Tim Wawrzynczak has submitted this change. ( https://review.coreboot.org/c/coreboot/+/63011 )
Change subject: drivers/i2c/tpm: Work around missing board_cfg in Ti50 FW under 0.15 ......................................................................
drivers/i2c/tpm: Work around missing board_cfg in Ti50 FW under 0.15
Ti50 FW under 0.15 is not support board cfg command which causes I2C errors and entering recovery mode. And ODM stocks are 0.12 pre-flashed. Add workaround for the old Ti50 chip.
BUG=b:224650720 TEST=no I2C errors in coreboot. [ERROR] cr50_i2c_read: Address write failed [INFO ] .I2C stop bit not received
Signed-off-by: Eric Lai eric_lai@quanta.corp-partner.google.com Change-Id: Ieec7842ca66b4c690df04a400cebcf45138c745d Reviewed-on: https://review.coreboot.org/c/coreboot/+/63011 Tested-by: build bot (Jenkins) no-reply@coreboot.org Reviewed-by: Tim Wawrzynczak twawrzynczak@chromium.org Reviewed-by: Kangheui Won khwon@chromium.org --- M src/drivers/i2c/tpm/Kconfig M src/drivers/i2c/tpm/cr50.c M src/mainboard/google/brya/Kconfig 3 files changed, 13 insertions(+), 1 deletion(-)
Approvals: build bot (Jenkins): Verified Tim Wawrzynczak: Looks good to me, approved Kangheui Won: Looks good to me, approved
diff --git a/src/drivers/i2c/tpm/Kconfig b/src/drivers/i2c/tpm/Kconfig index dcf9060..0d5f06b 100644 --- a/src/drivers/i2c/tpm/Kconfig +++ b/src/drivers/i2c/tpm/Kconfig @@ -24,6 +24,15 @@ help Board has a generic I2C TPM support
+config MAINBOARD_NEEDS_I2C_TI50_WORKAROUND + bool + default n + help + Ti50 FW versions below 0.15 don't support the firmware_version or board_cfg registers, + and trying to access them causes I2C errors. This config will skip accesses to these + registers, and should be selected for boards using Ti50 chips with FW < 0.15. The config + will be removed once all Ti50 stocks are updated to 0.15 or higher. + config DRIVER_TIS_DEFAULT bool depends on I2C_TPM diff --git a/src/drivers/i2c/tpm/cr50.c b/src/drivers/i2c/tpm/cr50.c index ce2278b..7eb066d 100644 --- a/src/drivers/i2c/tpm/cr50.c +++ b/src/drivers/i2c/tpm/cr50.c @@ -500,7 +500,9 @@ printk(BIOS_DEBUG, "cr50 TPM 2.0 (i2c %u:0x%02x id 0x%x)\n", bus, dev_addr, did_vid >> 16);
- if (tpm_first_access_this_boot()) { + /* Ti50 FW version under 0.15 doesn't support board cfg command + TODO: remove this flag after all stocks Ti50 uprev to 0.15 or above */ + if (!CONFIG(MAINBOARD_NEEDS_I2C_TI50_WORKAROUND) && tpm_first_access_this_boot()) { /* This is called for the side-effect of printing the version string. */ cr50_get_firmware_version(&ver); cr50_set_board_cfg(); diff --git a/src/mainboard/google/brya/Kconfig b/src/mainboard/google/brya/Kconfig index 199db11..2599587 100644 --- a/src/mainboard/google/brya/Kconfig +++ b/src/mainboard/google/brya/Kconfig @@ -60,6 +60,7 @@ def_bool n select BOARD_GOOGLE_BRYA_COMMON select CHROMEOS_DRAM_PART_NUMBER_IN_CBI if CHROMEOS + select MAINBOARD_NEEDS_I2C_TI50_WORKAROUND select MEMORY_SOLDERDOWN select SOC_INTEL_ALDERLAKE_PCH_N select SOC_INTEL_CSE_LITE_COMPRESS_ME_RW