commit 49521f97ccd3c2bf6e71a91cea8fe65d170fa4fb
author Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Mon Jul 09 23:17:58 2007 +0200
committer Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Mon Jul 09 23:17:58 2007 +0200
tree f61c34da6092f2f1a97a78da567afc59ad40850b
parent 75b1d97535327d0428c6bffd9d5407e65546fd5d

ide: add short cables support

This patch allows users to override both host and device side cable detection
with "ideX=ata66" kernel parameter.  Thanks to this it should be now possible
to use UDMA > 2 modes on systems (laptops mainly) which use short 40-pin cable
instead of 80-pin one.

Next patches add automatic detection of some systems using short cables.

Changes:

* Rename hwif->udma_four to hwif->cbl and make it u8.

* Convert all existing users accordingly (use ATA_CBL_* defines while at it).  

* Add ATA_CBL_PATA40_SHORT support to ide-iops.c:eighty_ninty_three().

* Use ATA_CBL_PATA40_SHORT for "ideX=ata66" kernel parameter.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Reviewed-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>

drivers/ide/pci/it8213.c

diff --git a/drivers/ide/pci/it8213.c b/drivers/ide/pci/it8213.c
index c04a026..ff48c23 100644
--- a/drivers/ide/pci/it8213.c
+++ b/drivers/ide/pci/it8213.c
@@ -231,7 +231,7 @@
 
 static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
 {
-	u8 reg42h = 0, ata66 = 0;
+	u8 reg42h = 0;
 
 	hwif->speedproc = &it8213_tune_chipset;
 	hwif->tuneproc	= &it8213_tuneproc;
@@ -250,11 +250,11 @@
 	hwif->swdma_mask = 0x04;
 
 	pci_read_config_byte(hwif->pci_dev, 0x42, &reg42h);
-	ata66 = (reg42h & 0x02) ? 0 : 1;
 
 	hwif->ide_dma_check = &it8213_config_drive_for_dma;
-	if (!(hwif->udma_four))
-		hwif->udma_four = ata66;
+
+	if (hwif->cbl != ATA_CBL_PATA40_SHORT)
+		hwif->cbl = (reg42h & 0x02) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 
 	/*
 	 *	The BIOS often doesn't set up DMA on this controller