From d017ad0179e407a81ed2423f7620d46584470ad4 Mon Sep 17 00:00:00 2001 From: Waldemar Brodkorb Date: Thu, 26 Mar 2015 13:00:07 +0100 Subject: [PATCH] i2s: allow to enable ALSA MMAP For some ALSA plugins like dmix MMAP is required. Allow to enable it via a module parameter called use_mmap. Signed-off-by: Waldemar Brodkorb --- sound/soc/bcm/bcm2708-i2s.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/sound/soc/bcm/bcm2708-i2s.c b/sound/soc/bcm/bcm2708-i2s.c index 7570e50..3d3692f 100644 --- a/sound/soc/bcm/bcm2708-i2s.c +++ b/sound/soc/bcm/bcm2708-i2s.c @@ -171,6 +171,11 @@ static const unsigned int bcm2708_clk_freq[BCM2708_CLK_SRC_HDMI+1] = { /* I2S pin configuration */ static int bcm2708_i2s_gpio=BCM2708_I2S_GPIO_AUTO; +static bool use_mmap = 0; +module_param(use_mmap, bool, S_IRUGO); +MODULE_PARM_DESC(use_mmap, "Use MMAP"); + + /* General device struct */ struct bcm2708_i2s_dev { struct device *dev; @@ -874,7 +879,7 @@ static const struct snd_soc_component_driver bcm2708_i2s_component = { .name = "bcm2708-i2s-comp", }; -static const struct snd_pcm_hardware bcm2708_pcm_hardware = { +static struct snd_pcm_hardware bcm2708_pcm_hardware = { .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_JOINT_DUPLEX, .formats = SNDRV_PCM_FMTBIT_S16_LE | @@ -966,6 +971,12 @@ static int bcm2708_i2s_probe(struct platform_device *pdev) return ret; } + if (use_mmap) { + printk("Enable ALSA MMAP support for I2S\n"); + bcm2708_pcm_hardware.info |= SNDRV_PCM_INFO_MMAP; + bcm2708_pcm_hardware.info |= SNDRV_PCM_INFO_MMAP_VALID; + } + ret = snd_dmaengine_pcm_register(&pdev->dev, &bcm2708_dmaengine_pcm_config, SND_DMAENGINE_PCM_FLAG_COMPAT); -- 1.9.1