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authorDuncan Laurie <dlaurie@chromium.org>2016-11-01 15:03:13 -0700
committerMartin Roth <martinroth@google.com>2016-11-07 20:38:45 +0100
commited4fa099d9583f33130eae97827e63d41d203ff9 (patch)
treef7f0c609001e4e6ee44d2730af48d92d5c82f45a /src/drivers/i2c/tpm
parenta84fa908e2f8c25b21cb0017ff6bc80ee2d22ff3 (diff)
downloadcoreboot-ed4fa099d9583f33130eae97827e63d41d203ff9.tar.xz
drivers/i2c/tpm/cr50: Increase IRQ timeout
Increase the IRQ timeout to prevent issues if there is a delay in the TPM responding to a command. Split the no-IRQ case out so it doesn't suffer unnecessarily. BUG=chrome-os-partner:59191 TEST=suspend/resume testing on eve board Change-Id: I1ea7859bc7a056a450b2b0ee32153ae43ee8699f Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: https://review.coreboot.org/17204 Reviewed-by: Furquan Shaikh <furquan@google.com> Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src/drivers/i2c/tpm')
-rw-r--r--src/drivers/i2c/tpm/cr50.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/src/drivers/i2c/tpm/cr50.c b/src/drivers/i2c/tpm/cr50.c
index f7e667b1d9..0877de01ea 100644
--- a/src/drivers/i2c/tpm/cr50.c
+++ b/src/drivers/i2c/tpm/cr50.c
@@ -48,6 +48,8 @@
#define CR50_MAX_BUFSIZE 63
#define CR50_TIMEOUT_LONG_MS 2000 /* Long timeout while waiting for TPM */
#define CR50_TIMEOUT_SHORT_MS 2 /* Short timeout during transactions */
+#define CR50_TIMEOUT_NOIRQ_MS 20 /* Timeout for TPM ready without IRQ */
+#define CR50_TIMEOUT_IRQ_MS 100 /* Timeout for TPM ready with IRQ */
#define CR50_DID_VID 0x00281ae0L
struct tpm_inf_dev {
@@ -65,11 +67,11 @@ static int cr50_i2c_wait_tpm_ready(struct tpm_chip *chip)
if (!chip->vendor.irq_status) {
/* Fixed delay if interrupt not supported */
- mdelay(CR50_TIMEOUT_SHORT_MS);
+ mdelay(CR50_TIMEOUT_NOIRQ_MS);
return 0;
}
- stopwatch_init_msecs_expire(&sw, 5 * CR50_TIMEOUT_SHORT_MS);
+ stopwatch_init_msecs_expire(&sw, CR50_TIMEOUT_IRQ_MS);
while (!chip->vendor.irq_status(chip->vendor.irq))
if (stopwatch_expired(&sw))
@@ -429,6 +431,11 @@ static void cr50_vendor_init(struct tpm_chip *chip)
chip->vendor.irq = -1;
#endif
}
+
+ if (chip->vendor.irq <= 0)
+ printk(BIOS_WARNING,
+ "%s: No IRQ, will use %ums delay for TPM ready\n",
+ __func__, CR50_TIMEOUT_NOIRQ_MS);
}
int tpm_vendor_probe(unsigned bus, uint32_t addr)