[PATCH v2] hw/block: m25p80: Support fast read for SST flashes

[Bin Meng]

From: Bin Meng <bin.meng@windriver.com>

Per SST25VF016B datasheet [1], SST flash requires a dummy byte after
the address bytes. Note only SPI mode is supported by SST flashes.

[1] http://ww1.microchip.com/downloads/en/devicedoc/s71271_04.pdf

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>

---

Changes in v2:
- rebase on qemu/master

 hw/block/m25p80.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
index 5f9471d83c..183d3f44c2 100644
--- a/hw/block/m25p80.c
+++ b/hw/block/m25p80.c
@@ -895,6 +895,9 @@ static void decode_fast_read_cmd(Flash *s)
     s->needed_bytes = get_addr_length(s);
     switch (get_man(s)) {
     /* Dummy cycles - modeled with bytes writes instead of bits */
+    case MAN_SST:
+        s->needed_bytes += 1;
+        break;
     case MAN_WINBOND:
         s->needed_bytes += 8;
         break;
-- 
2.25.1