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 <shawn.lin@rock-chips.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Rob Herring <robh@kernel.org>

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";

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");