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https://github.com/AsahiLinux/u-boot
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b53f6992e9
The DM version of do_reset has been issuing a warm-reset, which (on some platforms keeps GPIOs and other parts of the platform active). This may cause unintended behaviour, as calling do_reset usually indicates a desire to reset the board/platform and not just the CPU. This changes do_reset to always request a COLD reset. Note that programmatic uses can still invoke a WARM reset through reset_cpu() or using sysreset_walk(). Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Reviewed-by: Simon Glass <sjg@chromium.org>
81 lines
1.4 KiB
C
81 lines
1.4 KiB
C
/*
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* Copyright (C) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <sysreset.h>
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#include <dm.h>
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#include <errno.h>
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#include <regmap.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/root.h>
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#include <linux/err.h>
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int sysreset_request(struct udevice *dev, enum sysreset_t type)
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{
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struct sysreset_ops *ops = sysreset_get_ops(dev);
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if (!ops->request)
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return -ENOSYS;
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return ops->request(dev, type);
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}
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int sysreset_walk(enum sysreset_t type)
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{
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struct udevice *dev;
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int ret = -ENOSYS;
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while (ret != -EINPROGRESS && type < SYSRESET_COUNT) {
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for (uclass_first_device(UCLASS_SYSRESET, &dev);
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dev;
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uclass_next_device(&dev)) {
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ret = sysreset_request(dev, type);
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if (ret == -EINPROGRESS)
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break;
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}
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type++;
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}
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return ret;
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}
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void sysreset_walk_halt(enum sysreset_t type)
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{
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int ret;
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ret = sysreset_walk(type);
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/* Wait for the reset to take effect */
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if (ret == -EINPROGRESS)
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mdelay(100);
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/* Still no reset? Give up */
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debug("System reset not supported on this platform\n");
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hang();
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}
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/**
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* reset_cpu() - calls sysreset_walk(SYSRESET_WARM)
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*/
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void reset_cpu(ulong addr)
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{
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sysreset_walk_halt(SYSRESET_WARM);
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}
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int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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sysreset_walk_halt(SYSRESET_COLD);
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return 0;
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}
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UCLASS_DRIVER(sysreset) = {
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.id = UCLASS_SYSRESET,
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.name = "sysreset",
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};
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