Re: [PATCH] crypto: qce - Add suspend and resume support

[Stephan Gerhold <stephan.gerhold@linaro.org>]

On Fri, Jun 06, 2025 at 04:28:08PM +0530, quic_utiwari@quicinc.com wrote:
> From: Udit Tiwari <quic_utiwari@quicinc.com>
> 
> Add basic suspend and resume callbacks to the QCE platform driver to
> manage interconnect bandwidth during system sleep and wake-up cycles.
> 
> Signed-off-by: Udit Tiwari <quic_utiwari@quicinc.com>

Can you add runtime PM support instead, so we can also reduce the
bandwidth/power consumption at runtime when QCE is not used?

Also, what about the clocks? They should also be disabled, not just the
bandwidth.

Thanks,
Stephan

> ---
>  drivers/crypto/qce/core.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c
> index e95e84486d9a..2566bdad5d4a 100644
> --- a/drivers/crypto/qce/core.c
> +++ b/drivers/crypto/qce/core.c
> @@ -249,6 +249,21 @@ static int qce_crypto_probe(struct platform_device *pdev)
>  	return devm_qce_register_algs(qce);
>  }
>  
> +static int qce_crypto_suspend(struct platform_device *pdev, pm_message_t state)
> +{
> +	struct qce_device *qce = platform_get_drvdata(pdev);
> +
> +	return icc_set_bw(qce->mem_path, 0, 0);
> +}
> +
> +static int qce_crypto_resume(struct platform_device *pdev)
> +{
> +	struct qce_device *qce = platform_get_drvdata(pdev);
> +
> +	return icc_set_bw(qce->mem_path, QCE_DEFAULT_MEM_BANDWIDTH,
> +		QCE_DEFAULT_MEM_BANDWIDTH);
> +}
> +
>  static const struct of_device_id qce_crypto_of_match[] = {
>  	{ .compatible = "qcom,crypto-v5.1", },
>  	{ .compatible = "qcom,crypto-v5.4", },
> @@ -259,6 +274,8 @@ MODULE_DEVICE_TABLE(of, qce_crypto_of_match);
>  
>  static struct platform_driver qce_crypto_driver = {
>  	.probe = qce_crypto_probe,
> +	.suspend = qce_crypto_suspend,
> +	.resume = qce_crypto_resume,
>  	.driver = {
>  		.name = KBUILD_MODNAME,
>  		.of_match_table = qce_crypto_of_match,
> -- 
> 2.34.1
>