| Message ID | 1600286167-4432-2-git-send-email-hemantk@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | user space client interface driver | expand |
On Wed, Sep 16, 2020 at 12:56:04PM -0700, Hemant Kumar wrote: > Introduce mhi_get_no_free_descriptors() 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> > --- > drivers/bus/mhi/core/main.c | 12 ++++++++++++ > include/linux/mhi.h | 9 +++++++++ > 2 files changed, 21 insertions(+) > > diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c > index 2cff5dd..0599e7d 100644 > --- a/drivers/bus/mhi/core/main.c > +++ b/drivers/bus/mhi/core/main.c > @@ -258,6 +258,18 @@ int mhi_destroy_device(struct device *dev, void *data) > return 0; > } > > +int mhi_get_no_free_descriptors(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); Hmm, so this is essentially a wrapper for get_nr_avail_ring_elements(). Why can't you call this API directly? > +} > +EXPORT_SYMBOL_GPL(mhi_get_no_free_descriptors); > + > 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 a35d876..6565528 100644 > --- a/include/linux/mhi.h > +++ b/include/linux/mhi.h > @@ -600,6 +600,15 @@ 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_no_free_descriptors - Get transfer ring length mhi_get_nr_free_descriptors? > + * Get # of TD available to queue buffers > + * @mhi_dev: Device associated with the channels > + * @dir: Direction of the channel > + */ > +int mhi_get_no_free_descriptors(struct mhi_device *mhi_dev, > + enum dma_data_direction dir); Align enum with start of "(" Thanks, Mani > + > +/** > * 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 > -- > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project >
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 2cff5dd..0599e7d 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -258,6 +258,18 @@ int mhi_destroy_device(struct device *dev, void *data) return 0; } +int mhi_get_no_free_descriptors(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_no_free_descriptors); + 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 a35d876..6565528 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -600,6 +600,15 @@ 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_no_free_descriptors - 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_no_free_descriptors(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
Introduce mhi_get_no_free_descriptors() 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> --- drivers/bus/mhi/core/main.c | 12 ++++++++++++ include/linux/mhi.h | 9 +++++++++ 2 files changed, 21 insertions(+)