Re: [PATCH] bus: mhi: core: Add support MHI EE FP for download firmware
From: Bhaumik Bhatt
Date: Thu Oct 29 2020 - 14:17:20 EST
On 2020-10-29 02:26, Carl Yin wrote:
On October 28, 2020 7:02 AM, hemantk wrote:
Hi Jeff,
On 10/27/20 8:11 AM, Jeffrey Hugo wrote:
> On 10/27/2020 3:43 AM, 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. wwan modem normal bootup and enter EE AMSS, create mhi DIAG chan
>> device 2. send EDL cmd via DIAG chan, then modem enter EE EDL 3.
>> boot.c download 'firehose/prog_firehose_sdx55.mbn' via BHI interface
>> 4. modem enter EE FP, and create mhi EDL chan device 5. user space
>> tool download FW to modem via EDL chan by firehose protocol
>>
>> Signed-off-by: carl.yin <carl.yin@xxxxxxxxxxx>
>> ---
>> drivers/bus/mhi/core/boot.c | 4 +++-
>> drivers/bus/mhi/core/init.c | 2 ++
>> drivers/bus/mhi/core/internal.h | 1 +
>> drivers/bus/mhi/core/main.c | 3 +++
>> drivers/bus/mhi/core/pm.c | 16 +++++++++++++++-
>> include/linux/mhi.h | 4 +++-
>> 6 files changed, 27 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/bus/mhi/core/boot.c
>> b/drivers/bus/mhi/core/boot.c index 24422f5..ab39ad6 100644
>> --- a/drivers/bus/mhi/core/boot.c
>> +++ b/drivers/bus/mhi/core/boot.c
>> @@ -460,8 +460,10 @@ void mhi_fw_load_handler(struct mhi_controller
>> *mhi_cntrl)
>> return;
>> }
>> - if (mhi_cntrl->ee == MHI_EE_EDL)
>> + if (mhi_cntrl->ee == MHI_EE_EDL) {
>> + mhi_ready_state_transition(mhi_cntrl);
>> return;
>> + }
>> write_lock_irq(&mhi_cntrl->pm_lock);
>> mhi_cntrl->dev_state = MHI_STATE_RESET; diff --git
>> a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index
>> ac4aa5c..9c2c2f3 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] = "FP",
>> [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] = "FP",
>> [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..e307b58 100644
>> --- a/drivers/bus/mhi/core/main.c
>> +++ b/drivers/bus/mhi/core/main.c
>> @@ -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;
>> 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..3c95a5d 100644
>> --- a/drivers/bus/mhi/core/pm.c
>> +++ b/drivers/bus/mhi/core/pm.c
>> @@ -563,7 +563,15 @@ static void mhi_pm_disable_transition(struct
>> mhi_controller *mhi_cntrl,
>> }
>> if (cur_state == MHI_PM_SYS_ERR_PROCESS) {
>> - mhi_ready_state_transition(mhi_cntrl);
>> + if (mhi_get_exec_env(mhi_cntrl) == MHI_EE_EDL
>> + && mhi_get_mhi_state(mhi_cntrl) == MHI_STATE_RESET) {
>> + write_lock_irq(&mhi_cntrl->pm_lock);
>> + cur_state = mhi_tryset_pm_state(mhi_cntrl,
MHI_PM_POR);
>> + write_unlock_irq(&mhi_cntrl->pm_lock);
>> + mhi_queue_state_transition(mhi_cntrl,
>> DEV_ST_TRANSITION_PBL);
>> + } else {
>> + mhi_ready_state_transition(mhi_cntrl);
>> + }
>> } else {
>> /* Move to disable state */
>> write_lock_irq(&mhi_cntrl->pm_lock);
>> @@ -658,6 +666,12 @@ 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;
>> 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,
>>
>
> This gets a NACK from me. I don't see the FP_EE that this patch
> introduces defined in the spec. Where did it come from?
>
There is indeed a FP EE, BHI spec will be updated with this EE next
month.
Basically, once device goes to EDL, flash programmer image is
downloaded using
BHI protocol (same as we download SBL image using BHI from PBL in
current use
case). Once it is downloaded intvec sends EE change event for FP. Also
event is
generated for the same which is used to create EDL channels (34, 35)
which is
used by flash programmer to flash image for AMSS.
>> 2. send EDL cmd via DIAG chan, then modem enter EE EDL
#2 needs to be done in cleaner way. From AMSS when diag cmd is sent to
switch
to EDL, device would send SYS_ERR which we can use to do a call back
to mhi
controller to perform power down and power up. Instead of moving pm
state to
POR from disable transition :-
[carl.yin] why I need move pm_state to POR, it is because if pm_state
is SYS_ERR,
mhi_fw_load_handler() will break, and will not download edl image to
device.
We can change pm.c as next, and revert the change to boot.c
if (cur_state == MHI_PM_SYS_ERR_PROCESS) {
if (mhi_get_exec_env(mhi_cntrl) == MHI_EE_EDL
&& mhi_get_mhi_state(mhi_cntrl) == MHI_STATE_RESET) {
write_lock_irq(&mhi_cntrl->pm_lock);
mhi_cntrl->ee = MHI_EE_EDL;
write_unlock_irq(&mhi_cntrl->pm_lock);
mhi_fw_load_handler(mhi_cntrl);
}
mhi_ready_state_transition(mhi_cntrl);
}
With the explanation from my previous email, you don't need this any
more.
@@ -563,7 +563,15 @@ static void mhi_pm_disable_transition(struct >>
mhi_controller *mhi_cntrl,
>> }
>> if (cur_state == MHI_PM_SYS_ERR_PROCESS) {
>> - mhi_ready_state_transition(mhi_cntrl);
>> + if (mhi_get_exec_env(mhi_cntrl) == MHI_EE_EDL
>> + && mhi_get_mhi_state(mhi_cntrl) == MHI_STATE_RESET) {
>> + write_lock_irq(&mhi_cntrl->pm_lock);
>> + cur_state = mhi_tryset_pm_state(mhi_cntrl,
MHI_PM_POR);
>> + write_unlock_irq(&mhi_cntrl->pm_lock);
>> + mhi_queue_state_transition(mhi_cntrl,
>> DEV_ST_TRANSITION_PBL);
>> + } else {
>> + mhi_ready_state_transition(mhi_cntrl);
>> + }
Thanks,
Hemant
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Forum, a
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Thanks,
Bhaumik
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
Forum,
a Linux Foundation Collaborative Project