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bus: mhi: core: Skip RDDM download for unknown execution environment

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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@codeaurora.org>
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Bhaumik Bhatt 2020-11-06 09:44:50 -08:00 • committed by Manivannan Sadhasivam
parent 9e1660e5c3
commit da7bdbf67d
No known key found for this signature in database
GPG key ID: 559F11E6FE91CEF5
1 changed files with 7 additions and 2 deletions
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9
drivers/bus/mhi/core/boot.c
View file

@ -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;
}