linux-kernel - [PATCH 3/3] soundwire: cadence: revisit parity injection

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Date:   Thu, 18 May 2023 10:41:19 +0800
From:   Bard Liao <yung-chuan.liao@...ux.intel.com>
To:     alsa-devel@...a-project.org, vkoul@...nel.org
Cc:     vinod.koul@...aro.org, linux-kernel@...r.kernel.org,
        pierre-louis.bossart@...ux.intel.com, bard.liao@...el.com
Subject: [PATCH 3/3] soundwire: cadence: revisit parity injection

From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

We want to wait for the CONFIG_UPDATE bit to clear before doing
something else.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Rander Wang <rander.wang@...el.com>
Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
---
 drivers/soundwire/cadence_master.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index 58686ae50bbf..0efc1c3bee5f 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -456,9 +456,9 @@ static int cdns_parity_error_injection(void *data, u64 value)
 			CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR);
 
 	/* commit changes */
-	cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
-		     CDNS_MCP_CONFIG_UPDATE_BIT,
-		     CDNS_MCP_CONFIG_UPDATE_BIT);
+	ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
+	if (ret < 0)
+		goto unlock;
 
 	/* do a broadcast dummy read to avoid bus clashes */
 	ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0);
@@ -470,16 +470,17 @@ static int cdns_parity_error_injection(void *data, u64 value)
 			0);
 
 	/* commit changes */
-	cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
-		     CDNS_MCP_CONFIG_UPDATE_BIT,
-		     CDNS_MCP_CONFIG_UPDATE_BIT);
+	ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
+	if (ret < 0)
+		goto unlock;
 
+	/* Userspace changed the hardware state behind the kernel's back */
+	add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+
+unlock:
 	/* Continue bus operation with parity error injection disabled */
 	mutex_unlock(&bus->bus_lock);
 
-	/* Userspace changed the hardware state behind the kernel's back */
-	add_taint(TAINT_USER, LOCKDEP_STILL_OK);
-
 	/*
 	 * allow Master device to enter pm_runtime suspend. This may
 	 * also result in Slave devices suspending.
-- 
2.25.1