From a70288d9fc60416d828a724fd1f2e871bd9cc129 Mon Sep 17 00:00:00 2001 From: MAULIK V VAGHELA Date: Thu, 25 Nov 2021 14:41:19 +0530 Subject: drivers/intel/usb4/retimer: Add function to correct EC port mapping Currently coreboot interprets TCSS port number as per physical port number while EC abstracts port number and provides indices as port number. For example, if TCSS port 1 and 3 are enabled on the board, coreboot will interpret port numbers as 0 and 2, but since only 2 ports are enabled in the system EC will assign port numbers as 0 and 1. This creates a port number mismatch while communicating between EC and coreboot. This patch addresses issue where SoC can implement function to map correct EC port as per port enabled in mainboard. BUG=b:207057940 BRANCH=None TEST=Check if code compiles successfully. Functionality will work once function is implemented in SoC code. Change-Id: Ia7a5e63838e6529196bd211516e4d665b084f79e Signed-off-by: MAULIK V VAGHELA Reviewed-on: https://review.coreboot.org/c/coreboot/+/59665 Tested-by: build bot (Jenkins) Reviewed-by: Tim Wawrzynczak --- src/drivers/intel/usb4/retimer/retimer.c | 28 ++++++++++++++++++++++++++-- src/drivers/intel/usb4/retimer/retimer.h | 10 ++++++++++ 2 files changed, 36 insertions(+), 2 deletions(-) (limited to 'src/drivers/intel/usb4') diff --git a/src/drivers/intel/usb4/retimer/retimer.c b/src/drivers/intel/usb4/retimer/retimer.c index e54952598c..8a20ebe68a 100644 --- a/src/drivers/intel/usb4/retimer/retimer.c +++ b/src/drivers/intel/usb4/retimer/retimer.c @@ -341,6 +341,7 @@ static void usb4_retimer_fill_ssdt(const struct device *dev) static char dfp[DEVICE_PATH_MAX]; struct acpi_pld pld; uint8_t dfp_port, usb_port; + int ec_port = 0; usb4_retimer_scope = acpi_device_scope(dev); if (!usb4_retimer_scope || !config) @@ -365,8 +366,14 @@ static void usb4_retimer_fill_ssdt(const struct device *dev) usb_device = config->dfp[dfp_port].typec_port; usb_port = usb_device->path.usb.port_id; + ec_port = retimer_get_index_for_typec(usb_port); + if (ec_port == -1) { + printk(BIOS_ERR, "%s: No relative EC port found for TC port %d\n", + __func__, usb_port); + continue; + } /* DFPx */ - snprintf(dfp, sizeof(dfp), "DFP%1d", usb_port); + snprintf(dfp, sizeof(dfp), "DFP%1d", ec_port); acpigen_write_device(dfp); /* _ADR part is for the lane adapter */ acpigen_write_ADR(dfp_port*2 + 1); @@ -396,7 +403,7 @@ static void usb4_retimer_fill_ssdt(const struct device *dev) /* Return (Buffer (One) { 0x0 }) */ acpigen_write_return_singleton_buffer(0x0); acpigen_pop_len(); - usb4_retimer_write_dsm(usb_port, INTEL_USB4_RETIMER_DSM_UUID, + usb4_retimer_write_dsm(ec_port, INTEL_USB4_RETIMER_DSM_UUID, usb4_retimer_callbacks, ARRAY_SIZE(usb4_retimer_callbacks), (void *)&config->dfp[dfp_port].power_gpio); /* Default case: Return (Buffer (One) { 0x0 }) */ @@ -436,3 +443,20 @@ __weak const char *ec_retimer_fw_update_path(void) __weak void ec_retimer_fw_update(uint8_t data) { } + +/* + * This function will convert CPU physical port mapping to abstract + * EC port mapping. + * For example, board might have enabled TCSS port 1 and 3 as per physical + * port mapping. Since only 2 TCSS ports are enabled EC will index it as port 0 + * and port 1. So there will be an issue when coreboot sends command to EC for + * port 3 (with coreboot index of 2). EC will produce an error due to wrong index. + * + * Note: Each SoC code using retimer driver needs to implement this function + * since SoC will have physical port details. + */ +__weak int retimer_get_index_for_typec(uint8_t typec_port) +{ + /* By default assume that retimer port index = Type C port */ + return (int)typec_port; +} diff --git a/src/drivers/intel/usb4/retimer/retimer.h b/src/drivers/intel/usb4/retimer/retimer.h index 5a040a0d47..ff87c19618 100644 --- a/src/drivers/intel/usb4/retimer/retimer.h +++ b/src/drivers/intel/usb4/retimer/retimer.h @@ -30,5 +30,15 @@ struct usb4_retimer_dsm_uuid { const char *ec_retimer_fw_update_path(void); void ec_retimer_fw_update(uint8_t data); +/* + * This function will convert CPU physical port mapping to abstract + * EC port mapping. For example, board might have enabled TCSS port 1 + * and 3 as per physical port mapping. Since only 2 TCSS ports are enabled + * EC will name it as port 0 and port 1. So there will be mismatch when + * coreboot sends index for port 3. + * Each SoC code using retimer driver needs to implement this function + * since SoC will have physical port details. + */ +int retimer_get_index_for_typec(uint8_t typec_port); #endif /* _DRIVERS_INTEL_USB4_RETIMER_H_ */ -- cgit v1.2.3