This is a note to let you know that I've just added the patch titled
staging: comedi: 8255_pci: fix for newer PCI-DIO48H
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-comedi-8255_pci-fix-for-newer-pci-dio48h.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0283f7a100882684ad32b768f9f1ad81658a0b92 Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@xxxxxxxxx>
Date: Fri, 13 Dec 2013 12:00:30 +0000
Subject: staging: comedi: 8255_pci: fix for newer PCI-DIO48H
From: Ian Abbott <abbotti@xxxxxxxxx>
commit 0283f7a100882684ad32b768f9f1ad81658a0b92 upstream.
At some point, Measurement Computing / ComputerBoards redesigned the
PCI-DIO48H to use a PLX PCI interface chip instead of an AMCC chip.
This meant they had to put their hardware registers in the PCI BAR 2
region instead of PCI BAR 1. Unfortunately, they kept the same PCI
device ID for the new design. This means the driver recognizes the
newer cards, but doesn't work (and is likely to screw up the local
configuration registers of the PLX chip) because it's using the wrong
region.
Since the PCI subvendor and subdevice IDs were both zero on the old
design, but are the same as the vendor and device on the new design, we
can tell the old design and new design apart easily enough. Split the
existing entry for the PCI-DIO48H in `pci_8255_boards[]` into two new
entries, referenced by different entries in the PCI device ID table
`pci_8255_pci_table[]`. Use the same board name for both entries.
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
Acked-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/cb_pcidio.c | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)
--- a/drivers/staging/comedi/drivers/cb_pcidio.c
+++ b/drivers/staging/comedi/drivers/cb_pcidio.c
@@ -56,10 +56,6 @@ struct pcidio_board {
const char *name; /* name of the board */
int dev_id;
int n_8255; /* number of 8255 chips on board */
-
- /* indices of base address regions */
- int pcicontroler_badrindex;
- int dioregs_badrindex;
};
static const struct pcidio_board pcidio_boards[] = {
@@ -67,22 +63,16 @@ static const struct pcidio_board pcidio_
.name = "pci-dio24",
.dev_id = 0x0028,
.n_8255 = 1,
- .pcicontroler_badrindex = 1,
- .dioregs_badrindex = 2,
},
{
.name = "pci-dio24h",
.dev_id = 0x0014,
.n_8255 = 1,
- .pcicontroler_badrindex = 1,
- .dioregs_badrindex = 2,
},
{
.name = "pci-dio48h",
.dev_id = 0x000b,
.n_8255 = 2,
- .pcicontroler_badrindex = 0,
- .dioregs_badrindex = 1,
},
};
@@ -239,10 +229,15 @@ found:
if (comedi_pci_enable(pcidev, thisboard->name))
return -EIO;
- devpriv->dio_reg_base
- =
+ /*
+ * Use PCI BAR 2 region if non-zero length, else use PCI BAR 1 region.
+ * PCI BAR 1 is only used for older PCI-DIO48H boards. At some point
+ * the PCI-DIO48H was redesigned to use the same PCI interface chip
+ * (and same PCI BAR region) as the other boards.
+ */
+ devpriv->dio_reg_base =
pci_resource_start(devpriv->pci_dev,
- pcidio_boards[index].dioregs_badrindex);
+ (pci_resource_len(pcidev, 2) ? 2 : 1));
/*
* Allocate the subdevice structures. alloc_subdevice() is a
Patches currently in stable-queue which might be from abbotti@xxxxxxxxx are
queue-3.4/staging-comedi-8255_pci-fix-for-newer-pci-dio48h.patch
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