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- From d017ad0179e407a81ed2423f7620d46584470ad4 Mon Sep 17 00:00:00 2001
- From: Waldemar Brodkorb <wbrodkorb@conet.de>
- 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 <wbrodkorb@conet.de>
- ---
- 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
|
