[PATCH v1 1/4] bus: mhi: core: Allow receiving a STOP channel command response

From: Bhaumik Bhatt
Date: Mon Nov 09 2020 - 17:44:42 EST


Add support to receive the response to a STOP channel command to the
MHI bus. If a client would like to STOP a channel instead of issuing
a RESET to it, this would provide support for it.

Signed-off-by: Bhaumik Bhatt <bbhatt@xxxxxxxxxxxxxx>
---
drivers/bus/mhi/core/init.c | 5 +++--
drivers/bus/mhi/core/main.c | 5 +++++
2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 8cefa35..4d34d62 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -1267,8 +1267,9 @@ static int mhi_driver_remove(struct device *dev)

mutex_lock(&mhi_chan->mutex);

- if (ch_state[dir] == MHI_CH_STATE_ENABLED &&
- !mhi_chan->offload_ch)
+ if ((ch_state[dir] == MHI_CH_STATE_ENABLED ||
+ ch_state[dir] == MHI_CH_STATE_STOP) &&
+ !mhi_chan->offload_ch)
mhi_deinit_chan_ctxt(mhi_cntrl, mhi_chan);

mhi_chan->ch_state = MHI_CH_STATE_DISABLED;
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index f953e2a..ad881a1 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -1194,6 +1194,11 @@ int mhi_send_cmd(struct mhi_controller *mhi_cntrl,
cmd_tre->dword[0] = MHI_TRE_CMD_RESET_DWORD0;
cmd_tre->dword[1] = MHI_TRE_CMD_RESET_DWORD1(chan);
break;
+ case MHI_CMD_STOP_CHAN:
+ cmd_tre->ptr = MHI_TRE_CMD_STOP_PTR;
+ cmd_tre->dword[0] = MHI_TRE_CMD_STOP_DWORD0;
+ cmd_tre->dword[1] = MHI_TRE_CMD_STOP_DWORD1(chan);
+ break;
case MHI_CMD_START_CHAN:
cmd_tre->ptr = MHI_TRE_CMD_START_PTR;
cmd_tre->dword[0] = MHI_TRE_CMD_START_DWORD0;
--
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