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mb/google/dedede: Configure VCCIOSEL for EN_SPKR GPIO Pad 

Realtek speaker amplifiers under auto mode operation have Absolute Max
Rating (AMR) at 1.98 V. Hence probe the firmware config for speaker
amplifier and program the VCCIOSEL accordingly.

BUG=b:194120188
TEST=Build and boot to OS in Storo. Ensure that the VCCIO selection is
configured as expected and probing the GPIO reads the configured
voltage.

Change-Id: Ibd3bc90bd0bbc9a35922b29e3d1e106321bc7a06
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56616
Reviewed-by: Evan Green <evgreen@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Karthikeyan Ramasubramanian 2021-07-26 16:01:57 -06:00 committed by Patrick Georgi
parent 0b39a5a23a
commit ba9b476d1b
2 changed files with 24 additions and 0 deletions
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1
src/mainboard/google/dedede/Makefile.inc
View File

@ -9,6 +9,7 @@ ramstage-$(CONFIG_CHROMEOS) += chromeos.c
ramstage-y += mainboard.c ramstage-y += mainboard.c
ramstage-y += ec.c ramstage-y += ec.c
ramstage-y += board_info.c ramstage-y += board_info.c
ramstage-y += fw_config.c
VARIANT_DIR:=$(call strip_quotes,$(CONFIG_VARIANT_DIR)) VARIANT_DIR:=$(call strip_quotes,$(CONFIG_VARIANT_DIR))

23
src/mainboard/google/dedede/fw_config.c Normal file
View File

@ -0,0 +1,23 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/mmio.h>
#include <bootstate.h>
#include <console/console.h>
#include <fw_config.h>
#include <gpio.h>
#include <intelblocks/gpio.h>
#define PAD_CFG_DW2_OFFSET (2 * sizeof(uint32_t))
#define VCCIOSEL_1V8 (1 << 8)
static void fw_config_handle(void *unused)
{
void *pad_conf_offset = gpio_dwx_address(GPP_D17) + PAD_CFG_DW2_OFFSET;
uint32_t pad_conf = read32(pad_conf_offset);
if (fw_config_probe(FW_CONFIG(AUDIO_AMP, RT1015P_AUTO))) {
pad_conf |= VCCIOSEL_1V8;
write32(pad_conf_offset, pad_conf);
}
}
BOOT_STATE_INIT_ENTRY(BS_DEV_ENABLE, BS_ON_ENTRY, fw_config_handle, NULL);