From 3507d612366a4e81226295f646410130a1f62a5c Mon Sep 17 00:00:00 2001 From: Rajiv Andrade Date: Thu, 10 Sep 2009 17:09:35 -0300 Subject: tpm_tis: TPM_STS_DATA_EXPECT workaround Some newer Lenovo models are shipped with a TPM that doesn't seem to set the TPM_STS_DATA_EXPECT status bit when sending it a burst of data, so the code understands it as a failure and doesn't proceed sending the chip the intended data. In this patch we bypass this bit check in case the itpm module parameter was set. This patch is based on Andy Isaacson's one: http://marc.info/?l=linux-kernel&m=124650185023495&w=2 It was heavily discussed how should we deal with identifying the chip in kernel space, but the required patch to do so was NACK'd: http://marc.info/?l=linux-kernel&m=124650186423711&w=2 This way we let the user choose using this workaround or not based on his observations on this code behavior when trying to use the TPM. Fixed a checkpatch issue present on the previous patch, thanks to Daniel Walker. Signed-off-by: Rajiv Andrade Acked-by: Eric Paris Tested-by: Seiji Munetoh Signed-off-by: James Morris --- drivers/char/tpm/tpm_tis.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'drivers/char/tpm/tpm_tis.c') diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index 0b73e4ec1ad..27e8de41530 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -257,6 +257,10 @@ out: return size; } +static int itpm; +module_param(itpm, bool, 0444); +MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)"); + /* * If interrupts are used (signaled by an irq set in the vendor structure) * tpm.c can skip polling for the data to be available as the interrupt is @@ -293,7 +297,7 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &chip->vendor.int_queue); status = tpm_tis_status(chip); - if ((status & TPM_STS_DATA_EXPECT) == 0) { + if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) { rc = -EIO; goto out_err; } @@ -467,6 +471,10 @@ 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 (itpm) + dev_info(dev, "Intel iTPM workaround enabled\n"); + + /* Figure out the capabilities */ intfcaps = ioread32(chip->vendor.iobase + -- cgit v1.2.3-70-g09d2 From 31bde71c202722a76686c3cf69a254c8a912275a Mon Sep 17 00:00:00 2001 From: Matt Domsch Date: Tue, 3 Nov 2009 12:05:50 +1100 Subject: tpm: autoload tpm_tis based on system PnP IDs The tpm_tis driver already has a list of supported pnp_device_ids. This patch simply exports that list as a MODULE_DEVICE_TABLE() so that the module autoloader will discover and load the module at boottime. Signed-off-by: Matt Domsch Acked-by: Rajiv Andrade Signed-off-by: Andrew Morton Signed-off-by: James Morris --- drivers/char/tpm/tpm_tis.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/char/tpm/tpm_tis.c') diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index 27e8de41530..2405f17b29d 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -637,6 +637,7 @@ static struct pnp_device_id tpm_pnp_tbl[] __devinitdata = { {"", 0}, /* User Specified */ {"", 0} /* Terminator */ }; +MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl); static __devexit void tpm_tis_pnp_remove(struct pnp_dev *dev) { -- cgit v1.2.3-70-g09d2