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Add calls to tight_loop_contents in a few more places. (#1401)

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Fixes #1290
This commit is contained in:
Andrew Scheller 2023-12-15 13:36:51 +00:00 • committed by GitHub
parent d92e26afca
commit 7ed83dd2d3
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 12 additions and 4 deletions
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4
src/rp2_common/hardware_sync/include/hardware/sync.h
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@ -262,7 +262,9 @@ __force_inline static void spin_lock_unsafe_blocking(spin_lock_t *lock) {
// Note we don't do a wfe or anything, because by convention these spin_locks are VERY SHORT LIVED and NEVER BLOCK and run
// with INTERRUPTS disabled (to ensure that)... therefore nothing on our core could be blocking us, so we just need to wait on another core
// anyway which should be finished soon
while (__builtin_expect(!*lock, 0));
while (__builtin_expect(!*lock, 0)) {
tight_loop_contents();
}
__mem_fence_acquire();
}

12
src/rp2_common/hardware_xosc/xosc.c
View file

@ -37,7 +37,9 @@ void xosc_init(void) {
hw_set_bits(&xosc_hw->ctrl, XOSC_CTRL_ENABLE_VALUE_ENABLE << XOSC_CTRL_ENABLE_LSB);
// Wait for XOSC to be stable
while(!(xosc_hw->status & XOSC_STATUS_STABLE_BITS));
while(!(xosc_hw->status & XOSC_STATUS_STABLE_BITS)) {
tight_loop_contents();
}
}
void xosc_disable(void) {
@ -46,12 +48,16 @@ void xosc_disable(void) {
tmp |= (XOSC_CTRL_ENABLE_VALUE_DISABLE << XOSC_CTRL_ENABLE_LSB);
xosc_hw->ctrl = tmp;
// Wait for stable to go away
while(xosc_hw->status & XOSC_STATUS_STABLE_BITS);
while(xosc_hw->status & XOSC_STATUS_STABLE_BITS) {
tight_loop_contents();
}
}
void xosc_dormant(void) {
// WARNING: This stops the xosc until woken up by an irq
xosc_hw->dormant = XOSC_DORMANT_VALUE_DORMANT;
// Wait for it to become stable once woken up
while(!(xosc_hw->status & XOSC_STATUS_STABLE_BITS));
while(!(xosc_hw->status & XOSC_STATUS_STABLE_BITS)) {
tight_loop_contents();
}
}