[PATCH 3/6] scsi: ufs: core: Add UFSHCD_QUIRK_BROKEN_CRYPTO_ENABLE

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

Add UFSHCD_QUIRK_BROKEN_CRYPTO_ENABLE which tells the UFS core to not
use the crypto enable bit defined by the UFS specification.  This is
needed to support inline encryption on the "Exynos" UFS controller.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 drivers/ufs/core/ufshcd-crypto.c | 8 ++++++++
 include/ufs/ufshcd.h             | 7 +++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/ufs/core/ufshcd-crypto.c b/drivers/ufs/core/ufshcd-crypto.c
index b4980fd91cee..a714dad82cd1 100644
--- a/drivers/ufs/core/ufshcd-crypto.c
+++ b/drivers/ufs/core/ufshcd-crypto.c
@@ -108,17 +108,25 @@ static int ufshcd_crypto_keyslot_evict(struct blk_crypto_profile *profile,
 	union ufs_crypto_cfg_entry cfg = {};
 
 	return ufshcd_program_key(hba, &cfg, slot);
 }
 
+/*
+ * Reprogram the keyslots if needed, and return true if CRYPTO_GENERAL_ENABLE
+ * should be used in the host controller initialization sequence.
+ */
 bool ufshcd_crypto_enable(struct ufs_hba *hba)
 {
 	if (!(hba->caps & UFSHCD_CAP_CRYPTO))
 		return false;
 
 	/* Reset might clear all keys, so reprogram all the keys. */
 	blk_crypto_reprogram_all_keys(&hba->crypto_profile);
+
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_CRYPTO_ENABLE)
+		return false;
+
 	return true;
 }
 
 static const struct blk_crypto_ll_ops ufshcd_crypto_ops = {
 	.keyslot_program	= ufshcd_crypto_keyslot_program,
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index b354a7eee478..4b7ad23a4420 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -650,10 +650,17 @@ enum ufshcd_quirks {
 	 * nonstandard way and/or needs to override blk_crypto_ll_ops.  If
 	 * enabled, the standard code won't initialize the blk_crypto_profile;
 	 * ufs_hba_variant_ops::init() must do it instead.
 	 */
 	UFSHCD_QUIRK_CUSTOM_CRYPTO_PROFILE		= 1 << 22,
+
+	/*
+	 * This quirk needs to be enabled if the host controller supports inline
+	 * encryption but does not support the CRYPTO_GENERAL_ENABLE bit, i.e.
+	 * host controller initialization fails if that bit is set.
+	 */
+	UFSHCD_QUIRK_BROKEN_CRYPTO_ENABLE		= 1 << 23,
 };
 
 enum ufshcd_caps {
 	/* Allow dynamic clk gating */
 	UFSHCD_CAP_CLK_GATING				= 1 << 0,
-- 
2.45.2