Commit 0c5f471d authored Jul 06, 2023 by Sai Chaitanya Kaveti

msm: ep_pcie: Set clock power management bit for EP

According to PCIe spec, PCIE_CAP_CLOCK_POWER_MAN bit in
LINK_CAPABILITIES_REG register should be set for EP. But it is seen as
cleared after core reset. In the current driver this bit is being set
but it is not taking effect. Enabling CLK_PM_EN in PCIE_ELBI_SYS_CTRL
register, so that PCIE_CAP_CLOCK_POWER_MAN is set.

Change-Id: I16654d5a477fa8eeaad61d6ec1dd32757627e2f9
Signed-off-by: Sai Chaitanya Kaveti <quic_skaveti@quicinc.com>

parent d5e2d675

drivers/platform/msm/ep_pcie/ep_pcie_core.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -828,6 +828,9 @@ static void ep_pcie_core_init(struct ep_pcie_dev_t *dev, bool configured)
		ep_pcie_write_mask(dev->dm_core + PCIE20_L1SUB_CAPABILITY, 0,
		0x1f);

		/* Set CLK_PM_EN which allows to configure the clock-power-man bit below for EP */
		ep_pcie_write_mask(dev->elbi + PCIE20_ELBI_SYS_CTRL, 1, BIT(7));

		/* Enable Clock Power Management */
		ep_pcie_write_reg_field(dev->dm_core, PCIE20_LINK_CAPABILITIES,
		PCIE20_MASK_CLOCK_POWER_MAN, 0x1);