releases/3.12.7/asoc-wm_adsp-add-small-delay-while-polling-dsp-ram-start.patch

From 939fd1e8d9deff206f12bd9d4e54aa7a4bd0ffd6 Mon Sep 17 00:00:00 2001
From: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Date: Wed, 18 Dec 2013 09:25:49 +0000
Subject: ASoC: wm_adsp: Add small delay while polling DSP RAM start

From: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>

commit 939fd1e8d9deff206f12bd9d4e54aa7a4bd0ffd6 upstream.

Some devices are getting very close to the limit whilst polling the RAM
start, this patch adds a small delay to this loop to give a longer
startup timeout.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/soc/codecs/wm_adsp.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -1466,13 +1466,17 @@ static int wm_adsp2_ena(struct wm_adsp *
 		return ret;
 
 	/* Wait for the RAM to start, should be near instantaneous */
-	count = 0;
-	do {
+	for (count = 0; count < 10; ++count) {
 		ret = regmap_read(dsp->regmap, dsp->base + ADSP2_STATUS1,
 				  &val);
 		if (ret != 0)
 			return ret;
-	} while (!(val & ADSP2_RAM_RDY) && ++count < 10);
+
+		if (val & ADSP2_RAM_RDY)
+			break;
+
+		msleep(1);
+	}
 
 	if (!(val & ADSP2_RAM_RDY)) {
 		adsp_err(dsp, "Failed to start DSP RAM\n");