linux-kernel - Re: [PATCH] firmware: qcom_scm: Fix legacy convention SCM accessors

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Date:   Mon, 13 Jul 2020 11:42:30 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Elliot Berman <eberman@...eaurora.org>
Cc:     Jonathan McDowell <noodles@...th.li>,
        Andy Gross <agross@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firmware: qcom_scm: Fix legacy convention SCM accessors

On Mon 13 Jul 09:35 PDT 2020, Elliot Berman wrote:

> For the Qualcomm TrustZone firmwares which I am familiar with:
> 
> Reviewed-by: Elliot Berman <eberman@...eaurora.org>
> 

Thanks for the patch Jonathan and thanks for the review Elliot!

Applied

Regards,
Bjorn

> On 7/4/2020 10:23 AM, Jonathan McDowell wrote:
> > The move to a combined driver for the QCOM SCM hardware changed the
> > io_writel and io_readl helpers to use non-atomic calls, despite the
> > commit message saying that atomic was a better option. This breaks these
> > helpers on hardware that uses the old legacy convention (access fails
> > with a -95 return code). Switch back to using the atomic calls.
> > 
> > Observed as a failure routing GPIO interrupts to the Apps processor on
> > an IPQ8064; fix is confirmed as correctly allowing the interrupts to be
> > routed and observed.
> > 
> > Fixes: 57d3b816718c ("firmware: qcom_scm: Remove thin wrappers")
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Jonathan McDowell <noodles@...th.li>
> > ---
> >  drivers/firmware/qcom_scm.c | 7 +++----
> >  1 file changed, 3 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> > index 0e7233a20f34..d4fda210adfe 100644
> > --- a/drivers/firmware/qcom_scm.c
> > +++ b/drivers/firmware/qcom_scm.c
> > @@ -391,7 +391,7 @@ static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
> >  
> >  	desc.args[1] = enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0;
> >  
> > -	return qcom_scm_call(__scm->dev, &desc, NULL);
> > +	return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
> >  }
> >  
> >  static void qcom_scm_set_download_mode(bool enable)
> > @@ -650,7 +650,7 @@ int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val)
> >  	int ret;
> >  
> >  
> > -	ret = qcom_scm_call(__scm->dev, &desc, &res);
> > +	ret = qcom_scm_call_atomic(__scm->dev, &desc, &res);
> >  	if (ret >= 0)
> >  		*val = res.result[0];
> >  
> > @@ -669,8 +669,7 @@ int qcom_scm_io_writel(phys_addr_t addr, unsigned int val)
> >  		.owner = ARM_SMCCC_OWNER_SIP,
> >  	};
> >  
> > -
> > -	return qcom_scm_call(__scm->dev, &desc, NULL);
> > +	return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
> >  }
> >  EXPORT_SYMBOL(qcom_scm_io_writel);
> >  
> > 
> 
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project