From 35da5ccac9eb6df4ae2c0bfc674247a5d2f40c8c Mon Sep 17 00:00:00 2001
From: Dominic Fischer <git@dominicfischer.me>
Date: Fri, 2 Aug 2024 22:38:14 +0100
Subject: [PATCH] Add delay between starting DMA TX and SPI driver

---
 esp-hal/src/spi/master.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/esp-hal/src/spi/master.rs b/esp-hal/src/spi/master.rs
index 2f3c400070f..b62739c7ba3 100644
--- a/esp-hal/src/spi/master.rs
+++ b/esp-hal/src/spi/master.rs
@@ -2074,6 +2074,13 @@ pub trait InstanceDma: Instance {
         tx.start_transfer()?;
         reset_dma_before_usr_cmd(reg_block);
 
+        // Wait for at least one clock cycle for the DMA to fill the SPI async FIFO, before
+        // starting the SPI
+        #[cfg(riscv)]
+        riscv::asm::delay(1);
+        #[cfg(xtensa)]
+        xtensa_lx::timer::delay(1);
+
         reg_block.cmd().modify(|_, w| w.usr().set_bit());
 
         Ok(())