firmware: ti_sci: Add comment explaining the is_secure code
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>
diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index b77ac36..ee09218 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -239,6 +239,12 @@
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;