The current number of requestor lines is limited to 31. This was an error of a previous commit, as this number is platform dependent, and is actually : - for pxa25x: 40 requestor lines - for pxa27x: 74 requestor lines - for pxa3xx: 100 requestor lines As the driver doesn't need to know the exact number, but only an absolute maximum value above which is it not using any flow control, set the maximum to 0x8000 requestor lines, which should never be reached. The previous testing did not reveal the faulty constant as on pxa[23]xx platforms, only camera, MSL and USB are above requestor 32, and in these only the camera has a driver using dma. Fixes: e87ffbdf0697 ("dmaengine: pxa_dma: fix the no-requestor case") Signed-off-by: Robert Jarzmik <robert.jarzmik@xxxxxxx> --- drivers/dma/pxa_dma.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/dma/pxa_dma.c b/drivers/dma/pxa_dma.c index ca6c088edc8a..817a2bdc423d 100644 --- a/drivers/dma/pxa_dma.c +++ b/drivers/dma/pxa_dma.c @@ -53,6 +53,7 @@ #define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */ #define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */ +#define DRCMR_MAXREQST 0x7fff /* Maximum requestor line */ #define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */ #define DDADR_STOP BIT(0) /* Stop (read / write) */ @@ -473,7 +474,7 @@ static void pxad_free_phy(struct pxad_chan *chan) return; /* clear the channel mapping in DRCMR */ - if (chan->drcmr <= DRCMR_CHLNUM) { + if (chan->drcmr <= DRCMR_MAXREQST) { reg = pxad_drcmr(chan->drcmr); writel_relaxed(0, chan->phy->base + reg); } @@ -518,7 +519,7 @@ static void phy_enable(struct pxad_phy *phy, bool misaligned) "%s(); phy=%p(%d) misaligned=%d\n", __func__, phy, phy->idx, misaligned); - if (phy->vchan->drcmr <= DRCMR_CHLNUM) { + if (phy->vchan->drcmr <= DRCMR_MAXREQST) { reg = pxad_drcmr(phy->vchan->drcmr); writel_relaxed(DRCMR_MAPVLD | phy->idx, phy->base + reg); } @@ -922,7 +923,7 @@ static void pxad_get_config(struct pxad_chan *chan, dev_addr = chan->cfg.src_addr; *dev_src = dev_addr; *dcmd |= PXA_DCMD_INCTRGADDR; - if (chan->drcmr <= DRCMR_CHLNUM) + if (chan->drcmr <= DRCMR_MAXREQST) *dcmd |= PXA_DCMD_FLOWSRC; } if (dir == DMA_MEM_TO_DEV) { @@ -931,7 +932,7 @@ static void pxad_get_config(struct pxad_chan *chan, dev_addr = chan->cfg.dst_addr; *dev_dst = dev_addr; *dcmd |= PXA_DCMD_INCSRCADDR; - if (chan->drcmr <= DRCMR_CHLNUM) + if (chan->drcmr <= DRCMR_MAXREQST) *dcmd |= PXA_DCMD_FLOWTRG; } if (dir == DMA_MEM_TO_MEM) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html