linux-kernel - [PATCH v2 2/2] soc: qcom: rpmh-rsc: Timeout after 1 second in write_tcs_reg

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Date:   Tue, 14 Apr 2020 13:10:16 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     mkshah@...eaurora.org, joe@...ches.com, swboyd@...omium.org,
        mka@...omium.org, evgreen@...omium.org,
        Douglas Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] soc: qcom: rpmh-rsc: Timeout after 1 second in write_tcs_reg_sync()

If our data still isn't there after 1 second, shout and give up.

Reported-by: Joe Perches <joe@...ches.com>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v2:
- Patch ("Timeout after 1 second") new for v2.

 drivers/soc/qcom/rpmh-rsc.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index f988e9cc2c30..02fc114ffb4f 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -10,6 +10,7 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/of.h>
@@ -174,12 +175,13 @@ static void write_tcs_reg(const struct rsc_drv *drv, int reg, int tcs_id,
 static void write_tcs_reg_sync(const struct rsc_drv *drv, int reg, int tcs_id,
 			       u32 data)
 {
+	u32 new_data;
+
 	writel(data, tcs_reg_addr(drv, reg, tcs_id));
-	for (;;) {
-		if (data == readl(tcs_reg_addr(drv, reg, tcs_id)))
-			break;
-		udelay(1);
-	}
+	if (readl_poll_timeout_atomic(tcs_reg_addr(drv, reg, tcs_id), new_data,
+				      new_data == data, 1, USEC_PER_SEC))
+		pr_err("%s: error writing %#x to %d:%d\n", drv->name,
+		       data, tcs_id, reg);
 }
 
 /**
-- 
2.26.0.110.g2183baf09c-goog