diff options
Diffstat (limited to 'src/drivers/spi/tpm/tpm.c')
| -rw-r--r-- | src/drivers/spi/tpm/tpm.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/drivers/spi/tpm/tpm.c b/src/drivers/spi/tpm/tpm.c index 58bf842267..c09462e783 100644 --- a/src/drivers/spi/tpm/tpm.c +++ b/src/drivers/spi/tpm/tpm.c @@ -37,6 +37,8 @@ #define TPM_RID_REG (TPM_LOCALITY_0_SPI_BASE + 0xf04) #define TPM_FW_VER (TPM_LOCALITY_0_SPI_BASE + 0xf90) +#define CR50_TIMEOUT_INIT_MS 30000 /* Very long timeout for TPM init */ + /* SPI slave structure for TPM device. */ static struct spi_slave g_spi_slave CAR_GLOBAL; @@ -342,6 +344,7 @@ static void tpm2_write_access_reg(uint8_t cmd) static int tpm2_claim_locality(void) { uint8_t access; + struct stopwatch sw; access = tpm2_read_access_reg(); /* @@ -353,6 +356,13 @@ static int tpm2_claim_locality(void) access = tpm2_read_access_reg(); } + /* + * If cr50 is doing a long crypto operation, it can take up to + * 30 seconds to get a valid status value back + */ + stopwatch_init_msecs_expire(&sw, CR50_TIMEOUT_INIT_MS); + while (!stopwatch_expired(&sw) && access != TPM_ACCESS_VALID) + access = tpm2_read_access_reg(); if (access != TPM_ACCESS_VALID) { printk(BIOS_ERR, "Invalid reset status: %#x\n", access); return 0; |