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spi: imx: do not access registers while clocks disabled

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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: 9e556dcc55 ("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>
Cc: stable@vger.kernel.org
This commit is contained in:
Stefan Agner 2018-01-07 15:05:49 +01:00 committed by Mark Brown
parent 4fbd8d194f
commit d593574aff
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GPG key ID: 24D68B725D5487D0
1 changed files with 13 additions and 2 deletions
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15
drivers/spi/spi-imx.c
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@ -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;
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);