According to description about "Transmit Data Level", This bit field controls the level at which a DMA request is made by the transmit logic.
It is equal to the watermark level. That is, the dma_tx_req signal is generated when the number of valid data entries in the TXFIFO (TXFIFO0 if CSR=00 TXFIFO1 if CSR=01 TXFIFO2 if CSR=10 TXFIFO3 if CSR=11) is equal to or below this field value. Different to receive data level, transmit data level does not need to "-1". Signed-off-by: Jianqun Xu <jay...@rock-chips.com> --- sound/soc/rockchip/rockchip_i2s.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/soc/rockchip/rockchip_i2s.h b/sound/soc/rockchip/rockchip_i2s.h index 89a5d8b..93f456f 100644 --- a/sound/soc/rockchip/rockchip_i2s.h +++ b/sound/soc/rockchip/rockchip_i2s.h @@ -127,7 +127,7 @@ #define I2S_DMACR_TDE_DISABLE (0 << I2S_DMACR_TDE_SHIFT) #define I2S_DMACR_TDE_ENABLE (1 << I2S_DMACR_TDE_SHIFT) #define I2S_DMACR_TDL_SHIFT 0 -#define I2S_DMACR_TDL(x) ((x - 1) << I2S_DMACR_TDL_SHIFT) +#define I2S_DMACR_TDL(x) ((x) << I2S_DMACR_TDL_SHIFT) #define I2S_DMACR_TDL_MASK (0x1f << I2S_DMACR_TDL_SHIFT) /* -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
