diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0388-Revert-bcm2835-interpolate-audio-delay.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0388-Revert-bcm2835-interpolate-audio-delay.patch | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0388-Revert-bcm2835-interpolate-audio-delay.patch b/target/linux/brcm2708/patches-4.19/950-0388-Revert-bcm2835-interpolate-audio-delay.patch new file mode 100644 index 0000000000..9b4f6d741b --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0388-Revert-bcm2835-interpolate-audio-delay.patch @@ -0,0 +1,71 @@ +From 83251570f16ec848694dac016cbdb55b1d28496d Mon Sep 17 00:00:00 2001 +From: popcornmix <popcornmix@gmail.com> +Date: Mon, 29 Apr 2019 19:16:14 +0100 +Subject: [PATCH] Revert "bcm2835: interpolate audio delay" + +commit fb4b9f02986fcb5ae751106ef9b027806b5dd750 upstream. + +This reverts commit fb8cc99f05687ca5565dc53a7ee0dd86aefad952. +--- + .../vc04_services/bcm2835-audio/bcm2835-pcm.c | 12 +----------- + .../staging/vc04_services/bcm2835-audio/bcm2835.h | 1 - + 2 files changed, 1 insertion(+), 12 deletions(-) + +--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c ++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c +@@ -11,7 +11,7 @@ + /* hardware definition */ + static const 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, +@@ -81,8 +81,6 @@ void bcm2835_playback_fifo(struct bcm283 + 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); +@@ -308,7 +306,6 @@ 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, +@@ -400,19 +397,12 @@ snd_bcm2835_pcm_pointer(struct snd_pcm_s + { + struct snd_pcm_runtime *runtime = substream->runtime; + struct bcm2835_alsa_stream *alsa_stream = runtime->private_data; +- u64 now = ktime_get_ns(); + + audio_debug("pcm_pointer... (%d) hwptr=%d appl=%d pos=%d\n", 0, + frames_to_bytes(runtime, runtime->status->hw_ptr), + 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); +- + return snd_pcm_indirect_playback_pointer(substream, + &alsa_stream->pcm_indirect, + alsa_stream->pos); +--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h ++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h +@@ -133,7 +133,6 @@ struct bcm2835_alsa_stream { + unsigned int pos; + unsigned int buffer_size; + unsigned int period_size; +- u64 interpolate_start; + + atomic_t retrieved; + struct bcm2835_audio_instance *instance; |