| Message ID | 1610385379-15140-1-git-send-email-loic.poulain@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [net-next,1/3] bus: mhi: core: Add helper API to return number of free TREs | expand |
On Mon, 11 Jan 2021 18:16:17 +0100 Loic Poulain wrote: > From: Hemant Kumar <hemantk@codeaurora.org> > > Introduce mhi_get_free_desc_count() API to return number > of TREs available to queue buffer. MHI clients can use this > API to know before hand if ring is full without calling queue > API. > > Signed-off-by: Hemant Kumar <hemantk@codeaurora.org> > Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> You put net-next in the subject but this is not CCed to netdev. What's the intention?
On Mon, 11 Jan 2021 at 18:28, Jakub Kicinski <kuba@kernel.org> wrote: > > On Mon, 11 Jan 2021 18:16:17 +0100 Loic Poulain wrote: > > From: Hemant Kumar <hemantk@codeaurora.org> > > > > Introduce mhi_get_free_desc_count() API to return number > > of TREs available to queue buffer. MHI clients can use this > > API to know before hand if ring is full without calling queue > > API. > > > > Signed-off-by: Hemant Kumar <hemantk@codeaurora.org> > > Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org> > > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > > You put net-next in the subject but this is not CCed to netdev. > What's the intention? Oops, thanks for noticing that, going to resubmit. Regards, Loic
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 3db1108..4e31f4f 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -309,6 +309,18 @@ int mhi_destroy_device(struct device *dev, void *data) return 0; } +int mhi_get_free_desc_count(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 get_nr_avail_ring_elements(mhi_cntrl, tre_ring); +} +EXPORT_SYMBOL_GPL(mhi_get_free_desc_count); + void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason) { struct mhi_driver *mhi_drv; diff --git a/include/linux/mhi.h b/include/linux/mhi.h index cd571ad..62da830 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -614,6 +614,15 @@ void mhi_set_mhi_state(struct mhi_controller *mhi_cntrl, void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason); /** + * mhi_get_free_desc_count - Get transfer ring length + * Get # of TD available to queue buffers + * @mhi_dev: Device associated with the channels + * @dir: Direction of the channel + */ +int mhi_get_free_desc_count(struct mhi_device *mhi_dev, + enum dma_data_direction dir); + +/** * mhi_prepare_for_power_up - Do pre-initialization before power up. * This is optional, call this before power up if * the controller does not want bus framework to