[PATCH 03/03] omap hsmmc: adaptation of sdma descriptor autoloading feature

[Tony Lindgren]

* Venkatraman S <svenkatr at ti.com> [100310 06:08]:
> @@ -1400,14 +1471,23 @@ omap_hsmmc_prepare_data(struct omap_hsmmc_host
> *host, struct mmc_request *req)
>  					| (req->data->blocks << 16));
>  	set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);
> 
> -	if (host->use_dma) {
> -		ret = omap_hsmmc_start_dma_transfer(host, req);
> -		if (ret != 0) {
> -			dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
> +	if (host->dma_caps & DMA_TYPE_SDMA) {
> +		ret = omap_hsmmc_configure_sdma(host, req);
> +		if (ret)
>  			return ret;
> -		}
> +		host->dma_in_use = DMA_TYPE_SDMA;
>  	}
> -	return 0;
> +	if ((host->dma_caps & DMA_TYPE_SDMA_DLOAD) &&
> +		host->data->sg_len > 4) {
> +		ret = omap_hsmmc_configure_sdma_sglist(host, req);
> +		if (ret)
> +			return ret;
> +		host->dma_in_use = DMA_TYPE_SDMA_DLOAD;
> +
> +	}
> +	ret = omap_hsmmc_start_dma_transfer(host);
> +	return ret;
> +
>  }

Does the driver still work in PIO mode?

We need to have the drivers capable to fail over to PIO mode
as the DMA channels can run out.

Regards,

Tony