Hi Suman
On 09/25/2018 02:25 AM, Suman Anna wrote:
> Hi Srinivas,
>
> On 06/15/2018 04:59 AM, Srinivas Kandagatla wrote:
>> 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>
>> ---
>> drivers/rpmsg/rpmsg_core.c | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
>> index b714a543a91d..8122807db380 100644
>> --- 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;
>
> This patch has broken the virtio-rpmsg stack based rpmsg devices. These
> devices are non-DT and the rpmsg_dev_probe() is now failing with -19
> (-ENODEV) error code.
>
> Loic, Arnaud,
> Can one of you double-confirm this behavior on ST platforms as well?
> The patch came through 4.14.71 stable release and broke our downstream
> kernels.
I do not reproduce issue on 4.14.0 + your patch, on my ST platform (not
able to test on the LTS branch).
By looking the source code, seems that your issue is related to
genpd_dev_pm_attach that returns -ENODEV because you have
no remoteproc device node...
Do you have a rproc node defined in your DT? we have one.
Regards
Arnaud
>
> regards
> Suman
>
>> +
>> 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);
>>
>>
>
