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Date: Mon, 02 Nov 2020 08:34:14 -0800
From: Bhaumik Bhatt <bbhatt@...eaurora.org>
To: carl.yin@...ctel.com
Cc: manivannan.sadhasivam@...aro.org, hemantk@...eaurora.org,
sfr@...b.auug.org.au, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org, naveen.kumar@...ctel.com
Subject: Re: [PATCH v2] bus: mhi: core: Add support MHI EE FP for download
firmware
On 2020-11-02 04:27, carl.yin@...ctel.com wrote:
> From: "carl.yin" <carl.yin@...ctel.com>
>
> 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@...ctel.com>
> ---
> 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.
> 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?
> 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.
> 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
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