:58:34 -04:00 • committed by Greg Kroah-Hartman

parent e30f82597b

commit 507eeaad4d

1 changed files with 19 additions and 0 deletions

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drivers/pci/controller/dwc/pci-layerscape-ep.c

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