diff -up ./drivers/ata/pata_ali.c.dist ./drivers/ata/pata_ali.c
--- ./drivers/ata/pata_ali.c.dist	2017-02-20 16:04:43.000000000 +0900
+++ ./drivers/ata/pata_ali.c	2017-03-12 18:53:56.000000000 +0900
@@ -512,6 +512,15 @@ static int ali_init_one(struct pci_dev *
 		.udma_mask = ATA_UDMA2,
 		.port_ops = &ali_20_port_ops
 	};
+	/* Revision 0xC1 adds UDMA33 */
+	static const struct ata_port_info info_c1 = {
+		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
+							ATA_FLAG_IGN_SIMPLEX,
+		.pio_mask = ATA_PIO4,
+		.mwdma_mask = ATA_MWDMA2,
+		.udma_mask = ATA_UDMA2,
+		.port_ops = &ali_c2_port_ops
+	};
 	/* Revision 0xC2 adds UDMA66 */
 	static const struct ata_port_info info_c2 = {
 		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
@@ -563,8 +572,10 @@ static int ali_init_one(struct pci_dev *
 
 	if (pdev->revision < 0x20) {
 		ppi[0] = &info_early;
-	} else if (pdev->revision < 0xC2) {
+	} else if (pdev->revision < 0xC1) {
         	ppi[0] = &info_20;
+	} else if (pdev->revision == 0xC1) {
+        	ppi[0] = &info_c1;
 	} else if (pdev->revision == 0xC2) {
         	ppi[0] = &info_c2;
 	} else if (pdev->revision == 0xC3) {