9020 sff/mt: fix bad gpio read on hwm patch

sff happened to work, but mt would not boot with the patch,
because it called die() on unknown chassis type, and the gpio
happened to have a bad value in the old patch, because it wasn't
reading the right gpio.

i tested the fix on the old patch, but then decided to use
mate's new patch because instead of calling die(), it simply
boots with fan control disabled (max fan speed in that case),
if this happens again.

mt and sff have both been tested with this new version of the
patch. both of them boot, and they both have proper fan control.

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 36 insertions, 28 deletions

diff --git a/config/coreboot/default/patches/0042-mb-dell-optiplex_9020-Implement-late-HWM-initializat.patch b/config/coreboot/default/patches/0042-mb-dell-optiplex_9020-Implement-late-HWM-initializat.patch
index f6bd1940..37353e20 100644
--- a/config/coreboot/default/patches/0042-mb-dell-optiplex_9020-Implement-late-HWM-initializat.patch
+++ b/config/coreboot/default/patches/0042-mb-dell-optiplex_9020-Implement-late-HWM-initializat.patch
@@ -1,13 +1,13 @@
-From f6340f3fe21e948ba94d0429467882c2fb90b77e Mon Sep 17 00:00:00 2001
+From c58e0fea2a4e591e5ecd8a1f376c3b3af0fbb306 Mon Sep 17 00:00:00 2001
 From: Mate Kukri <kukri.mate@gmail.com>
-Date: Sat, 6 Apr 2024 23:25:15 +0100
+Date: Thu, 18 Apr 2024 20:28:45 +0100
 Subject: [PATCH 1/1] mb/dell/optiplex_9020: Implement late HWM initialization
 
 There are 4 different chassis types specified by vendor firmware, each
 with a slightly different HWM configuration.
 
 The chassis type to use is determined at runtime by reading a set of
-4 PCH GPIOs: 70, 38, 17, and 0.
+4 PCH GPIOs: 70, 38, 17, and 1.
 
 Additionally vendor firmware also provides an option to run the fans at
 full speed. This is substituted with a coreboot nvram option in this
@@ -26,10 +26,10 @@ Signed-off-by: Mate Kukri <kukri.mate@gmail.com>
  src/mainboard/dell/optiplex_9020/bootblock.c  |  25 +-
  src/mainboard/dell/optiplex_9020/cmos.default |   1 +
  src/mainboard/dell/optiplex_9020/cmos.layout  |   5 +-
- src/mainboard/dell/optiplex_9020/mainboard.c  | 382 ++++++++++++++++++
+ src/mainboard/dell/optiplex_9020/mainboard.c  | 387 ++++++++++++++++++
  src/mainboard/dell/optiplex_9020/sch5555_ec.c |  54 +++
- src/mainboard/dell/optiplex_9020/sch5555_ec.h |   7 +
- 7 files changed, 455 insertions(+), 22 deletions(-)
+ src/mainboard/dell/optiplex_9020/sch5555_ec.h |  10 +
+ 7 files changed, 463 insertions(+), 22 deletions(-)
  create mode 100644 src/mainboard/dell/optiplex_9020/sch5555_ec.c
  create mode 100644 src/mainboard/dell/optiplex_9020/sch5555_ec.h
 
@@ -119,7 +119,7 @@ index 72ff9c4bee..4a1496a878 100644
  # coreboot config options: check sums
  984	16	h	0	check_sum
 diff --git a/src/mainboard/dell/optiplex_9020/mainboard.c b/src/mainboard/dell/optiplex_9020/mainboard.c
-index c834fea5d3..10b8aaca0e 100644
+index c834fea5d3..0b7829c736 100644
 --- a/src/mainboard/dell/optiplex_9020/mainboard.c
 +++ b/src/mainboard/dell/optiplex_9020/mainboard.c
 @@ -1,7 +1,12 @@
@@ -130,18 +130,19 @@ index c834fea5d3..10b8aaca0e 100644
  #include <device/device.h>
  #include <drivers/intel/gma/int15.h>
 +#include <option.h>
-+#include <southbridge/intel/lynxpoint/lp_gpio.h>
++#include <southbridge/intel/common/gpio.h>
 +#include "sch5555_ec.h"
  
  static void mainboard_enable(struct device *dev)
  {
-@@ -13,3 +18,380 @@ static void mainboard_enable(struct device *dev)
+@@ -13,3 +18,385 @@ static void mainboard_enable(struct device *dev)
  struct chip_operations mainboard_ops = {
  	.enable_dev = mainboard_enable,
  };
 +
-+#define HWM_TAB_ADD_TEMP_TARGET 1
++#define HWM_TAB_ADD_TEMP_TARGET	1
 +#define HWM_TAB_PKG_POWER_ANY	0xffff
++#define CHASSIS_TYPE_UNKNOWN	0xff
 +
 +struct hwm_tab_entry {
 +	uint16_t addr;
@@ -390,7 +391,7 @@ index c834fea5d3..10b8aaca0e 100644
 +
 +	// Read chassis type from GPIO
 +	gpio_chassis_type = get_gpio(70) << 3 | get_gpio(38) << 2 |
-+			    get_gpio(17) << 1 | get_gpio(0);
++			    get_gpio(17) << 1 | get_gpio(1);
 +
 +	printk(BIOS_DEBUG, "GPIO chassis type = %#x\n", gpio_chassis_type);
 +
@@ -408,7 +409,7 @@ index c834fea5d3..10b8aaca0e 100644
 +	case 0x0f:
 +		return 6;
 +	default:
-+		die("Unknown GPIO chassis type\n");
++		return CHASSIS_TYPE_UNKNOWN;
 +	}
 +
 +}
@@ -469,9 +470,15 @@ index c834fea5d3..10b8aaca0e 100644
 +	ec_write(1, 0x2fc, 0xa0);
 +	ec_write(1, 0x2fd, 0x32);
 +
-+	// Apply HWM table based on chassis type
 +	chassis_type = get_chassis_type();
-+	printk(BIOS_DEBUG, "Chassis type = %#x\n", chassis_type);
++
++	if (chassis_type != CHASSIS_TYPE_UNKNOWN) {
++		printk(BIOS_DEBUG, "Chassis type = %#x\n", chassis_type);
++	} else {
++		printk(BIOS_DEBUG, "WARNING: Unknown chassis type\n");
++	}
++
++	// Apply HWM table based on chassis type
 +	switch (chassis_type) {
 +	case 3:
 +		apply_hwm_tab(HWM_TAB3, ARRAY_SIZE(HWM_TAB3));
@@ -485,19 +492,17 @@ index c834fea5d3..10b8aaca0e 100644
 +	case 6:
 +		apply_hwm_tab(HWM_TAB6, ARRAY_SIZE(HWM_TAB6));
 +		break;
-+	default:
-+		die("Unknown chassis type\n");
 +	}
 +
-+	if (CONFIG_MAX_CPUS > 2) {
-+		ec_write(1, 0x9e, 0x30);
-+		ec_write(1, 0xeb, ec_read(1, 0xea));
-+	}
++	// NOTE: vendor firmware applies these when "max core address" > 2
++	// i think this is always the case
++	ec_write(1, 0x9e, 0x30);
++	ec_write(1, 0xeb, ec_read(1, 0xea));
 +
 +	ec_write(1, 0x2fc, saved_2fc);
 +
-+	// Apply full speed fan config if requested
-+	if (get_uint_option("fan_full_speed", 0)) {
++	// Apply full speed fan config if requested or if the chassis type is unknown
++	if (chassis_type == CHASSIS_TYPE_UNKNOWN || get_uint_option("fan_full_speed", 0)) {
 +		printk(BIOS_DEBUG, "Setting full fan speed\n");
 +		ec_write(1, 0x80, 0x60 | ec_read(1, 0x80));
 +		ec_write(1, 0x81, 0x60 | ec_read(1, 0x81));
@@ -518,7 +523,7 @@ index c834fea5d3..10b8aaca0e 100644
 +BOOT_STATE_INIT_ENTRY(BS_POST_DEVICE, BS_ON_EXIT, sch5555_ec_hwm_init, NULL);
 diff --git a/src/mainboard/dell/optiplex_9020/sch5555_ec.c b/src/mainboard/dell/optiplex_9020/sch5555_ec.c
 new file mode 100644
-index 0000000000..92244da9ab
+index 0000000000..a1067ac063
 --- /dev/null
 +++ b/src/mainboard/dell/optiplex_9020/sch5555_ec.c
 @@ -0,0 +1,54 @@
@@ -546,7 +551,7 @@ index 0000000000..92244da9ab
 +	outb(1, SCH555x_EMI_IOBASE);
 +
 +	// wait for ack
-+	for (size_t timeout = 0; timeout < 0xfff; ++timeout)
++	for (size_t retry = 0; retry < 0xfff; ++retry)
 +		if (inb(SCH555x_EMI_IOBASE + 1) & 1)
 +			break;
 +
@@ -572,23 +577,26 @@ index 0000000000..92244da9ab
 +	outb(1, SCH555x_EMI_IOBASE);
 +
 +	// wait for ack
-+	for (size_t timeout = 0; timeout < 0xfff; ++timeout)
++	for (size_t retry = 0; retry < 0xfff; ++retry)
 +		if (inb(SCH555x_EMI_IOBASE + 1) & 1)
 +			break;
 +}
 diff --git a/src/mainboard/dell/optiplex_9020/sch5555_ec.h b/src/mainboard/dell/optiplex_9020/sch5555_ec.h
 new file mode 100644
-index 0000000000..6e703ff865
+index 0000000000..7e399e8e74
 --- /dev/null
 +++ b/src/mainboard/dell/optiplex_9020/sch5555_ec.h
-@@ -0,0 +1,7 @@
+@@ -0,0 +1,10 @@
 +/* SPDX-License-Identifier: GPL-2.0-only */
 +
-+#pragma once
++#ifndef __SCH5555_EC_H__
++#define __SCH5555_EC_H__
 +
 +uint8_t ec_read(uint8_t addr1, uint16_t addr2);
 +
 +void ec_write(uint8_t addr1, uint16_t addr2, uint8_t val);
++
++#endif
 -- 
 2.39.2