37093b1ea6
It turns out that the cx23415/6 DMA engine cannot do scatter/gather DMA reliably. Every so often depending on the phase of the moon and your hardware configuration the cx2341x DMA engine simply chokes on it and you have to reboot to get it working again. This change replaced the scatter/gather DMA by single transfers at a time, where the driver is now responsible for DMA-ing each buffer. UDMA is still done using scatter/gather DMA, that will be fixed soon. Many thanks to Mark Bryars <mark.bryars@etvinteractive.com> for discovering the link between scatter/gather and the DMA timeouts. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/*
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buffer queues.
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Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
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Copyright (C) 2004 Chris Kennedy <c@groovy.org>
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Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
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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 as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define IVTV_DMA_UNMAPPED ((u32) -1)
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#define SLICED_VBI_PIO 1
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/* ivtv_buffer utility functions */
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static inline int ivtv_might_use_pio(struct ivtv_stream *s)
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{
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return s->dma == PCI_DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI);
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}
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static inline int ivtv_use_pio(struct ivtv_stream *s)
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{
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struct ivtv *itv = s->itv;
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return s->dma == PCI_DMA_NONE ||
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(SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set);
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}
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static inline int ivtv_might_use_dma(struct ivtv_stream *s)
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{
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return s->dma != PCI_DMA_NONE;
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}
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static inline int ivtv_use_dma(struct ivtv_stream *s)
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{
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return !ivtv_use_pio(s);
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}
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static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
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{
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if (ivtv_use_dma(s))
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pci_dma_sync_single_for_cpu(s->itv->dev, buf->dma_handle,
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s->buf_size + 256, s->dma);
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}
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static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
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{
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if (ivtv_use_dma(s))
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pci_dma_sync_single_for_device(s->itv->dev, buf->dma_handle,
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s->buf_size + 256, s->dma);
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}
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int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
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void ivtv_buf_swap(struct ivtv_buffer *buf);
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/* ivtv_queue utility functions */
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void ivtv_queue_init(struct ivtv_queue *q);
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void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
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struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
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int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
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struct ivtv_queue *to, int needed_bytes);
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void ivtv_flush_queues(struct ivtv_stream *s);
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/* ivtv_stream utility functions */
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int ivtv_stream_alloc(struct ivtv_stream *s);
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void ivtv_stream_free(struct ivtv_stream *s);
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static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
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{
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if (ivtv_use_dma(s))
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pci_dma_sync_single_for_cpu(s->itv->dev, s->sg_handle,
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sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
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}
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static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
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{
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if (ivtv_use_dma(s))
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pci_dma_sync_single_for_device(s->itv->dev, s->sg_handle,
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sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
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}
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