diff options
| author |   Loic Poulain <loic.poulain@linaro.org> | 2020-11-03 18:23:53 +0100 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2020-11-05 16:54:01 -0800 |
| commit | d8c4a22363853e196497b06a8ee9be9773873a14 (patch) | |
| tree | 48872e93240e08ae2cd9ed7bed33d1e2f65aa417 | |
| parent | Merge branch 'net-phy-add-support-for-shared-interrupts-part-1' (diff) | |
| download | linux-dev-d8c4a22363853e196497b06a8ee9be9773873a14.tar.xz linux-dev-d8c4a22363853e196497b06a8ee9be9773873a14.zip | |
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>
| -rw-r--r-- | drivers/bus/mhi/core/main.c | 11 | ||||
| -rw-r--r-- | include/linux/mhi.h | 7 |
2 files changed, 18 insertions, 0 deletions
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 2cff5ddff225..ba9e721d61b7 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -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) diff --git a/include/linux/mhi.h b/include/linux/mhi.h index d4841e5a5f45..b9bb7dff32e2 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -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_ */ |