drivers/intel/fsp2_0: Refactor MultiPhaseSiInit API calling method

FspMultiPhaseSiInit API was introduced with FSP 2.2 specification
onwards. EnableMultiPhaseSiliconInit is an arch UPD also introduced
as part of FSP 2.2 specification to allow calling FspMultiPhaseSiInit
API.

However, some platforms adhere to the FSP specification but
don't have arch UPD structure, for example : JSL, TGL and Xeon-SP.

Out of these platforms, TGL supports calling of FspMultiPhaseSiInit
API and considered EnableMultiPhaseSiliconInit as a platform-specific
UPD rather than an arch UPD to allow calling into FspMultiPhaseSiInit
API.

It is important to ensure that the UPD setting and the callback for
MultiPhaseInit are kept in sync, else it could result in broken
behavior e.g. a hang is seen in FSP if EnableMultiPhaseSiliconInit
UPD is set to 1 but the FspMultiPhaseSiInit API call is skipped.

This patch provides an option for users to choose to bypass calling
into MultiPhaseSiInit API and ensures the EnableMultiPhaseSiliconInit
UPD is set to its default state as `disable` so that FSP-S don't
consider MultiPhaseSiInit API is a mandatory entry point prior to
calling other FSP API entry points.

List of changes:
1. Add `FSPS_HAS_ARCH_UPD` Kconfig for SoC to select if
`FSPS_ARCH_UPD` structure is part of `FSPS_UPD` structure.
2. Drop `soc_fsp_multi_phase_init_is_enable()` from JSL and Xeon-SP
SoCs, a SoC override to callout that SoC doesn't support calling
MultiPhase Si Init is no longer required.
3. Add `FSPS_USE_MULTI_PHASE_INIT` Kconfig for SoC to specify if
SoC users want to enable `EnableMultiPhaseSiliconInit` arch UPD (using
`fsp_fill_common_arch_params()`) and execute FspMultiPhaseSiInit() API.
4. Presently selects `FSPS_USE_MULTI_PHASE_INIT` from IA TCSS common
code.
5. Add `fsp_is_multi_phase_init_enabled()` that check applicability of
MultiPhase Si Init prior calling FspMultiPhaseSiInit() API to
honor SoC users' decision.
6. Drop `arch_silicon_init_params()` from SoC as FSP driver (FSP 2.2)
would check the applicability of MultiPhase Si Init prior calling
FspMultiPhaseSiInit() API.

Additionally, selects FSPS_HAS_ARCH_UPD for Alder Lake as Alder Lake
FSPS_UPD structure has `FSPS_ARCH_UPD` structure and drops
`arch_silicon_init_params()` from SoC
`platform_fsp_silicon_init_params_cb()`.

Skip EnableMultiPhaseSiliconInit hardcoding for Tiger Lake and uses
the fsp_is_multi_phase_init_enabled() function to override
EnableMultiPhaseSiliconInit UPD prior calling MultiPhaseSiInit FSP API.

TEST=EnableMultiPhaseSiliconInit UPD is getting set or reset based on
SoC user selects FSPS_USE_MULTI_PHASE_INIT Kconfig.

Change-Id: I019fa8364605f5061d56e2d80b20e1a91857c423
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56382
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

2 files changed, 1 insertions, 8 deletions

diff --git a/src/soc/intel/alderlake/Kconfig b/src/soc/intel/alderlake/Kconfig
index 0b28938401..915dd3f381 100644
--- a/src/soc/intel/alderlake/Kconfig
+++ b/src/soc/intel/alderlake/Kconfig
@@ -24,6 +24,7 @@ config CPU_SPECIFIC_OPTIONS
 	select FAST_SPI_SUPPORTS_EXT_BIOS_WINDOW
 	select FSP_M_XIP
 	select FSP_STATUS_GLOBAL_RESET_REQUIRED_3
+	select FSPS_HAS_ARCH_UPD
 	select GENERIC_GPIO_LIB
 	select HAVE_FSP_GOP
 	select INTEL_DESCRIPTOR_MODE_CAPABLE
diff --git a/src/soc/intel/alderlake/fsp_params.c b/src/soc/intel/alderlake/fsp_params.c
index 107d22e9e4..541a9612d8 100644
--- a/src/soc/intel/alderlake/fsp_params.c
+++ b/src/soc/intel/alderlake/fsp_params.c
@@ -672,12 +672,6 @@ static void fill_fsps_fivr_params(FSP_S_CONFIG *s_cfg,
 			config->ext_fivr_settings.vnn_icc_max_ma;
 }
 
-static void arch_silicon_init_params(FSPS_ARCH_UPD *s_arch_cfg)
-{
-	/* EnableMultiPhaseSiliconInit for running MultiPhaseSiInit */
-	s_arch_cfg->EnableMultiPhaseSiliconInit = 1;
-}
-
 static void soc_silicon_init_params(FSP_S_CONFIG *s_cfg,
 		struct soc_intel_alderlake_config *config)
 {
@@ -718,10 +712,8 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 {
 	struct soc_intel_alderlake_config *config;
 	FSP_S_CONFIG *s_cfg = &supd->FspsConfig;
-	FSPS_ARCH_UPD *s_arch_cfg = &supd->FspsArchUpd;
 
 	config = config_of_soc();
-	arch_silicon_init_params(s_arch_cfg);
 	soc_silicon_init_params(s_cfg, config);
 	mainboard_silicon_init_params(s_cfg);
 }