lkml.org 
[lkml]   [2021]   [Feb]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v6 7/8] bus: mhi: Improve documentation on channel transfer setup APIs
Date
The mhi_prepare_for_transfer() and mhi_unprepare_from_transfer()
APIs could use better explanation. Add details on what MHI does
when these APIs are used.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
---
include/linux/mhi.h | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index d26acc8..56c4c52 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -712,13 +712,27 @@ int mhi_device_get_sync(struct mhi_device *mhi_dev);
void mhi_device_put(struct mhi_device *mhi_dev);

/**
- * mhi_prepare_for_transfer - Setup channel for data transfer
+ * 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
*/
int mhi_prepare_for_transfer(struct mhi_device *mhi_dev);

/**
- * mhi_unprepare_from_transfer - Unprepare the channels
+ * mhi_unprepare_from_transfer - Reset UL and DL channels for data transfer.
+ * Issue the RESET channel command and let the
+ * device clean-up the context so no incoming
+ * transfers are seen on the host. Free memory
+ * associated with the context on host. If device
+ * is unresponsive, only perform a host side
+ * clean-up. Channels can be reset only if both
+ * host and device execution environments match
+ * and channels are in an ENABLED, STOPPED or
+ * SUSPENDED state.
* @mhi_dev: Device associated with the channels
*/
void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
\
 
 \ /
  Last update: 2021-02-04 21:39    [W:0.162 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site