Clock settings

Lars-Peter Clausen lars at metafoo.de
Sun Nov 8 11:32:03 EST 2009


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Xiangfu Liu wrote:
> Hi Bas Wijnen
>
> here is some info:
> ----
> root at BenNanoNote:/proc/jz# ls
> cgm   emc   imem  ipu   mmc   pmc   udc
>
> root at BenNanoNote:/proc/jz# more cgm
> CPPCR          : 0x1b000520
> CPCCR          : 0x40632220
> PLL            : ON
> m:n:o          : 56:2:1
> C:H:M:P        : 1:3:3:3
> PLL Freq       : 336.00 MHz
> CCLK           : 336.00 MHz
> HCLK           : 112.00 MHz
> MCLK           : 112.00 MHz
> PCLK           : 112.00 MHz
> LCDCLK         :  84.00 MHz
> PIXCLK         : 25846.15 KHz
> I2SCLK         :  12.00 MHz
> USBCLK         :  12.00 MHz
> MSCCLK         :  24.00 MHz
> EXTALCLK       :  12.00 MHz
> RTCCLK         :   0.03 MHz
>
> root at BenNanoNote:/proc/jz# more emc
> SMCR(0-5): 0x00000080 0x094c4400 0x0fff7700 0x0fff7700 0x0fff7700
> SACR(0-5): 0x00001cfc 0x000018fc 0x000014fc 0x00000cfc 0x000008fc
> DMCR:      0x85aa3211
> RTCSR:     0x0083
> RTCOR:     0x001f
>
> root at BenNanoNote:/proc/jz# more pmc
> Low Power Mode : IDLE
> Doze Mode      : off
> IPU            : running
> DMAC           : running
> UHC            : running
> UDC            : stopped
> LCD            : running
> CIM            : running
> SADC           : running
> MSC            : running
> AIC1           : running
> AIC2           : running
> SSI            : running
> I2C            : running
> RTC            : running
> TCU            : running
> UART1          : running
> UART0          : running
>
> Bas Wijnen wrote:
>> Hi,
>>
>> In the Linux source, I don't see any clocks being set up.  Possibly they
>> aren't, and the boot values are maintained.  However, since I have some
>> trouble with my lcd driver which might be related to the clocks
>> settings, I would like someone who has Linux running on the Ben to tell
>> me what their clocks are set to.  This info can be found in /proc/cgm.
>> While you're at it, please also tell me what's in /proc/emc and
>> /proc/pmc.
>>
>> Thanks,
>> Bas
>>
Hi

Please note that the value is not quite optimal. Currently the display
is driven with 90Hz and I guess we could do fine with less to reduce
power consumtion and also remove stress from the ram.

- - Lars

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