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-rw-r--r--drivers/ata/libata-core.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 8a79b97..02425e4 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2759,7 +2759,11 @@ static int ata_dev_set_mode(struct ata_device *dev)
/* Old CFA may refuse this command, which is just fine */
if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
err_mask &= ~AC_ERR_DEV;
-
+ /* Some very old devices and some bad newer ones fail any kind of
+ SET_XFERMODE request but support PIO0-2 timings and no IORDY */
+ if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
+ dev->pio_mode <= XFER_PIO_2)
+ err_mask &= ~AC_ERR_DEV;
if (err_mask) {
ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
"(err_mask=0x%x)\n", err_mask);