esp.c: consolidate end of command sequence after ICCS command

The end of command sequences for the ICCS command are currently different
between the DMA and non-DMA versions, and also different from the description
in the datasheet.

Update the sequence so that only INTR_FC is asserted in both cases, and keep
all the logic in esp_do_dma() and esp_do_nodma() rather than having some of
it within esp_run_cmd().

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Helge Deller <deller@gmx.de>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20240112125420.514425-70-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

hw/scsi/esp.c

@@ -650,8 +650,7 @@ static void esp_do_dma(ESPState *s)
                 }
 
                 /* Raise end of command interrupt */
-                s->rregs[ESP_RINTR] |= INTR_BS | INTR_FC;
-                s->rregs[ESP_RSEQ] = SEQ_CD;
+                s->rregs[ESP_RINTR] |= INTR_FC;
                 esp_raise_irq(s);
             }
             break;
@@ -825,6 +824,8 @@ static void esp_do_nodma(ESPState *s)
         case CMD_ICCS:
             fifo8_push(&s->fifo, 0);
 
+            /* Raise end of command interrupt */
+            s->rregs[ESP_RINTR] |= INTR_FC;
             esp_raise_irq(s);
             break;
         }
@@ -1056,8 +1057,6 @@ static void esp_run_cmd(ESPState *s)
     case CMD_ICCS:
         trace_esp_mem_writeb_cmd_iccs(cmd);
         write_response(s);
-        s->rregs[ESP_RINTR] |= INTR_FC;
-        esp_set_phase(s, STAT_MI);
         break;
     case CMD_MSGACC:
         trace_esp_mem_writeb_cmd_msgacc(cmd);