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[WIP] ec/system76/ec: Implement USB-C DP HPD

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Change-Id: I0487b761a5a83b0a1897c92416d0d81219303341
Signed-off-by: Tim Crawford <tcrawford@system76.com>
This commit is contained in:
Tim Crawford 2023-12-14 12:49:02 -07:00
parent 3a205fc0bf
commit f615ba1c4e
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GPG Key ID: 68E558D2BBD856E3
1 changed files with 39 additions and 6 deletions
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41
src/ec/system76/ec/usbc_mux.c
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@ -4,6 +4,7 @@
#include <console/console.h>
#include <delay.h>
#include <device/usbc_mux.h>
#include <timer.h>
#include <types.h>
#define CMD_USBC_MUX_INFO 23
@ -60,25 +61,57 @@ static int system76_ec_get_mux_info(int port, struct usbc_mux_info *info)
static int system76_ec_wait_for_connection(long timeout_ms)
{
// TODO
return 0;
return 1;
}
static int system76_ec_enter_dp_mode(int port)
{
// TODO
return -1;
return 0;
}
static int system76_ec_wait_for_dp_mode_entry(int port, long timeout_ms)
{
// TODO
struct usbc_mux_info info;
if (system76_ec_get_mux_info(port, &info) < 0) {
printk(BIOS_WARNING, "%s: could not get usbc mux info\n", __func__);
return -1;
}
if (!info.dp) {
printk(BIOS_WARNING, "DP mode not ready\n");
return -1;
}
return 0;
}
static int system76_ec_wait_for_hpd(int port, long timeout_ms)
{
// TODO
struct usbc_mux_info info;
struct stopwatch sw;
stopwatch_init_msecs_expire(&sw, timeout_ms);
while (1) {
if (system76_ec_get_mux_info(port, &info) < 0) {
printk(BIOS_WARNING, "%s: could not get usbc mux info\n", __func__);
return -1;
}
if (info.hpd_lvl)
break;
if (stopwatch_expired(&sw)) {
printk(BIOS_WARNING, "HPD not ready after %ldms\n", timeout_ms);
return -1;
}
mdelay(100);
}
printk(BIOS_INFO, "HPD ready after %lldms\n", stopwatch_duration_msecs(&sw));
return 0;
}
static const struct usbc_ops system76_ec_usbc_ops = {