linux-kernel - [PATCH v3 3/3] ata: ahci_brcm: BCM7216 reset is self de-asserting

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Date:   Tue,  7 Jan 2020 10:30:22 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     bcm-kernel-feedback-list@...adcom.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Jens Axboe <axboe@...nel.dk>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Hans de Goede <hdegoede@...hat.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Tejun Heo <tj@...nel.org>, Jaedon Shin <jaedon.shin@...il.com>,
        linux-ide@...r.kernel.org (open list:LIBATA SUBSYSTEM (Serial and
        Parallel ATA drivers)),
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS)
Subject: [PATCH v3 3/3] ata: ahci_brcm: BCM7216 reset is self de-asserting

The BCM7216 reset controller line is self-deasserting, unlike other
platforms, so make use of reset_control_reset() instead of
reset_control_deassert().

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/ata/ahci_brcm.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
index c229fea39a47..62c948e56beb 100644
--- a/drivers/ata/ahci_brcm.c
+++ b/drivers/ata/ahci_brcm.c
@@ -352,7 +352,10 @@ static int brcm_ahci_suspend(struct device *dev)
 	if (ret)
 		return ret;
 
-	return reset_control_assert(priv->rcdev);
+	if (priv->version != BRCM_SATA_BCM7216)
+		ret = reset_control_assert(priv->rcdev);
+
+	return ret;
 }
 
 static int brcm_ahci_resume(struct device *dev)
@@ -362,7 +365,10 @@ static int brcm_ahci_resume(struct device *dev)
 	struct brcm_ahci_priv *priv = hpriv->plat_data;
 	int ret = 0;
 
-	ret = reset_control_deassert(priv->rcdev);
+	if (priv->version == BRCM_SATA_BCM7216)
+		ret = reset_control_reset(priv->rcdev);
+	else
+		ret = reset_control_deassert(priv->rcdev);
 	if (ret)
 		return ret;
 
@@ -475,7 +481,10 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 		break;
 	}
 
-	ret = reset_control_deassert(priv->rcdev);
+	if (priv->version == BRCM_SATA_BCM7216)
+		ret = reset_control_reset(priv->rcdev);
+	else
+		ret = reset_control_deassert(priv->rcdev);
 	if (ret)
 		return ret;
 
@@ -520,7 +529,8 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 out_disable_clks:
 	ahci_platform_disable_clks(hpriv);
 out_reset:
-	reset_control_assert(priv->rcdev);
+	if (priv->version != BRCM_SATA_BCM7216)
+		reset_control_assert(priv->rcdev);
 	return ret;
 }
 
-- 
2.17.1