[PATCH 1/2] PPC frequency change issues

[PATCH 1/2] PPC frequency change issues

[Thomas Renninger]

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	2006-01-19 18:22:55.000000000 +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);

Re: [PATCH 1/2] PPC frequency change issues

[Thomas Renninger]

[-- Attachment #1: Type: text/plain, Size: 34 bytes --]

and the other one...

     Thomas

[-- Attachment #2: cpufreq_bios_ppc_change --]
[-- Type: text/plain, Size: 1099 bytes --]

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);

[-- Attachment #3: Type: text/plain, Size: 147 bytes --]

_______________________________________________
Cpufreq mailing list
Cpufreq@lists.linux.org.uk
http://lists.linux.org.uk/mailman/listinfo/cpufreq