tty: serial: samsung_tty: set dma burst_size to 1

commit f7e35e4bf1e8dc2c8cbd5e0955dc1bd58558dae0 upstream.

The src_maxburst and dst_maxburst have been changed to 1 but the settings
of the UCON register aren't changed yet. They should be changed as well
according to the dmaengine slave config.

Fixes: aa2f80e752c7 ("serial: samsung: fix maxburst parameter for DMA transactions")
Cc: stable <stable@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Link: https://lore.kernel.org/r/20220627065113.139520-1-chanho61.park@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 319533b..f460b47 100644 (file)
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -378,8 +378,7 @@ static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
        /* Enable tx dma mode */
        ucon = rd_regl(port, S3C2410_UCON);
        ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
-       ucon |= (dma_get_cache_alignment() >= 16) ?
-               S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
+       ucon |= S3C64XX_UCON_TXBURST_1;
        ucon |= S3C64XX_UCON_TXMODE_DMA;
        wr_regl(port,  S3C2410_UCON, ucon);
 
@@ -675,7 +674,7 @@ static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
                        S3C64XX_UCON_DMASUS_EN |
                        S3C64XX_UCON_TIMEOUT_EN |
                        S3C64XX_UCON_RXMODE_MASK);
-       ucon |= S3C64XX_UCON_RXBURST_16 |
+       ucon |= S3C64XX_UCON_RXBURST_1 |
                        0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
                        S3C64XX_UCON_EMPTYINT_EN |
                        S3C64XX_UCON_TIMEOUT_EN |