* Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> [120418 12:12]:
> On Wed, Apr 18, 2012 at 11:11:12AM -0700, Tony Lindgren wrote:
> > * Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> [120418 03:15]:
> > > Add DMA engine support to the OMAP HSMMC driver. This supplements the
> > > private DMA API implementation contained within this driver, and the
> > > driver can be switched at build time between using DMA engine and the
> > > private DMA API.
> >
> > Glad to see this happening!
> >
> > No luck here though, after a quick test I'm getting the following with MMC
> > not working:
>
> Did you enable OMAP DMA engine support?
Heh that's it :) Yup it works now after adding:
CONFIG_DMADEVICES=y
CONFIG_DMA_OMAP=y
How about just continue on PIO if DMA reques fails:
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1921,16 +1921,12 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev)
dma_cap_set(DMA_SLAVE, mask);
host->rx_chan = dma_request_channel(mask, omap_dma_filter_fn, &rx_req);
- if (!host->rx_chan) {
- dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
- goto err_irq;
- }
+ if (!host->rx_chan)
+ dev_info(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
host->tx_chan = dma_request_channel(mask, omap_dma_filter_fn, &tx_req);
- if (!host->tx_chan) {
- dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
- goto err_irq;
- }
+ if (!host->tx_chan)
+ dev_info(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
/* Request IRQ for MMC operations */
ret = request_irq(host->irq, omap_hsmmc_irq, 0,
--
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