From: maximilian attems <max@stro.at>
Date: Thu, 8 May 2008 20:10:01 +0000 (+0200)
Subject: [CPUFREQ] Crusoe: longrun cpufreq module reports false min freq
X-Git-Tag: v3.12-rc1~20392^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=667ad4f70110357e8f024e81741c7bd1d7906e7d;p=kernel%2Fkernel-generic.git

[CPUFREQ] Crusoe: longrun cpufreq module reports false min freq

The longrun cpufreq module reports a false minimum frequency 3MHz on
300-600MHz Crusoe processor.  This may be due to a calculation bug
in the module.

Original patch from Kaz Sasayama <kazssym@hypercore.co.jp>
submitted as http://bugs.debian.org/468149 patch ported to x86

Cc: Kaz Sasayama <kazssym@hypercore.co.jp>
Signed-off-by: maximilian attems <max@stro.at>
Signed-off-by: Dave Jones <davej@redhat.com>
---

diff --git a/arch/x86/kernel/cpu/cpufreq/longrun.c b/arch/x86/kernel/cpu/cpufreq/longrun.c
index af4a867..777a7ff 100644
--- a/arch/x86/kernel/cpu/cpufreq/longrun.c
+++ b/arch/x86/kernel/cpu/cpufreq/longrun.c
@@ -245,7 +245,7 @@ static unsigned int __init longrun_determine_freqs(unsigned int *low_freq,
 	if ((ecx > 95) || (ecx == 0) || (eax < ebx))
 		return -EIO;
 
-	edx = (eax - ebx) / (100 - ecx);
+	edx = ((eax - ebx) * 100) / (100 - ecx);
 	*low_freq = edx * 1000; /* back to kHz */
 
 	dprintk("low frequency is %u kHz\n", *low_freq);