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soc/intel/alderlake: Update LidStatus UPD dynamically 

This patch ensures that the LidStatus UPD is passed a dynamic value,
rather than always passing 1 (CONFIG_RUN_FSP_GOP enabled) for FSP 2.0
devices.

Problem statement:
* FSP-S GFX PEIM initializes the on-board display (eDP) even when the
  LID is physically closed, because LidStatus is always set to 1.
* FSP-S skips external display initialization even when the LID is
  closed.

Solution:
* FSP-S GFX PEIM module understands the presence of an external display
  if LidStatus is not set, and tries to probe the other display
  endpoint.
* Statically passing LidStatus as always enabled (aka 1) does not
  illustrate the exact device scenarios, so this patch updates
  LidStatus dynamically by reading the EC memory map offset.

BUG=b:313886118
TEST=Able to build and boot google/marasov to redirect the display
using external HDMI monitor while LID is closed.

Change-Id: Idb1d71bd54837630f36d43a45effc53d35f9cb70
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79352
Reviewed-by: Eric Lai <ericllai@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Subrata Banik 2023-11-30 19:09:46 +05:30
parent d982274a4e
commit 72d616c22c
1 changed files with 2 additions and 1 deletions
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3
src/soc/intel/alderlake/fsp_params.c
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@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <assert.h>
#include <bootmode.h>
#include <bootsplash.h>
#include <console/console.h>
#include <cpu/intel/microcode.h>
@ -637,7 +638,7 @@ static void fill_fsps_igd_params(FSP_S_CONFIG *s_cfg,
/* Check if IGD is present and fill Graphics init param accordingly */
s_cfg->PeiGraphicsPeimInit = CONFIG(RUN_FSP_GOP) && is_devfn_enabled(SA_DEVFN_IGD);
s_cfg->LidStatus = CONFIG(RUN_FSP_GOP);
s_cfg->LidStatus = CONFIG(VBOOT_LID_SWITCH) ? get_lid_switch() : CONFIG(RUN_FSP_GOP);
s_cfg->PavpEnable = CONFIG(PAVP);
}