hi,
On Mon, Nov 30, 2009 at 10:29:12AM +0100, ext Anand Gadiyar wrote:
@@ -175,6 +182,19 @@ static int dma_channel_program(struct dm
BUG_ON(channel->status == MUSB_DMA_STATUS_UNKNOWN ||
channel->status == MUSB_DMA_STATUS_BUSY);
+ /* In version 1.4, if two DMA channels are simultaneously
+ * enabled in opposite directions, there is a chance that
+ * the DMA controller will hang. However, it is safe to
+ * have multiple DMA channels enabled in the same direction
+ * at the same time.
+ */
+ if (musb->hwvers == MUSB_HWVERS_1400) {
+ if (musb_channel->transmit && controller->rx_active)
+ return false;
+ else if (!musb_channel->transmit && controller->tx_active)
+ return false;
how about returning error code here ?
--
balbi
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