diff options
Diffstat (limited to 'drivers/mxc/ipu/ipu_common.c')
| -rw-r--r-- | drivers/mxc/ipu/ipu_common.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/mxc/ipu/ipu_common.c b/drivers/mxc/ipu/ipu_common.c index 43ba100b5c5d..a1dc566e7f8f 100644 --- a/drivers/mxc/ipu/ipu_common.c +++ b/drivers/mxc/ipu/ipu_common.c @@ -707,6 +707,38 @@ int32_t ipu_select_buffer(ipu_channel_t channel, ipu_buffer_t type, } /*! + * This function check buffer ready for a logical channel. + * + * @param channel Input parameter for the logical channel ID. + * + * @param type Input parameter which buffer to clear. + * + * @param bufNum Input parameter for which buffer number clear + * ready state. + * + */ +int32_t ipu_check_buffer_busy(ipu_channel_t channel, ipu_buffer_t type, + uint32_t bufNum) +{ + uint32_t dma_chan = channel_2_dma(channel, type); + uint32_t reg; + + if (dma_chan == IDMA_CHAN_INVALID) + return -EINVAL; + + if (bufNum == 0) + reg = __raw_readl(IPU_CHA_BUF0_RDY); + else + reg = __raw_readl(IPU_CHA_BUF1_RDY); + + if (reg & (1UL << dma_chan)) + return 1; + else + return 0; +} +EXPORT_SYMBOL(ipu_check_buffer_busy); + +/*! * This function links 2 channels together for automatic frame * synchronization. The output of the source channel is linked to the input of * the destination channel. |