Hi Greg, On Sun, Jul 01, 2018 at 10:45:52AM +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote: > > The patch below does not apply to the 4.14-stable tree. > If someone wants it applied there, or to any other stable or longterm > tree, then please email the backport, including the original git commit > id to <stable@xxxxxxxxxxxxxxx>. The attached backported patch should apply to 4.14-stable. -- Regards Sudip
>From 84e3dba350311d944c01cf882b8f37eaffb7b1e5 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> Date: Wed, 16 May 2018 10:42:39 +0200 Subject: [PATCH] spi: spi-s3c64xx: Fix system resume support commit e935dba111621bd6a0c5d48e6511a4d9885103b4 upstream Since Linux v4.10 release (commit 1d9174fbc55e "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@xxxxxxxxxxx> Reviewed-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx> --- drivers/spi/spi-s3c64xx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index b392cca8fa4f..1a6ec226d6e4 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -1273,8 +1273,6 @@ static int s3c64xx_spi_resume(struct device *dev) if (ret < 0) return ret; - s3c64xx_spi_hwinit(sdd, sdd->port_id); - return spi_master_resume(master); } #endif /* CONFIG_PM_SLEEP */ @@ -1312,6 +1310,8 @@ static int s3c64xx_spi_runtime_resume(struct device *dev) if (ret != 0) goto err_disable_src_clk; + s3c64xx_spi_hwinit(sdd, sdd->port_id); + return 0; err_disable_src_clk: -- 2.11.0
