config/coreboot/default: Update MEC5035 patches

- Update the MEC5035 S3 patches to the versions that were sent upstream
  to prevent conflicts with subsequent patches for that EC.
- Update the patch that enables the S3 SMI handler in mainboard code so
  that all Latitudes use the handler.
- Add a new patch that tells the EC to route power button events to the
  host so that the OS can decide what to do. Without it, the EC powers
  off the system without letting the OS cleanly shut down.

Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>

1 files changed, 147 insertions, 0 deletions

diff --git a/config/coreboot/default/patches/0038-ec-dell-mec5035-Add-S3-suspend-SMI-handler.patch b/config/coreboot/default/patches/0038-ec-dell-mec5035-Add-S3-suspend-SMI-handler.patch
new file mode 100644
index 00000000..7c96d9f9
--- /dev/null
+++ b/config/coreboot/default/patches/0038-ec-dell-mec5035-Add-S3-suspend-SMI-handler.patch
@@ -0,0 +1,147 @@
+From 762f5d95d2314c3d09c1562d36d111dcdb9c8b93 Mon Sep 17 00:00:00 2001
+From: Nicholas Chin <nic.c3.14@gmail.com>
+Date: Fri, 3 May 2024 11:03:32 -0600
+Subject: [PATCH 38/38] ec/dell/mec5035: Add S3 suspend SMI handler
+
+This is necessary for S3 resume to work on SNB and newer Dell Latitude
+laptops. If a command isn't sent, the EC cuts power to the DIMMs,
+preventing the system from resuming. These commands were found using an
+FPGA to log all LPC bus transactions between the host and the EC and
+then narrowing down which ones were actually necessary.
+
+Interestingly, the command IDs appear to be identical to those in
+ec/google/wilco, the EC used on Dell Latitude Chromebooks, and that EC
+implements a similar S3 SMI handler as the one implemented in this
+commit. The Wilco EC Kconfig does suggest that its firmware is a
+modified version of Dell's usual Latitude EC firmware, so the
+similarities seem to be intentional.
+
+These similarities also identified a command to enable or disable wake
+sources like the power button and lid switch, and this was added to the
+SMI handler to disable lid wake as the system does not yet resume
+properly from a like wake with coreboot.
+
+Tested on the Latitude E6430 (Ivy Bridge) and the Precision M6800
+(Haswell, not yet pushed).
+
+Change-Id: I655868aba46911d128f6c24f410dc6fdf83f3070
+Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
+---
+ src/ec/dell/mec5035/Makefile.mk  |  1 +
+ src/ec/dell/mec5035/mec5035.c    | 14 ++++++++++++++
+ src/ec/dell/mec5035/mec5035.h    | 22 ++++++++++++++++++++++
+ src/ec/dell/mec5035/smihandler.c | 17 +++++++++++++++++
+ 4 files changed, 54 insertions(+)
+ create mode 100644 src/ec/dell/mec5035/smihandler.c
+
+diff --git a/src/ec/dell/mec5035/Makefile.mk b/src/ec/dell/mec5035/Makefile.mk
+index 4ebdd811f9..be557e4599 100644
+--- a/src/ec/dell/mec5035/Makefile.mk
++++ b/src/ec/dell/mec5035/Makefile.mk
+@@ -5,5 +5,6 @@ ifeq ($(CONFIG_EC_DELL_MEC5035),y)
+ bootblock-y += mec5035.c
+ romstage-y += mec5035.c
+ ramstage-y += mec5035.c
++smm-y += mec5035.c smihandler.c
+ 
+ endif
+diff --git a/src/ec/dell/mec5035/mec5035.c b/src/ec/dell/mec5035/mec5035.c
+index dffbb7960c..85c2ab0140 100644
+--- a/src/ec/dell/mec5035/mec5035.c
++++ b/src/ec/dell/mec5035/mec5035.c
+@@ -94,6 +94,20 @@ void mec5035_control_radio(enum ec_radio_dev dev, enum ec_radio_state state)
+ 	ec_command(CMD_RADIO_CTRL);
+ }
+ 
++void mec5035_change_wake(u8 source, enum ec_wake_change change)
++{
++	u8 buf[ACPI_WAKEUP_NUM_ARGS] = {change, source, 0, 0x40};
++	write_mailbox_regs(buf, 2, ACPI_WAKEUP_NUM_ARGS);
++	ec_command(CMD_ACPI_WAKEUP_CHANGE);
++}
++
++void mec5035_sleep_enable(void)
++{
++	u8 buf[SLEEP_EN_NUM_ARGS] = {3, 0};
++	write_mailbox_regs(buf, 2, SLEEP_EN_NUM_ARGS);
++	ec_command(CMD_SLEEP_ENABLE);
++}
++
+ void mec5035_early_init(void)
+ {
+ 	/* If this isn't sent the EC shuts down the system after about 15
+diff --git a/src/ec/dell/mec5035/mec5035.h b/src/ec/dell/mec5035/mec5035.h
+index 32f791cb01..8d4fded28b 100644
+--- a/src/ec/dell/mec5035/mec5035.h
++++ b/src/ec/dell/mec5035/mec5035.h
+@@ -4,12 +4,15 @@
+ #define _EC_DELL_MEC5035_H_
+ 
+ #include <stdint.h>
++#include <types.h>
+ 
+ #define NUM_REGISTERS	32
+ 
+ enum mec5035_cmd {
+ 	CMD_MOUSE_TP = 0x1a,
+ 	CMD_RADIO_CTRL = 0x2b,
++	CMD_ACPI_WAKEUP_CHANGE = 0x4a,
++	CMD_SLEEP_ENABLE = 0x64,
+ 	CMD_CPU_OK = 0xc2,
+ };
+ 
+@@ -33,9 +36,28 @@ enum ec_radio_state {
+ 	RADIO_ON
+ };
+ 
++#define ACPI_WAKEUP_NUM_ARGS 4
++enum ec_wake_change {
++	WAKE_OFF = 0,
++	WAKE_ON
++};
++
++/* Copied from ec/google/wilco/commands.h. Not sure if these all apply */
++enum ec_acpi_wake_events {
++	EC_ACPI_WAKE_PWRB = BIT(0),     /* Wake up by power button */
++	EC_ACPI_WAKE_LID = BIT(1),      /* Wake up by lid switch */
++	EC_ACPI_WAKE_RTC = BIT(5),      /* Wake up by RTC */
++};
++
++#define SLEEP_EN_NUM_ARGS 2
++
+ u8 mec5035_mouse_touchpad(enum ec_mouse_setting setting);
+ void mec5035_cpu_ok(void);
+ void mec5035_early_init(void);
+ void mec5035_control_radio(enum ec_radio_dev device, enum ec_radio_state state);
++void mec5035_change_wake(u8 source, enum ec_wake_change change);
++void mec5035_sleep_enable(void);
++
++void mec5035_smi_sleep(int slp_type);
+ 
+ #endif /* _EC_DELL_MEC5035_H_ */
+diff --git a/src/ec/dell/mec5035/smihandler.c b/src/ec/dell/mec5035/smihandler.c
+new file mode 100644
+index 0000000000..958733bf97
+--- /dev/null
++++ b/src/ec/dell/mec5035/smihandler.c
+@@ -0,0 +1,17 @@
++/* SPDX-License-Identifier: GPL-2.0-only */
++
++#include <acpi/acpi.h>
++#include <console/console.h>
++#include <ec/acpi/ec.h>
++#include "mec5035.h"
++
++void mec5035_smi_sleep(int slp_type)
++{
++	switch (slp_type) {
++	case ACPI_S3:
++		/* System does not yet resume properly if woken by lid */
++		mec5035_change_wake(EC_ACPI_WAKE_LID, WAKE_OFF);
++		mec5035_sleep_enable();
++		break;
++	}
++}
+-- 
+2.47.0
+