[PATCH 4.18 096/158] rpmsg: core: add support to power domains for devices

From: Greg Kroah-Hartman
Date: Mon Sep 17 2018 - 19:11:53 EST

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


From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>

[ Upstream commit fe782affd0f440a4e60e2cc81b8f2eccb2923113 ]

Some of the rpmsg devices need to switch on power domains to communicate
with remote processor. For example on Qualcomm DB820c platform LPASS
power domain needs to switched on for any kind of audio services.
This patch adds the missing power domain support in rpmsg core.

Without this patch attempting to play audio via QDSP on DB820c would
reboot the system.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/rpmsg/rpmsg_core.c | 7 +++++++
1 file changed, 7 insertions(+)

--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/rpmsg.h>
#include <linux/of_device.h>
+#include <linux/pm_domain.h>
#include <linux/slab.h>

#include "rpmsg_internal.h"
@@ -449,6 +450,10 @@ static int rpmsg_dev_probe(struct device
struct rpmsg_endpoint *ept = NULL;
int err;

+ err = dev_pm_domain_attach(dev, true);
+ if (err)
+ goto out;
if (rpdrv->callback) {
strncpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE);
chinfo.src = rpdev->src;
@@ -490,6 +495,8 @@ static int rpmsg_dev_remove(struct devic


+ dev_pm_domain_detach(dev, true);
if (rpdev->ept)