On 08/21/2011 06:50 PM, Julian Andres Klode wrote:
On Sun, Aug 21, 2011 at 01:09:09PM +0100, Gordan Bobic wrote:
On 08/21/2011 12:27 PM, Julian Andres Klode wrote:
On Sun, Aug 21, 2011 at 12:06:39PM +0100, Gordan Bobic wrote:
Really? It complains about a max of 1000mV? On my AC100 975mV and
above produces no error. What model did you say you have?
Yes, a 10V. It should be fairly obvious the cpu_millivolts in
tegra2_dvfs.c includes 1100, the default level is 1100, as can
be seen in cpu_speedo_max_millivolts array, and
tegra2_dvfs_rail_vdd_cpu.
Hmm, that's interesting. So how do the differences between what's in
tegra2_dvfs.c and what's in board-paz00-power.c get reconciled?
Aren't these settings redundant?
I'm also curious how come my powertop is showing 1000MHz with no
errors in the log when I set SM1 to 975mV.
Buggy powertop? The 1000 MHz is linked to 1100 mV in the DVFS
code, I annotated the following cpu frequency table with the
corresponding voltages.
{ 0, 216000 }, /* 750 mV */
{ 1, 312000 }, /* 800 mV */
{ 2, 456000 }, /* 850 mV */
{ 3, 608000 }, /* 900 mV */
{ 4, 760000 }, /* 950 mV */
{ 5, 816000 }, /* 1000 mV */
{ 6, 912000 }, /* 1050 mV */
{ 7, 1000000 }, /* 1100 mV */
There is no way that I can see how you would be able to get
to 1 GHz @ 1 V without also modifying the corresponding
tables in tegra2_dvfs.c:
static const int cpu_millivolts[MAX_DVFS_FREQS] =
{750, 775, 800, 825, 850, 875, 900, 925, 950, 975, 1000, 1025,
1050, 1100, 1125};
Given my observations in a previous email, I made some assumptions and
changed this array to the following:
static const int cpu_millivolts[MAX_DVFS_FREQS] =
{850, 850, 850, 900, 1000, 1000, 1050, 1050, 1100, 1100, 1100, 1100,
1100, 1100, 1100};
The idea was that if I am seeing the following with the default values:
216MHz -> 750mV
312MHz -> 750mV
456MHz -> 750mV
608MHz -> 825mV
760MHz -> 875mV
816MHz -> 875mV
912MHz -> 925mV
1000MHz -> 975mV
I could adjust those voltage values to what I want them to be.
Unfortunately, that renders the kernel unbootable. Can't see any output
on the screen. Any idea as to why that might be happening?
Gordan
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