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soc/amd/picasso: add dptc support 

add dptc support for different power parameter on tablet/clamshell mode

The BIOS may choose to adjust power and/or thermal parameters at its own
discretion. The DPTC interface(DPTCi) ALIB Function adds flexibility by
allowing  the BIOS to request power state changes independently of specific
 events.

BUG=b:157943445
BRANCH=none
TEST=Build.Generated ASL code from SSDT by acipgen_dptci().check the setting changed.

Signed-off-by: Chris Wang <chris.wang@amd.corp-partner.google.com>
Change-Id: Icae94103f254f8fdb84e6ee0f5404fb09fa97b2d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43408
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Chris Wang 2020-07-13 23:29:29 +08:00 committed by Furquan Shaikh
parent 2ce386a3c2
commit 4735b1c01b
2 changed files with 97 additions and 0 deletions
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8
src/soc/amd/picasso/chip.h
View File

@ -90,6 +90,14 @@ struct soc_amd_picasso_config {
uint32_t stapm_time_constant;
uint32_t sustained_power_limit;
/* Enable dptc for tablet mode (0 = disable, 1 = enable) */
uint8_t dptc_enable;
/* STAPM Configuration for tablet mode (need enable dptc_enable first) */
uint32_t fast_ppt_limit_tablet_mode;
uint32_t slow_ppt_limit_tablet_mode;
uint32_t sustained_power_limit_tablet_mode;
/* PROCHOT_L de-assertion Ramp Time */
uint32_t prochot_l_deassertion_ramp_time;

89
src/soc/amd/picasso/root_complex.c
View File

@ -13,7 +13,44 @@
#include <stdint.h>
#include <soc/memmap.h>
#include <soc/iomap.h>
#include "chip.h"
enum {
ALIB_DPTCI_FUNCTION_ID = 0xc,
SUSTAINED_POWER_LIMIT_PARAM_ID = 0x5,
FAST_PPT_LIMIT_PARAM_ID = 0x6,
SLOW_PPT_LIMIT_PARAM_ID = 0x7,
DPTC_TOTAL_UPDATE_PARAMS = 3,
};
struct dptc_param {
uint8_t id;
uint32_t value;
} __packed;
struct dptc_input {
uint16_t size;
struct dptc_param params[DPTC_TOTAL_UPDATE_PARAMS];
} __packed;
#define DPTC_INPUTS(_sustained, _fast, _slow) \
{ \
.size = sizeof(struct dptc_input), \
.params = { \
{ \
.id = SUSTAINED_POWER_LIMIT_PARAM_ID, \
.value = _sustained, \
}, \
{ \
.id = FAST_PPT_LIMIT_PARAM_ID, \
.value = _fast, \
}, \
{ \
.id = SLOW_PPT_LIMIT_PARAM_ID, \
.value = _slow, \
}, \
}, \
}
/*
*
* +--------------------------------+
@ -139,6 +176,57 @@ static void read_resources(struct device *dev)
gnb_apic->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
}
static void dptc_call_alib(const char *buf_name, uint8_t *buffer, size_t size)
{
/* Name (buf_name, Buffer(size) {...} */
acpigen_write_name(buf_name);
acpigen_write_byte_buffer(buffer, size);
/* \_SB.ALIB(0xc, buf_name) */
acpigen_emit_namestring("\\_SB.ALIB");
acpigen_write_integer(ALIB_DPTCI_FUNCTION_ID);
acpigen_emit_namestring(buf_name);
}
static void acipgen_dptci(void)
{
const config_t *config = config_of_soc();
if (!config->dptc_enable)
return;
struct dptc_input default_input = DPTC_INPUTS(config->sustained_power_limit,
config->fast_ppt_limit,
config->slow_ppt_limit);
struct dptc_input tablet_mode_input = DPTC_INPUTS(
config->sustained_power_limit_tablet_mode,
config->fast_ppt_limit_tablet_mode,
config->slow_ppt_limit_tablet_mode);
/* Scope (\_SB) */
acpigen_write_scope("\\_SB");
/* Method(DPTC, 0, Serialized) */
acpigen_write_method_serialized("DPTC", 0);
/* If (LEqual ("\_SB.PCI0.LPCB.EC0.TBMD", 1)) */
acpigen_write_if_lequal_namestr_int("\\_SB.PCI0.LPCB.EC0.TBMD", 1);
dptc_call_alib("TABB", (uint8_t *)(void *)&tablet_mode_input,
sizeof(tablet_mode_input));
acpigen_pop_len(); /* If */
/* Else */
acpigen_write_else();
dptc_call_alib("DEFB", (uint8_t *)(void *)&default_input, sizeof(default_input));
acpigen_pop_len(); /* Else */
acpigen_pop_len(); /* Method DPTC */
acpigen_pop_len(); /* Scope \_SB */
}
/* Used by \_SB.PCI0._CRS */
static void root_complex_fill_ssdt(const struct device *device)
{
@ -164,6 +252,7 @@ static void root_complex_fill_ssdt(const struct device *device)
*/
acpigen_write_name_dword("TOM2", (msr.hi << 12) | msr.lo >> 20);
acpigen_pop_len();
acipgen_dptci();
}
static struct device_operations root_complex_operations = {