summaryrefslogtreecommitdiffstats
path: root/drivers/media/video/ivtv/ivtv-irq.c
diff options
context:
space:
mode:
authorAndy Walls <awalls@radix.net>2010-02-10 15:34:46 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2010-02-26 15:11:07 -0300
commit587808d5f59e842f9258a15e88ad530fcf6e6763 (patch)
tree07252eaff987faf5ad1b6256d520c13ab90e4554 /drivers/media/video/ivtv/ivtv-irq.c
parent00cb9f6920aaeb34bcef146085ae57e363641a85 (diff)
downloadop-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.c9
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];
OpenPOWER on IntegriCloud