linux-kernel - [PATCH 5.4 11/71] spi: spi-nxp-fspi: move the register operation after the clock enable

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Message-Id: <20210628143004.32596-12-sashal@kernel.org>
Date:   Mon, 28 Jun 2021 10:29:04 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Haibo Chen <haibo.chen@....com>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 11/71] spi: spi-nxp-fspi: move the register operation after the clock enable

From: Haibo Chen <haibo.chen@....com>

[ Upstream commit f422316c8e9d3c4aff3c56549dfb44a677d02f14 ]

Move the register operation after the clock enable, otherwise system
will stuck when this driver probe.

Fixes: 71d80563b076 ("spi: spi-nxp-fspi: fix fspi panic by unexpected interrupts")
Signed-off-by: Haibo Chen <haibo.chen@....com>
Link: https://lore.kernel.org/r/1623317073-25158-1-git-send-email-haibo.chen@nxp.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-nxp-fspi.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index efd9e908e224..36a44a837031 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -975,12 +975,6 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 		goto err_put_ctrl;
 	}
 
-	/* Clear potential interrupts */
-	reg = fspi_readl(f, f->iobase + FSPI_INTR);
-	if (reg)
-		fspi_writel(f, reg, f->iobase + FSPI_INTR);
-
-
 	/* find the resources - controller memory mapped space */
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fspi_mmap");
 	f->ahb_addr = devm_ioremap_resource(dev, res);
@@ -1012,6 +1006,11 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 		goto err_put_ctrl;
 	}
 
+	/* Clear potential interrupts */
+	reg = fspi_readl(f, f->iobase + FSPI_INTR);
+	if (reg)
+		fspi_writel(f, reg, f->iobase + FSPI_INTR);
+
 	/* find the irq */
 	ret = platform_get_irq(pdev, 0);
 	if (ret < 0)
-- 
2.30.2