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Add compiler fence before mbox write

This commit is contained in:
Berkus Decker 2019-02-24 00:03:52 +02:00
parent 1e8735c1f6
commit db5948075e
1 changed files with 6 additions and 0 deletions
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6
src/platform/mailbox.rs
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@ -4,6 +4,7 @@ use crate::{
println, println,
}; };
use core::ops::Deref; use core::ops::Deref;
use core::sync::atomic::{compiler_fence, Ordering};
use register::mmio::*; use register::mmio::*;
// Public interface to the mailbox // Public interface to the mailbox
@ -194,6 +195,11 @@ fn write(regs: &RegisterBlock, buf_ptr: u32, channel: u32) -> Result<()> {
println!("Mailbox::write {:x}/{:x}", buf_ptr, channel); println!("Mailbox::write {:x}/{:x}", buf_ptr, channel);
// Insert a compiler fence that ensures that all stores to the
// mbox buffer are finished before the GPU is signaled (which is
// done by a store operation as well).
compiler_fence(Ordering::Release);
while regs.STATUS.is_set(STATUS::FULL) { while regs.STATUS.is_set(STATUS::FULL) {
count += 1; count += 1;
if count > (1 << 25) { if count > (1 << 25) {