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bus: mhi: core: Add an API for auto queueing buffers for DL channel

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Add a new API "mhi_prepare_for_transfer_autoqueue" for using with client
drivers like QRTR to request MHI core to autoqueue buffers for the DL
channel along with starting both UL and DL channels.

So far, the "auto_queue" flag specified by the controller drivers in
channel definition served this purpose but this will be removed at some
point in future.

Cc: netdev@vger.kernel.org
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Co-developed-by: Loic Poulain <loic.poulain@linaro.org>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20211216081227.237749-9-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manivannan Sadhasivam
2021-12-16 13:42:25 +05:30
committed by Greg Kroah-Hartman
parent d651ce8e91
commit 227fee5fc9
4 changed files with 39 additions and 11 deletions
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21
include/linux/mhi.h
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@@ -730,15 +730,26 @@ void mhi_device_put(struct mhi_device *mhi_dev);
/**
* mhi_prepare_for_transfer - Setup UL and DL channels for data transfer.
* Allocate and initialize the channel context and
* also issue the START channel command to both
* channels. Channels can be started only if both
* host and device execution environments match and
* channels are in a DISABLED state.
* @mhi_dev: Device associated with the channels
*
* Allocate and initialize the channel context and also issue the START channel
* command to both channels. Channels can be started only if both host and
* device execution environments match and channels are in a DISABLED state.
*/
int mhi_prepare_for_transfer(struct mhi_device *mhi_dev);
/**
* mhi_prepare_for_transfer_autoqueue - Setup UL and DL channels with auto queue
* buffers for DL traffic
* @mhi_dev: Device associated with the channels
*
* Allocate and initialize the channel context and also issue the START channel
* command to both channels. Channels can be started only if both host and
* device execution environments match and channels are in a DISABLED state.
* The MHI core will automatically allocate and queue buffers for the DL traffic.
*/
int mhi_prepare_for_transfer_autoqueue(struct mhi_device *mhi_dev);
/**
* mhi_unprepare_from_transfer - Reset UL and DL channels for data transfer.
* Issue the RESET channel command and let the