Re: [PATCH v2] PCI: qcom: Allow L1 and its sub states

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A gentle remainder.

On 6/15/2022 6:45 PM, Krishna chaitanya chundru wrote:
Allow L1 and its sub-states in the qcom pcie driver.
By default this is disabled in the hardware. So enabling it explicitly.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@xxxxxxxxxxx>
---
  drivers/pci/controller/dwc/pcie-qcom.c | 8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 6ab9089..0d8efcc 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -41,6 +41,9 @@
  #define L23_CLK_RMV_DIS				BIT(2)
  #define L1_CLK_RMV_DIS				BIT(1)
+#define PCIE20_PARF_PM_CTRL 0x20
+#define REQ_NOT_ENTR_L1				BIT(5)
+
  #define PCIE20_PARF_PHY_CTRL			0x40
  #define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK	GENMASK(20, 16)
  #define PHY_CTRL_PHY_TX0_TERM_OFFSET(x)		((x) << 16)
@@ -1267,6 +1270,11 @@ static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
  	val |= BIT(4);
  	writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL);
+ /* Enable L1 and L1ss */
+	val = readl(pcie->parf + PCIE20_PARF_PM_CTRL);
+	val &= ~REQ_NOT_ENTR_L1;
+	writel(val, pcie->parf + PCIE20_PARF_PM_CTRL);
+
  	if (IS_ENABLED(CONFIG_PCI_MSI)) {
  		val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
  		val |= BIT(31);



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