pata_sis: enable MWDMA for UDMA 133 chipset

This ports the timing values over from the old IDE driver into the new
PATA-based one. The comment was lying when it stated the old driver was
not MWDMA capable.

Boot tested on actual hardware using 'libata.force=mwdma2'.

Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 17 insertions, 8 deletions

diff --git a/drivers/ata/pata_sis.c b/drivers/ata/pata_sis.c
index fb4e90f6d749..a42668bd48f8 100644
--- a/drivers/ata/pata_sis.c
+++ b/drivers/ata/pata_sis.c
@@ -485,21 +485,30 @@ static void sis_133_set_dmamode (struct ata_port *ap, struct ata_device *adev)
         int port;
         u32 t1;
 
-        /* bits 4- cycle time 8 - cvs time */
-        static const u32 timing_u100[] = { 0x6B0, 0x470, 0x350, 0x140, 0x120, 0x110, 0x000 };
-        static const u32 timing_u133[] = { 0x9F0, 0x6A0, 0x470, 0x250, 0x230, 0x220, 0x210 };
-
         port = sis_port_base(adev);
         pci_read_config_dword(pdev, port, &t1);
 
         if (adev->dma_mode < XFER_UDMA_0) {
+                /* Recovery << 24 | Act << 16 | Ini << 12, like PIO modes */
+                static const u32 timing_u100[] = { 0x19154000, 0x06072000, 0x04062000 };
+                static const u32 timing_u133[] = { 0x221C6000, 0x0C0A3000, 0x05093000 };
+                int speed = adev->dma_mode - XFER_MW_DMA_0;
+
+                t1 &= 0xC0C00FFF;
+                /* disable UDMA */
                 t1 &= ~0x00000004;
-                /* FIXME: need data sheet to add MWDMA here. Also lacking on
-                   ide/pci driver */
+                if (t1 & 0x08)
+                        t1 |= timing_u133[speed];
+                else
+                        t1 |= timing_u100[speed];
         } else {
+                /* bits 4- cycle time 8 - cvs time */
+                static const u32 timing_u100[] = { 0x6B0, 0x470, 0x350, 0x140, 0x120, 0x110, 0x000 };
+                static const u32 timing_u133[] = { 0x9F0, 0x6A0, 0x470, 0x250, 0x230, 0x220, 0x210 };
                 int speed = adev->dma_mode - XFER_UDMA_0;
-                /* if & 8 no UDMA133 - need info for ... */
+
                 t1 &= ~0x00000FF0;
+                /* enable UDMA */
                 t1 |= 0x00000004;
                 if (t1 & 0x08)
                         t1 |= timing_u133[speed];
@@ -620,7 +629,7 @@ static const struct ata_port_info sis_info100_early = {
 static const struct ata_port_info sis_info133 = {
         .flags          = ATA_FLAG_SLAVE_POSS,
         .pio_mask       = ATA_PIO4,
-        /* No MWDMA */
+        .mwdma_mask     = ATA_MWDMA2,
         .udma_mask      = ATA_UDMA6,
         .port_ops       = &sis_133_ops,
 };