[PATCH v3 0/2] ata: ahci_brcm: Fix use of BCM7216 reset controller

[PATCH v3 0/2] ata: ahci_brcm: Fix use of BCM7216 reset controller

[Jim Quinlan]

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v3 -- discard commit from v2; instead relay on the new function
      reset_control_rearm provided in a recent commit [1] applied
      to reset/next.
   -- New commit to correct pcie-brcmstb.c usage of a reset controller
      to use reset/rearm verses deassert/assert.

v2 -- refactor rescal-reset driver to implement assert/deassert rather than
      reset because the reset call only fires once per lifetime and we need
      to reset after every resume from S2 or S3.
   -- Split the use of "ahci" and "rescal" controllers in separate fields
      to keep things simple.

v1 -- original


[1] Applied commit "reset: make shared pulsed reset controls re-triggerable"
    found at git://git.pengutronix.de/git/pza/linux.git
    branch reset/shared-retrigger

Jim Quinlan (2):
  ata: ahci_brcm: Fix use of BCM7216 reset controller
  PCI: brcmstb: use reset/rearm instead of deassert/assert

 drivers/ata/ahci_brcm.c               | 46 +++++++++++++--------------
 drivers/pci/controller/pcie-brcmstb.c | 19 +++++++----
 2 files changed, 36 insertions(+), 29 deletions(-)

-- 
2.17.1


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[PATCH v3 1/2] ata: ahci_brcm: Fix use of BCM7216 reset controller

[Jim Quinlan]

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From: Jim Quinlan <jquinlan@broadcom.com>

This driver may use one of two resets controllers.  Keep them in separate
variables to keep things simple.  The reset controller "rescal" is shared
between the AHCI driver and the PCIe driver for the BrcmSTB 7216 chip.  Use
devm_reset_control_get_optional_shared() to handle this sharing.

Fixes: 272ecd60a636 ("ata: ahci_brcm: BCM7216 reset is self de-asserting")
Fixes: c345ec6a50e9 ("ata: ahci_brcm: Support BCM7216 reset controller name")
Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
---
 drivers/ata/ahci_brcm.c | 46 ++++++++++++++++++++---------------------
 1 file changed, 23 insertions(+), 23 deletions(-)

diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
index 49f7acbfcf01..bad455fb6ab8 100644
--- a/drivers/ata/ahci_brcm.c
+++ b/drivers/ata/ahci_brcm.c
@@ -86,7 +86,8 @@ struct brcm_ahci_priv {
 	u32 port_mask;
 	u32 quirks;
 	enum brcm_ahci_version version;
-	struct reset_control *rcdev;
+	struct reset_control *rcdev_rescal;
+	struct reset_control *rcdev_ahci;
 };
 
 static inline u32 brcm_sata_readreg(void __iomem *addr)
@@ -352,8 +353,8 @@ static int brcm_ahci_suspend(struct device *dev)
 	else
 		ret = 0;
 
-	if (priv->version != BRCM_SATA_BCM7216)
-		reset_control_assert(priv->rcdev);
+	reset_control_assert(priv->rcdev_ahci);
+	reset_control_rearm(priv->rcdev_rescal);
 
 	return ret;
 }
@@ -365,10 +366,10 @@ static int __maybe_unused brcm_ahci_resume(struct device *dev)
 	struct brcm_ahci_priv *priv = hpriv->plat_data;
 	int ret = 0;
 
-	if (priv->version == BRCM_SATA_BCM7216)
-		ret = reset_control_reset(priv->rcdev);
-	else
-		ret = reset_control_deassert(priv->rcdev);
+	ret = reset_control_deassert(priv->rcdev_ahci);
+	if (ret)
+		return ret;
+	ret = reset_control_reset(priv->rcdev_rescal);
 	if (ret)
 		return ret;
 
@@ -428,7 +429,6 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *of_id;
 	struct device *dev = &pdev->dev;
-	const char *reset_name = NULL;
 	struct brcm_ahci_priv *priv;
 	struct ahci_host_priv *hpriv;
 	struct resource *res;
@@ -450,15 +450,15 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->top_ctrl))
 		return PTR_ERR(priv->top_ctrl);
 
-	/* Reset is optional depending on platform and named differently */
-	if (priv->version == BRCM_SATA_BCM7216)
-		reset_name = "rescal";
-	else
-		reset_name = "ahci";
-
-	priv->rcdev = devm_reset_control_get_optional(&pdev->dev, reset_name);
-	if (IS_ERR(priv->rcdev))
-		return PTR_ERR(priv->rcdev);
+	if (priv->version == BRCM_SATA_BCM7216) {
+		priv->rcdev_rescal = devm_reset_control_get_optional_shared(
+			&pdev->dev, "rescal");
+		if (IS_ERR(priv->rcdev_rescal))
+			return PTR_ERR(priv->rcdev_rescal);
+	}
+	priv->rcdev_ahci = devm_reset_control_get_optional(&pdev->dev, "ahci");
+	if (IS_ERR(priv->rcdev_ahci))
+		return PTR_ERR(priv->rcdev_ahci);
 
 	hpriv = ahci_platform_get_resources(pdev, 0);
 	if (IS_ERR(hpriv))
@@ -479,10 +479,10 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 		break;
 	}
 
-	if (priv->version == BRCM_SATA_BCM7216)
-		ret = reset_control_reset(priv->rcdev);
-	else
-		ret = reset_control_deassert(priv->rcdev);
+	ret = reset_control_reset(priv->rcdev_rescal);
+	if (ret)
+		return ret;
+	ret = reset_control_deassert(priv->rcdev_ahci);
 	if (ret)
 		return ret;
 
@@ -527,8 +527,8 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 out_disable_clks:
 	ahci_platform_disable_clks(hpriv);
 out_reset:
-	if (priv->version != BRCM_SATA_BCM7216)
-		reset_control_assert(priv->rcdev);
+	reset_control_assert(priv->rcdev_ahci);
+	reset_control_rearm(priv->rcdev_rescal);
 	return ret;
 }
 
-- 
2.17.1


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[PATCH v3 2/2] PCI: brcmstb: use reset/rearm instead of deassert/assert

[Jim Quinlan]

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The Brcmstb PCIe RC uses a reset control "rescal" for certain chips.  This
reset implements a "pulse reset" so it matches more the reset/rearm
calls instead of the deassert/assert calls.

Also, add reset_control calls in suspend/resume functions.

Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
---
 drivers/pci/controller/pcie-brcmstb.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index bea86899bd5d..b9745ac2ee0b 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -1138,6 +1138,7 @@ static int brcm_pcie_suspend(struct device *dev)
 
 	brcm_pcie_turn_off(pcie);
 	ret = brcm_phy_stop(pcie);
+	reset_control_rearm(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 
 	return ret;
@@ -1153,9 +1154,13 @@ static int brcm_pcie_resume(struct device *dev)
 	base = pcie->base;
 	clk_prepare_enable(pcie->clk);
 
+	ret = reset_control_reset(pcie->rescal);
+	if (ret)
+		goto err0;
+
 	ret = brcm_phy_start(pcie);
 	if (ret)
-		goto err;
+		goto err1;
 
 	/* Take bridge out of reset so we can access the SERDES reg */
 	pcie->bridge_sw_init_set(pcie, 0);
@@ -1170,14 +1175,16 @@ static int brcm_pcie_resume(struct device *dev)
 
 	ret = brcm_pcie_setup(pcie);
 	if (ret)
-		goto err;
+		goto err1;
 
 	if (pcie->msi)
 		brcm_msi_set_regs(pcie->msi);
 
 	return 0;
 
-err:
+err1:
+	reset_control_rearm(pcie->rescal);
+err0:
 	clk_disable_unprepare(pcie->clk);
 	return ret;
 }
@@ -1187,7 +1194,7 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
 	brcm_msi_remove(pcie);
 	brcm_pcie_turn_off(pcie);
 	brcm_phy_stop(pcie);
-	reset_control_assert(pcie->rescal);
+	reset_control_rearm(pcie->rescal);
 	clk_disable_unprepare(pcie->clk);
 }
 
@@ -1262,13 +1269,13 @@ static int brcm_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(pcie->rescal);
 	}
 
-	ret = reset_control_deassert(pcie->rescal);
+	ret = reset_control_reset(pcie->rescal);
 	if (ret)
 		dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
 
 	ret = brcm_phy_start(pcie);
 	if (ret) {
-		reset_control_assert(pcie->rescal);
+		reset_control_rearm(pcie->rescal);
 		clk_disable_unprepare(pcie->clk);
 		return ret;
 	}
-- 
2.17.1


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