/* * atmel-pcm-dma.c -- ALSA PCM DMA support for the Atmel SoC. * * Copyright (C) 2012 Atmel * * Author: Bo Shen * * Based on atmel-pcm by: * Sedji Gaouaou * Copyright 2008 Atmel * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "atmel-pcm.h" /*--------------------------------------------------------------------------*\ * Hardware definition \*--------------------------------------------------------------------------*/ static const struct snd_pcm_hardware atmel_pcm_dma_hardware = { .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_PAUSE, .period_bytes_min = 256, /* lighting DMA overhead */ .period_bytes_max = 2 * 0xffff, /* if 2 bytes format */ .periods_min = 8, .periods_max = 1024, /* no limit */ .buffer_bytes_max = 512 * 1024, }; /** * atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC * * We use DMAENGINE to send/receive data to/from SSC so this ISR is only to * check if any overrun occured. */ static void atmel_pcm_dma_irq(u32 ssc_sr, struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct atmel_pcm_dma_params *prtd; prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if (ssc_sr & prtd->mask->ssc_error) { if (snd_pcm_running(substream)) pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n", substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? "underrun" : "overrun", prtd->name, ssc_sr); /* stop RX and capture: will be enabled again at restart */ ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_disable); snd_pcm_stop_xrun(substream); /* now drain RHR and read status to remove xrun condition */ ssc_readx(prtd->ssc->regs, SSC_RHR); ssc_readx(prtd->ssc->regs, SSC_SR); } } static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct atmel_pcm_dma_params *prtd; struct ssc_device *ssc; int ret; prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); ssc = prtd->ssc; ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config); if (ret) { pr_err("atmel-pcm: hwparams to dma slave configure failed\n"); return ret; } slave_config->dst_addr = ssc->phybase + SSC_THR; slave_config->dst_maxburst = 1; slave_config->src_addr = ssc->phybase + SSC_RHR; slave_config->src_maxburst = 1; prtd->dma_intr_handler = atmel_pcm_dma_irq; return 0; } static const struct snd_dmaengine_pcm_config atmel_dmaengine_pcm_config = { .prepare_slave_config = atmel_pcm_configure_dma, .pcm_hardware = &atmel_pcm_dma_hardware, .prealloc_buffer_size = 64 * 1024, }; int atmel_pcm_dma_platform_register(struct device *dev) { return snd_dmaengine_pcm_register(dev, &atmel_dmaengine_pcm_config, 0); } EXPORT_SYMBOL(atmel_pcm_dma_platform_register); void atmel_pcm_dma_platform_unregister(struct device *dev) { snd_dmaengine_pcm_unregister(dev); } EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister); MODULE_AUTHOR("Bo Shen "); MODULE_DESCRIPTION("Atmel DMA based PCM module"); MODULE_LICENSE("GPL"); d>
authorJohan Hovold <johan@kernel.org>2017-01-30 11:26:38 +0100
committerJiri Kosina <jkosina@suse.cz>2017-01-31 12:59:32 +0100
commit7a7b5df84b6b4e5d599c7289526eed96541a0654 (patch)
treecf7514c7ddf4410fe37ca9099a2785e1cf08fa7d /net/atm/pvc.c
parent877a021e08ccb6434718c0cc781fdf943c884cc0 (diff)
HID: cp2112: fix sleep-while-atomic
A recent commit fixing DMA-buffers on stack added a shared transfer buffer protected by a spinlock. This is broken as the USB HID request callbacks can sleep. Fix this up by replacing the spinlock with a mutex. Fixes: 1ffb3c40ffb5 ("HID: cp2112: make transfer buffers DMA capable") Cc: stable <stable@vger.kernel.org> # 4.9 Signed-off-by: Johan Hovold <johan@kernel.org> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'net/atm/pvc.c')