diff options
| author | Russell King - ARM Linux <linux@arm.linux.org.uk> | 2011-01-03 22:39:53 +0000 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2011-01-04 19:16:12 -0800 |
| commit | 09b3c323332206aaadfb7aa13efffa82e7719b35 (patch) | |
| tree | a64ddedf5178eef4bab335f90adcada034c77138 /drivers | |
| parent | 4983a04fd2562986360b646b378f267308bc22c0 (diff) | |
| download | linux-09b3c323332206aaadfb7aa13efffa82e7719b35.tar.gz linux-09b3c323332206aaadfb7aa13efffa82e7719b35.tar.bz2 linux-09b3c323332206aaadfb7aa13efffa82e7719b35.zip | |
ARM: PL08x: assign ccfg DMA request signal in prep_phy_channel()
There is no need to wait until we start processing a tx descriptor
before setting up the DMA request selection in the ccfg register.
We know which channel and request will be used in prep_phy_channel(),
so setup the ccfg request selection at txd creation time in
prep_phy_channel().
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/amba-pl08x.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index 75f9e2d4b032..f0a29885cb83 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -194,18 +194,10 @@ static void pl08x_start_txd(struct pl08x_dma_chan *plchan, struct pl08x_driver_data *pl08x = plchan->host; struct pl08x_phy_chan *phychan = plchan->phychan; struct pl08x_lli *lli = &txd->llis_va[0]; - u32 val, ccfg = txd->ccfg; + u32 val; plchan->at = txd; - /* Assign the flow control signal to this channel */ - if (txd->direction == DMA_TO_DEVICE) - /* Select signal as destination */ - ccfg |= phychan->signal << PL080_CONFIG_DST_SEL_SHIFT; - else if (txd->direction == DMA_FROM_DEVICE) - /* Select signal as source */ - ccfg |= phychan->signal << PL080_CONFIG_SRC_SEL_SHIFT; - /* Wait for channel inactive */ while (pl08x_phy_channel_busy(phychan)) cpu_relax(); @@ -214,13 +206,13 @@ static void pl08x_start_txd(struct pl08x_dma_chan *plchan, "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n", phychan->id, lli->src, lli->dst, lli->lli, lli->cctl, - ccfg); + txd->ccfg); writel(lli->src, phychan->base + PL080_CH_SRC_ADDR); writel(lli->dst, phychan->base + PL080_CH_DST_ADDR); writel(lli->lli, phychan->base + PL080_CH_LLI); writel(lli->cctl, phychan->base + PL080_CH_CONTROL); - writel(ccfg, phychan->base + PL080_CH_CONFIG); + writel(txd->ccfg, phychan->base + PL080_CH_CONFIG); /* Enable the DMA channel */ /* Do not access config register until channel shows as disabled */ @@ -1001,6 +993,12 @@ static int prep_phy_channel(struct pl08x_dma_chan *plchan, return -EBUSY; } ch->signal = ret; + + /* Assign the flow control signal to this channel */ + if (txd->direction == DMA_TO_DEVICE) + txd->ccfg |= ch->signal << PL080_CONFIG_DST_SEL_SHIFT; + else if (txd->direction == DMA_FROM_DEVICE) + txd->ccfg |= ch->signal << PL080_CONFIG_SRC_SEL_SHIFT; } dev_dbg(&pl08x->adev->dev, "allocated physical channel %d and signal %d for xfer on %s\n", |