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

Eric Biggers
2023-03-27T18:32:20Z

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@linaro.org>
> ---
>
> The v3 (RFC) is here:
> https://lore.kernel.org/all/20230313115202.3960700-7-abel.vesa@linaro.org/
>
> 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