From: John Hubbard <jhubbard@nvidia.com>

Otherwise, you'll never reach Riscv==true, much less GSP's INIT_DONE
message.

This is how Nouveau does it.

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 drivers/gpu/nova-core/falcon.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
index 7fbf909cae08..05bde1f161ea 100644
--- a/drivers/gpu/nova-core/falcon.rs
+++ b/drivers/gpu/nova-core/falcon.rs
@@ -385,7 +385,11 @@ pub(crate) fn dma_reset(&self, bar: &Bar0) {
 
     /// Wait for memory scrubbing to complete.
     fn reset_wait_mem_scrubbing(&self, bar: &Bar0) -> Result {
-        // TIMEOUT: memory scrubbing should complete in less than 20ms.
+        // Clear MAILBOX0 before waiting for memory scrubbing
+        regs::NV_PFALCON_FALCON_MAILBOX0::default()
+            .set_value(0)
+            .write(bar, &E::ID);
+
         util::wait_on(Delta::from_millis(20), || {
             if regs::NV_PFALCON_FALCON_HWCFG2::read(bar, &E::ID).mem_scrubbing_done() {
                 Some(())
-- 
2.34.1