Hi bbhatt:
On November 04, 2020 1:32 AM, bbhatt wrote:
> On 2020-11-02 17:47, Carl Yin wrote:
> > Hi bbhatt:
> >
> > On November 03, 2020 12:34 AM, Bhatt wrote:
> >> On 2020-11-02 04:27, carl.yin@xxxxxxxxxxx wrote:
> >> > From: "carl.yin" <carl.yin@xxxxxxxxxxx>
> >> >
> >> > MHI wwan modems support download firmware to nand or emmc by
> >> > firehose protocol, process as next:
> >> > 1. modem boot up and enter EE AMSS, create DIAG channels (4, 5)
> >> > device 2. user space tool send EDL command via DIAG channel,
> >> > then modem enter EE EDL
> >> > 3. boot.c download 'flash programmer image' via BHI interface 4.
> >> > modem enter EE FP, and create EDL channels (34, 35) device 5. user
> >> > space tool download 'firmware image' to modem via EDL channels
> >> > by firehose protocol
> >> >
> >> > Signed-off-by: carl.yin <carl.yin@xxxxxxxxxxx>
[carl.yin] can you give some advice one above commit message? I am afraid it is clear and brief.
> >> > ---
> >> > drivers/bus/mhi/core/init.c | 2 ++
> >> > drivers/bus/mhi/core/internal.h | 1 +
> >> > drivers/bus/mhi/core/main.c | 5 ++++-
> >> > drivers/bus/mhi/core/pm.c | 13 ++++++++++++-
> >> > include/linux/mhi.h | 4 +++-
> >> > 5 files changed, 22 insertions(+), 3 deletions(-)
> >> >
> >> > diff --git a/drivers/bus/mhi/core/init.c
> >> > b/drivers/bus/mhi/core/init.c index ac4aa5c..e34616b 100644
> >> > --- a/drivers/bus/mhi/core/init.c
> >> > +++ b/drivers/bus/mhi/core/init.c
> >> > @@ -26,6 +26,7 @@ const char * const mhi_ee_str[MHI_EE_MAX] = {
> >> > [MHI_EE_WFW] = "WFW",
> >> > [MHI_EE_PTHRU] = "PASS THRU",
> >> > [MHI_EE_EDL] = "EDL",
> >> > + [MHI_EE_FP] = "FLASH PROGRAMMER",
> >> > [MHI_EE_DISABLE_TRANSITION] = "DISABLE",
> >> > [MHI_EE_NOT_SUPPORTED] = "NOT SUPPORTED", }; @@ -35,6 +36,7
> @@
> >> > const char * const dev_state_tran_str[DEV_ST_TRANSITION_MAX] = {
> >> > [DEV_ST_TRANSITION_READY] = "READY",
> >> > [DEV_ST_TRANSITION_SBL] = "SBL",
> >> > [DEV_ST_TRANSITION_MISSION_MODE] = "MISSION_MODE",
> >> > + [DEV_ST_TRANSITION_FP] = "FLASH_PROGRAMMER",
> >> > [DEV_ST_TRANSITION_SYS_ERR] = "SYS_ERR",
> >> > [DEV_ST_TRANSITION_DISABLE] = "DISABLE", }; diff --git
> >> > a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
> >> > index 4abf0cf..6ae897a 100644
> >> > --- a/drivers/bus/mhi/core/internal.h
> >> > +++ b/drivers/bus/mhi/core/internal.h
> >> > @@ -386,6 +386,7 @@ enum dev_st_transition {
> >> > DEV_ST_TRANSITION_READY,
> >> > DEV_ST_TRANSITION_SBL,
> >> > DEV_ST_TRANSITION_MISSION_MODE,
> >> > + DEV_ST_TRANSITION_FP,
> >> > DEV_ST_TRANSITION_SYS_ERR,
> >> > DEV_ST_TRANSITION_DISABLE,
> >> > DEV_ST_TRANSITION_MAX,
> >> > diff --git a/drivers/bus/mhi/core/main.c
> >> > b/drivers/bus/mhi/core/main.c index 3950792..a1e1561 100644
> >> > --- a/drivers/bus/mhi/core/main.c
> >> > +++ b/drivers/bus/mhi/core/main.c
> >> > @@ -422,7 +422,7 @@ irqreturn_t mhi_intvec_threaded_handler(int
> >> > irq_number, void *priv)
> >> > wake_up_all(&mhi_cntrl->state_event);
> >> >
> >> > /* For fatal errors, we let controller decide next step */
> >> > - if (MHI_IN_PBL(ee))
> >> > + if (MHI_IN_PBL(mhi_cntrl->ee))
> >> Let's please have this as a separate patch with a fixes tag, as it
> >> fixes a pre-existing bug. I am sure Mani would want this.
[carl.yin] should I wait this bug fixed, then submit patch v3?
> >> > mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_FATAL_ERROR);
> >> > else
> >> > mhi_pm_sys_err_handler(mhi_cntrl);
> >> > @@ -782,6 +782,9 @@ int mhi_process_ctrl_ev_ring(struct
> >> > mhi_controller *mhi_cntrl,
> >> > case MHI_EE_SBL:
> >> > st = DEV_ST_TRANSITION_SBL;
> >> > break;
> >> > + case MHI_EE_FP:
> >> > + st = DEV_ST_TRANSITION_FP;
> >> > + break;
> >> When do you get this EE event on the control event ring? Does it come
> >> by after you have detected EE as FP from mhi_sync_power_up() and move
> >> to ready and then M0?
> > [carl.yin] it is from the log, next is the sdx24's log.
> > Another thing, I find mhi controller's status_cb() should not directly
> > call mhi_power_down(), The function stack is
> >
> mhi_intvec_threaded_handler()->status_cb()->mhi_power_down()->free_irq().
> > Should not free irq in the irq thread.
> >
> > [ 304.263111] mhi 0000:03:00.0: Preparing channel: 4 [ 304.275580]
> > mhi 0000:03:00.0: Chan: 4 successfully moved to start state [
> > 304.275580] mhi 0000:03:00.0: Preparing channel: 5 [ 304.285901] mhi
> > 0000:03:00.0: Chan: 5 successfully moved to start state [ 307.380999]
> > mhi 0000:03:00.0: local ee:EDL device ee:AMSS dev_state:SYS_ERR [
> > 307.381000] mhi 0000:03:00.0: System error detected [ 307.381001]
> > mhi-pci-generic 0000:03:00.0: mhi_pci_status_cb ee=6,
> > cb=7
> > [ 307.381006] mhi 0000:03:00.0: Handling state transition: DISABLE [
> > 307.381007] mhi 0000:03:00.0: Transitioning from PM state: SYS_ERR
> > Detect to: SHUTDOWN Process [ 307.381008] mhi 0000:03:00.0:
> > Triggering MHI Reset in device [ 307.381114] mhi 0000:03:00.0: local
> > ee:EDL device ee:DISABLE dev_state:RESET [ 307.381120] mhi
> > 0000:03:00.0: Waiting for all pending event ring processing to
> > complete [ 307.381120] mhi 0000:03:00.0: Waiting for all pending
> > threads to complete [ 307.381121] mhi 0000:03:00.0: Reset all active
> > channels and remove MHI devices ......
> > [ 307.402279] mhi 0000:03:00.0: Resetting EV CTXT and CMD CTXT [
> > 307.402280] mhi 0000:03:00.0: Exiting with PM state: DISABLE, MHI
> > state: RESET
> > [ 307.402567] mhi 0000:03:00.0: Requested to power ON [ 307.402845]
> > mhi 0000:03:00.0: Power on setup success [ 307.402847] mhi
> > 0000:03:00.0: Handling state transition: PBL [ 307.402985] mhi
> > 0000:03:00.0: Starting SBL download via BHI.
> > Session ID:1048927456
> > [ 307.435259] mhi 0000:03:00.0: local ee:EDL device ee:EDL
> > dev_state:RESET [ 308.460322] mhi 0000:03:00.0: local ee:FLASH
> > PROGRAMMER device ee:EDL dev_state:READY [ 308.460326] mhi
> > 0000:03:00.0: Handling state transition: READY [ 308.460335] mhi
> > 0000:03:00.0: Device in READY State [ 308.460335] mhi 0000:03:00.0:
> > Initializing MHI registers [ 308.464301] mhi 0000:03:00.0: State
> > change event to state: M0 [ 308.465303] mhi 0000:03:00.0: Received EE
> > event: FLASH PROGRAMMER [ 308.465311] mhi 0000:03:00.0: Handling
> > state transition:
> > FLASH_PROGRAMMER
> > [ 309.381506] mhi 0000:03:00.0: Preparing channel: 34 [ 309.384631]
> > mhi 0000:03:00.0: Chan: 34 successfully moved to start state [
> > 309.384631] mhi 0000:03:00.0: Preparing channel: 35 [ 309.387910] mhi
> > 0000:03:00.0: Chan: 35 successfully moved to start state
> >
> Yes, you should not call mhi_power_down() from the status_cb() directly.
> It is a
> blocking function which should not called from a threaded IRQ handler, if possible
> and it also ends up freeing the IRQ from the handler itself which should not be
> done. Can you spawn a separate thread to do this work?
> >> > case MHI_EE_WFW:
> >> > case MHI_EE_AMSS:
> >> > st = DEV_ST_TRANSITION_MISSION_MODE; diff --git
> >> > a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index
> >> > 3de7b16..2d68812 100644
> >> > --- a/drivers/bus/mhi/core/pm.c
> >> > +++ b/drivers/bus/mhi/core/pm.c
> >> > @@ -658,6 +658,12 @@ void mhi_pm_st_worker(struct work_struct *work)
> >> > case DEV_ST_TRANSITION_MISSION_MODE:
> >> > mhi_pm_mission_mode_transition(mhi_cntrl);
> >> > break;
> >> > + case DEV_ST_TRANSITION_FP:
> >> > + write_lock_irq(&mhi_cntrl->pm_lock);
> >> > + mhi_cntrl->ee = MHI_EE_FP;
> >> > + write_unlock_irq(&mhi_cntrl->pm_lock);
> >> > + mhi_create_devices(mhi_cntrl);
> >> > + break;
> >> > case DEV_ST_TRANSITION_READY:
> >> > mhi_ready_state_transition(mhi_cntrl);
> >> > break;
> >> > @@ -1077,10 +1083,15 @@ int mhi_sync_power_up(struct mhi_controller
> >> > *mhi_cntrl)
> >> >
> >> > wait_event_timeout(mhi_cntrl->state_event,
> >> > MHI_IN_MISSION_MODE(mhi_cntrl->ee) ||
> >> > + mhi_cntrl->ee == MHI_EE_FP ||
> >> > MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state),
> >> > msecs_to_jiffies(mhi_cntrl->timeout_ms));
> >> >
> >> > - ret = (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -ETIMEDOUT;
> >> > + if (mhi_cntrl->ee == MHI_EE_FP)
> >> > + mhi_queue_state_transition(mhi_cntrl,
> >> DEV_ST_TRANSITION_READY);
> >> > + else
> >> > + ret = (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 :
> -ETIMEDOUT;
> >> > +
> >> > if (ret)
> >> > mhi_power_down(mhi_cntrl, false);
> >> >
> >> We should come up with a better design for this later on.
[carl.yin] I move sync_power_up() to aysnc_power_up(), so modifies in this function is not need.
for I found some time the "wait" will block long time. "long time block" is not accept by other device's drivers.
I do the transition of EDL -> FP in next function.
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -406,6 +406,9 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *priv)
dev_dbg(dev, "System error detected\n");
pm_state = mhi_tryset_pm_state(mhi_cntrl,
MHI_PM_SYS_ERR_DETECT);
+ } else if (state == MHI_STATE_READY) {
+ if (ee == MHI_EE_EDL && mhi_cntrl->ee == MHI_EE_FP)
+ mhi_queue_state_transition(mhi_cntrl, DEV_ST_TRANSITION_READY);
}
write_unlock_irq(&mhi_cntrl->pm_lock);
and it also works well, next is the log.
[ 1048.424679] mhi 0000:03:00.0: Exiting with PM state: DISABLE, MHI state: RESET
[ 1048.424743] mhi 0000:03:00.0: Requested to power ON
[ 1048.424885] mhi 0000:03:00.0: Power on setup success
[ 1048.424887] mhi 0000:03:00.0: Handling state transition: PBL
[ 1048.425034] mhi 0000:03:00.0: Starting SBL download via BHI. Session ID:584611751
[ 1048.446610] mhi 0000:03:00.0: local ee:EDL device ee:EDL dev_state:RESET
[ 1049.469896] mhi 0000:03:00.0: local ee:FLASH PROGRAMMER device ee:EDL dev_state:READY
[ 1049.469919] mhi 0000:03:00.0: Handling state transition: READY
[ 1049.469930] mhi 0000:03:00.0: Device in READY State
[ 1049.469933] mhi 0000:03:00.0: Initializing MHI registers
[ 1049.473818] mhi 0000:03:00.0: State change event to state: M0
[ 1049.474850] mhi 0000:03:00.0: Received EE event: FLASH PROGRAMMER
[ 1049.474888] mhi 0000:03:00.0: Handling state transition: FLASH_PROGRAMMER
[ 1050.402805] mhi 0000:03:00.0: Preparing channel: 34
[ 1050.406175] mhi 0000:03:00.0: Chan: 34 successfully moved to start state
> >> > diff --git a/include/linux/mhi.h b/include/linux/mhi.h index
> >> > 6e1122c..4620af8 100644
> >> > --- a/include/linux/mhi.h
> >> > +++ b/include/linux/mhi.h
> >> > @@ -120,6 +120,7 @@ struct mhi_link_info {
> >> > * @MHI_EE_WFW: WLAN firmware mode
> >> > * @MHI_EE_PTHRU: Passthrough
> >> > * @MHI_EE_EDL: Embedded downloader
> >> > + * @MHI_EE_FP, Flash Programmer Environment
> >> > */
> >> > enum mhi_ee_type {
> >> > MHI_EE_PBL,
> >> > @@ -129,7 +130,8 @@ enum mhi_ee_type {
> >> > MHI_EE_WFW,
> >> > MHI_EE_PTHRU,
> >> > MHI_EE_EDL,
> >> > - MHI_EE_MAX_SUPPORTED = MHI_EE_EDL,
> >> > + MHI_EE_FP,
> >> > + MHI_EE_MAX_SUPPORTED = MHI_EE_FP,
> >> > MHI_EE_DISABLE_TRANSITION, /* local EE, not related to mhi spec */
> >> > MHI_EE_NOT_SUPPORTED,
> >> > MHI_EE_MAX,
> >>
> >> Thanks,
> >> Bhaumik
> >> --
> >> 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
