ALSA: pcsp - Fix nforce workaround

The attached patch fixes the problems introduced in this commit:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=eea0579fc85e64e9f05361d5aacf496fe7a151aa

- Fix nForce workaround by honouring the pointer_update var
- Revert "ns" to u64, as per the hrtimer API
- Revert to the zero-delay timer startup, since I can't reproduce any
  problem with it (please, give me the hint!)
Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/pcsp/pcsp_lib.c

@@ -39,25 +39,20 @@ static DECLARE_TASKLET(pcsp_pcm_tasklet, pcsp_call_pcm_elapsed, 0);
 /* write the port and returns the next expire time in ns;
  * called at the trigger-start and in hrtimer callback
  */
-static unsigned long pcsp_timer_update(struct hrtimer *handle)
+static u64 pcsp_timer_update(struct snd_pcsp *chip)
 {
 	unsigned char timer_cnt, val;
 	u64 ns;
 	struct snd_pcm_substream *substream;
 	struct snd_pcm_runtime *runtime;
-	struct snd_pcsp *chip = container_of(handle, struct snd_pcsp, timer);
 	unsigned long flags;
 
 	if (chip->thalf) {
 		outb(chip->val61, 0x61);
 		chip->thalf = 0;
-		if (!atomic_read(&chip->timer_active))
-			return 0;
 		return chip->ns_rem;
 	}
 
-	if (!atomic_read(&chip->timer_active))
-		return 0;
 	substream = chip->playback_substream;
 	if (!substream)
 		return 0;
@@ -88,24 +83,17 @@ static unsigned long pcsp_timer_update(struct hrtimer *handle)
 	return ns;
 }
 
-enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
+static void pcsp_pointer_update(struct snd_pcsp *chip)
 {
-	struct snd_pcsp *chip = container_of(handle, struct snd_pcsp, timer);
 	struct snd_pcm_substream *substream;
-	int periods_elapsed, pointer_update;
 	size_t period_bytes, buffer_bytes;
-	unsigned long ns;
+	int periods_elapsed;
 	unsigned long flags;
 
-	pointer_update = !chip->thalf;
-	ns = pcsp_timer_update(handle);
-	if (!ns)
-		return HRTIMER_NORESTART;
-
 	/* update the playback position */
 	substream = chip->playback_substream;
 	if (!substream)
-		return HRTIMER_NORESTART;
+		return;
 
 	period_bytes = snd_pcm_lib_period_bytes(substream);
 	buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
@@ -134,6 +122,26 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
 
 	if (periods_elapsed)
 		tasklet_schedule(&pcsp_pcm_tasklet);
+}
+
+enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
+{
+	struct snd_pcsp *chip = container_of(handle, struct snd_pcsp, timer);
+	int pointer_update;
+	u64 ns;
+
+	if (!atomic_read(&chip->timer_active) || !chip->playback_substream)
+		return HRTIMER_NORESTART;
+
+	pointer_update = !chip->thalf;
+	ns = pcsp_timer_update(chip);
+	if (!ns) {
+		printk(KERN_WARNING "PCSP: unexpected stop\n");
+		return HRTIMER_NORESTART;
+	}
+
+	if (pointer_update)
+		pcsp_pointer_update(chip);
 
 	hrtimer_forward(handle, hrtimer_get_expires(handle), ns_to_ktime(ns));
 
@@ -142,8 +150,6 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
 
 static int pcsp_start_playing(struct snd_pcsp *chip)
 {
-	unsigned long ns;
-
 #if PCSP_DEBUG
 	printk(KERN_INFO "PCSP: start_playing called\n");
 #endif
@@ -159,11 +165,7 @@ static int pcsp_start_playing(struct snd_pcsp *chip)
 	atomic_set(&chip->timer_active, 1);
 	chip->thalf = 0;
 
-	ns = pcsp_timer_update(&pcsp_chip.timer);
-	if (!ns)
-		return -EIO;
-
-	hrtimer_start(&pcsp_chip.timer, ktime_set(0, ns), HRTIMER_MODE_REL);
+	hrtimer_start(&pcsp_chip.timer, ktime_set(0, 0), HRTIMER_MODE_REL);
 	return 0;
 }
 
@@ -232,21 +234,22 @@ static int snd_pcsp_playback_hw_free(struct snd_pcm_substream *substream)
 static int snd_pcsp_playback_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
+	pcsp_sync_stop(chip);
+	chip->playback_ptr = 0;
+	chip->period_ptr = 0;
+	chip->fmt_size =
+		snd_pcm_format_physical_width(substream->runtime->format) >> 3;
+	chip->is_signed = snd_pcm_format_signed(substream->runtime->format);
 #if PCSP_DEBUG
 	printk(KERN_INFO "PCSP: prepare called, "
-			"size=%zi psize=%zi f=%zi f1=%i\n",
+			"size=%zi psize=%zi f=%zi f1=%i fsize=%i\n",
 			snd_pcm_lib_buffer_bytes(substream),
 			snd_pcm_lib_period_bytes(substream),
 			snd_pcm_lib_buffer_bytes(substream) /
 			snd_pcm_lib_period_bytes(substream),
-			substream->runtime->periods);
+			substream->runtime->periods,
+			chip->fmt_size);
 #endif
-	pcsp_sync_stop(chip);
-	chip->playback_ptr = 0;
-	chip->period_ptr = 0;
-	chip->fmt_size =
-		snd_pcm_format_physical_width(substream->runtime->format) >> 3;
-	chip->is_signed = snd_pcm_format_signed(substream->runtime->format);
 	return 0;
 }
 

sound/drivers/pcsp/pcsp_mixer.c

@@ -72,7 +72,7 @@ static int pcsp_treble_put(struct snd_kcontrol *kcontrol,
 	if (treble != chip->treble) {
 		chip->treble = treble;
 #if PCSP_DEBUG
-		printk(KERN_INFO "PCSP: rate set to %i\n", PCSP_RATE());
+		printk(KERN_INFO "PCSP: rate set to %li\n", PCSP_RATE());
 #endif
 		changed = 1;
 	}