badbcde542
Currently some of the LCM ID voltage gaps are below 100mV. For example, the voltage difference between ID 2 and 3 is 503-440=63mV. To reduce the risk of misrecognition from the hardware level, the voltages are adjusted so that all the voltage gaps are larger than 100mV. The RD2 resistor values are also updated. BUG=b:136987483 TEST=emerge-kukui coreboot Change-Id: Ib5c1f927fb54d8c9579f030e42eeec5a27daaceb Signed-off-by: Yu-Ping Wu <yupingso@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/34192 Reviewed-by: You-Cheng Syu <youcheng@google.com> Reviewed-by: Hung-Te Lin <hungte@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2018 MediaTek Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <assert.h>
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#include <boardid.h>
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#include <console/console.h>
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#include <soc/auxadc.h>
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#include <ec/google/chromeec/ec.h>
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#include <stddef.h>
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/* For CBI un-provisioned/corrupted Flapjack board. */
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#define FLAPJACK_UNDEF_SKU_ID 0
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#define ADC_LEVELS 12
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enum {
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LCM_ID_CHANNEL = 2, /* ID of LCD Module on schematics. */
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RAM_ID_CHANNEL = 3,
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SKU_ID_CHANNEL = 4,
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};
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static const int ram_voltages[ADC_LEVELS] = {
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/* ID : Voltage (unit: uV) */
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/* 0 : */ 74000,
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/* 1 : */ 212000,
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/* 2 : */ 319000,
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/* 3 : */ 429000,
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/* 4 : */ 542000,
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/* 5 : */ 666000,
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/* 6 : */ 781000,
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/* 7 : */ 900000,
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/* 8 : */ 1023000,
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/* 9 : */ 1137000,
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/* 10 : */ 1240000,
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/* 11 : */ 1343000,
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};
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static const int lcm_voltages[ADC_LEVELS] = {
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/* ID : Voltage (unit: uV) */
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/* 0 : */ 0,
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/* 1 : */ 283000,
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/* 2 : */ 394000,
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/* 3 : */ 503000,
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/* 4 : */ 608000,
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/* 5 : */ 712000,
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/* 6 : */ 823000,
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/* 7 : */ 937000,
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/* 8 : */ 1046000,
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/* 9 : */ 1155000,
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/* 10 : */ 1277000,
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/* 11 : */ 1434000,
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};
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static const int *adc_voltages[] = {
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[LCM_ID_CHANNEL] = lcm_voltages,
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[RAM_ID_CHANNEL] = ram_voltages,
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[SKU_ID_CHANNEL] = ram_voltages, /* SKU ID is sharing RAM voltages. */
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};
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static uint32_t get_adc_index(unsigned int channel)
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{
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int value = auxadc_get_voltage(channel);
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assert(channel < ARRAY_SIZE(adc_voltages));
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const int *voltages = adc_voltages[channel];
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assert(voltages);
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/* Find the closest voltage */
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uint32_t id;
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for (id = 0; id < ADC_LEVELS - 1; id++)
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if (value < (voltages[id] + voltages[id + 1]) / 2)
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break;
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printk(BIOS_DEBUG, "ADC[%d]: Raw value=%d ID=%d\n", channel, value, id);
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return id;
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}
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/* board_id is provided by ec/google/chromeec/ec_boardid.c */
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uint32_t sku_id(void)
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{
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static uint32_t cached_sku_id = BOARD_ID_INIT;
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if (cached_sku_id != BOARD_ID_INIT)
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return cached_sku_id;
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/* On Flapjack, getting the SKU via CBI. */
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if (CONFIG(BOARD_GOOGLE_FLAPJACK)) {
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if (google_chromeec_cbi_get_sku_id(&cached_sku_id))
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cached_sku_id = FLAPJACK_UNDEF_SKU_ID;
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return cached_sku_id;
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}
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/* Quirk for Kukui: All Rev1/Sku0 had incorrectly set SKU_ID=1. */
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if (CONFIG(BOARD_GOOGLE_KUKUI)) {
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if (board_id() == 1) {
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cached_sku_id = 0;
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return cached_sku_id;
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}
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}
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/*
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* The SKU (later used for device tree matching) is combined from:
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* ADC2[4bit/H] = straps on LCD module (type of panel).
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* ADC4[4bit/L] = SKU ID from board straps.
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*/
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cached_sku_id = (get_adc_index(LCM_ID_CHANNEL) << 4 |
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get_adc_index(SKU_ID_CHANNEL));
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return cached_sku_id;
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}
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uint32_t ram_code(void)
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{
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static uint32_t cached_ram_code = BOARD_ID_INIT;
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if (cached_ram_code == BOARD_ID_INIT)
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cached_ram_code = get_adc_index(RAM_ID_CHANNEL);
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return cached_ram_code;
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}
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