diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0018-bcm2835-i2s-Register-PCM-device.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0018-bcm2835-i2s-Register-PCM-device.patch | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0018-bcm2835-i2s-Register-PCM-device.patch b/target/linux/brcm2708/patches-4.4/0018-bcm2835-i2s-Register-PCM-device.patch new file mode 100644 index 0000000000..eeb7d61b5d --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0018-bcm2835-i2s-Register-PCM-device.patch @@ -0,0 +1,63 @@ +From b58d4ef09eca4674d1530f0c8e1ca074b269ebea Mon Sep 17 00:00:00 2001 +From: Matthias Reichl <hias@horus.com> +Date: Sun, 11 Oct 2015 15:35:20 +0200 +Subject: [PATCH 018/127] bcm2835-i2s: Register PCM device + +Code ported from bcm2708-i2s driver in Raspberry Pi tree. + +RPi commit ba46b4935a23aa2caac1855ead52a035d4776680 ("ASoC: Add +support for BCM2708") + +This driver adds support for digital audio (I2S) +for the BCM2708 SoC that is used by the +Raspberry Pi. External audio codecs can be +connected to the Raspberry Pi via P5 header. + +It relies on cyclic DMA engine support for BCM2708. + +Signed-off-by: Florian Meier <florian.meier@koalo.de> + +Signed-off-by: Matthias Reichl <hias@horus.com> +--- + sound/soc/bcm/bcm2835-i2s.c | 23 ++++++++++++++++++++++- + 1 file changed, 22 insertions(+), 1 deletion(-) + +--- a/sound/soc/bcm/bcm2835-i2s.c ++++ b/sound/soc/bcm/bcm2835-i2s.c +@@ -799,6 +799,25 @@ static const struct snd_soc_component_dr + .name = "bcm2835-i2s-comp", + }; + ++static const struct snd_pcm_hardware bcm2835_pcm_hardware = { ++ .info = SNDRV_PCM_INFO_INTERLEAVED | ++ SNDRV_PCM_INFO_JOINT_DUPLEX, ++ .formats = SNDRV_PCM_FMTBIT_S16_LE | ++ SNDRV_PCM_FMTBIT_S24_LE | ++ SNDRV_PCM_FMTBIT_S32_LE, ++ .period_bytes_min = 32, ++ .period_bytes_max = 64 * PAGE_SIZE, ++ .periods_min = 2, ++ .periods_max = 255, ++ .buffer_bytes_max = 128 * PAGE_SIZE, ++}; ++ ++static const struct snd_dmaengine_pcm_config bcm2835_dmaengine_pcm_config = { ++ .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, ++ .pcm_hardware = &bcm2835_pcm_hardware, ++ .prealloc_buffer_size = 256 * PAGE_SIZE, ++}; ++ + static int bcm2835_i2s_probe(struct platform_device *pdev) + { + struct bcm2835_i2s_dev *dev; +@@ -870,7 +889,9 @@ static int bcm2835_i2s_probe(struct plat + return ret; + } + +- ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); ++ ret = devm_snd_dmaengine_pcm_register(&pdev->dev, ++ &bcm2835_dmaengine_pcm_config, ++ SND_DMAENGINE_PCM_FLAG_COMPAT); + if (ret) { + dev_err(&pdev->dev, "Could not register PCM: %d\n", ret); + return ret; |