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PCI: aardvark: Optimize writing PCI_EXP_RTCTL_PMEIE and PCI_EXP_RTSTA_PME on emulated bridge

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To optimize advk_pci_bridge_emul_pcie_conf_write() code, touch
PCIE_ISR0_REG and PCIE_ISR0_MASK_REG registers only when it is really
needed, when processing PCI_EXP_RTCTL_PMEIE and PCI_EXP_RTSTA_PME bits.

Link: https://lore.kernel.org/r/20220110015018.26359-16-kabel@kernel.org
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 02:50:10 +01:00 committed by Lorenzo Pieralisi
parent 735f5ae49e
commit 7122bcb332
1 changed files with 11 additions and 9 deletions
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20
drivers/pci/controller/pci-aardvark.c
View file

@ -925,19 +925,21 @@ advk_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,
advk_pcie_wait_for_retrain(pcie);
break;
case PCI_EXP_RTCTL: {
case PCI_EXP_RTCTL:
/* Only mask/unmask PME interrupt */
u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG) &
~PCIE_MSG_PM_PME_MASK;
if ((new & PCI_EXP_RTCTL_PMEIE) == 0)
val |= PCIE_MSG_PM_PME_MASK;
advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
if (mask & PCI_EXP_RTCTL_PMEIE) {
u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
if (new & PCI_EXP_RTCTL_PMEIE)
val &= ~PCIE_MSG_PM_PME_MASK;
else
val |= PCIE_MSG_PM_PME_MASK;
advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
}
break;
}
case PCI_EXP_RTSTA:
new = (new & PCI_EXP_RTSTA_PME) >> 9;
advk_writel(pcie, new, PCIE_ISR0_REG);
if (new & PCI_EXP_RTSTA_PME)
advk_writel(pcie, PCIE_MSG_PM_PME_MASK, PCIE_ISR0_REG);
break;
case PCI_EXP_DEVCTL: