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spi: spi-s3c64xx: Fix system resume support 

Since Linux v4.10 release (commit 1d9174fbc5 "PM / Runtime: Defer
resuming of the device in pm_runtime_force_resume()"),
pm_runtime_force_resume() function doesn't runtime resume device if it was
not runtime active before system suspend. Thus, driver should not do any
register access after pm_runtime_force_resume() without checking the
runtime status of the device. To fix this issue, simply move
s3c64xx_spi_hwinit() call to s3c64xx_spi_runtime_resume() to ensure that
hardware is always properly initialized. This fixes Synchronous external
abort issue on system suspend/resume cycle on newer Exynos SoCs.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
hifive-unleashed-5.1
Marek Szyprowski 2018-05-16 10:42:39 +02:00 committed by Mark Brown
parent b645605703
commit e935dba111
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GPG Key ID: 24D68B725D5487D0
1 changed files with 2 additions and 2 deletions
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4
drivers/spi/spi-s3c64xx.c
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@ -1292,8 +1292,6 @@ static int s3c64xx_spi_resume(struct device *dev)
if (ret < 0)
return ret;
s3c64xx_spi_hwinit(sdd);
return spi_master_resume(master);
}
#endif /* CONFIG_PM_SLEEP */
@ -1331,6 +1329,8 @@ static int s3c64xx_spi_runtime_resume(struct device *dev)
if (ret != 0)
goto err_disable_src_clk;
s3c64xx_spi_hwinit(sdd);
return 0;
err_disable_src_clk: