summaryrefslogtreecommitdiff
path: root/sound/drivers/pcsp/pcsp_lib.c
diff options
context:
space:
mode:
authorIngo Molnar <mingo@elte.hu>2008-06-16 11:27:45 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-16 11:27:45 +0200
commitd939d2851fd12568e2eabb2916769e8a57ba5c89 (patch)
treef3158a5ddd41541a61126f9e48de1ce89c632f64 /sound/drivers/pcsp/pcsp_lib.c
parent9f5314fb4d556d3132c784d0df47352b2830ca53 (diff)
parent066519068ad2fbe98c7f45552b1f592903a9c8c8 (diff)
Merge branch 'linus' into x86/irqtip-x86-irq-2008-06-16_09.27_Mon
Diffstat (limited to 'sound/drivers/pcsp/pcsp_lib.c')
-rw-r--r--sound/drivers/pcsp/pcsp_lib.c58
1 files changed, 20 insertions, 38 deletions
diff --git a/sound/drivers/pcsp/pcsp_lib.c b/sound/drivers/pcsp/pcsp_lib.c
index ac6238e93513..e341f3f83b6a 100644
--- a/sound/drivers/pcsp/pcsp_lib.c
+++ b/sound/drivers/pcsp/pcsp_lib.c
@@ -9,7 +9,6 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <sound/pcm.h>
-#include <linux/interrupt.h>
#include <asm/io.h>
#include "pcsp.h"
@@ -18,36 +17,12 @@ module_param(nforce_wa, bool, 0444);
MODULE_PARM_DESC(nforce_wa, "Apply NForce chipset workaround "
"(expect bad sound)");
-static void pcsp_start_timer(unsigned long dummy)
-{
- hrtimer_start(&pcsp_chip.timer, ktime_set(0, 0), HRTIMER_MODE_REL);
-}
-
-/*
- * We need the hrtimer_start as a tasklet to avoid
- * the nasty locking problem. :(
- * The problem:
- * - The timer handler is called with the cpu_base->lock
- * already held by hrtimer code.
- * - snd_pcm_period_elapsed() takes the
- * substream->self_group.lock.
- * So far so good.
- * But the snd_pcsp_trigger() is called with the
- * substream->self_group.lock held, and it calls
- * hrtimer_start(), which takes the cpu_base->lock.
- * You see the problem. We have the code pathes
- * which take two locks in a reverse order. This
- * can deadlock and the lock validator complains.
- * The only solution I could find was to move the
- * hrtimer_start() into a tasklet. -stsp
- */
-static DECLARE_TASKLET(pcsp_start_timer_tasklet, pcsp_start_timer, 0);
+#define DMIX_WANTS_S16 1
enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
{
- unsigned long flags;
unsigned char timer_cnt, val;
- int periods_elapsed;
+ int fmt_size, periods_elapsed;
u64 ns;
size_t period_bytes, buffer_bytes;
struct snd_pcm_substream *substream;
@@ -64,9 +39,7 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
return HRTIMER_RESTART;
}
- /* hrtimer calls us from both hardirq and softirq contexts,
- * so irqsave :( */
- spin_lock_irqsave(&chip->substream_lock, flags);
+ spin_lock_irq(&chip->substream_lock);
/* Takashi Iwai says regarding this extra lock:
If the irq handler handles some data on the DMA buffer, it should
@@ -92,8 +65,11 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
goto exit_nr_unlock2;
runtime = substream->runtime;
- /* assume it is u8 mono */
- val = runtime->dma_area[chip->playback_ptr];
+ fmt_size = snd_pcm_format_physical_width(runtime->format) >> 3;
+ /* assume it is mono! */
+ val = runtime->dma_area[chip->playback_ptr + fmt_size - 1];
+ if (snd_pcm_format_signed(runtime->format))
+ val ^= 0x80;
timer_cnt = val * CUR_DIV() / 256;
if (timer_cnt && chip->enable) {
@@ -111,12 +87,14 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
period_bytes = snd_pcm_lib_period_bytes(substream);
buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
- chip->playback_ptr += PCSP_INDEX_INC();
+ chip->playback_ptr += PCSP_INDEX_INC() * fmt_size;
periods_elapsed = chip->playback_ptr - chip->period_ptr;
if (periods_elapsed < 0) {
- printk(KERN_WARNING "PCSP: playback_ptr inconsistent "
+#if PCSP_DEBUG
+ printk(KERN_INFO "PCSP: buffer_bytes mod period_bytes != 0 ? "
"(%zi %zi %zi)\n",
chip->playback_ptr, period_bytes, buffer_bytes);
+#endif
periods_elapsed += buffer_bytes;
}
periods_elapsed /= period_bytes;
@@ -132,7 +110,7 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
chip->period_ptr %= buffer_bytes;
}
- spin_unlock_irqrestore(&chip->substream_lock, flags);
+ spin_unlock_irq(&chip->substream_lock);
if (!atomic_read(&chip->timer_active))
return HRTIMER_NORESTART;
@@ -146,7 +124,7 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
exit_nr_unlock2:
snd_pcm_stream_unlock(substream);
exit_nr_unlock1:
- spin_unlock_irqrestore(&chip->substream_lock, flags);
+ spin_unlock_irq(&chip->substream_lock);
return HRTIMER_NORESTART;
}
@@ -167,7 +145,7 @@ static void pcsp_start_playing(struct snd_pcsp *chip)
atomic_set(&chip->timer_active, 1);
chip->thalf = 0;
- tasklet_schedule(&pcsp_start_timer_tasklet);
+ hrtimer_start(&pcsp_chip.timer, ktime_set(0, 0), HRTIMER_MODE_REL);
}
static void pcsp_stop_playing(struct snd_pcsp *chip)
@@ -270,7 +248,11 @@ static struct snd_pcm_hardware snd_pcsp_playback = {
.info = (SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_HALF_DUPLEX |
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
- .formats = SNDRV_PCM_FMTBIT_U8,
+ .formats = (SNDRV_PCM_FMTBIT_U8
+#if DMIX_WANTS_S16
+ | SNDRV_PCM_FMTBIT_S16_LE
+#endif
+ ),
.rates = SNDRV_PCM_RATE_KNOT,
.rate_min = PCSP_DEFAULT_SRATE,
.rate_max = PCSP_DEFAULT_SRATE,