From e175eacc87c3a9e4dad0799fee0e95732520afc7 Mon Sep 17 00:00:00 2001
From: Martin Krause <martin.krause@tqs.de>
Date: Thu, 3 Apr 2008 13:37:56 +0200
Subject: [PATCH] IDE: fix bug in reset sequence

According to the ata (ata5) specification the RESET- signal
shall be asserted for at least 25 us. Without this patch,
the RESET- signal is asserted on some boards for only < 1 us
(e. g. on the TQM5200). This patch adds a general delay of
25 us to the RESET- signal.

Without this patch a Platinum 4 GiB CF card is not recognised
properly on boards with a TQM5200 (STK52xx, TB5200).

Signed-off-by: Martin Krause <martin.krause@tqs.de>
---
 common/cmd_ide.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/common/cmd_ide.c b/common/cmd_ide.c
index 8ace970c73..f9cd422f21 100644
--- a/common/cmd_ide.c
+++ b/common/cmd_ide.c
@@ -1529,6 +1529,9 @@ static void ide_reset (void)
 
 	ide_set_reset (1); /* assert reset */
 
+	/* the reset signal shall be asserted for et least 25 us */
+	udelay(25);
+
 	WATCHDOG_RESET();
 
 #ifdef CFG_PB_12V_ENABLE
-- 
2.39.5