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a9c79eede9
When the EC does a sysjump it redoes the PD negotiation. This changes the voltage levels on the CC lines. Debounce the rdd disconnect signal for 2 seconds so cr50 will ignore the negotiation and keep CCD enabled. BUG=chrome-os-partner:60924 BRANCH=none TEST=connect suzyq. Make sure usb does not drop out during a EC sysjump or reboot. Change-Id: I95b9bc81f736e3b7a65103817c140874b1ed34ec Signed-off-by: Mary Ruthven <mruthven@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/426398 Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
/* Copyright 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "clock.h"
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#include "console.h"
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#include "hooks.h"
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#include "rdd.h"
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#include "registers.h"
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#include "system.h"
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#include "task.h"
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#include "timer.h"
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#include "usb_api.h"
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#define CPRINTS(format, args...) cprints(CC_USB, format, ## args)
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/*
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* The default PROG_DEBUG_STATE_MAP value. Used to tell the to controller send
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* an interrupt when CC1/2 are detected to be in the defined voltage range of a
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* debug accessory.
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*/
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#define DETECT_DEBUG 0x420
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#define DETECT_DISCONNECT (~DETECT_DEBUG & 0xffff)
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int debug_cable_is_attached(void)
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{
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uint8_t cc1 = GREAD_FIELD(RDD, INPUT_PIN_VALUES, CC1);
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uint8_t cc2 = GREAD_FIELD(RDD, INPUT_PIN_VALUES, CC2);
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return (cc1 == cc2 && (cc1 == 3 || cc1 == 1));
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}
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static void rdd_disconnected(void)
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{
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CPRINTS("Debug Accessory disconnected");
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rdd_detached();
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}
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DECLARE_DEFERRED(rdd_disconnected);
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void rdd_interrupt(void)
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{
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delay_sleep_by(1 * SECOND);
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if (debug_cable_is_attached()) {
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/* cancel pending rdd disconnect */
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hook_call_deferred(&rdd_disconnected_data, -1);
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CPRINTS("Debug Accessory connected");
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/* Detect when debug cable is disconnected */
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GWRITE(RDD, PROG_DEBUG_STATE_MAP, DETECT_DISCONNECT);
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rdd_attached();
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} else {
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/* Detect when debug cable is connected */
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GWRITE(RDD, PROG_DEBUG_STATE_MAP, DETECT_DEBUG);
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/*
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* Debounce the RDD disconnect for 2 seconds so rdd events
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* won't be triggered by any PD negotiation the EC does during
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* reset or sysjump.
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*/
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hook_call_deferred(&rdd_disconnected_data, 2 * SECOND);
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}
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/* Clear interrupt */
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GWRITE_FIELD(RDD, INT_STATE, INTR_DEBUG_STATE_DETECTED, 1);
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}
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DECLARE_IRQ(GC_IRQNUM_RDD0_INTR_DEBUG_STATE_DETECTED_INT, rdd_interrupt, 1);
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void rdd_init(void)
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{
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/* Enable RDD */
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clock_enable_module(MODULE_RDD, 1);
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GWRITE(RDD, POWER_DOWN_B, 1);
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GWRITE(RDD, PROG_DEBUG_STATE_MAP, DETECT_DEBUG);
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/* Initialize the debug state based on the current cc values */
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rdd_interrupt();
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/* Enable RDD interrupts */
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task_enable_irq(GC_IRQNUM_RDD0_INTR_DEBUG_STATE_DETECTED_INT);
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GWRITE_FIELD(RDD, INT_ENABLE, INTR_DEBUG_STATE_DETECTED, 1);
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}
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DECLARE_HOOK(HOOK_INIT, rdd_init, HOOK_PRIO_DEFAULT);
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