Commit d8c4a223 authored by Loic Poulain's avatar Loic Poulain Committed by Jakub Kicinski
Browse files

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: default avatarLoic Poulain <loic.poulain@linaro.org>
Reviewed-by: default avatarManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1604424234-24446-1-git-send-email-loic.poulain@linaro.org


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 5aee9484

drivers/bus/mhi/core/main.c

+11 −0
Original line number Diff line number Diff line
@@ -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)

include/linux/mhi.h

+7 −0
Original line number Diff line number Diff line
@@ -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_ */

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