Attachment 64821 Details for Bug 119836

[patch] Make cpufreq-core aware of cpufreq changes done behind the back of kernel by BIOS

cpufreq_bios_ppc_change (text/plain), 1.07 KB, created by Thomas Renninger on 2006-01-24 16:58:35 UTC

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Creator: Thomas Renninger

Created: 2006-01-24 16:58:35 UTC

Size: 1.07 KB

patch

obsolete

>Author: Thomas Renninger <trenn@suse.de>
>
>BIOS might change frequency behind our back
>when BIOS changes allowed frequencies via _PPC.
>in this case cpufreq core got out of sync.
>-> ask driver for current freq and notify
>  governors about a change
>
>cpufreq.c |   10 ++++++++++
>1 files changed, 10 insertions(+)
>
>Index: linux-2.6.15/drivers/cpufreq/cpufreq.c
>===================================================================
>--- linux-2.6.15.orig/drivers/cpufreq/cpufreq.c	2006-01-03 04:21:10.000000000 +0100
>+++ linux-2.6.15/drivers/cpufreq/cpufreq.c	2006-01-20 11:11:55.000000000 +0100
>@@ -1402,6 +1402,16 @@
> 	policy.policy = data->user_policy.policy;
> 	policy.governor = data->user_policy.governor;
> 
>+    /* BIOS might change freq behind our back 
>+       -> ask driver for current freq and notify
>+          governors about a change
>+    */
>+    if (cpufreq_driver->get){
>+        policy.cur = cpufreq_driver->get(cpu);
>+        if (data->cur != policy.cur)
>+            cpufreq_out_of_sync(cpu, data->cur, policy.cur);
>+    }
>+
> 	ret = __cpufreq_set_policy(data, &policy);
> 
> 	up(&data->lock);

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