diff mbox series

[v2,2/3] bus: mhi: core: Download AMSS image from appropriate function

Message ID 1610651795-31287-3-git-send-email-bbhatt@codeaurora.org
State Superseded
Headers show
Series Serialize execution environment changes for MHI | expand

Commit Message

Bhaumik Bhatt Jan. 14, 2021, 7:16 p.m. UTC 
During full boot chain firmware download, the PM state worker
downloads the AMSS image after waiting for the SBL execution
environment change in PBL mode itself. Since getting rid of the
firmware load worker thread, this design needs to change and MHI
host must download the AMSS image from the SBL mode of PM state
worker thread instead. Since the full boot chain firmware
download is associated with a synchronous power up and has MHI
host waiting for a transition to mission mode with a timeout, we
can skip creating any devices (or probing any client drivers) in
SBL mode transition and proceed directly with the AMSS image
download.

This means that if MHI host driver is not responsible for the
AMSS image download or the controller plans to have client
drivers opening any SBL channels, for example, to download images
or monitor debug logs for memory allocations or power management,
the device can be powered up asynchronously.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
---
 drivers/bus/mhi/core/boot.c     | 44 ++++++++++++++++++++---------------------
 drivers/bus/mhi/core/internal.h |  1 +
 drivers/bus/mhi/core/pm.c       |  2 ++
 3 files changed, 24 insertions(+), 23 deletions(-)

Comments

Hemant Kumar Jan. 15, 2021, 6:58 p.m. UTC | #1 
Hi Bhaumik,

On 1/14/21 11:16 AM, Bhaumik Bhatt wrote:
> During full boot chain firmware download, the PM state worker
> downloads the AMSS image after waiting for the SBL execution
> environment change in PBL mode itself. Since getting rid of the
> firmware load worker thread, this design needs to change and MHI
Can we reword this as current driver does not have firmware load worker 
thread. Basically change is to avoid blocking st worker thread with a 
timeout to get SBL EE before starting AMSS image download. Instead 
trigger AMSS image download directly from the st worker thread when
DEV_ST_TRANSITION_SBL is queued.

> host must download the AMSS image from the SBL mode of PM state
> worker thread instead. Since the full boot chain firmware
> download is associated with a synchronous power up and has MHI
> host waiting for a transition to mission mode with a timeout, we
> can skip creating any devices (or probing any client drivers) in
> SBL mode transition and proceed directly with the AMSS image
> download.
> 
> This means that if MHI host driver is not responsible for the
> AMSS image download or the controller plans to have client
> drivers opening any SBL channels, for example, to download images
> or monitor debug logs for memory allocations or power management,
> the device can be powered up asynchronously.
> 
[..]

Thanks,
Hemant
diff mbox series

Patch

diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
index c2546bf..b91c7b3 100644
--- a/drivers/bus/mhi/core/boot.c
+++ b/drivers/bus/mhi/core/boot.c
@@ -389,7 +389,6 @@  static void mhi_firmware_copy(struct mhi_controller *mhi_cntrl,
 void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 {
 	const struct firmware *firmware = NULL;
-	struct image_info *image_info;
 	struct device *dev = &mhi_cntrl->mhi_dev->dev;
 	const char *fw_name;
 	void *buf;
@@ -500,28 +499,6 @@  void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 		goto error_ready_state;
 	}
 
-	/* Wait for the SBL event */
-	ret = wait_event_timeout(mhi_cntrl->state_event,
-				 mhi_cntrl->ee == MHI_EE_SBL ||
-				 MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state),
-				 msecs_to_jiffies(mhi_cntrl->timeout_ms));
-
-	if (!ret || MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
-		dev_err(dev, "MHI did not enter SBL\n");
-		goto error_ready_state;
-	}
-
-	/* Start full firmware image download */
-	image_info = mhi_cntrl->fbc_image;
-	ret = mhi_fw_load_bhie(mhi_cntrl,
-			       /* Vector table is the last entry */
-			       &image_info->mhi_buf[image_info->entries - 1]);
-	if (ret) {
-		dev_err(dev, "MHI did not load image over BHIe, ret: %d\n",
-			ret);
-		goto error_fw_load;
-	}
-
 	return;
 
 error_ready_state:
@@ -532,3 +509,24 @@  void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 	mhi_cntrl->pm_state = MHI_PM_FW_DL_ERR;
 	wake_up_all(&mhi_cntrl->state_event);
 }
+
+int mhi_download_amss_image(struct mhi_controller *mhi_cntrl)
+{
+	struct image_info *image_info = mhi_cntrl->fbc_image;
+	struct device *dev = &mhi_cntrl->mhi_dev->dev;
+	int ret;
+
+	if (!image_info)
+		return -EIO;
+
+	ret = mhi_fw_load_bhie(mhi_cntrl,
+			       /* Vector table is the last entry */
+			       &image_info->mhi_buf[image_info->entries - 1]);
+	if (ret) {
+		dev_err(dev, "MHI did not load AMSS, ret:%d\n", ret);
+		mhi_cntrl->pm_state = MHI_PM_FW_DL_ERR;
+		wake_up_all(&mhi_cntrl->state_event);
+	}
+
+	return ret;
+}
diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index 6f80ec3..6f37439 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -619,6 +619,7 @@  int mhi_pm_m3_transition(struct mhi_controller *mhi_cntrl);
 int __mhi_device_get_sync(struct mhi_controller *mhi_cntrl);
 int mhi_send_cmd(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan,
 		 enum mhi_cmd_type cmd);
+int mhi_download_amss_image(struct mhi_controller *mhi_cntrl);
 static inline bool mhi_is_active(struct mhi_controller *mhi_cntrl)
 {
 	return (mhi_cntrl->dev_state >= MHI_STATE_M0 &&
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 8da8806..44aa7eb 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -758,6 +758,8 @@  void mhi_pm_st_worker(struct work_struct *work)
 			 * either SBL or AMSS states
 			 */
 			mhi_create_devices(mhi_cntrl);
+			if (mhi_cntrl->fbc_download)
+				mhi_download_amss_image(mhi_cntrl);
 			break;
 		case DEV_ST_TRANSITION_MISSION_MODE:
 			mhi_pm_mission_mode_transition(mhi_cntrl);