linux-kernel - Re: [PATCH v5 5/6] mmc: sdhci-msm: Switch to the new ICE API

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Message-ID: <20230406202230.GB20288@sol.localdomain>
Date:   Thu, 6 Apr 2023 13:22:30 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Abel Vesa <abel.vesa@...aro.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH v5 5/6] mmc: sdhci-msm: Switch to the new ICE API

On Mon, Apr 03, 2023 at 11:05:29PM +0300, Abel Vesa wrote:
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 8ac81d57a3df..1a6e63b7af12 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -19,6 +19,8 @@
>  #include <linux/firmware/qcom/qcom_scm.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/interconnect.h>
>  #include <linux/pinctrl/consumer.h>
>  #include <linux/reset.h>
>  
> +#include <soc/qcom/ice.h>

The include of <linux/firmware/qcom/qcom_scm.h> should be removed.

>  static int sdhci_msm_ice_init(struct sdhci_msm_host *msm_host,
>  			      struct cqhci_host *cq_host)
>  {
>  	struct mmc_host *mmc = msm_host->mmc;
>  	struct device *dev = mmc_dev(mmc);
> -	struct resource *res;
>  
>  	if (!(cqhci_readl(cq_host, CQHCI_CAP) & CQHCI_CAP_CS))
>  		return 0;
>  
> -	res = platform_get_resource_byname(msm_host->pdev, IORESOURCE_MEM,
> -					   "ice");
> -	if (!res) {
> -		dev_warn(dev, "ICE registers not found\n");
> -		goto disable;
> -	}
> -
> -	if (!qcom_scm_ice_available()) {
> -		dev_warn(dev, "ICE SCM interface not found\n");
> -		goto disable;
> +	msm_host->ice = of_qcom_ice_get(dev);
> +	if (msm_host->ice == ERR_PTR(-EOPNOTSUPP)) {
> +		dev_warn(dev, "Disabling inline encryption support\n");
> +		msm_host->ice = NULL;
>  	}
>  
> -	msm_host->ice_mem = devm_ioremap_resource(dev, res);
> -	if (IS_ERR(msm_host->ice_mem))
> -		return PTR_ERR(msm_host->ice_mem);
> -
> -	if (!sdhci_msm_ice_supported(msm_host))
> -		goto disable;
> +	if (IS_ERR(msm_host->ice))
> +		return PTR_ERR(msm_host->ice);
>  
>  	mmc->caps2 |= MMC_CAP2_CRYPTO;
> -	return 0;
>  
> -disable:
> -	dev_warn(dev, "Disabling inline encryption support\n");
>  	return 0;
>  }

This is sometimes setting MMC_CAP2_CRYPTO when ICE is unsupported.

BTW, it would be better to set not msm_host->ice until it's known that it will
have a valid value:

	ice = of_qcom_ice_get(dev);
	if (ice == ERR_PTR(-EOPNOTSUPP)) {
		dev_warn(dev, "Disabling inline encryption support\n");
		return 0;
	}
	if (IS_ERR_OR_NULL(ice))
		return PTR_ERR_OR_ZERO(ice);

	msm_host->ice = ice;
	mmc->caps2 |= MMC_CAP2_CRYPTO;
	return 0;

- Eric