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PCI: mvebu: Update comment for PCI_EXP_LNKCAP register on emulated bridge

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Reason for clearing this bit is because mvebu hw returns incorrectly this bit set to 1.

Link: https://lore.kernel.org/r/20220104153529.31647-10-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Pali Rohár 2022-01-04 16:35:27 +01:00 committed by Lorenzo Pieralisi
parent 16038ebb0f
commit d76a6ed096
1 changed files with 2 additions and 2 deletions
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4
drivers/pci/controller/pci-mvebu.c
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@ -546,8 +546,8 @@ mvebu_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
case PCI_EXP_LNKCAP:
/*
* PCIe requires the clock power management capability to be
* hard-wired to zero for downstream ports
* PCIe requires that the Clock Power Management capability bit
* is hard-wired to zero for downstream ports but HW returns 1.
*/
*value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP) &
~PCI_EXP_LNKCAP_CLKPM;