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Date:   Wed, 18 Oct 2023 09:52:55 +0800
From:   Qiang Yu <quic_qianyu@...cinc.com>
To:     Manivannan Sadhasivam <mani@...nel.org>
CC:     <quic_jhugo@...cinc.com>, <mhi@...ts.linux.dev>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_cang@...cinc.com>, <quic_mrana@...cinc.com>
Subject: Re: [PATCH] bus: mhi: host: pci_generic: Add SDX75 based modem
 support


On 10/17/2023 3:50 PM, Manivannan Sadhasivam wrote:
> On Wed, Aug 09, 2023 at 11:42:39AM +0800, Qiang Yu wrote:
>> On 8/8/2023 6:59 PM, Manivannan Sadhasivam wrote:
>>> On Tue, Aug 08, 2023 at 04:53:32PM +0800, Qiang Yu wrote:
>>>> On 8/8/2023 3:51 PM, Manivannan Sadhasivam wrote:
>>>>> On Tue, Aug 08, 2023 at 10:03:35AM +0800, Qiang Yu wrote:
>>>>>> Add generic info for SDX75 based modems. SDX75 takes longer than expected
>>>>>> (default, 8 seconds) to set ready after reboot. Hence add optional ready
>>>>>> timeout parameter to wait enough for device ready as part of power up
>>>>>> sequence.
>>>>>>
>>>>>> Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
>>>>>> ---
>>>>>>     drivers/bus/mhi/host/init.c        |  1 +
>>>>>>     drivers/bus/mhi/host/main.c        |  7 ++++++-
>>>>>>     drivers/bus/mhi/host/pci_generic.c | 22 ++++++++++++++++++++++
>>>>>>     drivers/bus/mhi/host/pm.c          |  6 +++++-
>>>>>>     include/linux/mhi.h                |  4 ++++
>>>>>>     5 files changed, 38 insertions(+), 2 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
>>>>>> index f78aefd..65ceac1 100644
>>>>>> --- a/drivers/bus/mhi/host/init.c
>>>>>> +++ b/drivers/bus/mhi/host/init.c
>>>>>> @@ -881,6 +881,7 @@ static int parse_config(struct mhi_controller *mhi_cntrl,
>>>>>>     	if (!mhi_cntrl->timeout_ms)
>>>>>>     		mhi_cntrl->timeout_ms = MHI_TIMEOUT_MS;
>>>>>> +	mhi_cntrl->ready_timeout_ms = config->ready_timeout_ms;
>>>>>>     	mhi_cntrl->bounce_buf = config->use_bounce_buf;
>>>>>>     	mhi_cntrl->buffer_len = config->buf_len;
>>>>>>     	if (!mhi_cntrl->buffer_len)
>>>>>> diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
>>>>>> index 74a7543..8590926 100644
>>>>>> --- a/drivers/bus/mhi/host/main.c
>>>>>> +++ b/drivers/bus/mhi/host/main.c
>>>>>> @@ -43,8 +43,13 @@ int __must_check mhi_poll_reg_field(struct mhi_controller *mhi_cntrl,
>>>>>>     				    u32 mask, u32 val, u32 delayus)
>>>>>>     {
>>>>>>     	int ret;
>>>>>> -	u32 out, retry = (mhi_cntrl->timeout_ms * 1000) / delayus;
>>>>>> +	u32 out, retry;
>>>>>> +	u32 timeout_ms = mhi_cntrl->timeout_ms;
>>>>>> +	if (mhi_cntrl->ready_timeout_ms && mask == MHISTATUS_READY_MASK)
>>>>>> +		timeout_ms = mhi_cntrl->ready_timeout_ms;
>>>>> Instead of handling the timeout inside mhi_poll_reg_field(), you should pass the
>>>>> appropriate timeout value to this function.
>>>> OK, will do.
>>>>>> +
>>>>>> +	retry = (timeout_ms * 1000) / delayus;
>>>>>>     	while (retry--) {
>>>>>>     		ret = mhi_read_reg_field(mhi_cntrl, base, offset, mask, &out);
>>>>>>     		if (ret)
>>>>>> diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
>>>>>> index fcd80bc..9c601f0 100644
>>>>>> --- a/drivers/bus/mhi/host/pci_generic.c
>>>>>> +++ b/drivers/bus/mhi/host/pci_generic.c
>>>>>> @@ -269,6 +269,16 @@ static struct mhi_event_config modem_qcom_v1_mhi_events[] = {
>>>>>>     	MHI_EVENT_CONFIG_HW_DATA(5, 2048, 101)
>>>>>>     };
>>>>>> +static const struct mhi_controller_config modem_qcom_v2_mhiv_config = {
>>>>>> +	.max_channels = 128,
>>>>>> +	.timeout_ms = 8000,
>>>>>> +	.ready_timeout_ms = 50000,
>>>>>> +	.num_channels = ARRAY_SIZE(modem_qcom_v1_mhi_channels),
>>>>>> +	.ch_cfg = modem_qcom_v1_mhi_channels,
>>>>>> +	.num_events = ARRAY_SIZE(modem_qcom_v1_mhi_events),
>>>>>> +	.event_cfg = modem_qcom_v1_mhi_events,
>>>>>> +};
>>>>>> +
>>>>>>     static const struct mhi_controller_config modem_qcom_v1_mhiv_config = {
>>>>>>     	.max_channels = 128,
>>>>>>     	.timeout_ms = 8000,
>>>>>> @@ -278,6 +288,16 @@ static const struct mhi_controller_config modem_qcom_v1_mhiv_config = {
>>>>>>     	.event_cfg = modem_qcom_v1_mhi_events,
>>>>>>     };
>>>>>> +static const struct mhi_pci_dev_info mhi_qcom_sdx75_info = {
>>>>>> +	.name = "qcom-sdx75m",
>>>>>> +	.fw = "qcom/sdx75m/xbl.elf",
>>>>>> +	.edl = "qcom/sdx75m/edl.mbn",
>>>>>> +	.config = &modem_qcom_v2_mhiv_config,
>>>>>> +	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
>>>>>> +	.dma_data_width = 32,
>>>>>> +	.sideband_wake = false,
>>>>>> +};
>>>>>> +
>>>>>>     static const struct mhi_pci_dev_info mhi_qcom_sdx65_info = {
>>>>>>     	.name = "qcom-sdx65m",
>>>>>>     	.fw = "qcom/sdx65m/xbl.elf",
>>>>>> @@ -597,6 +617,8 @@ static const struct pci_device_id mhi_pci_id_table[] = {
>>>>>>     		.driver_data = (kernel_ulong_t) &mhi_telit_fn990_info },
>>>>>>     	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0308),
>>>>>>     		.driver_data = (kernel_ulong_t) &mhi_qcom_sdx65_info },
>>>>>> +	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0309),
>>>>>> +		.driver_data = (kernel_ulong_t) &mhi_qcom_sdx75_info },
>>>>>>     	{ PCI_DEVICE(PCI_VENDOR_ID_QUECTEL, 0x1001), /* EM120R-GL (sdx24) */
>>>>>>     		.driver_data = (kernel_ulong_t) &mhi_quectel_em1xx_info },
>>>>>>     	{ PCI_DEVICE(PCI_VENDOR_ID_QUECTEL, 0x1002), /* EM160R-GL (sdx24) */
>>>>>> diff --git a/drivers/bus/mhi/host/pm.c b/drivers/bus/mhi/host/pm.c
>>>>>> index 8a4362d..6f049e0 100644
>>>>>> --- a/drivers/bus/mhi/host/pm.c
>>>>>> +++ b/drivers/bus/mhi/host/pm.c
>>>>>> @@ -1202,14 +1202,18 @@ EXPORT_SYMBOL_GPL(mhi_power_down);
>>>>>>     int mhi_sync_power_up(struct mhi_controller *mhi_cntrl)
>>>>>>     {
>>>>>>     	int ret = mhi_async_power_up(mhi_cntrl);
>>>>>> +	u32 timeout_ms;
>>>>>>     	if (ret)
>>>>>>     		return ret;
>>>>>> +	/* Some devices need more time to set ready during power up */
>>>>>> +	timeout_ms = mhi_cntrl->ready_timeout_ms ?
>>>>>> +		mhi_cntrl->ready_timeout_ms : mhi_cntrl->timeout_ms;
>>>>> Since you are using this extended timeout value in a couple of places (not just
>>>>> for checking READY_STATE), it is better to use the existing "timeout_ms"
>>>>> parameter.
>>>>>
>>>>> - Mani
>>>> We use ready_timeout_ms here is because READY_STATE is polled in a
>>>> workqueue,  in parallel with waiting valid EE.
>>>>
>>>> That means we start to wait valid EE and poll ready like at same time
>>>> instead of starting to wait EE after ready state.
>>>>
>>>> Thus the total time it takes to wait valid EE is about the time for polling
>>>> ready.
>>>>
>>> Yes, but why can't you still increase "timeout_ms" for SDX75 and use the same?
>>>
>>> Btw, please do not send another version while the discussion is going on for the
>>> current one.
>>>
>>> - Mani
>> SDX75 only needs 50 seconds when setting ready for the first time after
>> power on. Other state transitions
>>
>> is expected to wait only 8 seconds. If we use 50s for every state
>> transition, it's OK but not friendly in some cases.
>>
>>
>> For example, host is resuming from suspend, but device has already crashed
>> and tansferred to Sahara mode when
>>
>> in suspended state. Thus host must wait M0 event timeout, and then reinit
>> mhi and tranfer to SBL state in recovery
>>
>> process. If we set mhi_cntrl->timeout_ms=50s, we have to wait 50s to collect
>> crash dump after seeing resume fail log.
>>
> Hmm. Can't you fix the firmware? Taking 50s to bootup doesn't look good from
> user perspective.
>
> - Mani
  It is a firmware limitation and we can't fix it now.
>>>>>>     	wait_event_timeout(mhi_cntrl->state_event,
>>>>>>     			   MHI_IN_MISSION_MODE(mhi_cntrl->ee) ||
>>>>>>     			   MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state),
>>>>>> -			   msecs_to_jiffies(mhi_cntrl->timeout_ms));
>>>>>> +			   msecs_to_jiffies(timeout_ms));
>>>>>>     	ret = (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -ETIMEDOUT;
>>>>>>     	if (ret)
>>>>>> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
>>>>>> index f6de4b6..a43e5f8 100644
>>>>>> --- a/include/linux/mhi.h
>>>>>> +++ b/include/linux/mhi.h
>>>>>> @@ -266,6 +266,7 @@ struct mhi_event_config {
>>>>>>      * struct mhi_controller_config - Root MHI controller configuration
>>>>>>      * @max_channels: Maximum number of channels supported
>>>>>>      * @timeout_ms: Timeout value for operations. 0 means use default
>>>>>> + * @ready_timeout_ms: Timeout value for waiting device to be ready (optional)
>>>>>>      * @buf_len: Size of automatically allocated buffers. 0 means use default
>>>>>>      * @num_channels: Number of channels defined in @ch_cfg
>>>>>>      * @ch_cfg: Array of defined channels
>>>>>> @@ -277,6 +278,7 @@ struct mhi_event_config {
>>>>>>     struct mhi_controller_config {
>>>>>>     	u32 max_channels;
>>>>>>     	u32 timeout_ms;
>>>>>> +	u32 ready_timeout_ms;
>>>>>>     	u32 buf_len;
>>>>>>     	u32 num_channels;
>>>>>>     	const struct mhi_channel_config *ch_cfg;
>>>>>> @@ -326,6 +328,7 @@ struct mhi_controller_config {
>>>>>>      * @pm_mutex: Mutex for suspend/resume operation
>>>>>>      * @pm_lock: Lock for protecting MHI power management state
>>>>>>      * @timeout_ms: Timeout in ms for state transitions
>>>>>> + * @ready_timeout_ms: Timeout in ms for waiting device to be ready (optional)
>>>>>>      * @pm_state: MHI power management state
>>>>>>      * @db_access: DB access states
>>>>>>      * @ee: MHI device execution environment
>>>>>> @@ -413,6 +416,7 @@ struct mhi_controller {
>>>>>>     	struct mutex pm_mutex;
>>>>>>     	rwlock_t pm_lock;
>>>>>>     	u32 timeout_ms;
>>>>>> +	u32 ready_timeout_ms;
>>>>>>     	u32 pm_state;
>>>>>>     	u32 db_access;
>>>>>>     	enum mhi_ee_type ee;
>>>>>> -- 
>>>>>> 2.7.4
>>>>>>

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