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charset="utf-8" From: Vidya Sagar LTR message should be sent as soon as the root port enables LTR in the endpoint. Set snoop & no snoop LTR timing and LTR message request before PCIe links up. This ensures that LTR message is sent upstream as soon as LTR is enabled. Fixes: c57247f940e8 ("PCI: tegra: Add support for PCIe endpoint mode in Teg= ra194") 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 | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/contr= oller/dwc/pcie-tegra194.c index 0f669933b108..9883d14f7f97 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -124,6 +124,7 @@ =20 #define APPL_LTR_MSG_1 0xC4 #define LTR_MSG_REQ BIT(15) +#define LTR_MST_NO_SNOOP_SHIFT 16 #define LTR_NOSNOOP_MSG_REQ BIT(31) =20 #define APPL_LTR_MSG_2 0xC8 @@ -488,15 +489,6 @@ static irqreturn_t tegra_pcie_ep_irq_thread(int irq, v= oid *arg) if (val & PCI_COMMAND_MASTER) { ktime_t timeout; =20 - /* 110us for both snoop and no-snoop */ - val =3D FIELD_PREP(PCI_LTR_VALUE_MASK, 110) | - FIELD_PREP(PCI_LTR_SCALE_MASK, 2) | - LTR_MSG_REQ | - FIELD_PREP(PCI_LTR_NOSNOOP_VALUE, 110) | - FIELD_PREP(PCI_LTR_NOSNOOP_SCALE, 2) | - LTR_NOSNOOP_MSG_REQ; - appl_writel(pcie, val, APPL_LTR_MSG_1); - /* Send LTR upstream */ val =3D appl_readl(pcie, APPL_LTR_MSG_2); val |=3D APPL_LTR_MSG_2_LTR_MSG_REQ_STATE; @@ -1799,6 +1791,11 @@ static void pex_ep_event_pex_rst_deassert(struct teg= ra_pcie_dw *pcie) val |=3D APPL_INTR_EN_L1_0_0_RDLH_LINK_UP_INT_EN; appl_writel(pcie, val, APPL_INTR_EN_L1_0_0); =20 + /* 110us for both snoop and no-snoop */ + val =3D 110 | (2 << PCI_LTR_SCALE_SHIFT) | LTR_MSG_REQ; + val |=3D (val << LTR_MST_NO_SNOOP_SHIFT); + appl_writel(pcie, val, APPL_LTR_MSG_1); + reset_control_deassert(pcie->core_rst); =20 /* Perform cleanup that requires refclk and core reset deasserted */ --=20 2.34.1