linux-kernel - [PATCH v8 1/6] crypto: ccp: Drop extra doorbell checks

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Date:   Mon, 3 Apr 2023 13:32:10 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        Tom Lendacky <thomas.lendacky@....com>,
        John Allen <john.allen@....com>
CC:     Held Felix <Felix.Held@....com>, <linux-kernel@...r.kernel.org>,
        <linux-i2c@...r.kernel.org>, Mark Hasemeyer <markhas@...omium.org>,
        "Grzegorz Bernacki" <gjb@...ihalf.com>,
        Jan Dąbroś <jsd@...ihalf.com>,
        Mario Limonciello <mario.limonciello@....com>,
        "David S. Miller" <davem@...emloft.net>,
        <linux-crypto@...r.kernel.org>
Subject: [PATCH v8 1/6] crypto: ccp: Drop extra doorbell checks

The doorbell register set used for I2C arbitration is dedicated for this
purpose and there is no need to utilize other safety checks the platform
access register set uses.

Suggested-by: Mark Hasemeyer <markhas@...omium.org>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Reviewed-by: Mark Hasemeyer <markhas@...omium.org>
Tested-by: Mark Hasemeyer <markhas@...omium.org>
---
 drivers/crypto/ccp/platform-access.c | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/drivers/crypto/ccp/platform-access.c b/drivers/crypto/ccp/platform-access.c
index b51fb1196932..1ad3a0a512b1 100644
--- a/drivers/crypto/ccp/platform-access.c
+++ b/drivers/crypto/ccp/platform-access.c
@@ -20,14 +20,6 @@
 
 #define PSP_CMD_TIMEOUT_US	(500 * USEC_PER_MSEC)
 
-/* Doorbell shouldn't be ringing */
-static int check_doorbell(u32 __iomem *doorbell)
-{
-	u32 tmp;
-
-	return readl_poll_timeout(doorbell, tmp, tmp != 0, 0, PSP_CMD_TIMEOUT_US);
-}
-
 /* Recovery field should be equal 0 to start sending commands */
 static int check_recovery(u32 __iomem *cmd)
 {
@@ -156,18 +148,6 @@ int psp_ring_platform_doorbell(int msg)
 
 	mutex_lock(&pa_dev->doorbell_mutex);
 
-	if (check_doorbell(button)) {
-		dev_dbg(psp->dev, "doorbell is not ready\n");
-		ret = -EBUSY;
-		goto unlock;
-	}
-
-	if (check_recovery(cmd)) {
-		dev_dbg(psp->dev, "doorbell command in recovery\n");
-		ret = -EBUSY;
-		goto unlock;
-	}
-
 	if (wait_cmd(cmd)) {
 		dev_dbg(psp->dev, "doorbell command not done processing\n");
 		ret = -EBUSY;
-- 
2.34.1