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msm: pcie: Disable access to PARF register when link is disabled

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Disable access to PCIE PARF registers when link is disabled.

Change-Id: I2496edbfecb5f67571138fea1b4edfa5df3f030b
Signed-off-by: Vivek Pernamitta <vpernami@codeaurora.org>
This commit is contained in:
Vivek Pernamitta 2020-11-05 16:37:56 +05:30
commit e9dfb77350
1 changed files with 25 additions and 7 deletions
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32
drivers/pci/controller/pci-msm.c
View file

@ -5824,7 +5824,16 @@ void msm_pcie_allow_l1(struct pci_dev *pci_dev)
pcie_dev = PCIE_BUS_PRIV_DATA(root_pci_dev->bus);
mutex_lock(&pcie_dev->aspm_lock);
mutex_lock(&pcie_dev->setup_lock);
if (pcie_dev->link_status != MSM_PCIE_LINK_ENABLED) {
PCIE_DBG(pcie_dev,
"RC%d: PCIE Link is already disabled\n",
pcie_dev->rc_idx);
mutex_unlock(&pcie_dev->setup_lock);
return;
}
if (unlikely(--pcie_dev->prevent_l1 < 0))
PCIE_ERR(pcie_dev,
"PCIe: RC%d: %02x:%02x.%01x: unbalanced prevent_l1: %d < 0\n",
@ -5833,7 +5842,7 @@ void msm_pcie_allow_l1(struct pci_dev *pci_dev)
pcie_dev->prevent_l1);
if (pcie_dev->prevent_l1) {
mutex_unlock(&pcie_dev->aspm_lock);
mutex_unlock(&pcie_dev->setup_lock);
return;
}
@ -5846,7 +5855,7 @@ void msm_pcie_allow_l1(struct pci_dev *pci_dev)
PCIE_DBG2(pcie_dev, "PCIe: RC%d: %02x:%02x.%01x: exit\n",
pcie_dev->rc_idx, pci_dev->bus->number,
PCI_SLOT(pci_dev->devfn), PCI_FUNC(pci_dev->devfn));
mutex_unlock(&pcie_dev->aspm_lock);
mutex_unlock(&pcie_dev->setup_lock);
}
EXPORT_SYMBOL(msm_pcie_allow_l1);
@ -5865,9 +5874,18 @@ int msm_pcie_prevent_l1(struct pci_dev *pci_dev)
pcie_dev = PCIE_BUS_PRIV_DATA(root_pci_dev->bus);
/* disable L1 */
mutex_lock(&pcie_dev->aspm_lock);
mutex_lock(&pcie_dev->setup_lock);
if (pcie_dev->link_status != MSM_PCIE_LINK_ENABLED) {
PCIE_DBG(pcie_dev,
"RC%d: PCIE Link is already disabled\n",
pcie_dev->rc_idx);
mutex_unlock(&pcie_dev->setup_lock);
return -EIO;
}
if (pcie_dev->prevent_l1++) {
mutex_unlock(&pcie_dev->aspm_lock);
mutex_unlock(&pcie_dev->setup_lock);
return 0;
}
@ -5895,11 +5913,11 @@ int msm_pcie_prevent_l1(struct pci_dev *pci_dev)
PCIE_DBG2(pcie_dev, "PCIe: RC%d: %02x:%02x.%01x: exit\n",
pcie_dev->rc_idx, pci_dev->bus->number,
PCI_SLOT(pci_dev->devfn), PCI_FUNC(pci_dev->devfn));
mutex_unlock(&pcie_dev->aspm_lock);
mutex_unlock(&pcie_dev->setup_lock);
return 0;
err:
mutex_unlock(&pcie_dev->aspm_lock);
mutex_unlock(&pcie_dev->setup_lock);
msm_pcie_allow_l1(pci_dev);
return ret;