HW normally will switch it to stand by mode when receive incorrect
command.
i.e. Macronix MX66L1G45G data sheet section 8 DEVICE OPERATION described
```
2. When an incorrect command is written to this device, it enters
standby mode and stays in standby mode until the next CS# falling edge.
In standby mode, This device's SO pin should be High-Z.
```
Add STATE_STANDBY CMDState and let the device ignore all input and keep
SO as HIZ (output 1)
Signed-off-by: Dan Zhang <dz4l...@gmail.com>
---
A usage of this new state can be aborting in HPM checking
or unknown command code received.
hw/block/m25p80.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
index b6bd430a99..9f89773b11 100644
--- a/hw/block/m25p80.c
+++ b/hw/block/m25p80.c
@@ -423,6 +423,7 @@ typedef enum {
STATE_COLLECTING_DATA,
STATE_COLLECTING_VAR_LEN_DATA,
STATE_READING_DATA,
+ STATE_STANDBY,
} CMDState;
typedef enum {
@@ -1472,6 +1473,9 @@ static uint32_t m25p80_transfer8(SSIPeripheral *ss,
uint32_t tx)
s->cur_addr, (uint8_t)tx);
switch (s->state) {
+ case STATE_STANDBY:
+ r = 0xFFFFFFFF; /* StandBy state SO shall be HiZ */
+ break;
case STATE_PAGE_PROGRAM:
trace_m25p80_page_program(s, s->cur_addr, (uint8_t)tx);
--
2.34.3
