5 files changed, 60 insertions, 28 deletions

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index c10a4aa97373..cd48033b804a 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -571,6 +571,10 @@ static int tpm_hwrng_read(struct hwrng *rng, void *data, size_t max, bool wait)
 {
 	struct tpm_chip *chip = container_of(rng, struct tpm_chip, hwrng);
 
+	/* Give back zero bytes, as TPM chip has not yet fully resumed: */
+	if (chip->flags & TPM_CHIP_FLAG_SUSPENDED)
+		return 0;
+
 	return tpm_get_random(chip, data, max);
 }
 
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 4463d0018290..586ca10b0d72 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -412,6 +412,8 @@ int tpm_pm_suspend(struct device *dev)
 	}
 
 suspended:
+	chip->flags |= TPM_CHIP_FLAG_SUSPENDED;
+
 	if (rc)
 		dev_err(dev, "Ignoring error %d while suspending\n", rc);
 	return 0;
@@ -429,6 +431,14 @@ int tpm_pm_resume(struct device *dev)
 	if (chip == NULL)
 		return -ENODEV;
 
+	chip->flags &= ~TPM_CHIP_FLAG_SUSPENDED;
+
+	/*
+	 * Guarantee that SUSPENDED is written last, so that hwrng does not
+	 * activate before the chip has been fully resumed.
+	 */
+	wmb();
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(tpm_pm_resume);
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 7af389806643..7db3593941ea 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -122,6 +122,29 @@ static const struct dmi_system_id tpm_tis_dmi_table[] = {
 			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T490s"),
 		},
 	},
+	{
+		.callback = tpm_tis_disable_irq,
+		.ident = "ThinkStation P360 Tiny",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkStation P360 Tiny"),
+		},
+	},
+	{
+		.callback = tpm_tis_disable_irq,
+		.ident = "ThinkPad L490",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad L490"),
+		},
+	},
+	{
+		.callback = tpm_tis_disable_irq,
+		.ident = "UPX-TGL",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "AAEON"),
+		},
+	},
 	{}
 };
 
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 02945d53fcef..558144fa707a 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -1209,25 +1209,20 @@ static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
 	u32 intmask;
 	int rc;
 
-	if (chip->ops->clk_enable != NULL)
-		chip->ops->clk_enable(chip, true);
-
-	/* reenable interrupts that device may have lost or
-	 * BIOS/firmware may have disabled
+	/*
+	 * Re-enable interrupts that device may have lost or BIOS/firmware may
+	 * have disabled.
 	 */
 	rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq);
-	if (rc < 0)
-		goto out;
+	if (rc < 0) {
+		dev_err(&chip->dev, "Setting IRQ failed.\n");
+		return;
+	}
 
 	intmask = priv->int_mask | TPM_GLOBAL_INT_ENABLE;
-
-	tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
-
-out:
-	if (chip->ops->clk_enable != NULL)
-		chip->ops->clk_enable(chip, false);
-
-	return;
+	rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
+	if (rc < 0)
+		dev_err(&chip->dev, "Enabling interrupts failed.\n");
 }
 
 int tpm_tis_resume(struct device *dev)
@@ -1235,27 +1230,27 @@ int tpm_tis_resume(struct device *dev)
 	struct tpm_chip *chip = dev_get_drvdata(dev);
 	int ret;
 
-	ret = tpm_tis_request_locality(chip, 0);
-	if (ret < 0)
+	ret = tpm_chip_start(chip);
+	if (ret)
 		return ret;
 
 	if (chip->flags & TPM_CHIP_FLAG_IRQ)
 		tpm_tis_reenable_interrupts(chip);
 
-	ret = tpm_pm_resume(dev);
-	if (ret)
-		goto out;
-
 	/*
 	 * TPM 1.2 requires self-test on resume. This function actually returns
 	 * an error code but for unknown reason it isn't handled.
 	 */
 	if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
 		tpm1_do_selftest(chip);
-out:
-	tpm_tis_relinquish_locality(chip, 0);
 
-	return ret;
+	tpm_chip_stop(chip);
+
+	ret = tpm_pm_resume(dev);
+	if (ret)
+		return ret;
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(tpm_tis_resume);
 #endif
diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h
index e978f457fd4d..610bfadb6acf 100644
--- a/drivers/char/tpm/tpm_tis_core.h
+++ b/drivers/char/tpm/tpm_tis_core.h
@@ -84,10 +84,10 @@ enum tis_defaults {
 #define ILB_REMAP_SIZE			0x100
 
 enum tpm_tis_flags {
-	TPM_TIS_ITPM_WORKAROUND		= BIT(0),
-	TPM_TIS_INVALID_STATUS		= BIT(1),
-	TPM_TIS_DEFAULT_CANCELLATION	= BIT(2),
-	TPM_TIS_IRQ_TESTED		= BIT(3),
+	TPM_TIS_ITPM_WORKAROUND		= 0,
+	TPM_TIS_INVALID_STATUS		= 1,
+	TPM_TIS_DEFAULT_CANCELLATION	= 2,
+	TPM_TIS_IRQ_TESTED		= 3,
 };
 
 struct tpm_tis_data {