On Oct 12, 2012, at 6:58 AM, Daniel Mack wrote: > The .direction field of the config passed to dmaengine_slave_config() > must be set in order to make the generic code store the configured bus > width. > > Without this patch, I keep getting the following error on a AM33xx > board: > > [ 1.963144] edma-dma-engine edma-dma-engine.0: Undefined slave buswidth > [ 1.970158] omap_hsmmc mmc.4: prep_slave_sg() failed > [ 1.975454] mmc1: error -1 whilst initialising SD card
Hi Daniel, I posted a patch to fix the slave config handling in the EDMA DMA Engine driver here: https://patchwork.kernel.org/patch/1474411/ Vinod didn't pick that up for 3.7, probably because it's not triggered by any of the in-tree davinci drivers that are converted. However, I am carrying the same patch in the am335x edma dmaengine v2 series (https://lkml.org/lkml/2012/10/11/345) so there's no need to change this driver. -Matt > > Signed-off-by: Daniel Mack <[email protected]> > Cc: Venkatraman S <[email protected]> > Cc: Chris Ball <[email protected]> > Cc: Grant Likely <[email protected]> > Cc: Rob Herring <[email protected]> > Cc: [email protected] > Cc: Matt Porter <[email protected]> > Cc: Russell King <[email protected]> > --- > drivers/mmc/host/omap_hsmmc.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c > index 4b70823..2c57b0d 100644 > --- a/drivers/mmc/host/omap_hsmmc.c > +++ b/drivers/mmc/host/omap_hsmmc.c > @@ -1260,6 +1260,8 @@ static int omap_hsmmc_start_dma_transfer(struct > omap_hsmmc_host *host, > cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; > cfg.src_maxburst = data->blksz / 4; > cfg.dst_maxburst = data->blksz / 4; > + cfg.direction = data->flags & MMC_DATA_WRITE ? > + DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; > > ret = dmaengine_slave_config(chan, &cfg); > if (ret) > @@ -1270,8 +1272,8 @@ static int omap_hsmmc_start_dma_transfer(struct > omap_hsmmc_host *host, > return ret; > > tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, > - data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, > - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); > + cfg.direction, > + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); > if (!tx) { > dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n"); > /* FIXME: cleanup */ > -- > 1.7.11.4 > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
