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firmware: ti_sci: Add comment explaining the is_secure code

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Add a comment to explain the code under is_secure condition of
ti_sci_do_xfer. This will help avoid confusion amongst people who may in
future touch upon this code.

Reviewed-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Dhruva Gole <d-gole@ti.com>
This commit is contained in:
Dhruva Gole 2024-01-30 20:30:00 +05:30 committed by Tom Rini
parent 0c4e36d65f
commit c59720c5f4
1 changed files with 6 additions and 0 deletions
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6
drivers/firmware/ti_sci.c
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@ -239,6 +239,12 @@ static int ti_sci_do_xfer(struct ti_sci_info *info,
struct ti_sci_secure_msg_hdr *secure_hdr = (struct ti_sci_secure_msg_hdr *)secure_buf;
int ret;
/*
* The reason why we need the is_secure code is because of boot R5.
* boot R5 starts off in "secure mode" when it hands off from Boot
* ROM over to the Secondary bootloader. The initial set of calls
* we have to make need to be on a secure pipe.
*/
if (info->is_secure) {
/* ToDo: get checksum of the entire message */
secure_hdr->checksum = 0;