diff options
| -rw-r--r-- | drivers/media/video/ivtv/ivtv-irq.c | 58 |
1 files changed, 51 insertions, 7 deletions
diff --git a/drivers/media/video/ivtv/ivtv-irq.c b/drivers/media/video/ivtv/ivtv-irq.c index 9b4faf009196..9c29e964d400 100644 --- a/drivers/media/video/ivtv/ivtv-irq.c +++ b/drivers/media/video/ivtv/ivtv-irq.c @@ -628,22 +628,66 @@ static void ivtv_irq_enc_pio_complete(struct ivtv *itv) static void ivtv_irq_dma_err(struct ivtv *itv) { u32 data[CX2341X_MBOX_MAX_DATA]; + u32 status; del_timer(&itv->dma_timer); + ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA_END, 2, data); + status = read_reg(IVTV_REG_DMASTATUS); IVTV_DEBUG_WARN("DMA ERROR %08x %08x %08x %d\n", data[0], data[1], - read_reg(IVTV_REG_DMASTATUS), itv->cur_dma_stream); - write_reg(read_reg(IVTV_REG_DMASTATUS) & 3, IVTV_REG_DMASTATUS); + status, itv->cur_dma_stream); + /* + * We do *not* write back to the IVTV_REG_DMASTATUS register to + * clear the error status, if either the encoder write (0x02) or + * decoder read (0x01) bus master DMA operation do not indicate + * completed. We can race with the DMA engine, which may have + * transitioned to completed status *after* we read the register. + * Setting a IVTV_REG_DMASTATUS flag back to "busy" status, after the + * DMA engine has completed, will cause the DMA engine to stop working. + */ + status &= 0x3; + if (status == 0x3) + write_reg(status, IVTV_REG_DMASTATUS); + if (!test_bit(IVTV_F_I_UDMA, &itv->i_flags) && itv->cur_dma_stream >= 0 && itv->cur_dma_stream < IVTV_MAX_STREAMS) { struct ivtv_stream *s = &itv->streams[itv->cur_dma_stream]; - /* retry */ - if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) + if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) { + /* retry */ + /* + * FIXME - handle cases of DMA error similar to + * encoder below, except conditioned on status & 0x1 + */ ivtv_dma_dec_start(s); - else - ivtv_dma_enc_start(s); - return; + return; + } else { + if ((status & 0x2) == 0) { + /* + * CX2341x Bus Master DMA write is ongoing. + * Reset the timer and let it complete. + */ + itv->dma_timer.expires = + jiffies + msecs_to_jiffies(600); + add_timer(&itv->dma_timer); + return; + } + + if (itv->dma_retries < 3) { + /* + * CX2341x Bus Master DMA write has ended. + * Retry the write, starting with the first + * xfer segment. Just retrying the current + * segment is not sufficient. + */ + s->sg_processed = 0; + itv->dma_retries++; + ivtv_dma_enc_start_xfer(s); + return; + } + /* Too many retries, give up on this one */ + } + } if (test_bit(IVTV_F_I_UDMA, &itv->i_flags)) { ivtv_udma_start(itv); |
