c641d09c60
cx18: Throttle mmio to/from the CX23418 so boards work in older systems. The CX23418 couldn't reliably handle mmio at the rate at which the cx18 driver was attempting to access the chip. The PCI bridge arrangements and settings on modern motherboards still allowed the CX23418 to work OK, but it didn't work well on many older motherboards: mysterious I2C errors, firmware loading errors, etc. This patch adds a throttle to *all* mmio access to the CX23418. It defaults to a delay of 31 ns, but is adjustable by the mmio_ndelay module parm. My HVR-1600 and Raptor PAL/SECAM card now function for analog capture on a motherboard with an Intel 82810E Northbridge and 82801AA Southbridge. Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/*
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* cx18 buffer queues
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*
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* Derived from ivtv-queue.h
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*
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* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
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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 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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*
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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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*
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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
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* 02111-1307 USA
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*/
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#define CX18_DMA_UNMAPPED ((u32) -1)
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/* cx18_buffer utility functions */
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static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
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struct cx18_buffer *buf)
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{
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pci_dma_sync_single_for_cpu(s->cx->dev, buf->dma_handle,
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s->buf_size, s->dma);
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}
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static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
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struct cx18_buffer *buf)
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{
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pci_dma_sync_single_for_device(s->cx->dev, buf->dma_handle,
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s->buf_size, s->dma);
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}
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void cx18_buf_swap(struct cx18_buffer *buf);
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/* cx18_queue utility functions */
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void cx18_queue_init(struct cx18_queue *q);
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void cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
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struct cx18_queue *q);
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struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
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struct cx18_buffer *cx18_queue_get_buf_irq(struct cx18_stream *s, u32 id,
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u32 bytesused);
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void cx18_flush_queues(struct cx18_stream *s);
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/* cx18_stream utility functions */
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int cx18_stream_alloc(struct cx18_stream *s);
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void cx18_stream_free(struct cx18_stream *s);
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