From: Bin Meng <bin.meng@windriver.com>
Date: Sat, 6 Mar 2021 06:01:52 +0000 (+0800)
Subject: hw/block: m25p80: Support fast read for SST flashes
X-Git-Tag: v6.0.0-rc0~7^2~3
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=aac8e46e9da6e6ad048d858ecb033c953753f31a;p=users%2Fdwmw2%2Fqemu.git

hw/block: m25p80: Support fast read for SST flashes

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>
Message-id: 20210306060152.7250-1-bmeng.cn@gmail.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---

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;