linux-kernel - [PATCH 2/2] reset: simple: read back to make sure changes are applied

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Message-Id: <20170308095423.3948-2-p.zabel@pengutronix.de>
Date:   Wed,  8 Mar 2017 10:54:23 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Andre Przywara <andre.przywara@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH 2/2] reset: simple: read back to make sure changes are applied

Read back the register after setting or clearing a reset bit to make
sure that the changes are applied to the reset controller hardware.
Theoretically, this avoids the write to stay stuck in a store buffer
during the delay of an assert-delay-deassert sequence, and makes sure
that the reset really is asserted for the specified duration.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
---
 drivers/reset/reset-simple.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/reset/reset-simple.c b/drivers/reset/reset-simple.c
index 2160e84fe216b..e32289bdaf0c6 100644
--- a/drivers/reset/reset-simple.c
+++ b/drivers/reset/reset-simple.c
@@ -33,13 +33,16 @@ static int reset_simple_clear(struct reset_controller_dev *rcdev,
 	int reg_width = sizeof(u32);
 	int bank = id / (reg_width * BITS_PER_BYTE);
 	int offset = id % (reg_width * BITS_PER_BYTE);
+	void __iomem *addr = data->membase + (bank * reg_width);
 	unsigned long flags;
 	u32 reg;
 
 	spin_lock_irqsave(&data->lock, flags);
 
-	reg = readl(data->membase + (bank * reg_width));
-	writel(reg & ~BIT(offset), data->membase + (bank * reg_width));
+	reg = readl(addr);
+	writel(reg & ~BIT(offset), addr);
+	/* Read back to make sure the write doesn't linger in a store buffer */
+	readl(addr);
 
 	spin_unlock_irqrestore(&data->lock, flags);
 
@@ -53,13 +56,16 @@ static int reset_simple_set(struct reset_controller_dev *rcdev,
 	int reg_width = sizeof(u32);
 	int bank = id / (reg_width * BITS_PER_BYTE);
 	int offset = id % (reg_width * BITS_PER_BYTE);
+	void __iomem *addr = data->membase + (bank * reg_width);
 	unsigned long flags;
 	u32 reg;
 
 	spin_lock_irqsave(&data->lock, flags);
 
-	reg = readl(data->membase + (bank * reg_width));
-	writel(reg | BIT(offset), data->membase + (bank * reg_width));
+	reg = readl(addr);
+	writel(reg | BIT(offset), addr);
+	/* Read back to make sure the write doesn't linger in a store buffer */
+	readl(addr);
 
 	spin_unlock_irqrestore(&data->lock, flags);
 
-- 
2.11.0