linux-kernel - Re: [PATCH v5 14/22] crypto: qce: core: Add support to initialize interconnect path

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Message-ID: <54178c8f-b9f9-1e8a-9a09-0e3ccaf6d5da@linaro.org>
Date:   Fri, 12 Nov 2021 12:40:55 +0200
From:   Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-crypto@...r.kernel.org
Cc:     bhupesh.linux@...il.com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org, agross@...nel.org,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        stephan@...hold.net, Thara Gopinath <thara.gopinath@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH v5 14/22] crypto: qce: core: Add support to initialize
 interconnect path

Hi Bhupesh,

On 11/10/21 12:59 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 and use devm_of_icc_get()]
> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>

similar SoB swap is expected above.

> ---
>   drivers/crypto/qce/core.c | 34 +++++++++++++++++++++++++++-------
>   drivers/crypto/qce/core.h |  1 +
>   2 files changed, 28 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c
> index d3780be44a76..89d9c01ba009 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 = devm_of_icc_get(qce->dev, "memory");
> +	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;
> +	}
>   
>   	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;
> +	}
>   
>   	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;

formally all these changes from 'return' to 'goto err' are not needed,
the necessity of such a transition will be required in a later change.

Please consider to move addition of 'err' goto label directly into
patch v5 18/22 -- since I still think that v17/22 is not needed...

> +	}
> +
> +	ret = icc_set_bw(qce->mem_path, QCE_DEFAULT_MEM_BANDWIDTH, QCE_DEFAULT_MEM_BANDWIDTH);
> +	if (ret)
> +		goto err;
>   
>   	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 +277,9 @@ 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:
>   	return ret;

See my comment above.

>   }
>   
> 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