Home Home > GIT Browse
summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorStefan Agner <stefan@agner.ch>2018-01-07 15:05:49 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-02-03 17:05:43 +0100
commit1333c3e996eb799286ee2ef2c01752da45bf926f (patch)
treec4bb05a72e26715f4fe0a9a0ad903e10a9a2cee4
parent5846849a1ac75c4a4898f09f3835ac737bb888d5 (diff)
spi: imx: do not access registers while clocks disabled
commit d593574aff0ab846136190b1729c151c736727ec upstream. 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 <stefan@agner.ch> Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/spi/spi-imx.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index deb782f6556c..a6e34f05d44d 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -1307,12 +1307,23 @@ 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;
spi_bitbang_stop(&spi_imx->bitbang);
+ 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);
spi_imx_sdma_exit(spi_imx);
spi_master_put(master);