---

yaml
---
r: 92191
b: refs/heads/master
c: f24bfa5
h: refs/heads/master
i:
  92189: f624b6e
  92187: 7c35d78
  92183: fed1b3b
  92175: 2fc4fb0
  92159: 1c9e807
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 62cef8212ffa9df3e6c5b358ea2382d90489d590
+refs/heads/master: f24bfa53dab478e1bde2d7fd39d3c1a69dc518f1

trunk/sound/pci/es1968.c

@@ -1827,6 +1827,23 @@ snd_es1968_pcm(struct es1968 *chip, int device)
 
 	return 0;
 }
+/*
+ * suppress jitter on some maestros when playing stereo
+ */
+static void snd_es1968_suppress_jitter(struct es1968 *chip, struct esschan *es)
+{
+	unsigned int cp1;
+	unsigned int cp2;
+	unsigned int diff;
+
+	cp1 = __apu_get_register(chip, 0, 5);
+	cp2 = __apu_get_register(chip, 1, 5);
+	diff = (cp1 > cp2 ? cp1 - cp2 : cp2 - cp1);
+
+	if (diff > 1) {
+		__maestro_write(chip, IDR0_DATA_PORT, cp1);
+	}
+}
 
 /*
  * update pointer
@@ -1948,8 +1965,11 @@ static irqreturn_t snd_es1968_interrupt(int irq, void *dev_id)
 		struct esschan *es;
 		spin_lock(&chip->substream_lock);
 		list_for_each_entry(es, &chip->substream_list, list) {
-			if (es->running)
+			if (es->running) {
 				snd_es1968_update_pcm(chip, es);
+				if (es->fmt & ESS_FMT_STEREO)
+					snd_es1968_suppress_jitter(chip, es);
+			}
 		}
 		spin_unlock(&chip->substream_lock);
 		if (chip->in_measurement) {