drm/bridge: it6505: Use SHA-1 library instead of crypto_shash

Instead of using the "sha1" crypto_shash, simply call the sha1() library
function.  This is simpler and faster.

Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://patch.msgid.link/20250821175613.14717-1-ebiggers@kernel.org
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>

Author: Eric Biggers

drivers/gpu/drm/bridge/Kconfig

@@ -120,8 +120,7 @@ config DRM_ITE_IT6505
 	select DRM_DISPLAY_DP_AUX_BUS
 	select DRM_KMS_HELPER
 	select EXTCON
-	select CRYPTO
-	select CRYPTO_HASH
+	select CRYPTO_LIB_SHA1
 	select REGMAP_I2C
 	help
 	  ITE IT6505 DisplayPort bridge chip driver.

drivers/gpu/drm/bridge/ite-it6505.c

@@ -21,7 +21,7 @@
 #include <linux/wait.h>
 #include <linux/bitfield.h>
 
-#include <crypto/hash.h>
+#include <crypto/sha1.h>
 
 #include <drm/display/drm_dp_helper.h>
 #include <drm/display/drm_hdcp_helper.h>
@@ -2107,35 +2107,6 @@ static void it6505_hdcp_part1_auth(struct it6505 *it6505)
 	it6505->hdcp_status = HDCP_AUTH_GOING;
 }
 
-static int it6505_sha1_digest(struct it6505 *it6505, u8 *sha1_input,
-			      unsigned int size, u8 *output_av)
-{
-	struct shash_desc *desc;
-	struct crypto_shash *tfm;
-	int err;
-	struct device *dev = it6505->dev;
-
-	tfm = crypto_alloc_shash("sha1", 0, 0);
-	if (IS_ERR(tfm)) {
-		dev_err(dev, "crypto_alloc_shash sha1 failed");
-		return PTR_ERR(tfm);
-	}
-	desc = kzalloc(sizeof(*desc) + crypto_shash_descsize(tfm), GFP_KERNEL);
-	if (!desc) {
-		crypto_free_shash(tfm);
-		return -ENOMEM;
-	}
-
-	desc->tfm = tfm;
-	err = crypto_shash_digest(desc, sha1_input, size, output_av);
-	if (err)
-		dev_err(dev, "crypto_shash_digest sha1 failed");
-
-	crypto_free_shash(tfm);
-	kfree(desc);
-	return err;
-}
-
 static int it6505_setup_sha1_input(struct it6505 *it6505, u8 *sha1_input)
 {
 	struct device *dev = it6505->dev;
@@ -2205,7 +2176,7 @@ static bool it6505_hdcp_part2_ksvlist_check(struct it6505 *it6505)
 		return false;
 	}
 
-	it6505_sha1_digest(it6505, it6505->sha1_input, i, (u8 *)av);
+	sha1(it6505->sha1_input, i, (u8 *)av);
 	/*1B-05 V' must retry 3 times */
 	for (retry = 0; retry < 3; retry++) {
 		err = it6505_get_dpcd(it6505, DP_AUX_HDCP_V_PRIME(0), (u8 *)bv,