Hi Balaji,
On 18.07.2013 18:40, Balaji T K wrote:
> With DMA channel info retrieved from dt binding on 3.11rc1,
> unused_chan_list is broken after hwmod cleanup removing mmc sdma
> resource info, hence pdev resource wont have DMA resource populated.
>
> arch/arm/common/edma.c
> static int prepare_unused_channel_list(struct device *dev, void *data)
> {
> struct platform_device *pdev = to_platform_device(dev);
> int i, ctlr;
>
> for (i = 0; i < pdev->num_resources; i++) {
> if ((pdev->resource[i].flags & IORESOURCE_DMA) &&
> (int)pdev->resource[i].start >= 0) {
> ctlr = EDMA_CTLR(pdev->resource[i].start);
> clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start),
> edma_cc[ctlr]->edma_unused);
> }
> }
>
> return 0;
> }
>
> int edma_alloc_channel(int channel,
> if (!unused_chan_list_done) {
> /*
> * Scan all the platform devices to find out the EDMA channels
> * used and clear them in the unused list, making the rest
> * available for ARM usage.
> */
> ret = bus_for_each_dev(&platform_bus_type, NULL, NULL,
> prepare_unused_channel_list);
> if (ret < 0)
> return ret;
>
> unused_chan_list_done = true;
> }
>
> ===========
>
> with the below hack patch, edma is working fine with mmc on your 3.11rc1+
> branch
>
> diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
> index a432e6c..5a19164 100644
> --- a/arch/arm/common/edma.c
> +++ b/arch/arm/common/edma.c
> @@ -1262,8 +1262,8 @@ int edma_start(unsigned channel)
> if (test_bit(channel, edma_cc[ctlr]->edma_unused)) {
> pr_debug("EDMA: ESR%d %08x\n", j,
> edma_shadow0_read_array(ctlr, SH_ESR, j));
> - edma_shadow0_write_array(ctlr, SH_ESR, j, mask);
> - return 0;
> +// edma_shadow0_write_array(ctlr, SH_ESR, j, mask);
> +// return 0;
> }
>
> /* EDMA channel with event association */
>
Yes, this in fact works for me as well. Thanks for the quick reply! What
would be the proper fix for this?
Best,
Daniel
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