Robert Hancock wrote: > On a Compaq Presario V3000 laptop (NVIDIA MCP51 chipset), pata_amd selects > PIO0 mode for the PATA DVD-RAM drive instead of MWDMA2 which it supports: > > ata4.00: ATAPI: HL-DT-ST DVDRAM GSA-4084N, KQ09, max MWDMA2 > ata4: nv_mode_filter: 0x39f&0x7001->0x1, BIOS=0x0 (0x0) ACPI=0x7001 (60:600:0x11) > ata4.00: configured for PIO0 > > For some reason, the BIOS-set UDMA configuration returns 0 and the ACPI _GTM > reports that UDMA2 and PIO0 are enabled. This causes nv_mode_filter to end up > allowing only PIO0 and UDMA0-2. Since the drive doesn't support UDMA we end up > using PIO0. > > Since the controllers should always support PIO4, MWDMA2 and UDMA2 regardless > of what cable type is used, let's make sure we don't filter out these modes > regardless of what wacky settings the BIOS is using. > > Signed-off-by: Robert Hancock <hancockrwd@xxxxxxxxx> > Cc: stable@xxxxxxxxxx Looks good to me. Acked-by: Tejun Heo <tj@xxxxxxxxxx> Not so sure whether this is -stable material yet tho. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
