X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=sound%2Fpci%2Fes1968.c;h=1bf298d214b90462cfe7b5253c7d4d0f6c097fd1;hb=b17b3d479c4c43c3a980ee553c3be3ca456523de;hp=67f03264f871988fd68d12d55a0fce385f4b2d2d;hpb=3463d8fa14ba2e00ede9894efdaa65189eb04b36;p=linux-2.6

diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
index 67f03264f8..1bf298d214 100644
--- a/sound/pci/es1968.c
+++ b/sound/pci/es1968.c
@@ -1827,6 +1827,22 @@ 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 +1964,11 @@ 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) {
@@ -2456,7 +2475,8 @@ static inline void snd_es1968_free_gameport(struct es1968 *chip) { }
 static int snd_es1968_free(struct es1968 *chip)
 {
 	if (chip->io_port) {
-		synchronize_irq(chip->irq);
+		if (chip->irq >= 0)
+			synchronize_irq(chip->irq);
 		outw(1, chip->io_port + 0x04); /* clear WP interrupts */
 		outw(0, chip->io_port + ESM_PORT_HOST_IRQ); /* disable IRQ */
 	}