Commit fd785c64 authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

Merge branch 'remotes/lorenzo/pci/mediatek' 

- Assert PERST# for 100ms to allow power and clock to stabilize (qizhong
  cheng)

* remotes/lorenzo/pci/mediatek:
  PCI: mediatek: Assert PERST# for 100ms for power and clock to stabilize
parents 0dfa6f6e 65ace9a8

drivers/pci/controller/pcie-mediatek.c

+7 −0
Original line number Diff line number Diff line
@@ -702,6 +702,13 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port) 
	 */

	writel(PCIE_LINKDOWN_RST_EN, port->base + PCIE_RST_CTRL);



	/*

	 * Described in PCIe CEM specification sections 2.2 (PERST# Signal) and

	 * 2.2.1 (Initial Power-Up (G3 to S0)). The deassertion of PERST# should

	 * be delayed 100ms (TPVPERL) for the power and clock to become stable.

	 */

	msleep(100);



	/* De-assert PHY, PE, PIPE, MAC and configuration reset	*/

	val = readl(port->base + PCIE_RST_CTRL);

	val |= PCIE_PHY_RSTB | PCIE_PERSTB | PCIE_PIPE_SRSTB |