diff options
| author | Robert Jarzmik <robert.jarzmik@free.fr> | 2015-09-30 19:42:14 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2015-10-01 04:14:25 +0200 |
| commit | e87ffbdf06971a80ad2a11217200bdd936195af1 (patch) | |
| tree | 68607591da1fef0f854285ac9e0e50bb90b5509f /drivers/dma/pxa_dma.c | |
| parent | dmaengine: zxdma: Fix off-by-one for testing valid pchan request (diff) | |
| download | linux-e87ffbdf06971a80ad2a11217200bdd936195af1.tar.xz linux-e87ffbdf06971a80ad2a11217200bdd936195af1.zip | |
dmaengine: pxa_dma: fix the no-requestor case
A very small number of devices don't use the flow control offered by
requestor lines. In these specific cases, the pxa dma driver should be
aware of that and not try to use a requestor line.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/pxa_dma.c')
| -rw-r--r-- | drivers/dma/pxa_dma.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/dma/pxa_dma.c b/drivers/dma/pxa_dma.c index c6723ecd5848..064a8266a3b7 100644 --- a/drivers/dma/pxa_dma.c +++ b/drivers/dma/pxa_dma.c @@ -473,8 +473,10 @@ static void pxad_free_phy(struct pxad_chan *chan) return; /* clear the channel mapping in DRCMR */ - reg = pxad_drcmr(chan->drcmr); - writel_relaxed(0, chan->phy->base + reg); + if (chan->drcmr <= DRCMR_CHLNUM) { + reg = pxad_drcmr(chan->drcmr); + writel_relaxed(0, chan->phy->base + reg); + } spin_lock_irqsave(&pdev->phy_lock, flags); for (i = 0; i < 32; i++) @@ -516,8 +518,10 @@ static void phy_enable(struct pxad_phy *phy, bool misaligned) "%s(); phy=%p(%d) misaligned=%d\n", __func__, phy, phy->idx, misaligned); - reg = pxad_drcmr(phy->vchan->drcmr); - writel_relaxed(DRCMR_MAPVLD | phy->idx, phy->base + reg); + if (phy->vchan->drcmr <= DRCMR_CHLNUM) { + reg = pxad_drcmr(phy->vchan->drcmr); + writel_relaxed(DRCMR_MAPVLD | phy->idx, phy->base + reg); + } dalgn = phy_readl_relaxed(phy, DALGN); if (misaligned) @@ -911,14 +915,18 @@ static void pxad_get_config(struct pxad_chan *chan, width = chan->cfg.src_addr_width; dev_addr = chan->cfg.src_addr; *dev_src = dev_addr; - *dcmd |= PXA_DCMD_INCTRGADDR | PXA_DCMD_FLOWSRC; + *dcmd |= PXA_DCMD_INCTRGADDR; + if (chan->drcmr <= DRCMR_CHLNUM) + *dcmd |= PXA_DCMD_FLOWSRC; } if (dir == DMA_MEM_TO_DEV) { maxburst = chan->cfg.dst_maxburst; width = chan->cfg.dst_addr_width; dev_addr = chan->cfg.dst_addr; *dev_dst = dev_addr; - *dcmd |= PXA_DCMD_INCSRCADDR | PXA_DCMD_FLOWTRG; + *dcmd |= PXA_DCMD_INCSRCADDR; + if (chan->drcmr <= DRCMR_CHLNUM) + *dcmd |= PXA_DCMD_FLOWTRG; } if (dir == DMA_MEM_TO_MEM) *dcmd |= PXA_DCMD_BURST32 | PXA_DCMD_INCTRGADDR | |