[PATCH 3/4] hw/arm/strongarm: Fix dropped upper byte of ssi transfer

[stephensportia@gmail.com]

From: Portia Stephens <portias@oss.tenstorrent.com>

The strongarm model intends to transfer a 16-bit value over SSI. There
is no machine using this model with a peripheral attached so it is
impossible to know what the intended SSI peripheral is.
There is no in-tree peripheral support for 16-bit transfer, update to
use 8-bit transfer.

Signed-off-by: Portia Stephens <portias@oss.tenstorrent.com>
---
 hw/arm/strongarm.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/hw/arm/strongarm.c b/hw/arm/strongarm.c
index e400f0a185..2df895c75b 100644
--- a/hw/arm/strongarm.c
+++ b/hw/arm/strongarm.c
@@ -1512,11 +1512,14 @@ static void strongarm_ssp_write(void *opaque, hwaddr addr,
          * there directly to the slave, no need to buffer it.
          */
         if (s->sscr[0] & SSCR0_SSE) {
-            uint32_t readval;
+            uint32_t readval = 0;
             if (s->sscr[1] & SSCR1_LBM) {
                 readval = value;
             } else {
-                readval = ssi_transfer8(s->bus, value);
+                if (SSCR0_DSS(s->sscr[0]) > 8) {
+                    readval |= ssi_transfer8(s->bus, (value >> 8) & 0xff) << 8;
+                }
+                readval |= ssi_transfer8(s->bus, value & 0xff);
             }
 
             if (s->rx_level < 0x08) {
-- 
2.43.0