linux-kernel - Re: [PATCH v2 05/10] rpmsg: smd: allow opening rpm

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Date:   Tue, 15 Mar 2022 21:14:35 +0100
From:   Luca Weiss <luca@...tu.xyz>
To:     linux-arm-msm@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/10] rpmsg: smd: allow opening rpm_requests even if already opened

On Montag, 14. März 2022 20:08:20 CET Luca Weiss wrote:
> Hi all,
> 
> any feedback on this patch? It's needed for msm8953 to boot properly.

I was informed that the patch has already been applied and is now also present 
in linux-next, so please disregard my last email.

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?
id=a8f8cc6b39b7ee0dbaccbebd1268c9d3458ebf13

Regards
Luca

> 
> Regards
> Luca
> 
> On Sonntag, 20. Februar 2022 21:18:58 CET Luca Weiss wrote:
> > On msm8953 the channel seems to be already opened when booting Linux but
> > we still need to open it for communication with regulators etc.
> > 
> > Signed-off-by: Luca Weiss <luca@...tu.xyz>
> > ---
> > Changes in v2:
> > - rework original patch, don't drop condition completely but allow force
> > 
> >   opening rpm_requests channel
> >  
> >  drivers/rpmsg/qcom_smd.c | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
> > index 540e027f08c4..887e21ca51f2 100644
> > --- a/drivers/rpmsg/qcom_smd.c
> > +++ b/drivers/rpmsg/qcom_smd.c
> > @@ -1288,9 +1288,14 @@ static void qcom_channel_state_worker(struct
> > work_struct *work) if (channel->state != SMD_CHANNEL_CLOSED)
> > 
> >  			continue;
> > 
> > +		/*
> > +		 * Always open rpm_requests, even when already opened
> 
> which is
> 
> > +		 * required on some SoCs like msm8953.
> > +		 */
> > 
> >  		remote_state = GET_RX_CHANNEL_INFO(channel, state);
> >  		if (remote_state != SMD_CHANNEL_OPENING &&
> > 
> > -		    remote_state != SMD_CHANNEL_OPENED)
> > +		    remote_state != SMD_CHANNEL_OPENED &&
> > +		    strcmp(channel->name, "rpm_requests"))
> > 
> >  			continue;
> >  		
> >  		if (channel->registered)