Blackfin Serial Driver: handle irregular DMA register status in auto start mode

This bug is caused by irregular behavior of DMA register CURR_X_COUNT
and CURR_Y_COUNT when an auto restart uart rx DMA run to last byte in
DMA buffer, trigger the interrupt and stay at this possiton. The status
of current x and y is 0:7 instead of 512:8 or 0:8. The driver doesn't
take care of this case when calculating the position.

URL: http://blackfin.uclinux.org/gf/tracker/5063
Reported-by: Tomasz Motylewski <t.motylewski@bfad.de>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 676efda..854e96d 100644 (file)
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -490,7 +490,7 @@ void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
        uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
        x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
        uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
-       if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
+       if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
                uart->rx_dma_nrows = 0;
        x_pos = DMA_RX_XCOUNT - x_pos;
        if (x_pos == DMA_RX_XCOUNT)
@@ -546,15 +546,16 @@ static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 {
        struct bfin_serial_port *uart = dev_id;
        unsigned short irqstat;
-       int pos;
+       int x_pos, pos;
 
        spin_lock(&uart->port.lock);
        irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
        clear_dma_irqstat(uart->rx_dma_channel);
 
        uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
+       x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
        uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
-       if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
+       if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
                uart->rx_dma_nrows = 0;
 
        pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;