diff options
| author | Pradeep Kumar <pgoudagunta@nvidia.com> | 2012-02-27 14:05:46 +0530 |
|---|---|---|
| committer | Simone Willett <swillett@nvidia.com> | 2012-02-29 17:04:19 -0800 |
| commit | dd33d027f8b7f8e809a0bed091fc68aef0460b68 (patch) | |
| tree | a33f6c47d631c2df1874813cdd0fc0c469349284 /drivers/tty | |
| parent | 9e69c4d626959f8a2509230127a282e9dc26bfff (diff) | |
tty: serial: tegra: Fix dma/cpu coherency issues
Call dma sync single api's to maintain coherency between
CPU, dma and device in data transfers.
Bug 935876
Bug 918880
Signed-off-by: Pradeep Kumar <pgoudagunta@nvidia.com>
Change-Id: I45d7d998b1d091e726c1bfb512c8b0b087d7452e
Reviewed-on: http://git-master/r/86054
Tested-by: Pradeep Goudagunta <pgoudagunta@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/tegra_hsuart.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/tty/serial/tegra_hsuart.c b/drivers/tty/serial/tegra_hsuart.c index 2d9cc200c7f7..fd68004a2765 100644 --- a/drivers/tty/serial/tegra_hsuart.c +++ b/drivers/tty/serial/tegra_hsuart.c @@ -263,6 +263,8 @@ static void tegra_start_tx(struct uart_port *u) static int tegra_start_dma_rx(struct tegra_uart_port *t) { wmb(); + dma_sync_single_for_device(t->uport.dev, t->rx_dma_req.dest_addr, + t->rx_dma_req.size, DMA_TO_DEVICE); if (tegra_dma_enqueue_req(t->rx_dma, &t->rx_dma_req)) { dev_err(t->uport.dev, "Could not enqueue Rx DMA req\n"); return -EINVAL; @@ -308,6 +310,8 @@ static void tegra_rx_dma_complete_callback(struct tegra_dma_req *req) req->status); if (req->bytes_transferred) { t->uport.icount.rx += req->bytes_transferred; + dma_sync_single_for_cpu(t->uport.dev, req->dest_addr, + req->size, DMA_FROM_DEVICE); copied = tty_insert_flip_string(tty, ((unsigned char *)(req->virt_addr)), req->bytes_transferred); @@ -317,6 +321,8 @@ static void tegra_rx_dma_complete_callback(struct tegra_dma_req *req) "to tty layer Req %d and coped %d\n", req->bytes_transferred, copied); } + dma_sync_single_for_device(t->uport.dev, req->dest_addr, + req->size, DMA_TO_DEVICE); } do_handle_rx_pio(t); |