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msm: pcie: remove read to PCIe ELBI_SYS_CTRL reg after PME_TURNOFF

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After sending PME_TURNOFF message via ELBI_SYS_CTRL register,
remove read back to the register to avoid possible hang.

Change-Id: Ie424006991f10f12127f9b5a07a93c291c7a2f10
Signed-off-by: Tony Truong <truong@codeaurora.org>
This commit is contained in:
Tony Truong 2020-03-27 11:27:22 -07:00 • committed by Gerrit - the friendly Code Review server
commit bccdbc1d48
1 changed files with 2 additions and 2 deletions
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4
drivers/pci/controller/pci-msm.c
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@ -6643,8 +6643,8 @@ static int msm_pcie_pm_suspend(struct pci_dev *dev,
spin_unlock_irqrestore(&pcie_dev->cfg_lock,
pcie_dev->irqsave_flags);
msm_pcie_write_mask(pcie_dev->elbi + PCIE20_ELBI_SYS_CTRL, 0,
BIT(4));
writel_relaxed(BIT(4), pcie_dev->elbi + PCIE20_ELBI_SYS_CTRL);
wmb(); /* ensure changes propagated to the hardware */
PCIE_DBG(pcie_dev, "RC%d: PME_TURNOFF_MSG is sent out\n",
pcie_dev->rc_idx);