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[PULL 08/18] hw/sd: ssi-sd: Fix STOP_TRANSMISSION (CMD12) response

From: Philippe Mathieu-Daudé
Subject: [PULL 08/18] hw/sd: ssi-sd: Fix STOP_TRANSMISSION (CMD12) response
Date: Sat, 20 Feb 2021 01:12:59 +0100

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

CMD12's response type is R1b, which is basically a R1 plus optional
addition of the busy signal token that can be any number of bytes.
A zero value indicates card is busy and a non-zero value indicates
the card is ready for the next command.

Current implementation sends the busy signal token without sending
the R1 first. This does not break the U-Boot/Linux mmc_spi driver,
but it does not make the VxWorks driver happy.

Move the testing logic of s->stopping in the SSI_SD_RESPONSE state
a bit later, after the first byte of the card reponse is sent out,
to conform with the spec. After the busy signal token is sent, the
state should be transferred to SSI_SD_CMD.

Fixes: 775616c3ae8c ("Partial SD card SPI mode support")
Signed-off-by: Bin Meng <bin.meng@windriver.com>
Message-Id: <20210128063035.15674-9-bmeng.cn@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
 hw/sd/ssi-sd.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c
index 84c873b3fd4..907d681d19e 100644
--- a/hw/sd/ssi-sd.c
+++ b/hw/sd/ssi-sd.c
@@ -243,14 +243,15 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev, 
uint32_t val)
         s->mode = SSI_SD_RESPONSE;
         return SSI_DUMMY;
     case SSI_SD_RESPONSE:
-        if (s->stopping) {
-            s->stopping = 0;
-            return SSI_DUMMY;
-        }
         if (s->response_pos < s->arglen) {
             DPRINTF("Response 0x%02x\n", s->response[s->response_pos]);
             return s->response[s->response_pos++];
+        if (s->stopping) {
+            s->stopping = 0;
+            s->mode = SSI_SD_CMD;
+            return SSI_DUMMY;
+        }
         if (sdbus_data_ready(&s->sdbus)) {
             DPRINTF("Data read\n");
             s->mode = SSI_SD_DATA_START;

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