RE: [PATCH 00/01] CPUFreq: OMAP3 cpufreq driver

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Hi, 
 

> -----Original Message-----
> From: linux-omap-owner@xxxxxxxxxxxxxxx 
> [mailto:linux-omap-owner@xxxxxxxxxxxxxxx] On Behalf Of Rajendra Nayak
> Sent: Monday, August 11, 2008 6:42 PM
> To: linux-omap@xxxxxxxxxxxxxxx
> Subject: [PATCH 00/01] CPUFreq: OMAP3 cpufreq driver
> 
> Hi,
> 
> The patch which follows implements the CPUFreq driver for 
> OMAP3, tested on 3430sdp.
> The driver uses API's defined as part of the OMAP-PM layer.
> 
> Performance Governor is selected by default in the defconfig.
> After bootup, to switch to ondemand or any other governor use 
> the following sysfs interface 
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

With the ondemand Governor  I am some seeing issues for DSP Bridge. clk_notifier_register call for iva2_ck is successful but I am seeing below messages on opp change request from IVA.

<3>clock: Could not find fieldval 0 for clock iva2_ck parent dpll2_m2_ck
clock: Could not find fieldval 0 for clock iva2_ck parent dpll2_m2_ck
<3>clock: Could not find fieldval 0 for clock iva2_ck parent dpll2_m2_ck
clock: Could not find fieldval 0 for clock iva2_ck parent dpll2_m2_ck

Looks like access to memory stalls while opp is changing ( some times I observed MMU Fault messages from IVA while opp is changing). Also some times I observed that after the opp change IVA Power state registers are not accessible( I am getting  BUG# soft lock up while accessing IVA Power state registers).

Can you please provide your inputs on these issues?

Is there any way to manually switch opp using sysfs?( useful for debugging)

regards
Ramesh Gupta G


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