Quoting Sibi Sankar (2020-09-16 07:52:52)
> On secure devices which support warm reset, the MBA firmware requires
> access to the modem region to clear them out. Hence provide Q6 access
> to this region before MBA boot. This will be a nop during a modem SSR.
>
Does it need a Fixes: tag? Probably.
> Signed-off-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
> ---
>
Trivia time!
>
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index c401bcc263fa..f989ca81d374 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -931,6 +931,16 @@ static int q6v5_mba_load(struct q6v5 *qproc)
> goto assert_reset;
> }
>
> + /* Some versions of the MBA firmware will upon boot wipe the MPSS region as well, so provide
Should have /* on a line by itself.
> + * the Q6 access to this region.
> + */
> + ret = q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm, false, true,
> + qproc->mpss_phys, qproc->mpss_size);
> + if (ret) {
> + dev_err(qproc->dev, "assigning Q6 access to mpss memory failed: %d\n", ret);
> + goto disable_active_clks;
> + }
> +
> /* Assign MBA image access in DDR to q6 */
> ret = q6v5_xfer_mem_ownership(qproc, &qproc->mba_perm, false, true,
> qproc->mba_phys, qproc->mba_size);
> @@ -1137,8 +1147,7 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
>
> /**
Should be /* instead of /**, the latter is for kernel-doc which this is
not.
> * In case of a modem subsystem restart on secure devices, the modem
> - * memory can be reclaimed only after MBA is loaded. For modem cold
> - * boot this will be a nop
> + * memory can be reclaimed only after MBA is loaded.
> */
> q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm, true, false,
> qproc->mpss_phys, qproc->mpss_size);
