linux-kernel - Re: [PATCH v4 14/20] crypto: qce: core: Add support to initialize interconnect path

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Date:   Sun, 24 Oct 2021 19:23:14 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
Cc:     MSM <linux-arm-msm@...r.kernel.org>, linux-crypto@...r.kernel.org,
        bhupesh.linux@...il.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH v4 14/20] crypto: qce: core: Add support to initialize
 interconnect path

Hi Vladimir,

On Thu, 14 Oct 2021 at 00:49, Vladimir Zapolskiy
<vladimir.zapolskiy@...aro.org> wrote:
>
> Hi Bhupesh,
>
> On 10/13/21 1:55 PM, Bhupesh Sharma wrote:
> > From: Thara Gopinath <thara.gopinath@...aro.org>
> >
> > Crypto engine on certain Snapdragon processors like sm8150, sm8250, sm8350
> > etc. requires interconnect path between the engine and memory to be
> > explicitly enabled and bandwidth set prior to any operations. Add support
> > in the qce core to enable the interconnect path appropriately.
> >
> > Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> > [Make header file inclusion alphabetical]
> > Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
> > ---
> >   drivers/crypto/qce/core.c | 35 ++++++++++++++++++++++++++++-------
> >   drivers/crypto/qce/core.h |  1 +
> >   2 files changed, 29 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c
> > index d3780be44a76..033c7278aa5d 100644
> > --- a/drivers/crypto/qce/core.c
> > +++ b/drivers/crypto/qce/core.c
> > @@ -5,6 +5,7 @@
> >
> >   #include <linux/clk.h>
> >   #include <linux/dma-mapping.h>
> > +#include <linux/interconnect.h>
> >   #include <linux/interrupt.h>
> >   #include <linux/module.h>
> >   #include <linux/mod_devicetable.h>
> > @@ -22,6 +23,8 @@
> >   #define QCE_MAJOR_VERSION5  0x05
> >   #define QCE_QUEUE_LENGTH    1
> >
> > +#define QCE_DEFAULT_MEM_BANDWIDTH    393600
> > +
> >   static const struct qce_algo_ops *qce_ops[] = {
> >   #ifdef CONFIG_CRYPTO_DEV_QCE_SKCIPHER
> >       &skcipher_ops,
> > @@ -206,21 +209,35 @@ static int qce_crypto_probe(struct platform_device *pdev)
> >       if (ret < 0)
> >               return ret;
> >
> > +     qce->mem_path = of_icc_get(qce->dev, "memory");
>
> Please consider to use devm_of_icc_get() here also.

Thanks, I will fix this in the v5.

Regards,
Bhupesh

> > +     if (IS_ERR(qce->mem_path))
> > +             return PTR_ERR(qce->mem_path);
> > +
> >       qce->core = devm_clk_get(qce->dev, "core");
> > -     if (IS_ERR(qce->core))
> > -             return PTR_ERR(qce->core);
> > +     if (IS_ERR(qce->core)) {
> > +             ret = PTR_ERR(qce->core);
> > +             goto err_mem_path_put;
> > +     }
> >
> >       qce->iface = devm_clk_get(qce->dev, "iface");
> > -     if (IS_ERR(qce->iface))
> > -             return PTR_ERR(qce->iface);
> > +     if (IS_ERR(qce->iface)) {
> > +             ret = PTR_ERR(qce->iface);
> > +             goto err_mem_path_put;
> > +     }
> >
> >       qce->bus = devm_clk_get(qce->dev, "bus");
> > -     if (IS_ERR(qce->bus))
> > -             return PTR_ERR(qce->bus);
> > +     if (IS_ERR(qce->bus)) {
> > +             ret = PTR_ERR(qce->bus);
> > +             goto err_mem_path_put;
> > +     }
> > +
> > +     ret = icc_set_bw(qce->mem_path, QCE_DEFAULT_MEM_BANDWIDTH, QCE_DEFAULT_MEM_BANDWIDTH);
> > +     if (ret)
> > +             goto err_mem_path_put;
> >
> >       ret = clk_prepare_enable(qce->core);
> >       if (ret)
> > -             return ret;
> > +             goto err_mem_path_disable;
> >
> >       ret = clk_prepare_enable(qce->iface);
> >       if (ret)
> > @@ -260,6 +277,10 @@ static int qce_crypto_probe(struct platform_device *pdev)
> >       clk_disable_unprepare(qce->iface);
> >   err_clks_core:
> >       clk_disable_unprepare(qce->core);
> > +err_mem_path_disable:
> > +     icc_set_bw(qce->mem_path, 0, 0);
> > +err_mem_path_put:
> > +     icc_put(qce->mem_path);
> >       return ret;
> >   }
> >
> > diff --git a/drivers/crypto/qce/core.h b/drivers/crypto/qce/core.h
> > index 085774cdf641..228fcd69ec51 100644
> > --- a/drivers/crypto/qce/core.h
> > +++ b/drivers/crypto/qce/core.h
> > @@ -35,6 +35,7 @@ struct qce_device {
> >       void __iomem *base;
> >       struct device *dev;
> >       struct clk *core, *iface, *bus;
> > +     struct icc_path *mem_path;
> >       struct qce_dma_data dma;
> >       int burst_size;
> >       unsigned int pipe_pair_id;
> >
>
> --
> Best wishes,
> Vladimir