linux-kernel - [PATCH 1/4] remoteproc: qcom: q6v5-mss: Use regmap_read_poll

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Message-Id: <20200117135130.3605-2-sibis@codeaurora.org>
Date:   Fri, 17 Jan 2020 19:21:27 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     bjorn.andersson@...aro.org, evgreen@...omium.org,
        p.zabel@...gutronix.de
Cc:     ohad@...ery.com, linux-arm-msm@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        agross@...nel.org, Sibi Sankar <sibis@...eaurora.org>
Subject: [PATCH 1/4] remoteproc: qcom: q6v5-mss: Use regmap_read_poll_timeout

Replace the loop for HALT_ACK detection with regmap_read_poll_timeout.

Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
---
 drivers/remoteproc/qcom_q6v5_mss.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index 51f451311f5fc..f20b39c6ff0ed 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -73,6 +73,7 @@
 #define NAV_AXI_IDLE_BIT		BIT(2)
 
 #define HALT_ACK_TIMEOUT_MS		100
+#define NAV_HALT_ACK_TIMEOUT_US		200
 
 /* QDSP6SS_RESET */
 #define Q6SS_STOP_CORE			BIT(0)
@@ -746,7 +747,6 @@ static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
 				       struct regmap *halt_map,
 				       u32 offset)
 {
-	unsigned long timeout;
 	unsigned int val;
 	int ret;
 
@@ -760,15 +760,11 @@ static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
 			   NAV_AXI_HALTREQ_BIT);
 
 	/* Wait for halt ack*/
-	timeout = jiffies + msecs_to_jiffies(HALT_ACK_TIMEOUT_MS);
-	for (;;) {
-		ret = regmap_read(halt_map, offset, &val);
-		if (ret || (val & NAV_AXI_HALTACK_BIT) ||
-		    time_after(jiffies, timeout))
-			break;
-
-		udelay(5);
-	}
+	ret = regmap_read_poll_timeout(halt_map, offset, val,
+				       (val & NAV_AXI_HALTACK_BIT),
+				       5, NAV_HALT_ACK_TIMEOUT_US);
+	if (ret)
+		dev_err(qproc->dev, "nav halt ack timeout\n");
 
 	ret = regmap_read(halt_map, offset, &val);
 	if (ret || !(val & NAV_AXI_IDLE_BIT))
-- 
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