From 31a3a7b5b26f75fbe82de10ca99f2b673f6c26b4 Mon Sep 17 00:00:00 2001 From: Shawn Lin Date: Thu, 10 Nov 2016 11:14:37 -0600 Subject: [PATCH] PCI: rockchip: Add three new resets as required properties pm_rst, aclk_rst, pclk_rst was controlled by ROM code so the software wasn't needed to control it again in theory. But it didn't work properly, so we do need to do it again and add enough delay between the assert of pm_rst and the deassert of pm_rst. The Soc intergrated with this controller, rk3399, is still under MP test internally, so the backward compatibility won't be a big deal. Signed-off-by: Shawn Lin Signed-off-by: Bjorn Helgaas Reviewed-by: Heiko Stuebner Acked-by: Rob Herring --- .../devicetree/bindings/pci/rockchip-pcie.txt | 11 +++- drivers/pci/host/pcie-rockchip.c | 62 +++++++++++++++++++ 2 files changed, 70 insertions(+), 3 deletions(-) diff --git a/Documentation/devicetree/bindings/pci/rockchip-pcie.txt b/Documentation/devicetree/bindings/pci/rockchip-pcie.txt index ba67b39939c1..71aeda1ca055 100644 --- a/Documentation/devicetree/bindings/pci/rockchip-pcie.txt +++ b/Documentation/devicetree/bindings/pci/rockchip-pcie.txt @@ -26,13 +26,16 @@ Required properties: - "sys" - "legacy" - "client" -- resets: Must contain five entries for each entry in reset-names. +- resets: Must contain seven entries for each entry in reset-names. See ../reset/reset.txt for details. - reset-names: Must include the following names - "core" - "mgmt" - "mgmt-sticky" - "pipe" + - "pm" + - "aclk" + - "pclk" - pinctrl-names : The pin control state names - pinctrl-0: The "default" pinctrl state - #interrupt-cells: specifies the number of cells needed to encode an @@ -86,8 +89,10 @@ pcie0: pcie@f8000000 { reg = <0x0 0xf8000000 0x0 0x2000000>, <0x0 0xfd000000 0x0 0x1000000>; reg-names = "axi-base", "apb-base"; resets = <&cru SRST_PCIE_CORE>, <&cru SRST_PCIE_MGMT>, - <&cru SRST_PCIE_MGMT_STICKY>, <&cru SRST_PCIE_PIPE>; - reset-names = "core", "mgmt", "mgmt-sticky", "pipe"; + <&cru SRST_PCIE_MGMT_STICKY>, <&cru SRST_PCIE_PIPE> , + <&cru SRST_PCIE_PM>, <&cru SRST_P_PCIE>, <&cru SRST_A_PCIE>; + reset-names = "core", "mgmt", "mgmt-sticky", "pipe", + "pm", "pclk", "aclk"; phys = <&pcie_phy>; phy-names = "pcie-phy"; pinctrl-names = "default"; diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c index e0b22dab9b7a..e04f69beb42d 100644 --- a/drivers/pci/host/pcie-rockchip.c +++ b/drivers/pci/host/pcie-rockchip.c @@ -190,6 +190,9 @@ struct rockchip_pcie { struct reset_control *mgmt_rst; struct reset_control *mgmt_sticky_rst; struct reset_control *pipe_rst; + struct reset_control *pm_rst; + struct reset_control *aclk_rst; + struct reset_control *pclk_rst; struct clk *aclk_pcie; struct clk *aclk_perf_pcie; struct clk *hclk_pcie; @@ -408,6 +411,44 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) gpiod_set_value(rockchip->ep_gpio, 0); + err = reset_control_assert(rockchip->aclk_rst); + if (err) { + dev_err(dev, "assert aclk_rst err %d\n", err); + return err; + } + + err = reset_control_assert(rockchip->pclk_rst); + if (err) { + dev_err(dev, "assert pclk_rst err %d\n", err); + return err; + } + + err = reset_control_assert(rockchip->pm_rst); + if (err) { + dev_err(dev, "assert pm_rst err %d\n", err); + return err; + } + + udelay(10); + + err = reset_control_deassert(rockchip->pm_rst); + if (err) { + dev_err(dev, "deassert pm_rst err %d\n", err); + return err; + } + + err = reset_control_deassert(rockchip->aclk_rst); + if (err) { + dev_err(dev, "deassert mgmt_sticky_rst err %d\n", err); + return err; + } + + err = reset_control_deassert(rockchip->pclk_rst); + if (err) { + dev_err(dev, "deassert mgmt_sticky_rst err %d\n", err); + return err; + } + err = phy_init(rockchip->phy); if (err < 0) { dev_err(dev, "fail to init phy, err %d\n", err); @@ -781,6 +822,27 @@ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip) return PTR_ERR(rockchip->pipe_rst); } + rockchip->pm_rst = devm_reset_control_get(dev, "pm"); + if (IS_ERR(rockchip->pm_rst)) { + if (PTR_ERR(rockchip->pm_rst) != -EPROBE_DEFER) + dev_err(dev, "missing pm reset property in node\n"); + return PTR_ERR(rockchip->pm_rst); + } + + rockchip->pclk_rst = devm_reset_control_get(dev, "pclk"); + if (IS_ERR(rockchip->pclk_rst)) { + if (PTR_ERR(rockchip->pclk_rst) != -EPROBE_DEFER) + dev_err(dev, "missing pclk reset property in node\n"); + return PTR_ERR(rockchip->pclk_rst); + } + + rockchip->aclk_rst = devm_reset_control_get(dev, "aclk"); + if (IS_ERR(rockchip->aclk_rst)) { + if (PTR_ERR(rockchip->aclk_rst) != -EPROBE_DEFER) + dev_err(dev, "missing aclk reset property in node\n"); + return PTR_ERR(rockchip->aclk_rst); + } + rockchip->ep_gpio = devm_gpiod_get(dev, "ep", GPIOD_OUT_HIGH); if (IS_ERR(rockchip->ep_gpio)) { dev_err(dev, "missing ep-gpios property in node\n"); -- 2.30.2