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libata: handle early device PIO modes correctly

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This commit is contained in:
Alan Cox 2005-10-21 18:46:32 -04:00 • committed by Jeff Garzik
parent 307e4dc28e
commit 11e29e2151
2 changed files with 36 additions and 8 deletions
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31
drivers/scsi/libata-core.c
View file

@ -1082,6 +1082,31 @@ static inline void ata_dump_id(struct ata_device *dev)
dev->id[93]);
}
/*
* Compute the PIO modes available for this device. This is not as
* trivial as it seems if we must consider early devices correctly.
*
* FIXME: pre IDE drive timing (do we care ?).
*/
static unsigned int ata_pio_modes(struct ata_device *adev)
{
u16 modes;
/* Usual case. Word 53 indicates word 88 is valid */
if (adev->id[ATA_ID_FIELD_VALID] & (1 << 2)) {
modes = adev->id[ATA_ID_PIO_MODES] & 0x03;
modes <<= 3;
modes |= 0x7;
return modes;
}
/* If word 88 isn't valid then Word 51 holds the PIO timing number
for the maximum. Turn it into a mask and return it */
modes = (2 << (adev->id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
return modes;
}
/**
* ata_dev_identify - obtain IDENTIFY x DEVICE page
* @ap: port on which device we wish to probe resides
@ -1215,10 +1240,8 @@ retry:
xfer_modes = dev->id[ATA_ID_UDMA_MODES];
if (!xfer_modes)
xfer_modes = (dev->id[ATA_ID_MWDMA_MODES]) << ATA_SHIFT_MWDMA;
if (!xfer_modes) {
xfer_modes = (dev->id[ATA_ID_PIO_MODES]) << (ATA_SHIFT_PIO + 3);
xfer_modes |= (0x7 << ATA_SHIFT_PIO);
}
if (!xfer_modes)
xfer_modes = ata_pio_modes(dev);
ata_dump_id(dev);

13
include/linux/ata.h
View file

@ -42,13 +42,18 @@ enum {
ATA_SECT_SIZE = 512,
ATA_ID_WORDS = 256,
ATA_ID_PROD_OFS = 27,
ATA_ID_FW_REV_OFS = 23,
ATA_ID_SERNO_OFS = 10,
ATA_ID_MAJOR_VER = 80,
ATA_ID_PIO_MODES = 64,
ATA_ID_FW_REV_OFS = 23,
ATA_ID_PROD_OFS = 27,
ATA_ID_OLD_PIO_MODES = 51,
ATA_ID_FIELD_VALID = 53,
ATA_ID_MWDMA_MODES = 63,
ATA_ID_PIO_MODES = 64,
ATA_ID_EIDE_DMA_MIN = 65,
ATA_ID_EIDE_PIO = 67,
ATA_ID_EIDE_PIO_IORDY = 68,
ATA_ID_UDMA_MODES = 88,
ATA_ID_MAJOR_VER = 80,
ATA_ID_PIO4 = (1 << 1),
ATA_PCI_CTL_OFS = 2,