[PATCH] firmware: arm_ffa: Allow the FF-A drivers to use 32bit mode of messaging

[Sudeep Holla]

An FF-A ABI could support both the SMC32 and SMC64 conventions.
A callee that runs in the AArch64 execution state and implements such
an ABI must implement both SMC32 and SMC64 conventions of the ABI.

So the FF-A drivers will need the option to choose the mode irrespective
of FF-A version and the partition execution mode flag in the partition
information.

Let us remove the check on the FF-A version for allowing the selection
of 32bit mode of messaging. The driver will continue to set the 32-bit
mode if the partition execution mode flag specified that the partition
supports only 32-bit execution.

Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>
---
 drivers/firmware/arm_ffa/driver.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

Hi Jens,

Based on our discussion in private, I am posting this patch. I am not marking
fixes tag as the driver version is not yet bumped in the mainline. But if you
think it is better to add, I can update when pulling in the change. Let me
know.

Regards,
Sudeep

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 121f4fc903cd..7cd6b1564e80 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -587,17 +587,9 @@ static int ffa_partition_info_get(const char *uuid_str,
 	return 0;
 }
 
-static void _ffa_mode_32bit_set(struct ffa_device *dev)
-{
-	dev->mode_32bit = true;
-}
-
 static void ffa_mode_32bit_set(struct ffa_device *dev)
 {
-	if (drv_info->version > FFA_VERSION_1_0)
-		return;
-
-	_ffa_mode_32bit_set(dev);
+	dev->mode_32bit = true;
 }
 
 static int ffa_sync_send_receive(struct ffa_device *dev,
@@ -706,7 +698,7 @@ static void ffa_setup_partitions(void)
 
 		if (drv_info->version > FFA_VERSION_1_0 &&
 		    !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
-			_ffa_mode_32bit_set(ffa_dev);
+			ffa_mode_32bit_set(ffa_dev);
 	}
 	kfree(pbuf);
 }
-- 
2.42.0