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53 lines
1.7 KiB
Diff
53 lines
1.7 KiB
Diff
From 3fe0073d116d9902df08761c1cf0d733dd4c38fc Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
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Date: Wed, 8 Dec 2021 06:03:50 +0100
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Subject: [PATCH] PCI: aardvark: Optimize writing PCI_EXP_RTCTL_PMEIE and
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PCI_EXP_RTSTA_PME on emulated bridge
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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To optimize advk_pci_bridge_emul_pcie_conf_write() code, touch
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PCIE_ISR0_REG and PCIE_ISR0_MASK_REG registers only when it is really
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needed, when processing PCI_EXP_RTCTL_PMEIE and PCI_EXP_RTSTA_PME bits.
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Signed-off-by: Pali Rohár <pali@kernel.org>
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Signed-off-by: Marek Behún <kabel@kernel.org>
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---
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drivers/pci/controller/pci-aardvark.c | 20 +++++++++++---------
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1 file changed, 11 insertions(+), 9 deletions(-)
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--- a/drivers/pci/controller/pci-aardvark.c
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+++ b/drivers/pci/controller/pci-aardvark.c
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@@ -933,19 +933,21 @@ advk_pci_bridge_emul_pcie_conf_write(str
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advk_pcie_wait_for_retrain(pcie);
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break;
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- case PCI_EXP_RTCTL: {
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+ case PCI_EXP_RTCTL:
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/* Only mask/unmask PME interrupt */
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- u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG) &
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- ~PCIE_MSG_PM_PME_MASK;
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- if ((new & PCI_EXP_RTCTL_PMEIE) == 0)
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- val |= PCIE_MSG_PM_PME_MASK;
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- advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
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+ if (mask & PCI_EXP_RTCTL_PMEIE) {
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+ u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
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+ if (new & PCI_EXP_RTCTL_PMEIE)
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+ val &= ~PCIE_MSG_PM_PME_MASK;
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+ else
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+ val |= PCIE_MSG_PM_PME_MASK;
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+ advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
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+ }
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break;
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- }
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case PCI_EXP_RTSTA:
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- new = (new & PCI_EXP_RTSTA_PME) >> 9;
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- advk_writel(pcie, new, PCIE_ISR0_REG);
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+ if (new & PCI_EXP_RTSTA_PME)
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+ advk_writel(pcie, PCIE_MSG_PM_PME_MASK, PCIE_ISR0_REG);
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break;
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case PCI_EXP_DEVCTL:
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