This is a note to let you know that I've just added the patch titled
spi: omap2-mcspi: add runtime PM to set_cs()
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-omap2-mcspi-add-runtime-pm-to-set_cs.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5f74db105b1c0980c9863e7a7d1bc0525e0316e8 Mon Sep 17 00:00:00 2001
From: Sebastian Reichel <sre@xxxxxxxxxx>
Date: Wed, 22 Jul 2015 20:46:09 +0200
Subject: spi: omap2-mcspi: add runtime PM to set_cs()
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From: Sebastian Reichel <sre@xxxxxxxxxx>
commit 5f74db105b1c0980c9863e7a7d1bc0525e0316e8 upstream.
Since commit ddcad7e9068eb omap2_mcspi_set_cs() is called without
runtime power management requested. This patch fixes the problem by
requesting runtime power management in omap2_mcspi_set_cs().
Reported-By: Pali Rohár <pali.rohar@xxxxxxxxx>
Fixes: ddcad7e9068eb (spi: omap2-mcspi: Fix native cs with new set_cs)
Tested-By: Pavel Machek <pavel@xxxxxx>
Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx>
Acked-by: Michael Welling <mwelling@xxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-omap2-mcspi.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -245,6 +245,7 @@ static void omap2_mcspi_set_enable(const
static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable)
{
+ struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
u32 l;
/* The controller handles the inverted chip selects
@@ -255,6 +256,12 @@ static void omap2_mcspi_set_cs(struct sp
enable = !enable;
if (spi->controller_state) {
+ int err = pm_runtime_get_sync(mcspi->dev);
+ if (err < 0) {
+ dev_err(mcspi->dev, "failed to get sync: %d\n", err);
+ return;
+ }
+
l = mcspi_cached_chconf0(spi);
if (enable)
@@ -263,6 +270,9 @@ static void omap2_mcspi_set_cs(struct sp
l |= OMAP2_MCSPI_CHCONF_FORCE;
mcspi_write_chconf0(spi, l);
+
+ pm_runtime_mark_last_busy(mcspi->dev);
+ pm_runtime_put_autosuspend(mcspi->dev);
}
}
Patches currently in stable-queue which might be from sre@xxxxxxxxxx are
queue-4.2/spi-omap2-mcspi-add-runtime-pm-to-set_cs.patch
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