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PCI: qcom-ep: Gate Master AXI clock to MHI bus during L1SS 

During L1SS, gate the Master clock supplied to the MHI bus to save power.

Link: https://lore.kernel.org/r/20220914075350.7992-7-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
This commit is contained in:
Manivannan Sadhasivam 2022-09-14 13:23:44 +05:30 committed by Lorenzo Pieralisi
parent 6dbba2b53c
commit c457ac029e
1 changed files with 9 additions and 0 deletions
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9
drivers/pci/controller/dwc/pcie-qcom-ep.c
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@ -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 */