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Code Issues Releases Wiki Activity

PCI: aardvark: Fix reading PCI_EXP_RTSTA_PME bit on emulated bridge

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The emulated bridge returns incorrect value for PCI_EXP_RTSTA register
during readout in advk_pci_bridge_emul_pcie_conf_read() function: the
correct bit is BIT(16), but we are setting BIT(23), because the code
does
  *value = (isr0 & PCIE_MSG_PM_PME_MASK) << 16
where
  PCIE_MSG_PM_PME_MASK
is
  BIT(7).

The code should probably have been something like
  *value = (!!(isr0 & PCIE_MSG_PM_PME_MASK)) << 16,
but we are better of using an if() and using the proper macro for this
bit.

Link: https://lore.kernel.org/r/20220110015018.26359-15-kabel@kernel.org
Fixes: 8a3ebd8de3 ("PCI: aardvark: Implement emulated root PCI bridge config space")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Pali Rohár 2022-01-10 02:50:09 +01:00 committed by Lorenzo Pieralisi
parent 3ebfefa396
commit 735f5ae49e
1 changed files with 3 additions and 1 deletions
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4
drivers/pci/controller/pci-aardvark.c
View file

@ -867,7 +867,9 @@ advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
case PCI_EXP_RTSTA: {
u32 isr0 = advk_readl(pcie, PCIE_ISR0_REG);
u32 msglog = advk_readl(pcie, PCIE_MSG_LOG_REG);
*value = (isr0 & PCIE_MSG_PM_PME_MASK) << 16 | (msglog >> 16);
*value = msglog >> 16;
if (isr0 & PCIE_MSG_PM_PME_MASK)
*value |= PCI_EXP_RTSTA_PME;
return PCI_BRIDGE_EMUL_HANDLED;
}