@@ -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;
+}
@@ -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 &&
@@ -752,9 +752,13 @@ void mhi_pm_st_worker(struct work_struct *work)
/*
* The MHI devices are only created when the client
* device switches its Execution Environment (EE) to
- * either SBL or AMSS states
+ * either SBL or AMSS states. If FBC download is
+ * expected, we do not create devices in SBL.
*/
- mhi_create_devices(mhi_cntrl);
+ if (mhi_cntrl->fbc_download)
+ mhi_download_amss_image(mhi_cntrl);
+ else
+ mhi_create_devices(mhi_cntrl);
break;
case DEV_ST_TRANSITION_MISSION_MODE:
mhi_pm_mission_mode_transition(mhi_cntrl);
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 | 8 ++++++-- 3 files changed, 28 insertions(+), 25 deletions(-)