diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 27a1101..8ee6b5b 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -899,14 +899,25 @@
 
 static void sil24_pmp_attach(struct ata_port *ap)
 {
+	u32 *gscr = ap->link.device->gscr;
+
 	sil24_config_pmp(ap, 1);
 	sil24_init_port(ap);
+
+	if (sata_pmp_gscr_vendor(gscr) == 0x11ab &&
+	    sata_pmp_gscr_devid(gscr) == 0x4140) {
+		ata_port_printk(ap, KERN_INFO,
+			"disabling NCQ support due to sil24-mv4140 quirk\n");
+		ap->flags &= ~ATA_FLAG_NCQ;
+	}
 }
 
 static void sil24_pmp_detach(struct ata_port *ap)
 {
 	sil24_init_port(ap);
 	sil24_config_pmp(ap, 0);
+
+	ap->flags |= ATA_FLAG_NCQ;
 }
 
 static int sil24_pmp_hardreset(struct ata_link *link, unsigned int *class,