soc/mediatek/mt8195: add HDMI low power setting

Add HDMI low power setting to reduce power consumption.

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: Ica91645789e5de3401131e7050d2b1ee06c535dd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57042
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/mediatek/mt8195/Makefile.inc

@@ -58,6 +58,7 @@ ramstage-y += dp_intf.c dptx.c dptx_hal.c
 ramstage-y += emi.c
 ramstage-y += ../common/flash_controller.c
 ramstage-y += ../common/gpio.c gpio.c
+ramstage-y += hdmi.c
 ramstage-y += ../common/i2c.c i2c.c
 ramstage-y += ../common/mcu.c
 ramstage-y += ../common/mcupm.c

src/soc/mediatek/mt8195/hdmi.c

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/mmio.h>
+#include <soc/hdmi.h>
+
+void hdmi_low_power_setting(void)
+{
+	printk(BIOS_INFO, "%s: Enable HDMI low power setting\n", __func__);
+
+	setbits32((void *)HDMI_PROTECT_REG, BIT(0) | BIT(1));
+
+	/* HDMI-RX powerdown */
+	write32((void *)HDMI_RX_PDN_0_REG, HDMI_RX_PDN_0_VAL);
+	write32((void *)HDMI_RX_PDN_1_REG, HDMI_RX_PDN_1_VAL);
+	write32((void *)HDMI_RX_PDN_2_REG, HDMI_RX_PDN_2_VAL);
+	write32((void *)HDMI_RX_PDN_3_REG, HDMI_RX_PDN_3_VAL);
+	write32((void *)HDMI_RX_PDN_4_REG, HDMI_RX_PDN_4_VAL);
+	write32((void *)HDMI_RX_PDN_5_REG, HDMI_RX_PDN_5_VAL);
+	write32((void *)HDMI_RX_PDN_6_REG, HDMI_RX_PDN_6_VAL);
+	write32((void *)HDMI_RX_PDN_7_REG, HDMI_RX_PDN_7_VAL);
+
+	/* HDMI-TX powerdown */
+	write32((void *)HDMI_TX_PDN_REG, HDMI_TX_PDN_VAL);
+}

src/soc/mediatek/mt8195/include/soc/hdmi.h

@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOC_MEDIATEK_MT8195_HDMI_H
+#define SOC_MEDIATEK_MT8195_HDMI_H
+
+#define HDMI_TX_BASE_REG	0x11D5F000
+#define HDMI_RX_BASE_REG	0x11D60000
+
+#define HDMI_PROTECT_REG	(HDMI_TX_BASE_REG + 0xD0)
+
+#define HDMI_RX_PDN_0_REG	(HDMI_RX_BASE_REG + 0x464)
+#define HDMI_RX_PDN_1_REG	(HDMI_RX_BASE_REG + 0x564)
+#define HDMI_RX_PDN_2_REG	(HDMI_RX_BASE_REG + 0x468)
+#define HDMI_RX_PDN_3_REG	(HDMI_RX_BASE_REG + 0x568)
+#define HDMI_RX_PDN_4_REG	(HDMI_RX_BASE_REG + 0x46c)
+#define HDMI_RX_PDN_5_REG	(HDMI_RX_BASE_REG + 0x56c)
+#define HDMI_RX_PDN_6_REG	(HDMI_RX_BASE_REG + 0x2000)
+#define HDMI_RX_PDN_7_REG	(HDMI_RX_BASE_REG + 0x2080)
+#define HDMI_TX_PDN_REG		(HDMI_TX_BASE_REG + 0x40)
+
+#define HDMI_RX_PDN_0_VAL	0xFFFFFC00
+#define HDMI_RX_PDN_1_VAL	0xFFFFFC00
+#define HDMI_RX_PDN_2_VAL	0xFFFFFFFF
+#define HDMI_RX_PDN_3_VAL	0xFFFFFFFF
+#define HDMI_RX_PDN_4_VAL	0xFFFF000F
+#define HDMI_RX_PDN_5_VAL	0xFFFF000F
+#define HDMI_RX_PDN_6_VAL	0xFFFF0006
+#define HDMI_RX_PDN_7_VAL	0xFFFF0007
+#define HDMI_TX_PDN_VAL		0x0012C561
+
+void hdmi_low_power_setting(void);
+
+#endif

src/soc/mediatek/mt8195/soc.c

@@ -3,6 +3,7 @@
 #include <device/device.h>
 #include <soc/devapc.h>
 #include <soc/emi.h>
+#include <soc/hdmi.h>
 #include <soc/mcupm.h>
 #include <soc/mmu_operations.h>
 #include <soc/sspm.h>
@@ -21,6 +22,7 @@ static void soc_init(struct device *dev)
 	mcupm_init();
 	sspm_init();
 	ufs_disable_refclk();
+	hdmi_low_power_setting();
 }
 
 static struct device_operations soc_ops = {