diff options
Diffstat (limited to 'common/usbc/dp_alt_mode.c')
| -rw-r--r-- | common/usbc/dp_alt_mode.c | 292 |
1 files changed, 0 insertions, 292 deletions
diff --git a/common/usbc/dp_alt_mode.c b/common/usbc/dp_alt_mode.c deleted file mode 100644 index 9a3493c6e1..0000000000 --- a/common/usbc/dp_alt_mode.c +++ /dev/null @@ -1,292 +0,0 @@ -/* Copyright 2020 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -/* - * DisplayPort alternate mode support - * Refer to VESA DisplayPort Alt Mode on USB Type-C Standard, version 2.0, - * section 5.2 - */ - -#include <stdbool.h> -#include <stdint.h> -#include "assert.h" -#include "usb_common.h" -#include "usb_dp_alt_mode.h" -#include "usb_pd.h" -#include "usb_pd_tcpm.h" - -#ifdef CONFIG_COMMON_RUNTIME -#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args) -#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args) -#else -#define CPRINTF(format, args...) -#define CPRINTS(format, args...) -#endif - -/* The state of the DP negotiation */ -enum dp_states { - DP_START = 0, - DP_ENTER_ACKED, - DP_ENTER_NAKED, - DP_STATUS_ACKED, - DP_ACTIVE, - DP_ENTER_RETRY, - DP_INACTIVE, - DP_STATE_COUNT -}; -static enum dp_states dp_state[CONFIG_USB_PD_PORT_MAX_COUNT]; - -/* - * Map of states to expected VDM commands in responses. - * Default of 0 indicates no command expected. - */ -static const uint8_t state_vdm_cmd[DP_STATE_COUNT] = { - [DP_START] = CMD_ENTER_MODE, - [DP_ENTER_ACKED] = CMD_DP_STATUS, - [DP_STATUS_ACKED] = CMD_DP_CONFIG, - [DP_ACTIVE] = CMD_EXIT_MODE, - [DP_ENTER_NAKED] = CMD_EXIT_MODE, - [DP_ENTER_RETRY] = CMD_ENTER_MODE, -}; - -bool dp_is_active(int port) -{ - return dp_state[port] == DP_ACTIVE; -} - -void dp_init(int port) -{ - dp_state[port] = DP_START; -} - -bool dp_entry_is_done(int port) -{ - return dp_state[port] == DP_ACTIVE || - dp_state[port] == DP_INACTIVE; -} - -static void dp_entry_failed(int port) -{ - CPRINTS("C%d: DP alt mode protocol failed!", port); - dp_state[port] = DP_INACTIVE; -} - -static bool dp_response_valid(int port, enum tcpci_msg_type type, - char *cmdt, int vdm_cmd) -{ - enum dp_states st = dp_state[port]; - - /* - * Check for an unexpected response. - * If DP is inactive, ignore the command. - */ - if (type != TCPCI_MSG_SOP || - (st != DP_INACTIVE && state_vdm_cmd[st] != vdm_cmd)) { - CPRINTS("C%d: Received unexpected DP VDM %s (cmd %d) from" - " %s in state %d", port, cmdt, vdm_cmd, - type == TCPCI_MSG_SOP ? "port partner" : "cable plug", - st); - dp_entry_failed(port); - return false; - } - return true; -} - -static void dp_exit_to_usb_mode(int port) -{ - int opos = pd_alt_mode(port, TCPCI_MSG_SOP, USB_SID_DISPLAYPORT); - - pd_dfp_exit_mode(port, TCPCI_MSG_SOP, USB_SID_DISPLAYPORT, opos); - set_usb_mux_with_current_data_role(port); - - CPRINTS("C%d: Exited DP mode", port); - /* - * If the EC exits an alt mode autonomously, don't try to enter it again. If - * the AP commands the EC to exit DP mode, it might command the EC to enter - * again later, so leave the state machine ready for that possibility. - */ - dp_state[port] = IS_ENABLED(CONFIG_USB_PD_REQUIRE_AP_MODE_ENTRY) - ? DP_START : DP_INACTIVE; -} - -void dp_vdm_acked(int port, enum tcpci_msg_type type, int vdo_count, - uint32_t *vdm) -{ - const struct svdm_amode_data *modep = - pd_get_amode_data(port, type, USB_SID_DISPLAYPORT); - const uint8_t vdm_cmd = PD_VDO_CMD(vdm[0]); - - if (!dp_response_valid(port, type, "ACK", vdm_cmd)) - return; - - /* TODO(b/155890173): Validate VDO count for specific commands */ - - switch (dp_state[port]) { - case DP_START: - case DP_ENTER_RETRY: - dp_state[port] = DP_ENTER_ACKED; - /* Inform PE layer that alt mode is now active */ - pd_set_dfp_enter_mode_flag(port, true); - break; - case DP_ENTER_ACKED: - /* DP status response & UFP's DP attention have same payload. */ - dfp_consume_attention(port, vdm); - dp_state[port] = DP_STATUS_ACKED; - break; - case DP_STATUS_ACKED: - if (modep && modep->opos && modep->fx->post_config) - modep->fx->post_config(port); - dp_state[port] = DP_ACTIVE; - CPRINTS("C%d: Entered DP mode", port); - break; - case DP_ACTIVE: - /* - * Request to exit mode successful, so put the module in an - * inactive state. - */ - dp_exit_to_usb_mode(port); - break; - case DP_ENTER_NAKED: - /* - * The request to exit the mode was successful, - * so try to enter the mode again. - */ - dp_state[port] = DP_ENTER_RETRY; - break; - case DP_INACTIVE: - /* - * This can occur if the mode is shutdown because - * the CPU is being turned off, and an exit mode - * command has been sent. - */ - break; - default: - /* Invalid or unexpected negotiation state */ - CPRINTF("%s called with invalid state %d\n", - __func__, dp_state[port]); - dp_entry_failed(port); - break; - } -} - -void dp_vdm_naked(int port, enum tcpci_msg_type type, uint8_t vdm_cmd) -{ - if (!dp_response_valid(port, type, "NAK", vdm_cmd)) - return; - - switch (dp_state[port]) { - case DP_START: - /* - * If a request to enter DP mode is NAK'ed, this likely - * means the partner is already in DP alt mode, so - * request to exit the mode first before retrying - * the enter command. This can happen if the EC - * is restarted (e.g to go into recovery mode) while - * DP alt mode is active. - */ - dp_state[port] = DP_ENTER_NAKED; - break; - case DP_ENTER_RETRY: - /* - * Another NAK on the second attempt to enter DP mode. - * Give up. - */ - dp_entry_failed(port); - break; - case DP_ACTIVE: - /* Treat an Exit Mode NAK the same as an Exit Mode ACK. */ - dp_exit_to_usb_mode(port); - break; - default: - CPRINTS("C%d: NAK for cmd %d in state %d", port, - vdm_cmd, dp_state[port]); - dp_entry_failed(port); - break; - } -} - -int dp_setup_next_vdm(int port, int vdo_count, uint32_t *vdm) -{ - const struct svdm_amode_data *modep = pd_get_amode_data(port, - TCPCI_MSG_SOP, USB_SID_DISPLAYPORT); - int vdo_count_ret; - - if (vdo_count < VDO_MAX_SIZE) - return -1; - - switch (dp_state[port]) { - case DP_START: - case DP_ENTER_RETRY: - /* Enter the first supported mode for DisplayPort. */ - vdm[0] = pd_dfp_enter_mode(port, TCPCI_MSG_SOP, - USB_SID_DISPLAYPORT, 0); - if (vdm[0] == 0) - return -1; - /* CMDT_INIT is 0, so this is a no-op */ - vdm[0] |= VDO_CMDT(CMDT_INIT); - vdm[0] |= VDO_SVDM_VERS(pd_get_vdo_ver(port, TCPCI_MSG_SOP)); - vdo_count_ret = 1; - if (dp_state[port] == DP_START) - CPRINTS("C%d: Attempting to enter DP mode", port); - break; - case DP_ENTER_ACKED: - if (!(modep && modep->opos)) - return -1; - - vdo_count_ret = modep->fx->status(port, vdm); - if (vdo_count_ret == 0) - return -1; - vdm[0] |= PD_VDO_OPOS(modep->opos); - vdm[0] |= VDO_CMDT(CMDT_INIT); - vdm[0] |= VDO_SVDM_VERS(pd_get_vdo_ver(port, TCPCI_MSG_SOP)); - break; - case DP_STATUS_ACKED: - if (!(modep && modep->opos)) - return -1; - - vdo_count_ret = modep->fx->config(port, vdm); - if (vdo_count_ret == 0) - return -1; - vdm[0] |= VDO_CMDT(CMDT_INIT); - vdm[0] |= VDO_SVDM_VERS(pd_get_vdo_ver(port, TCPCI_MSG_SOP)); - break; - case DP_ENTER_NAKED: - case DP_ACTIVE: - /* - * Called to exit DP alt mode, either when the mode - * is active and the system is shutting down, or - * when an initial request to enter the mode is NAK'ed. - * This can happen if the EC is restarted (e.g to go - * into recovery mode) while DP alt mode is active. - * It would be good to invoke modep->fx->exit but - * this doesn't set up the VDM, it clears state. - * TODO(b/159856063): Clean up the API to the fx functions. - */ - if (!(modep && modep->opos)) - return -1; - - usb_mux_set_safe_mode_exit(port); - - vdm[0] = VDO(USB_SID_DISPLAYPORT, - 1, /* structured */ - CMD_EXIT_MODE); - - vdm[0] |= VDO_OPOS(modep->opos); - vdm[0] |= VDO_CMDT(CMDT_INIT); - vdm[0] |= VDO_SVDM_VERS(pd_get_vdo_ver(port, TCPCI_MSG_SOP)); - vdo_count_ret = 1; - break; - case DP_INACTIVE: - /* - * DP mode is inactive. - */ - return -1; - default: - CPRINTF("%s called with invalid state %d\n", - __func__, dp_state[port]); - return -1; - } - return vdo_count_ret; -} |