erebion/coreboot
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

mb/google/bluey: Implement PS8820 retimer configuration

Browse source 
Implement mainboard_usb_typec_configure to program the Parade PS8820
retimers over I2C. The function sets the USB3 mode registers for
either normal or flipped orientation based on the polarity reported
by the SoC.

Additionally, update mainboard_init to perform standard I2C
initialization for the retimer buses when this feature is enabled,
ensuring the buses are ready for transactions during the USB
sequencing.

BUG=b:473489095
TEST=Verify USB SS detection on Quartz.

Sample output:
```
firmware-shell: md 0x0a800420 8
0a800420: 000002a0 00000000 00000000 00000000    ................
0a800430: 00001203 00000000 00000000 00000000    ................
firmware-shell: md 0x0a600420 8
0a600420: 000002a0 00000000 00000000 00000000    ................
0a600430: 00001203 00000000 00000000 00000000    ................
```

Change-Id: I14f86945aeea9b83a9433edd53f5023231ca859d
Signed-off-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90707
Reviewed-by: Jayvik Desai <jayvik@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Pranava Y N <pranavayn@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Kapil Porwal 2026-01-09 13:27:03 +05:30 • committed by Subrata Banik
commit f9efe53cb0
1 changed files with 33 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

37
src/mainboard/google/bluey/mainboard.c
View file

@ -8,16 +8,42 @@
#include <console/console.h>
#include <delay.h>
#include <device/device.h>
#include <device/i2c_simple.h>
#include <ec/google/chromeec/ec.h>
#include <gpio.h>
#include <soc/clock.h>
#include <soc/pcie.h>
#include <soc/qupv3_config_common.h>
#include <soc/qupv3_i2c_common.h>
#include <soc/qup_se_handlers_common.h>
#include "board.h"
#include <soc/rpmh_config.h>
#include <soc/usb/usb.h>
#define C0_RETIMER_I2C_BUS 0x03
#define C1_RETIMER_I2C_BUS 0x07
#define PS8820_SLAVE_ADDR 0x08
#define PS8820_USB_PORT_CONN_STATUS_REG 0x00
#define USB3_MODE_NORMAL_VAL 0x21
#define USB3_MODE_FLIP_VAL 0x23
void mainboard_usb_typec_configure(uint8_t port_num, bool inverse_polarity)
{
if (!CONFIG(MAINBOARD_HAS_PS8820_RETIMER))
return;
/* There are only two ports (0 and 1) */
if (port_num > 1) {
printk(BIOS_WARNING, "Invalid USB Type-C port number (%d)!\n", port_num);
return;
}
uint8_t bus = port_num ? C1_RETIMER_I2C_BUS : C0_RETIMER_I2C_BUS;
uint8_t mode_value = inverse_polarity ? USB3_MODE_FLIP_VAL : USB3_MODE_NORMAL_VAL;
i2c_writeb(bus, PS8820_SLAVE_ADDR, PS8820_USB_PORT_CONN_STATUS_REG, mode_value);
}
/*
* This function calls the underlying PMIC/EC function only once during the
* first execution and caches the result for all subsequent calls.
@ -136,11 +162,14 @@ static void mainboard_init(struct device *dev)
/* ADSP I2C (Charger/Fuel gauge) */
qupv3_se_fw_load_and_init(QUPV3_2_SE4, SE_PROTOCOL_I2C, GSI);
/* USB-C0 Re-Timer I2C */
qupv3_se_fw_load_and_init(QUPV3_0_SE3, SE_PROTOCOL_I2C, MIXED);
/* USB-C1 Re-Timer I2C */
qupv3_se_fw_load_and_init(QUPV3_0_SE7, SE_PROTOCOL_I2C, MIXED);
if (CONFIG(MAINBOARD_HAS_PS8820_RETIMER)) {
i2c_init(QUPV3_0_SE3, I2C_SPEED_FAST); /* USB-C0 Re-Timer I2C */
i2c_init(QUPV3_0_SE7, I2C_SPEED_FAST); /* USB-C1 Re-Timer I2C */
} else {
qupv3_se_fw_load_and_init(QUPV3_0_SE3, SE_PROTOCOL_I2C, MIXED); /* USB-C0 Re-Timer I2C */
qupv3_se_fw_load_and_init(QUPV3_0_SE7, SE_PROTOCOL_I2C, MIXED); /* USB-C1 Re-Timer I2C */
}
if (!CONFIG(MAINBOARD_NO_USB_A_PORT))
qupv3_se_fw_load_and_init(QUPV3_0_SE1, SE_PROTOCOL_I2C, MIXED); /* USB-A retimer */