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SubjectRe: [PATCH v2 1/6] bus: mhi: core: Allow receiving a STOP channel command response
Hi Mani,

On 2020-11-15 23:13, Manivannan Sadhasivam wrote:
> On Wed, Nov 11, 2020 at 11:21:08AM -0800, Bhaumik Bhatt wrote:
>> 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@codeaurora.org>
>> ---
>> 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) &&
>
> This enum is not defined in this patch so it'll break. Please add a
> separate
> patch which introduces the new state enums alone and then have patches
> 1/2
> as a followup.
>
It is actually already defined and present in internal.h as enum
mhi_ch_state.

The old set of enums has MHI_CH_STATE_STOP from enum mhi_ch_state and
the new
enum I introduced is MHI_CH_STATE_TYPE_STOP from enum enum
mhi_ch_state_type.

If it seems confusing, suggestions to renaming them are welcome.

> Also this change is not belonging to this commit I believe.
>
I included this change here because, a channel can be in "stopped" state
and
a user module could be unloaded or a crash could force a driver remove
leading
us to come this check.

If you think I should move it as a separate patch, let me know.
> Thanks,
> Mani
>
>> + !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;
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
>> Forum,
>> a Linux Foundation Collaborative Project
>>

Thanks,
Bhaumik
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
Forum,
a Linux Foundation Collaborative Project

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