linux-kernel - [PXA] A question about PXA310 cpufreq for 806Mhz

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 10 Feb 2011 17:22:51 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-arm-kernel@...ts.infradead.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Haojian Zhuang <haojian.zhuang@...il.com>,
	Eric Miao <eric.y.miao@...il.com>
Subject: [PXA] A question about PXA310 cpufreq for 806Mhz

hi,

I have a device equipped with 806Mhz PXA310 cpu.
After bootup, the system shows it is running with 624Mhz.

# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
624000
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
624000

# cat /proc/cpuinfo
Processor       : XScale-V3 based processor rev 2 (v5l)
BogoMIPS        : 623.00
Features        : swp half thumb fastmult edsp iwmmxt 
CPU implementer : 0x69
CPU architecture: 5TE
CPU variant     : 0x0
CPU part        : 0x689
CPU revision    : 2

Hardware        : Getac PS236 Handheld Platform
Revision        : 0000
Serial          : 0000000000000000

I fix it by below patch and it looks ok on my device.
I'm not sure if this is a proper way to fix it, I appreciate to see your comments.

It is strange that I cannot find 806Mhz PXA31x CPU 
in the datasheet Section 6.1 PXA3XX Processor Differences.
But in Section 6.7, Table 55: PXA31x Core PLL, Turbo and Run Mode Output Frequencies,
I do see 806Mhz support on the table.

Regards,
Axel

diff --git a/arch/arm/mach-pxa/cpufreq-pxa3xx.c b/arch/arm/mach-pxa/cpufreq-pxa3xx.c
index 88fbec0..abf7d7a 100644
--- a/arch/arm/mach-pxa/cpufreq-pxa3xx.c
+++ b/arch/arm/mach-pxa/cpufreq-pxa3xx.c
@@ -210,15 +210,14 @@ static int pxa3xx_cpufreq_init(struct cpufreq_policy *policy)
 
 	/* set default policy and cpuinfo */
 	policy->cpuinfo.min_freq = 104000;
-	policy->cpuinfo.max_freq = (cpu_is_pxa320()) ? 806000 : 624000;
+	policy->cpuinfo.max_freq = (cpu_is_pxa300()) ? 624000 : 806000;
 	policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
 	policy->max = pxa3xx_get_clk_frequency_khz(0);
 	policy->cur = policy->min = policy->max;
 
-	if (cpu_is_pxa300() || cpu_is_pxa310())
+	if (cpu_is_pxa300())
 		ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa300_freqs));
-
-	if (cpu_is_pxa320())
+	else if (cpu_is_pxa310() || cpu_is_pxa320())
 		ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa320_freqs));
 
 	if (ret) {



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/