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SubjectApplied "spi: imx: do not access registers while clocks disabled" to the spi tree
The patch

spi: imx: do not access registers while clocks disabled

has been applied to the spi tree at

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tree (usually sometime in the next 24 hours) and sent to Linus during
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From d593574aff0ab846136190b1729c151c736727ec Mon Sep 17 00:00:00 2001
From: Stefan Agner <>
Date: Sun, 7 Jan 2018 15:05:49 +0100
Subject: [PATCH] spi: imx: do not access registers while clocks disabled

Since clocks are disabled except during message transfer clocks
are also disabled when spi_imx_remove gets called. Accessing
registers leads to a freeeze at least on a i.MX 6ULL. Enable
clocks before disabling accessing the MXC_CSPICTRL register.

Fixes: 9e556dcc55774 ("spi: spi-imx: only enable the clocks when we start to transfer a message")
Signed-off-by: Stefan Agner <>
Signed-off-by: Mark Brown <>
drivers/spi/spi-imx.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 79ddefe4180d..40390d31a93b 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -1668,12 +1668,23 @@ static int spi_imx_remove(struct platform_device *pdev)
struct spi_master *master = platform_get_drvdata(pdev);
struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
+ int ret;


+ ret = clk_enable(spi_imx->clk_per);
+ if (ret)
+ return ret;
+ ret = clk_enable(spi_imx->clk_ipg);
+ if (ret) {
+ clk_disable(spi_imx->clk_per);
+ return ret;
+ }
writel(0, spi_imx->base + MXC_CSPICTRL);
- clk_unprepare(spi_imx->clk_ipg);
- clk_unprepare(spi_imx->clk_per);
+ clk_disable_unprepare(spi_imx->clk_ipg);
+ clk_disable_unprepare(spi_imx->clk_per);

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