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[PATCH] libata: add 40pin "short" cable support, honour drive side speed detection

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[deweerdt@free.fr: build fix]
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Frederik Deweerdt <deweerdt@free.fr>
Cc: Tejun Heo <htejun@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox 2006-10-10 14:28:11 -07:00 committed by Jeff Garzik
parent 2f27ce0362
commit fc085150b4
4 changed files with 50 additions and 4 deletions
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31
drivers/ata/ata_piix.c
View File

@ -93,7 +93,7 @@
#include <linux/libata.h>
#define DRV_NAME "ata_piix"
#define DRV_VERSION "2.00ac6"
#define DRV_VERSION "2.00ac7"
enum {
PIIX_IOCFG = 0x54, /* IDE I/O configuration register */
@ -571,6 +571,23 @@ module_param(force_pcs, int, 0444);
MODULE_PARM_DESC(force_pcs, "force honoring or ignoring PCS to work around "
"device mis-detection (0=default, 1=ignore PCS, 2=honor PCS)");
struct ich_laptop {
u16 device;
u16 subvendor;
u16 subdevice;
};
/*
* List of laptops that use short cables rather than 80 wire
*/
static const struct ich_laptop ich_laptop[] = {
/* devid, subvendor, subdev */
{ 0x27DF, 0x0005, 0x0280 }, /* ICH7 on Acer 5602WLMi */
/* end marker */
{ 0, }
};
/**
* piix_pata_cbl_detect - Probe host controller cable detect info
* @ap: Port for which cable detect info is desired
@ -585,12 +602,24 @@ MODULE_PARM_DESC(force_pcs, "force honoring or ignoring PCS to work around "
static void ich_pata_cbl_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
const struct ich_laptop *lap = &ich_laptop[0];
u8 tmp, mask;
/* no 80c support in host controller? */
if ((ap->udma_mask & ~ATA_UDMA_MASK_40C) == 0)
goto cbl40;
/* Check for specials - Acer Aspire 5602WLMi */
while (lap->device) {
if (lap->device == pdev->device &&
lap->subvendor == pdev->subsystem_vendor &&
lap->subdevice == pdev->subsystem_device) {
ap->cbl = ATA_CBL_PATA40_SHORT;
return;
}
lap++;
}
/* check BIOS cable detect results */
mask = ap->port_no == 0 ? PIIX_80C_PRI : PIIX_80C_SEC;
pci_read_config_byte(pdev, PIIX_IOCFG, &tmp);

7
drivers/ata/libata-core.c
View File

@ -3119,6 +3119,13 @@ static void ata_dev_xfermask(struct ata_device *dev)
*/
if (ap->cbl == ATA_CBL_PATA40)
xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
/* Apply drive side cable rule. Unknown or 80 pin cables reported
* host side are checked drive side as well. Cases where we know a
* 40wire cable is used safely for 80 are not checked here.
*/
if (ata_drive_40wire(dev->id) && (ap->cbl == ATA_CBL_PATA_UNK || ap->cbl == ATA_CBL_PATA80))
xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
xfer_mask &= ata_pack_xfermask(dev->pio_mask,
dev->mwdma_mask, dev->udma_mask);

2
drivers/ata/pata_ali.c
View File

@ -78,7 +78,7 @@ static int ali_c2_cable_detect(struct ata_port *ap)
implement the detect logic */
if (ali_cable_override(pdev))
return ATA_CBL_PATA80;
return ATA_CBL_PATA40_SHORT;
/* Host view cable detect 0x4A bit 0 primary bit 1 secondary
Bit set for 40 pin */

14
include/linux/ata.h
View File

@ -200,8 +200,9 @@ enum {
ATA_CBL_NONE = 0,
ATA_CBL_PATA40 = 1,
ATA_CBL_PATA80 = 2,
ATA_CBL_PATA_UNK = 3,
ATA_CBL_SATA = 4,
ATA_CBL_PATA40_SHORT = 3, /* 40 wire cable to high UDMA spec */
ATA_CBL_PATA_UNK = 4,
ATA_CBL_SATA = 5,
/* SATA Status and Control Registers */
SCR_STATUS = 0,
@ -342,6 +343,15 @@ static inline int ata_id_is_cfa(const u16 *id)
return 0;
}
static inline int ata_drive_40wire(const u16 *dev_id)
{
if (ata_id_major_version(dev_id) >= 5 && ata_id_is_sata(dev_id))
return 0; /* SATA */
if (dev_id[93] & 0x4000)
return 0; /* 80 wire */
return 1;
}
static inline int atapi_cdb_len(const u16 *dev_id)
{
u16 tmp = dev_id[0] & 0x3;