On Mon, Feb 08, 2016 at 03:18:51PM +0100, Robert Jarzmik wrote:
> 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
and why would that be a good assumption?
Btw shouldn't this data come from DT?
> 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
>
> --
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--
~Vinod
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