1 files changed, 0 insertions, 80 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0127-bcm2835-restrict-channels-rate-to-8-960000.patch b/target/linux/brcm2708/patches-4.4/0127-bcm2835-restrict-channels-rate-to-8-960000.patch
deleted file mode 100644
index fc38b33ab0..0000000000
--- a/target/linux/brcm2708/patches-4.4/0127-bcm2835-restrict-channels-rate-to-8-960000.patch
+++ /dev/null
@@ -1,80 +0,0 @@
-From fe51d76ced4088c11981b835a7b741ee9e0df10e Mon Sep 17 00:00:00 2001
-From: wm4 <wm4@nowhere>
-Date: Wed, 13 Jan 2016 19:42:18 +0100
-Subject: [PATCH] bcm2835: restrict channels*rate to 8*960000
-
-This is required at least for SPDIF. If the bitrate goes above,
-videocore will either resample the audio or corrupt it due to
-underruns. Supposedly the hardware isn't designed to output
-higher rates, but it can still resample it down to supported
-rates.
-
-Some code is based on ac97_pcm.c.
----
- sound/arm/bcm2835-pcm.c | 41 +++++++++++++++++++++++++++++++++++++++++
- 1 file changed, 41 insertions(+)
-
---- a/sound/arm/bcm2835-pcm.c
-+++ b/sound/arm/bcm2835-pcm.c
-@@ -19,6 +19,9 @@
- 
- #include "bcm2835.h"
- 
-+/* The hardware can not do much more num_channels*samplerate then this value */
-+#define MAX_COMBINED_RATE 768000
-+
- /* hardware definition */
- static struct snd_pcm_hardware snd_bcm2835_playback_hw = {
- 	.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
-@@ -107,6 +110,31 @@ static irqreturn_t bcm2835_playback_fifo
- 	return IRQ_HANDLED;
- }
- 
-+
-+static int rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
-+				   struct snd_pcm_hw_rule *rule)
-+{
-+	struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
-+	struct snd_interval rates = {
-+		.min = 8000,
-+		.max = min(192000u, MAX_COMBINED_RATE / max(channels->min, 1u)),
-+	};
-+	struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
-+	return snd_interval_refine(rate, &rates);
-+}
-+
-+static int rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
-+				       struct snd_pcm_hw_rule *rule)
-+{
-+	struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
-+	struct snd_interval channels_interval = {
-+		.min = 1,
-+		.max = min(8u, MAX_COMBINED_RATE / max(rate->min, 1u)),
-+	};
-+	struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
-+	return snd_interval_refine(channels, &channels_interval);
-+}
-+
- /* open callback */
- static int snd_bcm2835_playback_open_generic(
- 		struct snd_pcm_substream *substream, int spdif)
-@@ -188,6 +216,19 @@ static int snd_bcm2835_playback_open_gen
- 	snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
- 				   16);
- 
-+	/* When playing PCM, pretend that we support the full range of channels
-+	 * and sample rates. The GPU can't output it, but is able to resample
-+	 * the data to a rate the hardware can handle it. This won't work with
-+	 * compressed data; the resampler would just destroy it. */
-+	if (spdif) {
-+		err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
-+					  rate_hw_constraint_rate, NULL,
-+					  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
-+		err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
-+					  rate_hw_constraint_channels, NULL,
-+					  SNDRV_PCM_HW_PARAM_RATE, -1);
-+	}
-+
- 	chip->alsa_stream[idx] = alsa_stream;
- 
- 	chip->opened |= (1 << idx);