tpm: rework tpm_get_timeouts()

BugLink: http://bugs.launchpad.net/bugs/1398274

IRQ probing needs to know that the TPM is working before trying to
probe, so move tpm_get_timeouts() to the top of the tpm_tis_init().
This has the advantage of also getting the correct timeouts loaded
before doing IRQ probing.

All the timeout handling code is moved to tpm_get_timeouts() in order to
remove duplicate code in tpm_tis and tpm_crb.

[jarkko.sakkinen@linux.intel.com: squashed two patches together and
improved the commit message.]
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Martin Wilck <Martin.Wilck@ts.fujitsu.com>
Tested-by: Scot Doyle <lkml14@scotdoyle.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Peter Huewe <peterhuewe@gmx.de>
(cherry picked from commit 25112048)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/char/tpm/tpm-interface.c

@@ -503,6 +503,21 @@ int tpm_get_timeouts(struct tpm_chip *chip)
 	struct duration_t *duration_cap;
 	ssize_t rc;
 
+	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+		/* Fixed timeouts for TPM2 */
+		chip->vendor.timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
+		chip->vendor.timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
+		chip->vendor.timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
+		chip->vendor.timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
+		chip->vendor.duration[TPM_SHORT] =
+		    msecs_to_jiffies(TPM2_DURATION_SHORT);
+		chip->vendor.duration[TPM_MEDIUM] =
+		    msecs_to_jiffies(TPM2_DURATION_MEDIUM);
+		chip->vendor.duration[TPM_LONG] =
+		    msecs_to_jiffies(TPM2_DURATION_LONG);
+		return 0;
+	}
+
 	tpm_cmd.header.in = tpm_getcap_header;
 	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);

drivers/char/tpm/tpm_crb.c

@@ -284,17 +284,9 @@ static int crb_acpi_add(struct acpi_device *device)
 
 	chip->vendor.priv = priv;
 
-	/* Default timeouts and durations */
-	chip->vendor.timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
-	chip->vendor.timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
-	chip->vendor.timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
-	chip->vendor.timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
-	chip->vendor.duration[TPM_SHORT] =
-		msecs_to_jiffies(TPM2_DURATION_SHORT);
-	chip->vendor.duration[TPM_MEDIUM] =
-		msecs_to_jiffies(TPM2_DURATION_MEDIUM);
-	chip->vendor.duration[TPM_LONG] =
-		msecs_to_jiffies(TPM2_DURATION_LONG);
+	rc = tpm_get_timeouts(chip);
+	if (rc)
+		return rc;
 
 	chip->acpi_dev_handle = device->handle;
 

drivers/char/tpm/tpm_tis.c

@@ -740,6 +740,16 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
 	if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
 		dev_dbg(dev, "\tData Avail Int Support\n");
 
+	/* Very early on issue a command to the TPM in polling mode to make
+	 * sure it works. May as well use that command to set the proper
+	 *  timeouts for the driver.
+	 */
+	if (tpm_get_timeouts(chip)) {
+		dev_err(dev, "Could not get TPM timeouts and durations\n");
+		rc = -ENODEV;
+		goto out_err;
+	}
+
 	/* INTERRUPT Setup */
 	init_waitqueue_head(&chip->vendor.read_queue);
 	init_waitqueue_head(&chip->vendor.int_queue);
@@ -837,18 +847,13 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
 		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);
-		chip->vendor.timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
-		chip->vendor.timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
-		chip->vendor.timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
-		chip->vendor.duration[TPM_SHORT] =
-			msecs_to_jiffies(TPM2_DURATION_SHORT);
-		chip->vendor.duration[TPM_MEDIUM] =
-			msecs_to_jiffies(TPM2_DURATION_MEDIUM);
-		chip->vendor.duration[TPM_LONG] =
-			msecs_to_jiffies(TPM2_DURATION_LONG);
+	if (tpm_get_timeouts(chip)) {
+		dev_err(dev, "Could not get TPM timeouts and durations\n");
+		rc = -ENODEV;
+		goto out_err;
+	}
 
+	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
 		rc = tpm2_do_selftest(chip);
 		if (rc == TPM2_RC_INITIALIZE) {
 			dev_warn(dev, "Firmware has not started TPM\n");
@@ -864,12 +869,6 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
 			goto out_err;
 		}
 	} else {
-		if (tpm_get_timeouts(chip)) {
-			dev_err(dev, "Could not get TPM timeouts and durations\n");
-			rc = -ENODEV;
-			goto out_err;
-		}
-
 		if (tpm_do_selftest(chip)) {
 			dev_err(dev, "TPM self test failed\n");
 			rc = -ENODEV;