linux-kernel - [PATCH v2 08/17] soundwire: cadence: merge routines to clear/set bits

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200317163329.25501-9-pierre-louis.bossart@linux.intel.com>
Date:   Tue, 17 Mar 2020 11:33:20 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, tiwai@...e.de, broonie@...nel.org,
        vkoul@...nel.org, gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Hui Wang <hui.wang@...onical.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: [PATCH v2 08/17] soundwire: cadence: merge routines to clear/set bits

Use a single loop to wait for hardware to set/clear fields.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
---
 drivers/soundwire/cadence_master.c | 28 ++++++++--------------------
 1 file changed, 8 insertions(+), 20 deletions(-)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index 613c63359413..7d9fc2c645e3 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -211,26 +211,6 @@ static inline void cdns_updatel(struct sdw_cdns *cdns,
 	cdns_writel(cdns, offset, tmp);
 }
 
-static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
-{
-	int timeout = 10;
-	u32 reg_read;
-
-	writel(value, cdns->registers + offset);
-
-	/* Wait for bit to be self cleared */
-	do {
-		reg_read = readl(cdns->registers + offset);
-		if ((reg_read & value) == 0)
-			return 0;
-
-		timeout--;
-		udelay(50);
-	} while (timeout != 0);
-
-	return -EAGAIN;
-}
-
 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
 {
 	int timeout = 10;
@@ -249,6 +229,14 @@ static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
 	return -ETIMEDOUT;
 }
 
+static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
+{
+	writel(value, cdns->registers + offset);
+
+	/* Wait for bit to be self cleared */
+	return cdns_set_wait(cdns, offset, value, 0);
+}
+
 /*
  * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
  * need to be confirmed with a write to MCP_CONFIG_UPDATE
-- 
2.20.1