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soc/intel/pantherlake: Reduce IGD stolen memory size from 128MB to 64MB

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This commit updates the pre-allocated IGD stolen memory size for Intel
Panther Lake SoCs from 128MB to 64MB within the FSP-M configuration
parameters.

Reducing the IGD stolen memory allocation from 128MB to 64MB
significantly optimizes system memory resource utilization (by 64MB).

Furthermore, this reduction frees one MTRR. Previously, the 128MB IGD
allocation consumed all 10 available BIOS MTRRs; the new 64MB allocation
now leaves MTRR index 9 available.

BUG=b:413638298
TEST=Able to boot google/fatcat to OS w/ internal and/or external
display attached.

Change-Id: Ifd60973bc5d37cbbc4ea6c8eaf5d851069d53083
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87460
Reviewed-by: Jérémy Compostella <jeremy.compostella@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Subrata Banik 2025-04-26 22:56:14 +05:30
commit e2705d93d8
1 changed files with 2 additions and 2 deletions
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4
src/soc/intel/pantherlake/romstage/fsp_params.c
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@ -36,8 +36,8 @@ static void fill_fspm_igd_params(FSP_M_CONFIG *m_cfg,
};
m_cfg->InternalGraphics = !CONFIG(SOC_INTEL_DISABLE_IGD) && is_devfn_enabled(PCI_DEVFN_IGD);
if (m_cfg->InternalGraphics) {
/* IGD is enabled, set IGD stolen size to 128MB. */
m_cfg->IgdDvmt50PreAlloc = IGD_SM_128MB;
/* IGD is enabled, set IGD stolen size to 64MB. */
m_cfg->IgdDvmt50PreAlloc = IGD_SM_64MB;
/* DP port config */
m_cfg->DdiPortAConfig = config->ddi_port_A_config;
m_cfg->DdiPortBConfig = config->ddi_port_B_config;