soc/mediatek/mt8186: Enable USB macro control

When powering down SSUSB, the system needs to wait the ACK from SSUSB.
We found that the setting of USB PAD top macro is not correct and
it will cause timeout waiting for the ACK from SSUSB.

To resolve this, we add mt_pll_set_usb_clock() in pll.c to enable usb
macro control for powering down SSUSB.

TEST=timeout of ssusb powerdown ack does not occur.
BUG=b:239634625

Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.corp-partner.google.com>
Change-Id: I58ba86e0467284e9947bfda1005c151a3e0c8881
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66600
Reviewed-by: Yidi Lin <yidilin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

4 files changed, 12 insertions, 2 deletions

diff --git a/src/soc/mediatek/mt8186/Makefile.inc b/src/soc/mediatek/mt8186/Makefile.inc
index 8b0e52a8e9..f214bbdaef 100644
--- a/src/soc/mediatek/mt8186/Makefile.inc
+++ b/src/soc/mediatek/mt8186/Makefile.inc
@@ -4,6 +4,7 @@ ifeq ($(CONFIG_SOC_MEDIATEK_MT8186),y)
 all-y += ../common/flash_controller.c
 all-y += ../common/gpio.c ../common/gpio_op.c  gpio.c
 all-y += ../common/i2c.c i2c.c
+all-y += ../common/pll.c pll.c
 all-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 all-y += ../common/timer.c ../common/timer_prepare.c
 all-y += ../common/uart.c
@@ -12,7 +13,6 @@ bootblock-y += bootblock.c
 bootblock-y += ../common/eint_event.c
 bootblock-y += gic.c
 bootblock-y += ../common/mmu_operations.c
-bootblock-y += ../common/pll.c pll.c
 bootblock-y += ../common/tracker.c ../common/tracker_v1.c
 bootblock-y += ../common/wdt.c ../common/wdt_req.c wdt.c
 
@@ -23,7 +23,6 @@ romstage-y += emi.c
 romstage-y += ../common/memory.c
 romstage-y += ../common/memory_test.c
 romstage-y += ../common/mmu_operations.c ../common/mmu_cmops.c
-romstage-y += ../common/pll.c pll.c
 romstage-y += ../common/pmic_wrap.c pmic_wrap.c pmif.c mt6366.c
 romstage-y += ../common/rtc.c ../common/rtc_osc_init.c rtc.c
 
diff --git a/src/soc/mediatek/mt8186/include/soc/pll.h b/src/soc/mediatek/mt8186/include/soc/pll.h
index c2dace3220..bcd00da23c 100644
--- a/src/soc/mediatek/mt8186/include/soc/pll.h
+++ b/src/soc/mediatek/mt8186/include/soc/pll.h
@@ -522,4 +522,6 @@ DEFINE_BITFIELD(INFRACFG_AO_PERI_BUS_REG0_0, 1, 0)
 DEFINE_BITFIELD(INFRACFG_AO_PERI_BUS_REG0_1, 27, 3)
 DEFINE_BIT(INFRACFG_AO_PERI_BUS_REG0_2, 31)
 
+DEFINE_BITFIELD(USB_TOP_CFG_MACRO_CTRL, 1, 0)
+
 #endif /* SOC_MEDIATEK_MT8186_PLL_H */
diff --git a/src/soc/mediatek/mt8186/pll.c b/src/soc/mediatek/mt8186/pll.c
index cd41d5e5f9..7179c2eac6 100644
--- a/src/soc/mediatek/mt8186/pll.c
+++ b/src/soc/mediatek/mt8186/pll.c
@@ -516,6 +516,12 @@ void mt_pll_raise_cci_freq(u32 freq)
 	clrsetbits32(&mtk_mcucfg->bus_plldiv_cfg, MCU_MUX_MASK, MCU_MUX_SRC_PLL);
 }
 
+void mt_pll_set_usb_clock(void)
+{
+	/* enable usb macro control */
+	SET32_BITFIELDS(&mtk_topckgen->usb_top_cfg, USB_TOP_CFG_MACRO_CTRL, 3);
+}
+
 u32 mt_fmeter_get_freq_khz(enum fmeter_type type, u32 id)
 {
 	u32 output, count, clk_dbg_cfg, clk_misc_cfg_0, clk26cali_0, clk26cali_1;
diff --git a/src/soc/mediatek/mt8186/usb.c b/src/soc/mediatek/mt8186/usb.c
index d13355527d..98d9c7c00e 100644
--- a/src/soc/mediatek/mt8186/usb.c
+++ b/src/soc/mediatek/mt8186/usb.c
@@ -8,6 +8,7 @@
 #include <device/mmio.h>
 #include <gpio.h>
 #include <soc/gpio.h>
+#include <soc/pll_common.h>
 #include <soc/usb.h>
 
 #define PERI_USB_WAKEUP_DEC_CON1	0x404
@@ -15,6 +16,8 @@
 
 void mtk_usb_prepare(void)
 {
+	mt_pll_set_usb_clock();
+
 	gpio_output(GPIO(USB_DRVVBUS_P1), 1);
 
 	/* disable IP0 debounce */