[libata promise] fixes suggested by Promise

* flush host FIFO after sending data to DIMM window
* don't set SCR addresses, as the hardware doesn't have SCRs
  (cosmetic)

drivers/scsi/sata_promise.c

@@ -54,6 +54,7 @@ enum {
 	PDC_HDMA_CTLSTAT	= 0x12C, /* Host DMA control / status */
 	PDC_20621_SEQCTL	= 0x400,
 	PDC_20621_SEQMASK	= 0x480,
+	PDC_20621_GENERAL_CTL	= 0x484,
 	PDC_20621_PAGE_SIZE	= (32 * 1024),
 
 	/* chosen, not constant, values; we design our own DIMM mem map */
@@ -585,12 +586,17 @@ static void pdc20621_fill_sg(struct ata_queued_cmd *qc)
 	struct scatterlist *sg = qc->sg;
 	struct ata_port *ap = qc->ap;
 	struct pdc_port_priv *pp = ap->private_data;
+	void *mmio = ap->host_set->mmio_base;
 	void *dimm_mmio = ap->host_set->private_data;
 	unsigned int portno = ap->port_no;
 	unsigned int i, last, idx, total_len = 0, sgt_len;
 	u32 *buf = (u32 *) &pp->dimm_buf[PDC_DIMM_HEADER_SZ];
 
 	VPRINTK("ata%u: ENTER\n", ap->id);
+
+	/* hard-code chip #0 */
+	mmio += PDC_CHIP0_OFS;
+
 	/*
 	 * Build S/G table
 	 */
@@ -626,7 +632,12 @@ static void pdc20621_fill_sg(struct ata_queued_cmd *qc)
 	memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP) +
 		    PDC_DIMM_HOST_PRD,
 		    &pp->dimm_buf[PDC_DIMM_HEADER_SZ], sgt_len);
-	readl(dimm_mmio);	/* flush */
+
+	/* force host FIFO dump */
+	writel(0x00000001, mmio + PDC_20621_GENERAL_CTL);
+
+	readl(dimm_mmio);	/* MMIO PCI posting flush */
+
 	VPRINTK("ata pkt buf ofs %u, prd size %u, mmio copied\n", i, sgt_len);
 }
 
@@ -1223,10 +1234,12 @@ static int pdc_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *
 	}
 
 	pdc_sata_setup_port(&probe_ent->port[0], base + 0x200);
-	probe_ent->port[0].scr_addr = base + 0x400;
-
 	pdc_sata_setup_port(&probe_ent->port[1], base + 0x280);
+
+	if (!have_20621) {
+		probe_ent->port[0].scr_addr = base + 0x400;
 		probe_ent->port[1].scr_addr = base + 0x500;
+	}
 
 	/* notice 4-port boards */
 	switch (board_idx) {
@@ -1235,10 +1248,12 @@ static int pdc_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *
        		probe_ent->n_ports = 4;
 
 		pdc_sata_setup_port(&probe_ent->port[2], base + 0x300);
-		probe_ent->port[2].scr_addr = base + 0x600;
-
 		pdc_sata_setup_port(&probe_ent->port[3], base + 0x380);
+
+		if (!have_20621) {
+			probe_ent->port[2].scr_addr = base + 0x600;
 			probe_ent->port[3].scr_addr = base + 0x700;
+		}
 		break;
 	case board_2037x:
        		probe_ent->n_ports = 2;