[PATCH v3 07/12] PCI: qcom-ep: Disable Master AXI Clock when there is no PCIe traffic

Manivannan Sadhasivam
2022-09-10T06:32:22Z

The Master AXI clock can be disabled when it is not used i.e., when there
is no traffic on the PCIe bus. This helps to save power during idle state.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
drivers/pci/controller/dwc/pcie-qcom-ep.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 526e98ea23f6..40f75a6c55df 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -105,6 +105,7 @@
/* PARF_SYS_CTRL register fields */
#define PARF_SYS_CTRL_AUX_PWR_DET BIT(4)
#define PARF_SYS_CTRL_CORE_CLK_CGC_DIS BIT(6)
+#define PARF_SYS_CTRL_MSTR_ACLK_CGC_DIS BIT(10)
#define PARF_SYS_CTRL_SLV_DBI_WAKE_DISABLE BIT(11)

/* PARF_DB_CTRL register fields */
@@ -341,8 +342,14 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
val &= ~PARF_Q2A_FLUSH_EN;
writel_relaxed(val, pcie_ep->parf + PARF_Q2A_FLUSH);

- /* Disable DBI Wakeup, core clock CGC and enable AUX power */
+ /*
+ * Disable Master AXI clock during idle
+ * Do not allow DBI access to take the core out of L1
+ * Disable core clock gating that gates PIPE clock from propagating to core clock
+ * Report to the host that Vaux is present
+ */
val = readl_relaxed(pcie_ep->parf + PARF_SYS_CTRL);
+ val &= ~PARF_SYS_CTRL_MSTR_ACLK_CGC_DIS;
val |= PARF_SYS_CTRL_SLV_DBI_WAKE_DISABLE |
PARF_SYS_CTRL_CORE_CLK_CGC_DIS |
PARF_SYS_CTRL_AUX_PWR_DET;
--
2.25.1