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mhi: cntrl: qcom: Add support for fatal error processing

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MHI controller needs to handle the fatal error callback issued by the
bus in case reset separation needs to be supported. This state will
occur as a SYS ERROR state with the device being in PBL. Perform a
full power cycle and issue an MHI RESET during power down.

Change-Id: I467943924302ba773c8f6d0c4ad09b51faaeb490
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
This commit is contained in:
Bhaumik Bhatt 2020-05-11 14:04:42 -07:00
commit 5e803bd9f5
2 changed files with 22 additions and 0 deletions
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21
drivers/bus/mhi/controllers/mhi_qcom.c
View file

@ -525,6 +525,22 @@ static int mhi_qcom_power_up(struct mhi_controller *mhi_cntrl)
return ret;
}
static void mhi_qcom_fatal_worker(struct work_struct *work)
{
struct mhi_dev *mhi_dev = container_of(work, struct mhi_dev,
fatal_worker);
struct device *dev = &mhi_dev->pci_dev->dev;
struct mhi_controller *mhi_cntrl = dev_get_drvdata(dev);
int ret;
mhi_power_down(mhi_cntrl, true);
ret = mhi_qcom_power_up(mhi_cntrl);
if (ret)
MHI_ERR("Power up failure after SYS ERROR in PBL, ret:%d\n",
ret);
}
static int mhi_runtime_get(struct mhi_controller *mhi_cntrl, void *priv)
{
struct mhi_dev *mhi_dev = priv;
@ -569,6 +585,10 @@ static void mhi_status_cb(struct mhi_controller *mhi_cntrl,
pm_runtime_put(dev);
mhi_arch_mission_mode_enter(mhi_cntrl);
break;
case MHI_CB_FATAL_ERROR:
MHI_CNTRL_ERR("Perform power cycle due to SYS ERROR in PBL\n");
schedule_work(&mhi_dev->fatal_worker);
break;
default:
MHI_CNTRL_LOG("Unhandled cb:0x%x\n", reason);
}
@ -782,6 +802,7 @@ static struct mhi_controller *mhi_register_controller(struct pci_dev *pci_dev)
goto error_register;
INIT_WORK(&mhi_cntrl->reg_write_work, mhi_reg_write_work);
INIT_WORK(&mhi_dev->fatal_worker, mhi_qcom_fatal_worker);
mhi_cntrl->reg_write_q = kcalloc(REG_WRITE_QUEUE_LEN,
sizeof(*mhi_cntrl->reg_write_q),

1
drivers/bus/mhi/controllers/mhi_qcom.h
View file

@ -63,6 +63,7 @@ struct mhi_dev {
dma_addr_t iova_start;
dma_addr_t iova_stop;
enum mhi_suspend_mode suspend_mode;
struct work_struct fatal_worker;
/* hardware info */
u32 serial_num;