target/linux/generic/pending-5.10/850-0015-PCI-aardvark-Optimize-writing-PCI_EXP_RTCTL_PMEIE-an.patch

   1 From 3fe0073d116d9902df08761c1cf0d733dd4c38fc Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
   3 Date: Wed, 8 Dec 2021 06:03:50 +0100
   4 Subject: [PATCH] PCI: aardvark: Optimize writing PCI_EXP_RTCTL_PMEIE and
   5  PCI_EXP_RTSTA_PME on emulated bridge
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 To optimize advk_pci_bridge_emul_pcie_conf_write() code, touch
  11 PCIE_ISR0_REG and PCIE_ISR0_MASK_REG registers only when it is really
  12 needed, when processing PCI_EXP_RTCTL_PMEIE and PCI_EXP_RTSTA_PME bits.
  13
  14 Signed-off-by: Pali Rohár <pali@kernel.org>
  15 Signed-off-by: Marek Behún <kabel@kernel.org>
  16 ---
  17  drivers/pci/controller/pci-aardvark.c | 20 +++++++++++---------
  18  1 file changed, 11 insertions(+), 9 deletions(-)
  19
  20 --- a/drivers/pci/controller/pci-aardvark.c
  21 +++ b/drivers/pci/controller/pci-aardvark.c
  22 @@ -932,19 +932,21 @@ advk_pci_bridge_emul_pcie_conf_write(str
  23                         advk_pcie_wait_for_retrain(pcie);
  24                 break;
  25
  26 -       case PCI_EXP_RTCTL: {
  27 +       case PCI_EXP_RTCTL:
  28                 /* Only mask/unmask PME interrupt */
  29 -               u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG) &
  30 -                       ~PCIE_MSG_PM_PME_MASK;
  31 -               if ((new & PCI_EXP_RTCTL_PMEIE) == 0)
  32 -                       val |= PCIE_MSG_PM_PME_MASK;
  33 -               advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
  34 +               if (mask & PCI_EXP_RTCTL_PMEIE) {
  35 +                       u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
  36 +                       if (new & PCI_EXP_RTCTL_PMEIE)
  37 +                               val &= ~PCIE_MSG_PM_PME_MASK;
  38 +                       else
  39 +                               val |= PCIE_MSG_PM_PME_MASK;
  40 +                       advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
  41 +               }
  42                 break;
  43 -       }
  44
  45         case PCI_EXP_RTSTA:
  46 -               new = (new & PCI_EXP_RTSTA_PME) >> 9;
  47 -               advk_writel(pcie, new, PCIE_ISR0_REG);
  48 +               if (new & PCI_EXP_RTSTA_PME)
  49 +                       advk_writel(pcie, PCIE_MSG_PM_PME_MASK, PCIE_ISR0_REG);
  50                 break;
  51
  52         case PCI_EXP_DEVCTL: