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bus: mhi: Add mhi_queue_is_full function 

This function can be used by client driver to determine whether it's
possible to queue new elements in a channel ring.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1604424234-24446-1-git-send-email-loic.poulain@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Loic Poulain 2020-11-03 18:23:53 +01:00 committed by Jakub Kicinski
parent 5aee9484df
commit d8c4a22363
2 changed files with 18 additions and 0 deletions
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11
drivers/bus/mhi/core/main.c
View File

@ -1165,6 +1165,17 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir,
}
EXPORT_SYMBOL_GPL(mhi_queue_buf);
bool mhi_queue_is_full(struct mhi_device *mhi_dev, enum dma_data_direction dir)
{
struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
struct mhi_chan *mhi_chan = (dir == DMA_TO_DEVICE) ?
mhi_dev->ul_chan : mhi_dev->dl_chan;
struct mhi_ring *tre_ring = &mhi_chan->tre_ring;
return mhi_is_ring_full(mhi_cntrl, tre_ring);
}
EXPORT_SYMBOL_GPL(mhi_queue_is_full);
int mhi_send_cmd(struct mhi_controller *mhi_cntrl,
struct mhi_chan *mhi_chan,
enum mhi_cmd_type cmd)

7
include/linux/mhi.h
View File

@ -737,4 +737,11 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir,
int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir,
struct sk_buff *skb, size_t len, enum mhi_flags mflags);
/**
* mhi_queue_is_full - Determine whether queueing new elements is possible
* @mhi_dev: Device associated with the channels
* @dir: DMA direction for the channel
*/
bool mhi_queue_is_full(struct mhi_device *mhi_dev, enum dma_data_direction dir);
#endif /* _MHI_H_ */