linux-kernel - [PATCH v4 10/24] ASoC: renesas: rz-ssi: Use readl_poll_timeout

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Message-Id: <20241210170953.2936724-11-claudiu.beznea.uj@bp.renesas.com>
Date: Tue, 10 Dec 2024 19:09:39 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: geert+renesas@...der.be,
	mturquette@...libre.com,
	sboyd@...nel.org,
	robh+dt@...nel.org,
	lgirdwood@...il.com,
	broonie@...nel.org,
	magnus.damm@...il.com,
	perex@...ex.cz,
	tiwai@...e.com,
	p.zabel@...gutronix.de,
	biju.das.jz@...renesas.com
Cc: claudiu.beznea@...on.dev,
	linux-renesas-soc@...r.kernel.org,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH v4 10/24] ASoC: renesas: rz-ssi: Use readl_poll_timeout_atomic()

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Use readl_poll_timeout_atomic() instead of hardcoding something similar.
While at it replace dev_info() with dev_warn_ratelimited() as the
rz_ssi_set_idle() can also be called from IRQ context and if the SSI
idle is not properly set this is at least a warning for user.

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v4:
- collected tags

Changes in v3:
- s/sh/renesas in patch title

Changes in v2:
- none

 sound/soc/renesas/rz-ssi.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/sound/soc/renesas/rz-ssi.c b/sound/soc/renesas/rz-ssi.c
index 1a98f6b3e6a7..03d409d3070c 100644
--- a/sound/soc/renesas/rz-ssi.c
+++ b/sound/soc/renesas/rz-ssi.c
@@ -9,6 +9,7 @@
 #include <linux/clk.h>
 #include <linux/dmaengine.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
@@ -307,7 +308,8 @@ static int rz_ssi_clk_setup(struct rz_ssi_priv *ssi, unsigned int rate,
 
 static void rz_ssi_set_idle(struct rz_ssi_priv *ssi)
 {
-	int timeout;
+	u32 tmp;
+	int ret;
 
 	/* Disable irqs */
 	rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TUIEN | SSICR_TOIEN |
@@ -320,15 +322,9 @@ static void rz_ssi_set_idle(struct rz_ssi_priv *ssi)
 			      SSISR_RUIRQ), 0);
 
 	/* Wait for idle */
-	timeout = 100;
-	while (--timeout) {
-		if (rz_ssi_reg_readl(ssi, SSISR) & SSISR_IIRQ)
-			break;
-		udelay(1);
-	}
-
-	if (!timeout)
-		dev_info(ssi->dev, "timeout waiting for SSI idle\n");
+	ret = readl_poll_timeout_atomic(ssi->base + SSISR, tmp, (tmp & SSISR_IIRQ), 1, 100);
+	if (ret)
+		dev_warn_ratelimited(ssi->dev, "timeout waiting for SSI idle\n");
 
 	/* Hold FIFOs in reset */
 	rz_ssi_reg_mask_setl(ssi, SSIFCR, 0, SSIFCR_FIFO_RST);
-- 
2.39.2