[Qemu-devel] [PATCH v5 22/28] hw/block/pflash_cfi02: Fix reset command not ignored during erase

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

From: Stephen Checkoway <stephen.checkoway@oberlin.edu>

When the flash device is performing a chip erase, all commands are
ignored. When it is performing a sector erase, only the erase suspend
command is valid, which is currently not supported.

In particular, the reset command should not cause the device to reset to
read array mode while programming is on going.

Signed-off-by: Stephen Checkoway <stephen.checkoway@oberlin.edu>
Message-Id: <20190426162624.55977-8-stephen.checkoway@oberlin.edu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 hw/block/pflash_cfi02.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/block/pflash_cfi02.c b/hw/block/pflash_cfi02.c
index 13f76fa71d..39daa95833 100644
--- a/hw/block/pflash_cfi02.c
+++ b/hw/block/pflash_cfi02.c
@@ -311,7 +311,8 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
     trace_pflash_io_write(offset, width, width << 1, value, pfl->wcycle);
     cmd = value;
     if (pfl->cmd != 0xA0) {
-        if (cmd == 0xF0) {
+        /* Reset does nothing during chip erase and sector erase. */
+        if (cmd == 0xF0 && pfl->cmd != 0x10 && pfl->cmd != 0x30) {
             if (pfl->wcycle == WCYCLE_AUTOSELECT_CFI) {
                 /* Return to autoselect mode. */
                 pfl->wcycle = 3;
-- 
2.20.1