esp-scsi: indicate acceptance of MESSAGE IN phase data

When the target has sent its MESSAGE IN phase data to the initiator, it waits
for the initiator to release the ACK signal before disconnecting from the bus.

Send a MSG_ACC command to the ESP so that the initiator releases the ACK signal
to allow the target to disconnect, and also return the ASC back to the
disconnected state.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-ID: <20240829115846.954993-1-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/src/hw/esp-scsi.c b/src/hw/esp-scsi.c
index 8612069f99dee5616753784ab97a00af2332c209..e1bee54541450daafdd3abc08f555be51848cb71 100644 (file)
--- a/src/hw/esp-scsi.c
+++ b/src/hw/esp-scsi.c
@@ -50,6 +50,7 @@
 #define ESP_CMD_RESET    0x02
 #define ESP_CMD_TI       0x10
 #define ESP_CMD_ICCS     0x11
+#define ESP_CMD_MSGACC   0x12
 #define ESP_CMD_SELATN   0x42
 
 #define ESP_STAT_DI      0x01
@@ -159,11 +160,12 @@ esp_scsi_process_op(struct disk_op_s *op)
             continue;
         }
 
-        /* Finally read data from the message in phase.  */
+        /* Finally read data from the message in phase and accept.  */
         if (state == 3 && (stat & ESP_STAT_MSG)) {
             state++;
             status = inb(iobase + ESP_FIFO);
             inb(iobase + ESP_FIFO);
+            outb(ESP_CMD_MSGACC, iobase + ESP_CMD);
             break;
         }
         usleep(5);