During L1SS, gate the Master clock supplied to the MHI bus to save power. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> --- drivers/pci/controller/dwc/pcie-qcom-ep.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index 2dc6d4e44aff..526e98ea23f6 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -27,6 +27,7 @@ #define PARF_SYS_CTRL 0x00 #define PARF_DB_CTRL 0x10 #define PARF_PM_CTRL 0x20 +#define PARF_MHI_CLOCK_RESET_CTRL 0x174 #define PARF_MHI_BASE_ADDR_LOWER 0x178 #define PARF_MHI_BASE_ADDR_UPPER 0x17c #define PARF_DEBUG_INT_EN 0x190 @@ -89,6 +90,9 @@ #define PARF_PM_CTRL_READY_ENTR_L23 BIT(2) #define PARF_PM_CTRL_REQ_NOT_ENTR_L1 BIT(5) +/* PARF_MHI_CLOCK_RESET_CTRL fields */ +#define PARF_MSTR_AXI_CLK_EN BIT(1) + /* PARF_AXI_MSTR_RD_HALT_NO_WRITES register fields */ #define PARF_AXI_MSTR_RD_HALT_NO_WRITE_EN BIT(0) @@ -394,6 +398,11 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci) pcie_ep->parf + PARF_MHI_BASE_ADDR_LOWER); writel_relaxed(0, pcie_ep->parf + PARF_MHI_BASE_ADDR_UPPER); + /* Gate Master AXI clock to MHI bus during L1SS */ + val = readl_relaxed(pcie_ep->parf + PARF_MHI_CLOCK_RESET_CTRL); + val &= ~PARF_MSTR_AXI_CLK_EN; + val = readl_relaxed(pcie_ep->parf + PARF_MHI_CLOCK_RESET_CTRL); + dw_pcie_ep_init_notify(&pcie_ep->pci.ep); /* Enable LTSSM */ -- 2.25.1
