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dd7e8d903e
When non standard names are used it is possible that one of the directions
are not provided, thus the flags needs to be present to tell the core that
we have half duplex setup.
Fixes: 642aafea88 ("ASoC: ti: remove compat dma probing")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20191028115207.5142-1-peter.ujfalusi@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
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* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include "sdma-pcm.h"
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static const struct snd_pcm_hardware sdma_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
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SNDRV_PCM_INFO_INTERLEAVED,
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.period_bytes_min = 32,
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.period_bytes_max = 64 * 1024,
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.buffer_bytes_max = 128 * 1024,
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.periods_min = 2,
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.periods_max = 255,
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};
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static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = {
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.pcm_hardware = &sdma_pcm_hardware,
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.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
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.prealloc_buffer_size = 128 * 1024,
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};
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int sdma_pcm_platform_register(struct device *dev,
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char *txdmachan, char *rxdmachan)
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{
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struct snd_dmaengine_pcm_config *config;
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unsigned int flags = 0;
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/* Standard names for the directions: 'tx' and 'rx' */
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if (!txdmachan && !rxdmachan)
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return devm_snd_dmaengine_pcm_register(dev,
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&sdma_dmaengine_pcm_config, 0);
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config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
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if (!config)
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return -ENOMEM;
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*config = sdma_dmaengine_pcm_config;
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if (!txdmachan || !rxdmachan) {
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/* One direction only PCM */
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flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX;
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if (!txdmachan) {
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txdmachan = rxdmachan;
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rxdmachan = NULL;
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}
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}
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config->chan_names[0] = txdmachan;
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config->chan_names[1] = rxdmachan;
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return devm_snd_dmaengine_pcm_register(dev, config, flags);
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}
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EXPORT_SYMBOL_GPL(sdma_pcm_platform_register);
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MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
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MODULE_DESCRIPTION("sDMA PCM ASoC platform driver");
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MODULE_LICENSE("GPL v2");
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