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Whether residue can be reported or not is not a property of the audio controller but of the DMA controller. The FLAG_NO_RESIDUE was initially added when the DMAengine framework had no support for describing the residue reporting capabilities of the controller. Support for this was added quite a while ago and recently the DMAengine framework started to complain if a driver does not describe its capabilities and a lot of patches have been merged that add support for this where it was missing. So it should be safe to assume that driver on actively used platforms properly implement the DMA capabilities API. This patch makes the FLAG_NO_RESIDUE internal and no longer allows audio controller drivers to manually set the flag. If a DMA driver against expectations does not support reporting its capabilities for now the generic DMAengine PCM driver will now emit a warning and simply assume that residue reporting is not supported. In the future this might be changed to aborting with an error. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@kernel.org>
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*
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* linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
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*
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* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
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* Copyright (C) 2006 Applied Data Systems
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*
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* Rewritten for the SoC audio subsystem (Based on PXA2xx code):
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* Copyright (c) 2008 Ryan Mallon
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/dmaengine.h>
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#include <sound/pcm.h>
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#include <sound/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include <linux/platform_data/dma-ep93xx.h>
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#include "ep93xx-pcm.h"
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static const struct snd_pcm_hardware ep93xx_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_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER),
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.buffer_bytes_max = 131072,
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.period_bytes_min = 32,
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.period_bytes_max = 32768,
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.periods_min = 1,
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.periods_max = 32,
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.fifo_size = 32,
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};
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static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
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{
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struct ep93xx_dma_data *data = filter_param;
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if (data->direction == ep93xx_dma_chan_direction(chan)) {
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chan->private = data;
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return true;
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}
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return false;
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}
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static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config = {
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.pcm_hardware = &ep93xx_pcm_hardware,
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.compat_filter_fn = ep93xx_pcm_dma_filter,
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.prealloc_buffer_size = 131072,
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};
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int devm_ep93xx_pcm_platform_register(struct device *dev)
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{
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return devm_snd_dmaengine_pcm_register(dev,
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&ep93xx_dmaengine_pcm_config,
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SND_DMAENGINE_PCM_FLAG_NO_DT |
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SND_DMAENGINE_PCM_FLAG_COMPAT);
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}
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EXPORT_SYMBOL_GPL(devm_ep93xx_pcm_platform_register);
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MODULE_AUTHOR("Ryan Mallon");
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MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
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MODULE_LICENSE("GPL");
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