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charset="utf-8" From: Vidya Sagar As per PCIe spec r6.0, sec 5.3.3.2.1, after sending PME_Turn_Off message, Root port should wait for 1~10 msec for PME_TO_Ack message. Currently, driver is polling for 10 msec with 1 usec delay which is aggressive. Change it to 10 msec polling with 100 usec delay. Since this function is used in non-atomic context only, use non-atomic poll function. Fixes: 56e15a238d92 ("PCI: tegra: Add Tegra194 PCIe support") Signed-off-by: Vidya Sagar Signed-off-by: Manikanta Maddireddy --- V5: * None V4: * None V3: * None V2: * None drivers/pci/controller/dwc/pcie-tegra194.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/contr= oller/dwc/pcie-tegra194.c index 0ddeef70726d..96d38571a7e7 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -198,7 +198,8 @@ #define CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_MASK GENMASK(11, 8) #define CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_SHIFT 8 =20 -#define PME_ACK_TIMEOUT 10000 +#define PME_ACK_DELAY 100 /* 100 us */ +#define PME_ACK_TIMEOUT 10000 /* 10 ms */ =20 #define LTSSM_TIMEOUT 50000 /* 50ms */ =20 @@ -1553,9 +1554,9 @@ static int tegra_pcie_try_link_l2(struct tegra_pcie_d= w *pcie) val |=3D APPL_PM_XMT_TURNOFF_STATE; appl_writel(pcie, val, APPL_RADM_STATUS); =20 - return readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG, val, - val & APPL_DEBUG_PM_LINKST_IN_L2_LAT, - 1, PME_ACK_TIMEOUT); + return readl_poll_timeout(pcie->appl_base + APPL_DEBUG, val, + val & APPL_DEBUG_PM_LINKST_IN_L2_LAT, + PME_ACK_DELAY, PME_ACK_TIMEOUT); } =20 static void tegra_pcie_dw_pme_turnoff(struct tegra_pcie_dw *pcie) --=20 2.34.1