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From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
To:     andersson@kernel.org
Cc:     mathieu.poirier@linaro.org, matthias.bgg@gmail.com,
        linux-remoteproc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        wenst@chromium.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
Subject: [PATCH 1/2] remoteproc/mtk_scp: Use readl_poll_timeout_atomic() for polling
Date:   Wed,  4 Jan 2023 12:53:40 +0100
Message-Id: <20230104115341.320951-2-angelogioacchino.delregno@collabora.com>
In-Reply-To: <20230104115341.320951-1-angelogioacchino.delregno@collabora.com>
References: <20230104115341.320951-1-angelogioacchino.delregno@collabora.com>
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Convert the usage of an open-coded custom tight poll while loop
with the provided readl_poll_timeout_atomic() macro.

This cleanup brings no functional change.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/remoteproc/mtk_scp_ipi.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/remoteproc/mtk_scp_ipi.c b/drivers/remoteproc/mtk_scp_ipi.c
index 4c0d121c2f54..af47504bdb61 100644
--- a/drivers/remoteproc/mtk_scp_ipi.c
+++ b/drivers/remoteproc/mtk_scp_ipi.c
@@ -6,13 +6,17 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/time64.h>
 #include <linux/remoteproc/mtk_scp.h>
 
 #include "mtk_common.h"
 
+#define SCP_TIMEOUT_US		(2000 * USEC_PER_MSEC)
+
 /**
  * scp_ipi_register() - register an ipi function
  *
@@ -157,6 +161,7 @@ int scp_ipi_send(struct mtk_scp *scp, u32 id, void *buf, unsigned int len,
 {
 	struct mtk_share_obj __iomem *send_obj = scp->send_buf;
 	unsigned long timeout;
+	u32 val;
 	int ret;
 
 	if (WARN_ON(id <= SCP_IPI_INIT) || WARN_ON(id >= SCP_IPI_MAX) ||
@@ -173,14 +178,12 @@ int scp_ipi_send(struct mtk_scp *scp, u32 id, void *buf, unsigned int len,
 	mutex_lock(&scp->send_lock);
 
 	 /* Wait until SCP receives the last command */
-	timeout = jiffies + msecs_to_jiffies(2000);
-	do {
-		if (time_after(jiffies, timeout)) {
-			dev_err(scp->dev, "%s: IPI timeout!\n", __func__);
-			ret = -ETIMEDOUT;
-			goto unlock_mutex;
-		}
-	} while (readl(scp->reg_base + scp->data->host_to_scp_reg));
+	ret = readl_poll_timeout_atomic(scp->reg_base + scp->data->host_to_scp_reg,
+					val, !val, 0, SCP_TIMEOUT_US);
+	if (ret) {
+		dev_err(scp->dev, "%s: IPI timeout!\n", __func__);
+		goto unlock_mutex;
+	}
 
 	scp_memcpy_aligned(send_obj->share_buf, buf, len);
 
-- 
2.39.0