Re: [PATCH v5 2/4] mmc: sdhci-msm: Reprogram crypto keys during host hardware initialization

[Eric Biggers <ebiggers@kernel.org>]

On Thu, Jul 30, 2026 at 07:38:20PM +0530, Neeraj Soni wrote:
> Host looses the Inline Crypto Engine (ICE) keys during hardware reset.
> Re-program the keys while intializing ICE to ensure that ICE is available
> in the same state as before the hardware reset.
> 
> Also set MMC_CAP2_CRYPTO_NO_REPROG to indicate that re-program of ICE keys
> is not needed during MMC runtime suspend/resume.
> 
> Signed-off-by: Seshu Madhavi Puppala <quic_spuppala@quicinc.com>
> Co-developed-by: Ram Prakash Gupta <quic_rampraka@quicinc.com>
> Signed-off-by: Ram Prakash Gupta <quic_rampraka@quicinc.com>
> Co-developed-by: Sarthak Garg <quic_sartgarg@quicinc.com>
> Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com>
> Signed-off-by: Debraj Mukhopadhyay <quic_dmukhopa@quicinc.com>
> Signed-off-by: Neeraj Soni <neeraj.soni@oss.qualcomm.com>
> ---
>  drivers/mmc/host/sdhci-msm.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 4aff965f0e2e..7d71dc6f388d 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -1958,7 +1958,10 @@ static int sdhci_msm_ice_init(struct sdhci_msm_host *msm_host,
>  				cap.sdus_mask * 512;
>  	}
>  
> +	blk_crypto_reprogram_all_keys(&mmc->crypto_profile);
> +

This still does nothing.  The crypto profile was just initialized, so no
keyslots are in-use and blk_crypto_reprogram_all_keys() does nothing.

>  	mmc->caps2 |= MMC_CAP2_CRYPTO;
> +	mmc->caps2 |= MMC_CAP2_CRYPTO_NO_REPROG;

This seems to be the actual point of the patch, so let's simplify it to
just this.  However, this is also broken because this is ordered before
patch 3 that introduces the actually functional key reprogramming.
Please drop the no-op call to blk_crypto_reprogram_all_keys(), then
merge patches 2 and 3 into a single one.

- Eric