lkml.org 
[lkml]   [2010]   [Nov]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] tpm: Autodetect itpm devices

[ added James Morris and Rafael to CC ]

On Thu, 21 Oct 2010, Matthew Garrett wrote:

> Some Lenovos have TPMs that require a quirk to function correctly. This can
> be autodetected by checking whether the device has a _HID of INTC0102. This
> is an invalid PNPid, and as such is discarded by the pnp layer - however
> it's still present in the ACPI code, so we can pull it out that way. This
> means that the quirk won't be automatically applied on non-ACPI systems,
> but without ACPI we don't have any way to identify the chip anyway so I
> don't think that's a great concern.
>
> Signed-off-by: Matthew Garrett <mjg@redhat.com>

Tested-by: Jiri Kosina <jkosina@suse.cz>

This definitely is .37 material still, as it fixes suspend regression on
various machines, as reported here:

http://lkml.org/lkml/2010/11/1/493
http://lkml.org/lkml/2010/11/29/219

James, any word on this? It doesn't seem to be present either in Linus'
tree, nor in linux-next.

Thanks.

> ---
> drivers/char/tpm/tpm_tis.c | 24 ++++++++++++++++++++++++
> 1 files changed, 24 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index 1030f84..c17a305 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -25,6 +25,7 @@
> #include <linux/slab.h>
> #include <linux/interrupt.h>
> #include <linux/wait.h>
> +#include <linux/acpi.h>
> #include "tpm.h"
>
> #define TPM_HEADER_SIZE 10
> @@ -78,6 +79,26 @@ enum tis_defaults {
> static LIST_HEAD(tis_chips);
> static DEFINE_SPINLOCK(tis_lock);
>
> +#ifdef CONFIG_ACPI
> +static int is_itpm(struct pnp_dev *dev)
> +{
> + struct acpi_device *acpi = pnp_acpi_device(dev);
> + struct acpi_hardware_id *id;
> +
> + list_for_each_entry(id, &acpi->pnp.ids, list) {
> + if (!strcmp("INTC0102", id->id))
> + return 1;
> + }
> +
> + return 0;
> +}
> +#else
> +static int is_itpm(struct pnp_dev *dev)
> +{
> + return 0;
> +}
> +#endif
> +
> static int check_locality(struct tpm_chip *chip, int l)
> {
> if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
> @@ -472,6 +493,9 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
> "1.2 TPM (device-id 0x%X, rev-id %d)\n",
> vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
>
> + if (is_itpm(to_pnp_dev(dev)))
> + itpm = 1;
> +
> if (itpm)
> dev_info(dev, "Intel iTPM workaround enabled\n");
>
>

--
Jiri Kosina
SUSE Labs, Novell Inc.



\
 
 \ /
  Last update: 2010-11-29 16:57    [W:0.069 / U:2.360 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site