4.18-stable review patch. If anyone has any objections, please let me know.
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From: Srinivas Kandagatla srinivas.kandagatla@linaro.org
[ 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@linaro.org Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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
rpdrv->remove(rpdev);
+ dev_pm_domain_detach(dev, true); + if (rpdev->ept) rpmsg_destroy_ept(rpdev->ept);