diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0312-Revert-bcm2835-interpolate-audio-delay.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0312-Revert-bcm2835-interpolate-audio-delay.patch | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0312-Revert-bcm2835-interpolate-audio-delay.patch b/target/linux/brcm2708/patches-4.4/0312-Revert-bcm2835-interpolate-audio-delay.patch new file mode 100644 index 0000000000..a972170c19 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0312-Revert-bcm2835-interpolate-audio-delay.patch @@ -0,0 +1,70 @@ +From 65978c7586dc8fe403a3a3bebf40de881b8d2741 Mon Sep 17 00:00:00 2001 +From: popcornmix <popcornmix@gmail.com> +Date: Fri, 29 Apr 2016 17:27:37 +0100 +Subject: [PATCH 312/423] 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; |