Re: [PATCH v4 6/7] mmc: sdhci-msm: Switch to the new ICE API

[Eric Biggers]

On Mon, Mar 27, 2023 at 04:47:33PM +0300, Abel Vesa wrote:
> Now that there is a new dedicated ICE driver, drop the sdhci-msm ICE
> implementation and use the new ICE api provided by the Qualcomm soc
> driver ice. The platforms that already have ICE support will use the
> API as library since there will not be a devicetree node, but instead
> they have reg range. In this case, the of_qcom_ice_get will return an
> ICE instance created for the consumer's device. But if there are
> platforms that do not have ice reg in the consumer devicetree node
> and instead provide a dedicated ICE devicetree node, theof_qcom_ice_get
> will look up the device based on qcom,ice property and will get the ICE
> instance registered by the probe function of the ice driver.
> 
> Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
> ---
> 
> The v3 (RFC) is here:
> https://lore.kernel.org/all/20230313115202.3960700-7-abel.vesa@xxxxxxxxxx/
> 
> Changes since v3:
>  * added back the checks for and the setting of MMC_CAP2_CRYPTO 
>  * added enable/resume/suspend implementation for !CONFIG_MMC_CRYPTO
>  * dropped cfg->crypto_cap_idx argument from qcom_ice_program_key
> 
> Changes since v2:
>  * added the suspend API call for ICE
>  * kept old wrappers over ICE API in
> 
> Changes since v1:
>  * Added a check for supported algorithm and key size
>    and passed the ICE defined values for algorithm and key size
>  * Added call to evict function
> 
>  drivers/mmc/host/Kconfig     |   2 +-
>  drivers/mmc/host/sdhci-msm.c | 220 +++++++----------------------------
>  2 files changed, 46 insertions(+), 176 deletions(-)
> 
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 4745fe217ade..09f837df5435 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -549,7 +549,7 @@ config MMC_SDHCI_MSM
>  	depends on MMC_SDHCI_PLTFM
>  	select MMC_SDHCI_IO_ACCESSORS
>  	select MMC_CQHCI
> -	select QCOM_SCM if MMC_CRYPTO
> +	select QCOM_INLINE_CRYPTO_ENGINE if MMC_CRYPTO
>  	help
>  	  This selects the Secure Digital Host Controller Interface (SDHCI)
>  	  support present in Qualcomm SOCs. The controller supports
> 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/pinctrl/consumer.h>
>  #include <linux/reset.h>
>  
> +#include <soc/qcom/ice.h>
> +
>  #include "sdhci-cqhci.h"
>  #include "sdhci-pltfm.h"
>  #include "cqhci.h"
> @@ -258,12 +260,14 @@ struct sdhci_msm_variant_info {
>  struct sdhci_msm_host {
>  	struct platform_device *pdev;
>  	void __iomem *core_mem;	/* MSM SDCC mapped address */
> -	void __iomem *ice_mem;	/* MSM ICE mapped address (if available) */
>  	int pwr_irq;		/* power irq */
>  	struct clk *bus_clk;	/* SDHC bus voter clock */
>  	struct clk *xo_clk;	/* TCXO clk needed for FLL feature of cm_dll*/
> -	/* core, iface, cal, sleep, and ice clocks */
> -	struct clk_bulk_data bulk_clks[5];
> +	/* core, iface, cal and sleep clocks */
> +	struct clk_bulk_data bulk_clks[4];
> +#ifdef CONFIG_MMC_CRYPTO
> +	struct qcom_ice *ice;
> +#endif

Similarly to the UFS patch, it is not clear that the calls to
clk_prepare_enable() and clk_disable_unprepare() on the ICE clock are paired up
anymore, with qcom_ice_enable() in particular seeming to be unpaired.  Perhaps
it should continue to be enabled / disabled at the same time as the other host
controller clocks are enabled / disabled?

Also, are you sure that the ICE clock is actually being found?
drivers/soc/qcom/ice.c does:

        engine->core_clk = devm_clk_get(dev, NULL);
        if (IS_ERR(engine->core_clk))
                return ERR_CAST(engine->core_clk);

It is not clear how that can get the clock named "ice" from the device tree.

- Eric