On Fri, Nov 06, 2020 at 09:44:50AM -0800, Bhaumik Bhatt wrote:
> If MHI is unable to determine the execution environment during
> the panic path, host must skip the RDDM download. This can happen
> if the BHI offset read or the BHI_EXECENV register read fails
> indicating that the underlying transport is unresponsive. Hence,
> there is no need to trigger an RDDM using SYSERR or request an
> SOC reset.
>
> Suggested-by: Hemant Kumar <hemantk@xxxxxxxxxxxxxx>
> Signed-off-by: Bhaumik Bhatt <bbhatt@xxxxxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Thanks,
Mani
> ---
> drivers/bus/mhi/core/boot.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
> index 16244cc..6f0cfb9 100644
> --- a/drivers/bus/mhi/core/boot.c
> +++ b/drivers/bus/mhi/core/boot.c
> @@ -92,6 +92,9 @@ static int __mhi_download_rddm_in_panic(struct mhi_controller *mhi_cntrl)
> * image download completion.
> */
> ee = mhi_get_exec_env(mhi_cntrl);
> + if (ee == MHI_EE_MAX)
> + goto error_exit_rddm;
> +
> if (ee != MHI_EE_RDDM) {
> dev_dbg(dev, "Trigger device into RDDM mode using SYS ERR\n");
> mhi_set_mhi_state(mhi_cntrl, MHI_STATE_SYS_ERR);
> @@ -139,10 +142,12 @@ static int __mhi_download_rddm_in_panic(struct mhi_controller *mhi_cntrl)
> ee = mhi_get_exec_env(mhi_cntrl);
> ret = mhi_read_reg(mhi_cntrl, base, BHIE_RXVECSTATUS_OFFS, &rx_status);
>
> - dev_err(dev, "Did not complete RDDM transfer\n");
> - dev_err(dev, "Current EE: %s\n", TO_MHI_EXEC_STR(ee));
> dev_err(dev, "RXVEC_STATUS: 0x%x\n", rx_status);
>
> +error_exit_rddm:
> + dev_err(dev, "RDDM transfer failed. Current EE: %s\n",
> + TO_MHI_EXEC_STR(ee));
> +
> return -EIO;
> }
>
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
