From: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Some of the other quirks changes seem to have left some users with the simplex
bits mis-set by the time the driver loads. Clear simplex mode before we probe
the controller therefore.
[akpm@xxxxxxxxxxxxxxxxxxxx: fix build after upstream renamed things]
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
Cc: Jeff Garzik <jeff@xxxxxxxxxx>
On Sat, 29 Mar 2008 12:15:40 -0400 Jeff Garzik <jeff@xxxxxxxxxx> wrote:
> This patch triggered an audit which led me to... bug city.
>
> 1) This call occurs before resources are guaranteed to be present, which
> happens when pci[m]_enable_device() is called.
>
> 2) Auditing the other ata_pci_clear_simplex() uses, it seems the others
> are equally broken.
>
> 3) Further, looking at pata_amd, I notice that the resume code twiddles
> bits before the PCI device is even bought into D0 state!
>
> 4) ata_pci_clear_simplex() does its work before resources are mapped,
> and assumes PCI IDE and PCI BAR #4 behavior. This works at present, but
> is less robust than it could be.
>
>
> Anyway, my suggestion would be to add a "post-enable" function pointer
> to ata_pci_init_one() arguments, and call ata_pci_clear_simplex() from
> that hook. That would permit this patch and other
> ata_pci_clear_simplex() callsites to be fixed.
>
> Jeff
>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/ata/pata_atiixp.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff -puN drivers/ata/pata_atiixp.c~pata_atiixp-simplex-clear drivers/ata/pata_atiixp.c
--- a/drivers/ata/pata_atiixp.c~pata_atiixp-simplex-clear
+++ a/drivers/ata/pata_atiixp.c
@@ -22,7 +22,7 @@
#include <linux/libata.h>
#define DRV_NAME "pata_atiixp"
-#define DRV_VERSION "0.4.6"
+#define DRV_VERSION "0.4.7"
enum {
ATIIXP_IDE_PIO_TIMING = 0x40,
@@ -243,6 +243,9 @@ static int atiixp_init_one(struct pci_de
.port_ops = &atiixp_port_ops
};
const struct ata_port_info *ppi[] = { &info, NULL };
+ /* Some of the quirk reconfiguration messes up the simplex flag, so
+ clear it again */
+ ata_pci_bmdma_clear_simplex(dev);
return ata_pci_sff_init_one(dev, ppi, &atiixp_sht, NULL);
}
@@ -279,7 +282,7 @@ static void __exit atiixp_exit(void)
}
MODULE_AUTHOR("Alan Cox");
-MODULE_DESCRIPTION("low-level driver for ATI IXP200/300/400");
+MODULE_DESCRIPTION("low-level driver for ATI IXP series");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, atiixp);
MODULE_VERSION(DRV_VERSION);
_
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