rpmsg: core: add support to power domains for devices

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@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index b714a543a91d93c8fff11766fcd867c7bc8a1a68..8122807db380949b44624866a9403ddbc0569d15 100644 (file)
--- 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 *dev)
        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 device *dev)
 
        rpdrv->remove(rpdev);
 
+       dev_pm_domain_detach(dev, true);
+
        if (rpdev->ept)
                rpmsg_destroy_ept(rpdev->ept);