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authorMartin Wilck <Martin.Wilck@ts.fujitsu.com>2015-11-09 17:38:50 +0300
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2015-11-09 18:52:54 +0300
commit14b5c1c9159bf6f109b667d31da82859d8c8cdcd (patch)
treea87c5b9fefeeee58a28777dff292eab58210f827 /drivers/char
parent2aef9da60bfdeb68dbcd4f114c098cbaa841b4ee (diff)
downloadlinux-14b5c1c9159bf6f109b667d31da82859d8c8cdcd.tar.xz
tpm_tis: restore IRQ vector in IO memory after failed probing
If the probing finishes without success, it will leave the value 15 in the TPM_IRQ_VECTOR register. If the driver is unloaded and reloaded, it will "think" that the hardware had been programmed with IRQ 15, and will not probe again. This patch restores the original value in the IO memory if no IRQ is probed. Signed-off-by: Martin Wilck <Martin.Wilck@ts.fujitsu.com> Acked-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Acked-by: Peter Huewe <PeterHuewe@gmx.de>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/tpm_tis.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 19f9c7dc7bc0..65f7eecc45b0 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -645,6 +645,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
{
u32 vendor, intfcaps, intmask;
int rc, i, irq_s, irq_e, probe;
+ int irq_r = -1;
struct tpm_chip *chip;
struct priv_data *priv;
@@ -751,6 +752,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
irq_s =
ioread8(chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
+ irq_r = irq_s;
if (irq_s) {
irq_e = irq_s;
} else {
@@ -833,7 +835,9 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.locality));
}
- }
+ } else if (irq_r != -1)
+ iowrite8(irq_r, chip->vendor.iobase +
+ TPM_INT_VECTOR(chip->vendor.locality));
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
chip->vendor.timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);