esp.c: remove MacOS TI workaround that pads FIFO transfers to ESP_FIF…

…O_SZ

This workaround is no longer required with the current code and so can be
removed.

[Note: whilst MacOS itself can boot correctly, removing this hack prevents
a bootable EMILE CDROM from working. This is caused by a separate bug which
will be fixed by a subsequent patch]

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: <20240112125420.514425-17-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

hw/scsi/esp.c

@@ -772,18 +772,6 @@ static void esp_do_dma(ESPState *s)
             s->async_buf += len;
             s->async_len -= len;
             s->ti_size -= len;
-
-            /*
-             * MacOS toolbox uses a TI length of 16 bytes for all commands, so
-             * commands shorter than this must be padded accordingly
-             */
-            if (len < esp_get_tc(s) && esp_get_tc(s) <= ESP_FIFO_SZ) {
-                while (fifo8_num_used(&s->fifo) < ESP_FIFO_SZ) {
-                    esp_fifo_push(&s->fifo, 0);
-                    len++;
-                }
-            }
-
             esp_set_tc(s, esp_get_tc(s) - len);
             esp_set_pdma_cb(s, DO_DMA_PDMA_CB);
             esp_raise_drq(s);