From: Conke Hu Date: Sat, 27 Jan 2007 12:46:40 +0000 (+0100) Subject: atiixp.c: add cable detection support for ATI IDE X-Git-Tag: firefly_0821_release~31388^2~5 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e5c073ff24604d4dbb2fbcedb17da6df768468d3;p=firefly-linux-kernel-4.4.55.git atiixp.c: add cable detection support for ATI IDE IDE HDD does not work if it uses a 40-pin PATA cable on ATI chipset. This patch fixes the bug. Signed-off-by: Conke Hu Cc: Alan Cox Cc: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Bartlomiej Zolnierkiewicz --- diff --git a/drivers/ide/pci/atiixp.c b/drivers/ide/pci/atiixp.c index 5b7e000ac2f5..7e1d07031d32 100644 --- a/drivers/ide/pci/atiixp.c +++ b/drivers/ide/pci/atiixp.c @@ -291,8 +291,12 @@ fast_ata_pio: static void __devinit init_hwif_atiixp(ide_hwif_t *hwif) { + u8 udma_mode = 0; + u8 ch = hwif->channel; + struct pci_dev *pdev = hwif->pci_dev; + if (!hwif->irq) - hwif->irq = hwif->channel ? 15 : 14; + hwif->irq = ch ? 15 : 14; hwif->autodma = 0; hwif->tuneproc = &atiixp_tuneproc; @@ -308,8 +312,12 @@ static void __devinit init_hwif_atiixp(ide_hwif_t *hwif) hwif->mwdma_mask = 0x06; hwif->swdma_mask = 0x04; - /* FIXME: proper cable detection needed */ - hwif->udma_four = 1; + pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ch, &udma_mode); + if ((udma_mode & 0x07) >= 0x04 || (udma_mode & 0x70) >= 0x40) + hwif->udma_four = 1; + else + hwif->udma_four = 0; + hwif->ide_dma_host_on = &atiixp_ide_dma_host_on; hwif->ide_dma_host_off = &atiixp_ide_dma_host_off; hwif->ide_dma_check = &atiixp_dma_check;