From: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

Even though the BLAST command isn't fully implemented in QEMU, the DMA_STAT_BCMBLT
bit should be set after the command has been issued to indicate that the command
has completed.

This fixes an issue with the DC390 DOS driver which issues the BLAST command as
part of its normal error recovery routine at startup, and otherwise sits in a
tight loop waiting for DMA_STAT_BCMBLT to be set before continuing.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Message-ID: <20240112131529.515642-5-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
(cherry picked from commit c2d7de557d19ec76eb83b87b6bf77c8114e2f183)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/hw/scsi/esp-pci.c b/hw/scsi/esp-pci.c
index b1bd43b7db..51f0157934 100644
--- a/hw/scsi/esp-pci.c
+++ b/hw/scsi/esp-pci.c
@@ -124,6 +124,7 @@ static void esp_pci_handle_blast(PCIESPState *pci, uint32_t val)
 {
     trace_esp_pci_dma_blast(val);
     qemu_log_mask(LOG_UNIMP, "am53c974: cmd BLAST not implemented\n");
+    pci->dma_regs[DMA_STAT] |= DMA_STAT_BCMBLT;
 }
 
 static void esp_pci_handle_abort(PCIESPState *pci, uint32_t val)
-- 
2.39.2