diff options
| -rw-r--r-- | arch/arm/mach-tegra/dma.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/dma.c b/arch/arm/mach-tegra/dma.c index 0cc97b707417..9e62051917ef 100644 --- a/arch/arm/mach-tegra/dma.c +++ b/arch/arm/mach-tegra/dma.c @@ -628,6 +628,39 @@ static void handle_continuous_dma(struct tegra_dma_channel *ch) req = list_entry(ch->list.next, typeof(*req), node); if (req) { if (req->buffer_status == TEGRA_DMA_REQ_BUF_STATUS_EMPTY) { + bool is_dma_ping_complete; + is_dma_ping_complete = (readl(ch->addr + APB_DMA_CHAN_STA) + & STA_PING_PONG) ? true : false; + if( req->to_memory ) + is_dma_ping_complete = !is_dma_ping_complete; + /* Out of sync - Release current buffer */ + if( !is_dma_ping_complete ) { + int bytes_transferred; + + bytes_transferred = + (ch->csr & CSR_WCOUNT_MASK) >> CSR_WCOUNT_SHIFT; + bytes_transferred += 1; + bytes_transferred <<= 3; + req->buffer_status = TEGRA_DMA_REQ_BUF_STATUS_FULL; + req->bytes_transferred = bytes_transferred; + req->status = TEGRA_DMA_REQ_SUCCESS; + tegra_dma_stop(ch); + + if (!list_is_last(&req->node, &ch->list)) { + struct tegra_dma_req *next_req; + + next_req = list_entry(req->node.next, + typeof(*next_req), node); + tegra_dma_update_hw(ch, next_req); + } + + list_del(&req->node); + + /* DMA lock is NOT held when callbak is called */ + spin_unlock(&ch->lock); + req->complete(req); + return; + } /* Load the next request into the hardware, if available * */ if (!list_is_last(&req->node, &ch->list)) { |