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| author | Andy Walls <awalls@radix.net> | 2010-02-10 15:34:46 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-02-26 15:11:07 -0300 |
| commit | 587808d5f59e842f9258a15e88ad530fcf6e6763 (patch) | |
| tree | 07252eaff987faf5ad1b6256d520c13ab90e4554 /drivers/media/video/ivtv/ivtv-irq.c | |
| parent | 00cb9f6920aaeb34bcef146085ae57e363641a85 (diff) | |
| download | op-kernel-dev-587808d5f59e842f9258a15e88ad530fcf6e6763.zip op-kernel-dev-587808d5f59e842f9258a15e88ad530fcf6e6763.tar.gz | |
V4L/DVB: ivtv: Fix ivtv_api_get_data() to avoid unneeded IO during IRQ handling
ivtv_api_get_data() was performing more PCI MMIO than needed, resulting
often in it accounting for more than half the total time spent in
ivtv_irq_handler(). Now it only reads at most 7 of the 16 mailbox data words
over the PCI bus, and in some instances only 2 or 3 data words as needed.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/ivtv/ivtv-irq.c')
| -rw-r--r-- | drivers/media/video/ivtv/ivtv-irq.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/media/video/ivtv/ivtv-irq.c b/drivers/media/video/ivtv/ivtv-irq.c index ee0cdde..12d36ca 100644 --- a/drivers/media/video/ivtv/ivtv-irq.c +++ b/drivers/media/video/ivtv/ivtv-irq.c @@ -562,7 +562,7 @@ static void ivtv_irq_enc_dma_complete(struct ivtv *itv) u32 data[CX2341X_MBOX_MAX_DATA]; struct ivtv_stream *s; - ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA_END, data); + ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA_END, 2, data); IVTV_DEBUG_HI_IRQ("ENC DMA COMPLETE %x %d (%d)\n", data[0], data[1], itv->cur_dma_stream); del_timer(&itv->dma_timer); @@ -638,7 +638,7 @@ static void ivtv_irq_dma_err(struct ivtv *itv) u32 data[CX2341X_MBOX_MAX_DATA]; del_timer(&itv->dma_timer); - ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA_END, data); + ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA_END, 2, data); 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); @@ -669,7 +669,7 @@ static void ivtv_irq_enc_start_cap(struct ivtv *itv) struct ivtv_stream *s; /* Get DMA destination and size arguments from card */ - ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA, data); + ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA, 7, data); IVTV_DEBUG_HI_IRQ("ENC START CAP %d: %08x %08x\n", data[0], data[1], data[2]); if (data[0] > 2 || data[1] == 0 || data[2] == 0) { @@ -713,9 +713,9 @@ static void ivtv_irq_dec_data_req(struct ivtv *itv) struct ivtv_stream *s; /* YUV or MPG */ - ivtv_api_get_data(&itv->dec_mbox, IVTV_MBOX_DMA, data); if (test_bit(IVTV_F_I_DEC_YUV, &itv->i_flags)) { + ivtv_api_get_data(&itv->dec_mbox, IVTV_MBOX_DMA, 2, data); itv->dma_data_req_size = 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31); itv->dma_data_req_offset = data[1]; @@ -724,6 +724,7 @@ static void ivtv_irq_dec_data_req(struct ivtv *itv) s = &itv->streams[IVTV_DEC_STREAM_TYPE_YUV]; } else { + ivtv_api_get_data(&itv->dec_mbox, IVTV_MBOX_DMA, 3, data); itv->dma_data_req_size = min_t(u32, data[2], 0x10000); itv->dma_data_req_offset = data[1]; s = &itv->streams[IVTV_DEC_STREAM_TYPE_MPG]; |
