meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-arm64-ack-5.15/tc/0006-firmware-arm_ffa-Fix-FFA_MEM_SHARE-and-FFA_MEM_FRAG_.patch

From 47cd54d908380de17d84a852625ef3a1ff92f496 Mon Sep 17 00:00:00 2001
From: Arunachalam Ganapathy <arunachalam.ganapathy@arm.com>
Date: Fri, 14 Jan 2022 12:23:04 +0000
Subject: [PATCH 06/40] firmware: arm_ffa: Fix FFA_MEM_SHARE and
 FFA_MEM_FRAG_TX

FFA memory share on success might return FFA_MEM_FRAG_RX. In that case
set handle from w1/w2 from FFA return value.

FFA_MEM_FRAG_TX call will return FFA_SUCCESS for the last fragment, so
check for this return code.

Signed-off-by: Arunachalam Ganapathy <arunachalam.ganapathy@arm.com>
Change-Id: I7ef44742d53a9e75d8587d1213be98a1352f16d4
Upstream-Status: Pending [Not submitted to upstream yet]
Signed-off-by: Rupinderjit Singh <rupinderjit.singh@arm.com>
---
 drivers/firmware/arm_ffa/driver.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index d3d53fbd3d29..de6641912768 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -317,11 +317,15 @@ static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
 	if (ret.a0 == FFA_ERROR)
 		return ffa_to_linux_errno((int)ret.a2);
 
-	if (ret.a0 != FFA_SUCCESS)
+	if (ret.a0 != FFA_SUCCESS && ret.a0 != FFA_MEM_FRAG_RX)
 		return -EOPNOTSUPP;
 
-	if (handle)
-		*handle = PACK_HANDLE(ret.a2, ret.a3);
+	if (handle) {
+		if (ret.a0 == FFA_MEM_FRAG_RX)
+			*handle = PACK_HANDLE(ret.a1, ret.a2);
+		else
+			*handle = PACK_HANDLE(ret.a2, ret.a3);
+	}
 
 	return frag_len;
 }
@@ -345,7 +349,7 @@ static int ffa_mem_next_frag(u64 handle, u32 frag_len)
 	if (ret.a0 == FFA_ERROR)
 		return ffa_to_linux_errno((int)ret.a2);
 
-	if (ret.a0 != FFA_MEM_FRAG_RX)
+	if (ret.a0 != FFA_SUCCESS && ret.a0 != FFA_MEM_FRAG_RX)
 		return -EOPNOTSUPP;
 
 	return ret.a3;
-- 
2.34.1