On Tue, Sep 12, 2017 at 01:44:20PM +0300, Peter Ujfalusi wrote: > Set the device's max_burst to 32767 (CIDX is 16bit signed value) so clients > can take this into consideration when setting up the trasnfer. /s/trasnfer/transfer > > During slave transfer preparation check if the requested maxburst is valid. > > Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx> > --- > drivers/dma/edma.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c > index 3879f80a4815..6970355abdc9 100644 > --- a/drivers/dma/edma.c > +++ b/drivers/dma/edma.c > @@ -891,6 +891,10 @@ static int edma_slave_config(struct dma_chan *chan, > cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) > return -EINVAL; > > + if (cfg->src_maxburst > chan->device->max_burst || > + cfg->dst_maxburst > chan->device->max_burst) > + return -EINVAL; > + > memcpy(&echan->cfg, cfg, sizeof(echan->cfg)); > > return 0; > @@ -1855,6 +1859,7 @@ static void edma_dma_init(struct edma_cc *ecc, bool legacy_mode) > s_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS; > s_ddev->directions |= (BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV)); > s_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; > + s_ddev->max_burst = SZ_32K - 1; /* CIDX: 16bit signed */ > > s_ddev->dev = ecc->dev; > INIT_LIST_HEAD(&s_ddev->channels); > -- > 2.14.1 > > > Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki > > -- ~Vinod -- 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
