| Message ID | 1605566782-38013-2-git-send-email-hemantk@codeaurora.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | userspace MHI client interface driver | expand |
On Mon, 16 Nov 2020 at 23:46, Hemant Kumar <hemantk@codeaurora.org> wrote: > > 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> In case this series get new comments to address, I would suggest merging that patch in mhi-next separately so that other drivers can start benefiting this function (I would like to use it in mhi-net). Regards, Loic
On Wed, Nov 18, 2020 at 10:32:45AM +0100, Loic Poulain wrote: > On Mon, 16 Nov 2020 at 23:46, Hemant Kumar <hemantk@codeaurora.org> wrote: > > > > 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> > > In case this series get new comments to address, I would suggest > merging that patch in mhi-next separately so that other drivers can > start benefiting this function (I would like to use it in mhi-net). > Greg doesn't like that. He asked me to pick APIs only when there an in-tree consumer available. Thanks, Mani > Regards, > Loic
On Sat, Nov 28, 2020 at 11:59:46AM +0530, Manivannan Sadhasivam wrote: > On Wed, Nov 18, 2020 at 10:32:45AM +0100, Loic Poulain wrote: > > On Mon, 16 Nov 2020 at 23:46, Hemant Kumar <hemantk@codeaurora.org> wrote: > > > > > > 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> > > > > In case this series get new comments to address, I would suggest > > merging that patch in mhi-next separately so that other drivers can > > start benefiting this function (I would like to use it in mhi-net). > > > > Greg doesn't like that. He asked me to pick APIs only when there an in-tree > consumer available. If someone wants to use it, then yes, by all means merge it. I can't just take new apis without any user. thanks, greg k-h
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index f953e2a..6158720 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -260,6 +260,18 @@ 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 52b3c60..a4d0f48 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -597,6 +597,15 @@ 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