From 0bc2a79a2002e3cc1b514c100b6c576983da6a90 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Tue, 31 Jul 2007 14:01:48 +0100 Subject: [PATCH] libata: Correct IORDY handling Debugging a report of a problem with an ancient solid state disk showed up some problems in the IORDY handling 1. We check the wrong bit to see if the device has IORDY 2. Even then some ancient creaking piles of crap don't support SETXFER at all. The cases it fixes are obscure and the risk of side effects is slight but possible. This also moves us slightly closer to supporting original MFM/RLL disks with libata. Signed-off-by: Alan Cox Signed-off-by: Jeff Garzik --- drivers/ata/libata-core.c | 6 +++++- include/linux/ata.h | 2 +- 2 files changed, 6 insertions(+), 2 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); diff --git a/include/linux/ata.h b/include/linux/ata.h index c043c1c..40c7af0 100644 --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -358,7 +358,7 @@ struct ata_taskfile { #define ata_id_removeable(id) ((id)[0] & (1 << 7)) #define ata_id_has_dword_io(id) ((id)[50] & (1 << 0)) #define ata_id_iordy_disable(id) ((id)[49] & (1 << 10)) -#define ata_id_has_iordy(id) ((id)[49] & (1 << 9)) +#define ata_id_has_iordy(id) ((id)[49] & (1 << 11)) #define ata_id_u32(id,n) \ (((u32) (id)[(n) + 1] << 16) | ((u32) (id)[(n)])) #define ata_id_u64(id,n) \ -- 2.7.4