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soc/intel/cse: Check PSR bit before issuing PSR backup command 

Get PSR bit state using MKHI_FWCAPS_GET_FW_FEATURE_STATE HECI command
Use this bit info to check if SKU supports PSR and consequently issue
PSR_HECI_FW_DOWNGRADE_BACKUP command for PSR data backup during
downgrade.

BUG=b:273207144
TEST=build CB image and boot on google/rex board. Check for
"PSR is supported in this SKU" message in coreboot logs to confirm
that PSR bit is set in SKU

Signed-off-by: Anil Kumar <anil.kumar.k@intel.com>
Change-Id: I6e92341a9dc799146eb8f1a70b3a4a16fd1aa0ae
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74874
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
This commit is contained in:
Anil Kumar 2023-05-01 11:44:47 -07:00 committed by Subrata Banik
parent 7b2edc3b6b
commit a2d10bb029
2 changed files with 33 additions and 1 deletions
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32
src/soc/intel/common/block/cse/cse_lite.c
View File

@ -1065,6 +1065,28 @@ static bool is_psr_data_backed_up(void)
return (get_psr_backup_status() == PSR_BACKUP_DONE);
}
static bool is_psr_supported(void)
{
uint32_t feature_status;
/*
* Check if SoC has support for PSR feature typically PSR feature
* is only supported by vpro SKU
*
*/
if (cse_get_fw_feature_state(&feature_status) != CB_SUCCESS) {
printk(BIOS_ERR, "cse_get_fw_feature_state command failed !\n");
return false;
}
if (!(feature_status & ME_FW_FEATURE_PSR)) {
printk(BIOS_DEBUG, "PSR is not supported in this SKU !\n");
return false;
}
return true;
}
/*
* PSR data needs to be backed up prior to downgrade. So switch the CSE boot mode to RW, send
* PSR back-up command to CSE and update the PSR back-up state in CMOS.
@ -1076,6 +1098,16 @@ static void backup_psr_data(void)
if (cse_boot_to_rw() != CB_SUCCESS)
goto update_and_exit;
/*
* The function to check for PSR feature support can only be called after
* switching to RW partition. The command MKHI_FWCAPS_GET_FW_FEATURE_STATE
* that gives feature state is supported by a process that is loaded only
* when CSE boots from RW.
*
*/
if (!is_psr_supported())
goto update_and_exit;
/*
* Prerequisites:
* 1) HFSTS1 Current Working State is Normal

2
src/soc/intel/common/block/include/intelblocks/cse.h
View File

@ -40,7 +40,7 @@ enum mkhi_group_id {
/* Get Firmware Feature State Command Id */
#define MKHI_FWCAPS_GET_FW_FEATURE_STATE 0x02
#define ME_FEATURE_STATE_RULE_ID 0x20
#define ME_FW_FEATURE_PSR BIT(5)
/* MEI bus disable command. Must be sent to MEI client endpoint, not MKHI */
#define MEI_BUS_DISABLE_COMMAND 0xc