From d81151a1c65e0789270d144e0130f9d4b2b048d3 Mon Sep 17 00:00:00 2001
From: Phil Howard <phil@pimoroni.com>
Date: Mon, 18 Jul 2022 15:32:56 +0100
Subject: [PATCH] Inky Frame: Sensible limit on SDCard speed.

Going any faster will result in corruption- this showed up as visible lines of distortion down decoded JPEG files.
---
 drivers/sdcard/sdcard.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/sdcard/sdcard.c b/drivers/sdcard/sdcard.c
index 3da9f9e4..754a82f7 100644
--- a/drivers/sdcard/sdcard.c
+++ b/drivers/sdcard/sdcard.c
@@ -51,7 +51,7 @@
 #define CT_BLOCK       0x08            /* Block addressing */
 
 #define CLK_SLOW	(100 * KHZ)
-#define CLK_FAST	(50 * MHZ)
+#define CLK_FAST	(30 * MHZ)
 
 static volatile
 DSTATUS Stat = STA_NOINIT;	/* Physical drive status */