From 587808d5f59e842f9258a15e88ad530fcf6e6763 Mon Sep 17 00:00:00 2001 From: Andy Walls Date: Wed, 10 Feb 2010 15:34:46 -0300 Subject: 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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/ivtv/ivtv-firmware.c | 2 +- drivers/media/video/ivtv/ivtv-irq.c | 9 +++++---- drivers/media/video/ivtv/ivtv-mailbox.c | 9 +++++---- drivers/media/video/ivtv/ivtv-mailbox.h | 3 ++- 4 files changed, 13 insertions(+), 10 deletions(-) (limited to 'drivers/media/video') diff --git a/drivers/media/video/ivtv/ivtv-firmware.c b/drivers/media/video/ivtv/ivtv-firmware.c index c1b7ec475c27..a71e8ba306b0 100644 --- a/drivers/media/video/ivtv/ivtv-firmware.c +++ b/drivers/media/video/ivtv/ivtv-firmware.c @@ -258,7 +258,7 @@ void ivtv_init_mpeg_decoder(struct ivtv *itv) IVTV_ERR("ivtv_init_mpeg_decoder failed to start playback\n"); return; } - ivtv_api_get_data(&itv->dec_mbox, IVTV_MBOX_DMA, data); + ivtv_api_get_data(&itv->dec_mbox, IVTV_MBOX_DMA, 2, data); mem_offset = itv->dec_mem + data[1]; if ((readbytes = load_fw_direct(IVTV_DECODE_INIT_MPEG_FILENAME, diff --git a/drivers/media/video/ivtv/ivtv-irq.c b/drivers/media/video/ivtv/ivtv-irq.c index ee0cdded69f7..12d36ca91d53 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]; diff --git a/drivers/media/video/ivtv/ivtv-mailbox.c b/drivers/media/video/ivtv/ivtv-mailbox.c index 1b5c0ac09a85..84577f6f41a2 100644 --- a/drivers/media/video/ivtv/ivtv-mailbox.c +++ b/drivers/media/video/ivtv/ivtv-mailbox.c @@ -369,10 +369,11 @@ int ivtv_vapi(struct ivtv *itv, int cmd, int args, ...) } /* This one is for stuff that can't sleep.. irq handlers, etc.. */ -void ivtv_api_get_data(struct ivtv_mailbox_data *mbdata, int mb, u32 data[]) +void ivtv_api_get_data(struct ivtv_mailbox_data *mbdata, int mb, + int argc, u32 data[]) { + volatile u32 __iomem *p = mbdata->mbox[mb].data; int i; - - for (i = 0; i < CX2341X_MBOX_MAX_DATA; i++) - data[i] = readl(&mbdata->mbox[mb].data[i]); + for (i = 0; i < argc; i++, p++) + data[i] = readl(p); } diff --git a/drivers/media/video/ivtv/ivtv-mailbox.h b/drivers/media/video/ivtv/ivtv-mailbox.h index 6ef12091e3f3..8247662c928e 100644 --- a/drivers/media/video/ivtv/ivtv-mailbox.h +++ b/drivers/media/video/ivtv/ivtv-mailbox.h @@ -24,7 +24,8 @@ #define IVTV_MBOX_DMA_END 8 #define IVTV_MBOX_DMA 9 -void ivtv_api_get_data(struct ivtv_mailbox_data *mbox, int mb, u32 data[]); +void ivtv_api_get_data(struct ivtv_mailbox_data *mbdata, int mb, + int argc, u32 data[]); int ivtv_api(struct ivtv *itv, int cmd, int args, u32 data[]); int ivtv_vapi_result(struct ivtv *itv, u32 data[CX2341X_MBOX_MAX_DATA], int cmd, int args, ...); int ivtv_vapi(struct ivtv *itv, int cmd, int args, ...); -- cgit v1.2.3