From: Sonic Zhang <sonic.zhang@xxxxxxxxxx> http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=2920 Fix by increasing buffer tail immediately before starting tx dma. Signed-off-by: Sonic Zhang <sonic.zhang@xxxxxxxxxx> Signed-off-by: Bryan Wu <bryan.wu@xxxxxxxxxx> --- drivers/serial/bfin_5xx.c | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c index 838f491..0074146 100644 --- a/drivers/serial/bfin_5xx.c +++ b/drivers/serial/bfin_5xx.c @@ -411,6 +411,10 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) set_dma_x_count(uart->tx_dma_channel, uart->tx_count); set_dma_x_modify(uart->tx_dma_channel, 1); enable_dma(uart->tx_dma_channel); + + xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); + uart->port.icount.tx += uart->tx_count; + #ifdef CONFIG_BF54x UART_SET_IER(uart, ETBEI); #else @@ -502,9 +506,6 @@ static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) ier &= ~ETBEI; UART_PUT_IER(uart, ier); #endif - xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1); - uart->port.icount.tx+=uart->tx_count; - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(&uart->port); -- 1.5.3.4 - To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
