linux-kernel - [PATCH 4.17 001/336] spi: spi-s3c64xx: Fix system resume support

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Date:   Wed,  1 Aug 2018 18:45:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 4.17 001/336] spi: spi-s3c64xx: Fix system resume support

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marek Szyprowski <m.szyprowski@...sung.com>

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@...sung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
Cc: stable@...r.kernel.org
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/spi/spi-s3c64xx.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -1260,8 +1260,6 @@ static int s3c64xx_spi_resume(struct dev
 	if (ret < 0)
 		return ret;

-	s3c64xx_spi_hwinit(sdd, sdd->port_id);
-
 	return spi_master_resume(master);
 }
 #endif /* CONFIG_PM_SLEEP */
@@ -1299,6 +1297,8 @@ static int s3c64xx_spi_runtime_resume(st
 	if (ret != 0)
 		goto err_disable_src_clk;

+	s3c64xx_spi_hwinit(sdd, sdd->port_id);
+
 	return 0;

 err_disable_src_clk: