From 5e433fff06148fde3f0046ad7f1121e9af2181d9 Mon Sep 17 00:00:00 2001
From: Kevin O'Connor <kevin@koconnor.net>
Date: Mon, 22 Jan 2024 12:55:22 -0500
Subject: [PATCH] rp2040: Only change SPI settings while peripheral is disabled

Make sure to disable/enable the peripheral to ensure the clock
polarity is properly set prior to a change in CS.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
---
 src/rp2040/spi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/rp2040/spi.c b/src/rp2040/spi.c
index e6aafa0053a4..758d57308b79 100644
--- a/src/rp2040/spi.c
+++ b/src/rp2040/spi.c
@@ -89,8 +89,12 @@ void
 spi_prepare(struct spi_config config)
 {
     spi_hw_t *spi = config.spi;
+    if (spi->cr0 == config.cr0 && spi->cpsr == config.cpsr)
+        return;
+    spi->cr1 = 0;
     spi->cr0 = config.cr0;
     spi->cpsr = config.cpsr;
+    spi->cr1 = SPI_SSPCR1_SSE_BITS;
 }
 
 void