diff mbox series

[v11,06/11] PCI: brcmstb: Add control of rescal reset

Message ID 20200824193036.6033-7-james.quinlan@broadcom.com (mailing list archive)
State New, archived
Headers show
Series PCI: brcmstb: enable PCIe for STB chips | expand

Commit Message

Jim Quinlan Aug. 24, 2020, 7:30 p.m. UTC 
From: Jim Quinlan <jquinlan@broadcom.com>

Some STB chips have a special purpose reset controller named RESCAL (reset
calibration).  The PCIe HW can now control RESCAL to start and stop its
operation.  On probe(), the RESCAL is deasserted and the driver goes
through the sequence of setting registers and reading status in order to
start the internal PHY that is required for the PCIe.

Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/pci/controller/pcie-brcmstb.c | 82 ++++++++++++++++++++++++++-
 1 file changed, 81 insertions(+), 1 deletion(-)

Comments

Lorenzo Pieralisi Sept. 8, 2020, 1:32 p.m. UTC | #1 
On Mon, Aug 24, 2020 at 03:30:19PM -0400, Jim Quinlan wrote:
> From: Jim Quinlan <jquinlan@broadcom.com>
> 
> Some STB chips have a special purpose reset controller named RESCAL (reset
> calibration).  The PCIe HW can now control RESCAL to start and stop its
> operation.  On probe(), the RESCAL is deasserted and the driver goes
> through the sequence of setting registers and reading status in order to
> start the internal PHY that is required for the PCIe.
> 
> Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
> Acked-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
>  drivers/pci/controller/pcie-brcmstb.c | 82 ++++++++++++++++++++++++++-
>  1 file changed, 81 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index acf2239b0251..041b8d109563 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -23,6 +23,7 @@
>  #include <linux/of_platform.h>
>  #include <linux/pci.h>
>  #include <linux/printk.h>
> +#include <linux/reset.h>
>  #include <linux/sizes.h>
>  #include <linux/slab.h>
>  #include <linux/string.h>
> @@ -158,6 +159,16 @@
>  #define DATA_ADDR(pcie)			(pcie->reg_offsets[EXT_CFG_DATA])
>  #define PCIE_RGR1_SW_INIT_1(pcie)	(pcie->reg_offsets[RGR1_SW_INIT_1])
>  
> +/* Rescal registers */
> +#define PCIE_DVT_PMU_PCIE_PHY_CTRL				0xc700
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS			0x3
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_MASK		0x4
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_SHIFT	0x2
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_MASK		0x2
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_SHIFT		0x1
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_MASK		0x1
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_SHIFT		0x0
> +
>  enum {
>  	RGR1_SW_INIT_1,
>  	EXT_CFG_INDEX,
> @@ -247,6 +258,7 @@ struct brcm_pcie {
>  	const int		*reg_offsets;
>  	const int		*reg_field_info;
>  	enum pcie_type		type;
> +	struct reset_control	*rescal;
>  };
>  
>  /*
> @@ -965,6 +977,47 @@ static void brcm_pcie_enter_l23(struct brcm_pcie *pcie)
>  		dev_err(pcie->dev, "failed to enter low-power link state\n");
>  }
>  
> +static int brcm_phy_cntl(struct brcm_pcie *pcie, const int start)
> +{
> +	static const u32 shifts[PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS] = {
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_SHIFT,
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_SHIFT,
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_SHIFT,};
> +	static const u32 masks[PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS] = {
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_MASK,
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_MASK,
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_MASK,};
> +	const int beg = start ? 0 : PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS - 1;
> +	const int end = start ? PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS : -1;
> +	u32 tmp, combined_mask = 0;
> +	u32 val = !!start;

Quick note: I think it would be nicer to init val within the loop
below (IIUC how this works):

val = start ? BIT_MASK(shifts[i]) : 0;

and then use it in the tmp computation but I leave it up to you.

Lorenzo

> +	void __iomem *base = pcie->base;
> +	int i;
> +
> +	for (i = beg; i != end; start ? i++ : i--) {
> +		tmp = readl(base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
> +		tmp = (tmp & ~masks[i]) | ((val << shifts[i]) & masks[i]);
> +		writel(tmp, base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
> +		usleep_range(50, 200);
> +		combined_mask |= masks[i];
> +	}
> +
> +	tmp = readl(base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
> +	val = start ? combined_mask : 0;
> +
> +	return (tmp & combined_mask) == val ? 0 : -EIO;
> +}
> +
> +static inline int brcm_phy_start(struct brcm_pcie *pcie)
> +{
> +	return pcie->rescal ? brcm_phy_cntl(pcie, 1) : 0;
> +}
> +
> +static inline int brcm_phy_stop(struct brcm_pcie *pcie)
> +{
> +	return pcie->rescal ? brcm_phy_cntl(pcie, 0) : 0;
> +}
> +
>  static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
>  {
>  	void __iomem *base = pcie->base;
> @@ -992,11 +1045,15 @@ static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
>  static int brcm_pcie_suspend(struct device *dev)
>  {
>  	struct brcm_pcie *pcie = dev_get_drvdata(dev);
> +	int ret;
>  
>  	brcm_pcie_turn_off(pcie);
> +	ret = brcm_phy_stop(pcie);
> +	if (ret)
> +		dev_err(pcie->dev, "failed to stop phy\n");
>  	clk_disable_unprepare(pcie->clk);
>  
> -	return 0;
> +	return ret;
>  }
>  
>  static int brcm_pcie_resume(struct device *dev)
> @@ -1009,6 +1066,12 @@ static int brcm_pcie_resume(struct device *dev)
>  	base = pcie->base;
>  	clk_prepare_enable(pcie->clk);
>  
> +	ret = brcm_phy_start(pcie);
> +	if (ret) {
> +		dev_err(pcie->dev, "failed to start phy\n");
> +		return ret;
> +	}
> +
>  	/* Take bridge out of reset so we can access the SERDES reg */
>  	brcm_pcie_bridge_sw_init_set(pcie, 0);
>  
> @@ -1034,6 +1097,9 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
>  {
>  	brcm_msi_remove(pcie);
>  	brcm_pcie_turn_off(pcie);
> +	if (brcm_phy_stop(pcie))
> +		dev_err(pcie->dev, "failed to stop phy\n");
> +	reset_control_assert(pcie->rescal);
>  	clk_disable_unprepare(pcie->clk);
>  }
>  
> @@ -1112,6 +1178,20 @@ static int brcm_pcie_probe(struct platform_device *pdev)
>  		dev_err(&pdev->dev, "could not enable clock\n");
>  		return ret;
>  	}
> +	pcie->rescal = devm_reset_control_get_optional_shared(&pdev->dev, "rescal");
> +	if (IS_ERR(pcie->rescal))
> +		return PTR_ERR(pcie->rescal);
> +
> +	ret = reset_control_deassert(pcie->rescal);
> +	if (ret)
> +		dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
> +
> +	ret = brcm_phy_start(pcie);
> +	if (ret) {
> +		dev_err(pcie->dev, "failed to start phy\n");
> +		reset_control_assert(pcie->rescal);
> +		return ret;
> +	}
>  
>  	ret = brcm_pcie_setup(pcie);
>  	if (ret)
> -- 
> 2.17.1
>
Rob Herring (Arm) Sept. 10, 2020, 4:09 p.m. UTC | #2 
On Mon, Aug 24, 2020 at 03:30:19PM -0400, Jim Quinlan wrote:
> From: Jim Quinlan <jquinlan@broadcom.com>
> 
> Some STB chips have a special purpose reset controller named RESCAL (reset
> calibration).  The PCIe HW can now control RESCAL to start and stop its
> operation.  On probe(), the RESCAL is deasserted and the driver goes
> through the sequence of setting registers and reading status in order to
> start the internal PHY that is required for the PCIe.
> 
> Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
> Acked-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
>  drivers/pci/controller/pcie-brcmstb.c | 82 ++++++++++++++++++++++++++-
>  1 file changed, 81 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index acf2239b0251..041b8d109563 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -23,6 +23,7 @@
>  #include <linux/of_platform.h>
>  #include <linux/pci.h>
>  #include <linux/printk.h>
> +#include <linux/reset.h>
>  #include <linux/sizes.h>
>  #include <linux/slab.h>
>  #include <linux/string.h>
> @@ -158,6 +159,16 @@
>  #define DATA_ADDR(pcie)			(pcie->reg_offsets[EXT_CFG_DATA])
>  #define PCIE_RGR1_SW_INIT_1(pcie)	(pcie->reg_offsets[RGR1_SW_INIT_1])
>  
> +/* Rescal registers */
> +#define PCIE_DVT_PMU_PCIE_PHY_CTRL				0xc700
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS			0x3
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_MASK		0x4
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_SHIFT	0x2
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_MASK		0x2
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_SHIFT		0x1
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_MASK		0x1
> +#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_SHIFT		0x0
> +
>  enum {
>  	RGR1_SW_INIT_1,
>  	EXT_CFG_INDEX,
> @@ -247,6 +258,7 @@ struct brcm_pcie {
>  	const int		*reg_offsets;
>  	const int		*reg_field_info;
>  	enum pcie_type		type;
> +	struct reset_control	*rescal;
>  };
>  
>  /*
> @@ -965,6 +977,47 @@ static void brcm_pcie_enter_l23(struct brcm_pcie *pcie)
>  		dev_err(pcie->dev, "failed to enter low-power link state\n");
>  }
>  
> +static int brcm_phy_cntl(struct brcm_pcie *pcie, const int start)
> +{
> +	static const u32 shifts[PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS] = {
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_SHIFT,
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_SHIFT,
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_SHIFT,};
> +	static const u32 masks[PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS] = {
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_MASK,
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_MASK,
> +		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_MASK,};
> +	const int beg = start ? 0 : PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS - 1;
> +	const int end = start ? PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS : -1;
> +	u32 tmp, combined_mask = 0;
> +	u32 val = !!start;
> +	void __iomem *base = pcie->base;
> +	int i;
> +
> +	for (i = beg; i != end; start ? i++ : i--) {
> +		tmp = readl(base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
> +		tmp = (tmp & ~masks[i]) | ((val << shifts[i]) & masks[i]);
> +		writel(tmp, base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
> +		usleep_range(50, 200);
> +		combined_mask |= masks[i];
> +	}
> +
> +	tmp = readl(base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
> +	val = start ? combined_mask : 0;
> +
> +	return (tmp & combined_mask) == val ? 0 : -EIO;
> +}
> +
> +static inline int brcm_phy_start(struct brcm_pcie *pcie)
> +{
> +	return pcie->rescal ? brcm_phy_cntl(pcie, 1) : 0;
> +}
> +
> +static inline int brcm_phy_stop(struct brcm_pcie *pcie)
> +{
> +	return pcie->rescal ? brcm_phy_cntl(pcie, 0) : 0;
> +}
> +
>  static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
>  {
>  	void __iomem *base = pcie->base;
> @@ -992,11 +1045,15 @@ static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
>  static int brcm_pcie_suspend(struct device *dev)
>  {
>  	struct brcm_pcie *pcie = dev_get_drvdata(dev);
> +	int ret;
>  
>  	brcm_pcie_turn_off(pcie);
> +	ret = brcm_phy_stop(pcie);
> +	if (ret)
> +		dev_err(pcie->dev, "failed to stop phy\n");
>  	clk_disable_unprepare(pcie->clk);
>  
> -	return 0;
> +	return ret;
>  }
>  
>  static int brcm_pcie_resume(struct device *dev)
> @@ -1009,6 +1066,12 @@ static int brcm_pcie_resume(struct device *dev)
>  	base = pcie->base;
>  	clk_prepare_enable(pcie->clk);
>  
> +	ret = brcm_phy_start(pcie);
> +	if (ret) {
> +		dev_err(pcie->dev, "failed to start phy\n");
> +		return ret;
> +	}
> +
>  	/* Take bridge out of reset so we can access the SERDES reg */
>  	brcm_pcie_bridge_sw_init_set(pcie, 0);
>  
> @@ -1034,6 +1097,9 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
>  {
>  	brcm_msi_remove(pcie);
>  	brcm_pcie_turn_off(pcie);
> +	if (brcm_phy_stop(pcie))
> +		dev_err(pcie->dev, "failed to stop phy\n");
> +	reset_control_assert(pcie->rescal);
>  	clk_disable_unprepare(pcie->clk);
>  }
>  
> @@ -1112,6 +1178,20 @@ static int brcm_pcie_probe(struct platform_device *pdev)
>  		dev_err(&pdev->dev, "could not enable clock\n");
>  		return ret;
>  	}
> +	pcie->rescal = devm_reset_control_get_optional_shared(&pdev->dev, "rescal");
> +	if (IS_ERR(pcie->rescal))
> +		return PTR_ERR(pcie->rescal);
> +
> +	ret = reset_control_deassert(pcie->rescal);
> +	if (ret)
> +		dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
> +
> +	ret = brcm_phy_start(pcie);
> +	if (ret) {
> +		dev_err(pcie->dev, "failed to start phy\n");

4 calls to brcm_phy_cntl() and 4 error prints. Move the error print to 
brcm_phy_cntl.

> +		reset_control_assert(pcie->rescal);
> +		return ret;
> +	}
>  
>  	ret = brcm_pcie_setup(pcie);
>  	if (ret)
> -- 
> 2.17.1
>
diff mbox series

Patch

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index acf2239b0251..041b8d109563 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -23,6 +23,7 @@ 
 #include <linux/of_platform.h>
 #include <linux/pci.h>
 #include <linux/printk.h>
+#include <linux/reset.h>
 #include <linux/sizes.h>
 #include <linux/slab.h>
 #include <linux/string.h>
@@ -158,6 +159,16 @@ 
 #define DATA_ADDR(pcie)			(pcie->reg_offsets[EXT_CFG_DATA])
 #define PCIE_RGR1_SW_INIT_1(pcie)	(pcie->reg_offsets[RGR1_SW_INIT_1])
 
+/* Rescal registers */
+#define PCIE_DVT_PMU_PCIE_PHY_CTRL				0xc700
+#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS			0x3
+#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_MASK		0x4
+#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_SHIFT	0x2
+#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_MASK		0x2
+#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_SHIFT		0x1
+#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_MASK		0x1
+#define  PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_SHIFT		0x0
+
 enum {
 	RGR1_SW_INIT_1,
 	EXT_CFG_INDEX,
@@ -247,6 +258,7 @@  struct brcm_pcie {
 	const int		*reg_offsets;
 	const int		*reg_field_info;
 	enum pcie_type		type;
+	struct reset_control	*rescal;
 };
 
 /*
@@ -965,6 +977,47 @@  static void brcm_pcie_enter_l23(struct brcm_pcie *pcie)
 		dev_err(pcie->dev, "failed to enter low-power link state\n");
 }
 
+static int brcm_phy_cntl(struct brcm_pcie *pcie, const int start)
+{
+	static const u32 shifts[PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS] = {
+		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_SHIFT,
+		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_SHIFT,
+		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_SHIFT,};
+	static const u32 masks[PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS] = {
+		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_PWRDN_MASK,
+		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_RESET_MASK,
+		PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_DIG_RESET_MASK,};
+	const int beg = start ? 0 : PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS - 1;
+	const int end = start ? PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS : -1;
+	u32 tmp, combined_mask = 0;
+	u32 val = !!start;
+	void __iomem *base = pcie->base;
+	int i;
+
+	for (i = beg; i != end; start ? i++ : i--) {
+		tmp = readl(base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
+		tmp = (tmp & ~masks[i]) | ((val << shifts[i]) & masks[i]);
+		writel(tmp, base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
+		usleep_range(50, 200);
+		combined_mask |= masks[i];
+	}
+
+	tmp = readl(base + PCIE_DVT_PMU_PCIE_PHY_CTRL);
+	val = start ? combined_mask : 0;
+
+	return (tmp & combined_mask) == val ? 0 : -EIO;
+}
+
+static inline int brcm_phy_start(struct brcm_pcie *pcie)
+{
+	return pcie->rescal ? brcm_phy_cntl(pcie, 1) : 0;
+}
+
+static inline int brcm_phy_stop(struct brcm_pcie *pcie)
+{
+	return pcie->rescal ? brcm_phy_cntl(pcie, 0) : 0;
+}
+
 static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
 {
 	void __iomem *base = pcie->base;
@@ -992,11 +1045,15 @@  static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
 static int brcm_pcie_suspend(struct device *dev)
 {
 	struct brcm_pcie *pcie = dev_get_drvdata(dev);
+	int ret;
 
 	brcm_pcie_turn_off(pcie);
+	ret = brcm_phy_stop(pcie);
+	if (ret)
+		dev_err(pcie->dev, "failed to stop phy\n");
 	clk_disable_unprepare(pcie->clk);
 
-	return 0;
+	return ret;
 }
 
 static int brcm_pcie_resume(struct device *dev)
@@ -1009,6 +1066,12 @@  static int brcm_pcie_resume(struct device *dev)
 	base = pcie->base;
 	clk_prepare_enable(pcie->clk);
 
+	ret = brcm_phy_start(pcie);
+	if (ret) {
+		dev_err(pcie->dev, "failed to start phy\n");
+		return ret;
+	}
+
 	/* Take bridge out of reset so we can access the SERDES reg */
 	brcm_pcie_bridge_sw_init_set(pcie, 0);
 
@@ -1034,6 +1097,9 @@  static void __brcm_pcie_remove(struct brcm_pcie *pcie)
 {
 	brcm_msi_remove(pcie);
 	brcm_pcie_turn_off(pcie);
+	if (brcm_phy_stop(pcie))
+		dev_err(pcie->dev, "failed to stop phy\n");
+	reset_control_assert(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 }
 
@@ -1112,6 +1178,20 @@  static int brcm_pcie_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "could not enable clock\n");
 		return ret;
 	}
+	pcie->rescal = devm_reset_control_get_optional_shared(&pdev->dev, "rescal");
+	if (IS_ERR(pcie->rescal))
+		return PTR_ERR(pcie->rescal);
+
+	ret = reset_control_deassert(pcie->rescal);
+	if (ret)
+		dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
+
+	ret = brcm_phy_start(pcie);
+	if (ret) {
+		dev_err(pcie->dev, "failed to start phy\n");
+		reset_control_assert(pcie->rescal);
+		return ret;
+	}
 
 	ret = brcm_pcie_setup(pcie);
 	if (ret)