getting back udma3 on BX chipset for 2.4.27
PATCH 1/1 getting back udma3 on BX chipset for 2.4.27
Hi,
some time between 2.4.18 and 2.4.22 the support of udma3 (aka UDMA-44) was lost. Here is a trivial patch to get it back (if someone is interested I can make it cleaner). Having IBM-DTLA-307030 and SAMSUNG SV1604N drives I got significant advantage of using udma3 (23M/s vs 30M/s).
Regards,
Artyom Tarasenko.
ide/ide-lib.c Wed Aug 25 14:59:29 2004 renamed from ide/ide-lib.orig.c Wed Aug 25 14:47:42 2004 +4 -0
@@ -107,6 +107,10 @@ if ((id->dma_ultra & 0x0008) && (id->dma_ultra & hwif->ultra_mask)) { speed = XFER_UDMA_3; break; } + case 0x05: + if ((id->dma_ultra & 0x0008) && + (id->dma_ultra & hwif->ultra_mask)) + { speed = XFER_UDMA_3; break; } case 0x01: if ((id->dma_ultra & 0x0004) && (id->dma_ultra & hwif->ultra_mask))
@@ -161,13 +165,13 @@
#ifdef CONFIG_BLK_DEV_IDEDMA
static u8 speed_max[] = {
XFER_MW_DMA_2, XFER_UDMA_2, XFER_UDMA_4,
- XFER_UDMA_5, XFER_UDMA_6
+ XFER_UDMA_5, XFER_UDMA_6,XFER_UDMA_3
};// printk("%s: mode 0x%02x, speed 0x%02x\n", __FUNCTION__, mode, speed);
/* So that we remember to update this if new modes appear */
- if (mode > 4)
+ if (mode > 5)
BUG();
return min(speed, speed_max[mode]);#else /* !CONFIG_BLK_DEV_IDEDMA */
ide/pci/piix.c Wed Aug 25 16:15:49 2004 renamed from ide/pci/piix.orig.c Sun Aug 8 01:26:04 2004 +4 -1
@@ -301,8 +301,11 @@ case PCI_DEVICE_ID_INTEL_82372FB_1: mode = 2; break; - /* UDMA 33 capable */ + /* UDMA 44 capable */ case PCI_DEVICE_ID_INTEL_82371AB: + mode = 5; + break; + /* UDMA 33 capable */ case PCI_DEVICE_ID_INTEL_82443MX_1: case PCI_DEVICE_ID_INTEL_82451NX: case PCI_DEVICE_ID_INTEL_82801AB_1: