Hi,
I was trying to change the MPU frequency by using the bootarg mpurate.
But there was no impact of the same.
In the bootlog:
...
...
Clocking rate (Crystal/DPLL/ARM core): 26.0/332/500 MHz
...later..
Switched to new clocking rate (Crystal/Core/MPU): 26.0/332/500 MHz
...
...
>From the code, it clearly seemed to be ignored. So, I made the change below:
diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index 045da92..5bdd978 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -948,13 +948,20 @@ static int __init omap2_clk_arch_init(void)
if (clk_set_rate(&virt_prcm_set, mpurate))
printk(KERN_ERR "Could not find matching MPU rate\n");
#endif
+ printk(KERN_ERR "Before change: %ld\n", dpll1_ck.rate);
+
+ if (clk_set_rate(&dpll1_ck, mpurate))
+ printk(KERN_ERR "*** Unable to set MPU rate\n");
+ omap3_dpll_recalc(&dpll1_ck);
+
+ printk(KERN_ERR "After change: %ld\n", dpll1_ck.rate);
recalculate_root_clocks();
- printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL3/MPU): "
+ printk(KERN_INFO "Switched to new clocking rate (Crystal/Core/MPU): "
"%ld.%01ld/%ld/%ld MHz\n",
(osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10,
- (core_ck.rate / 1000000), (dpll1_fck.rate / 1000000)) ;
+ (core_ck.rate / 1000000), (dpll1_ck.rate / 1000000)) ;
return 0;
}
Now the bootlog seems fine:
...
...
Clocking rate (Crystal/DPLL/ARM core): 26.0/332/500 MHz
...later..
Switched to new clocking rate (Crystal/Core/MPU): 26.0/332/550 MHz
...
...
However, cat /cpu/procinfo still shows:
Processor : ARMv7 Processor rev 3 (v7l)
BogoMIPS : 499.92
Features : swp half thumb fastmult vfp edsp neon vfpv3
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x1
CPU part : 0xc08
CPU revision : 3
Am I missing some step here?
Also, I tried changing arm_ck directly (evidently not right) as well :(
Best regards,
Sanjeev
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