Patch "spi: omap2-mcspi: add runtime PM to set_cs()" has been added to the 4.2-stable tree

Patch "spi: omap2-mcspi: add runtime PM to set_cs()" has been added to the 4.2-stable tree

[gregkh]

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@vger.kernel.org> know about it.


>From 5f74db105b1c0980c9863e7a7d1bc0525e0316e8 Mon Sep 17 00:00:00 2001
From: Sebastian Reichel <sre@kernel.org>
Date: Wed, 22 Jul 2015 20:46:09 +0200
Subject: spi: omap2-mcspi: add runtime PM to set_cs()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Sebastian Reichel <sre@kernel.org>

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@gmail.com>
Fixes: ddcad7e9068eb (spi: omap2-mcspi: Fix native cs with new set_cs)
Tested-By: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Acked-by: Michael Welling <mwelling@ieee.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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@kernel.org are

queue-4.2/spi-omap2-mcspi-add-runtime-pm-to-set_cs.patch