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From af3ae835c6da0f3383aac9957df02f7160c9d2b4 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Fri, 29 Apr 2016 17:27:37 +0100
Subject: [PATCH] Revert "bcm2835: interpolate audio delay"
This reverts commit 83eca613d0eddd2c8299f114b8fe573ccaffdefc.
---
sound/arm/bcm2835-pcm.c | 12 +-----------
sound/arm/bcm2835.h | 1 -
2 files changed, 1 insertion(+), 12 deletions(-)
--- a/sound/arm/bcm2835-pcm.c
+++ b/sound/arm/bcm2835-pcm.c
@@ -25,7 +25,7 @@
/* hardware definition */
static struct snd_pcm_hardware snd_bcm2835_playback_hw = {
.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
- SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_BATCH),
+ SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
.formats = SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
.rate_min = 8000,
@@ -99,8 +99,6 @@ static irqreturn_t bcm2835_playback_fifo
alsa_stream->pos %= alsa_stream->buffer_size;
}
- alsa_stream->interpolate_start = ktime_get_ns();
-
if (alsa_stream->substream) {
if (new_period)
snd_pcm_period_elapsed(alsa_stream->substream);
@@ -401,7 +399,6 @@ static int snd_bcm2835_pcm_prepare(struc
alsa_stream->buffer_size = snd_pcm_lib_buffer_bytes(substream);
alsa_stream->period_size = snd_pcm_lib_period_bytes(substream);
alsa_stream->pos = 0;
- alsa_stream->interpolate_start = ktime_get_ns();
audio_debug("buffer_size=%d, period_size=%d pos=%d frame_bits=%d\n",
alsa_stream->buffer_size, alsa_stream->period_size,
@@ -498,7 +495,6 @@ snd_bcm2835_pcm_pointer(struct snd_pcm_s
{
struct snd_pcm_runtime *runtime = substream->runtime;
bcm2835_alsa_stream_t *alsa_stream = runtime->private_data;
- u64 now = ktime_get_ns();
audio_info(" .. IN\n");
@@ -507,12 +503,6 @@ snd_bcm2835_pcm_pointer(struct snd_pcm_s
frames_to_bytes(runtime, runtime->control->appl_ptr),
alsa_stream->pos);
- /* Give userspace better delay reporting by interpolating between GPU
- * notifications, assuming audio speed is close enough to the clock
- * used for ktime */
- if (alsa_stream->interpolate_start && alsa_stream->interpolate_start < now)
- runtime->delay = -(int)div_u64((now - alsa_stream->interpolate_start) * runtime->rate, 1000000000);
-
audio_info(" .. OUT\n");
return snd_pcm_indirect_playback_pointer(substream,
&alsa_stream->pcm_indirect,
--- a/sound/arm/bcm2835.h
+++ b/sound/arm/bcm2835.h
@@ -137,7 +137,6 @@ typedef struct bcm2835_alsa_stream {
unsigned int pos;
unsigned int buffer_size;
unsigned int period_size;
- u64 interpolate_start;
uint32_t enable_fifo_irq;
irq_handler_t fifo_irq_handler;
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