QUOTE(cowithgun @ Aug 13 2013, 10:29 PM)
have not use it long enough to encounter it myself...
after seeing those issues, i revert back to stock ROM with custom JWR kernel. stability is more important to me.
also, detected some instability while -175 undervolting; camera crashed. after some investigation, the 4.3 kernel uses lower vdd compare to previous kernel.
before 4.3, fast and faster CPU binding treated the same:
static struct acpu_level acpu_freq_tbl_fast[] __initdata = {
{ 1, { 384000, PLL_8, 0, 2, 0x00 }, L2(0), 850000 },
{ 0, { 432000, HFPLL, 2, 0, 0x20 }, L2(6), 875000 },
{ 1, { 486000, HFPLL, 2, 0, 0x24 }, L2(6), 875000 },
{ 0, { 540000, HFPLL, 2, 0, 0x28 }, L2(6), 900000 },
{ 1, { 594000, HFPLL, 1, 0, 0x16 }, L2(6), 900000 },
{ 0, { 648000, HFPLL, 1, 0, 0x18 }, L2(6), 925000 },
{ 1, { 702000, HFPLL, 1, 0, 0x1A }, L2(6), 925000 },
{ 0, { 756000, HFPLL, 1, 0, 0x1C }, L2(6), 975000 },
{ 1, { 810000, HFPLL, 1, 0, 0x1E }, L2(6), 975000 },
{ 0, { 864000, HFPLL, 1, 0, 0x20 }, L2(6), 1000000 },
{ 1, { 918000, HFPLL, 1, 0, 0x22 }, L2(6), 1000000 },
{ 0, { 972000, HFPLL, 1, 0, 0x24 }, L2(6), 1025000 },
{ 1, { 1026000, HFPLL, 1, 0, 0x26 }, L2(6), 1025000 },
{ 0, { 1080000, HFPLL, 1, 0, 0x28 }, L2(15), 1075000 },
{ 1, { 1134000, HFPLL, 1, 0, 0x2A }, L2(15), 1075000 },
{ 0, { 1188000, HFPLL, 1, 0, 0x2C }, L2(15), 1100000 },
{ 1, { 1242000, HFPLL, 1, 0, 0x2E }, L2(15), 1100000 },
{ 0, { 1296000, HFPLL, 1, 0, 0x30 }, L2(15), 1125000 },
{ 1, { 1350000, HFPLL, 1, 0, 0x32 }, L2(15), 1125000 },
{ 0, { 1404000, HFPLL, 1, 0, 0x34 }, L2(15), 1137500 },
{ 1, { 1458000, HFPLL, 1, 0, 0x36 }, L2(15), 1137500 },
{ 1, { 1512000, HFPLL, 1, 0, 0x38 }, L2(15), 1150000 },
{ 0, { 0 } }
};
4.3:
static struct acpu_level tbl_faster[] __initdata = {
{ 1, { 384000, PLL_8, 0, 0x00 }, L2(0), 850000 },
{ 0, { 432000, HFPLL, 2, 0x20 }, L2(5), 875000 },
{ 1, { 486000, HFPLL, 2, 0x24 }, L2(5), 875000 },
{ 0, { 540000, HFPLL, 2, 0x28 }, L2(5), 900000 },
{ 1, { 594000, HFPLL, 1, 0x16 }, L2(5), 900000 },
{ 0, { 648000, HFPLL, 1, 0x18 }, L2(5), 925000 },
{ 1, { 702000, HFPLL, 1, 0x1A }, L2(5), 925000 },
{ 0, { 756000, HFPLL, 1, 0x1C }, L2(5), 962500 },
{ 1, { 810000, HFPLL, 1, 0x1E }, L2(5), 962500 },
{ 0, { 864000, HFPLL, 1, 0x20 }, L2(5), 975000 },
{ 1, { 918000, HFPLL, 1, 0x22 }, L2(5), 975000 },
{ 0, { 972000, HFPLL, 1, 0x24 }, L2(5), 1000000 },
{ 1, { 1026000, HFPLL, 1, 0x26 }, L2(5), 1000000 },
{ 0, { 1080000, HFPLL, 1, 0x28 }, L2(14), 1050000 },
{ 1, { 1134000, HFPLL, 1, 0x2A }, L2(14), 1050000 },
{ 0, { 1188000, HFPLL, 1, 0x2C }, L2(14), 1075000 },
{ 1, { 1242000, HFPLL, 1, 0x2E }, L2(14), 1075000 },
{ 0, { 1296000, HFPLL, 1, 0x30 }, L2(14), 1100000 },
{ 1, { 1350000, HFPLL, 1, 0x32 }, L2(14), 1100000 },
{ 0, { 1404000, HFPLL, 1, 0x34 }, L2(14), 1112500 },
{ 1, { 1458000, HFPLL, 1, 0x36 }, L2(14), 1112500 },
{ 1, { 1512000, HFPLL, 1, 0x38 }, L2(14), 1125000 },
{ 0, { 0 } }
};
basically, at low freq, nothing change, but at higher freq, 4.3 already using lower voltage. so, if -175 was your limit previously, you can no longer do -175 in 4.3, because 4.3 already using a lower 25000 vdd. So, if you still wanna undervolt high freq, do it at -150 only.
Which kernel are you using? Faster binding? - 175 is kinda impressive. The max I got was only - 150.after seeing those issues, i revert back to stock ROM with custom JWR kernel. stability is more important to me.
also, detected some instability while -175 undervolting; camera crashed. after some investigation, the 4.3 kernel uses lower vdd compare to previous kernel.
before 4.3, fast and faster CPU binding treated the same:
CODE
static struct acpu_level acpu_freq_tbl_fast[] __initdata = {
{ 1, { 384000, PLL_8, 0, 2, 0x00 }, L2(0), 850000 },
{ 0, { 432000, HFPLL, 2, 0, 0x20 }, L2(6), 875000 },
{ 1, { 486000, HFPLL, 2, 0, 0x24 }, L2(6), 875000 },
{ 0, { 540000, HFPLL, 2, 0, 0x28 }, L2(6), 900000 },
{ 1, { 594000, HFPLL, 1, 0, 0x16 }, L2(6), 900000 },
{ 0, { 648000, HFPLL, 1, 0, 0x18 }, L2(6), 925000 },
{ 1, { 702000, HFPLL, 1, 0, 0x1A }, L2(6), 925000 },
{ 0, { 756000, HFPLL, 1, 0, 0x1C }, L2(6), 975000 },
{ 1, { 810000, HFPLL, 1, 0, 0x1E }, L2(6), 975000 },
{ 0, { 864000, HFPLL, 1, 0, 0x20 }, L2(6), 1000000 },
{ 1, { 918000, HFPLL, 1, 0, 0x22 }, L2(6), 1000000 },
{ 0, { 972000, HFPLL, 1, 0, 0x24 }, L2(6), 1025000 },
{ 1, { 1026000, HFPLL, 1, 0, 0x26 }, L2(6), 1025000 },
{ 0, { 1080000, HFPLL, 1, 0, 0x28 }, L2(15), 1075000 },
{ 1, { 1134000, HFPLL, 1, 0, 0x2A }, L2(15), 1075000 },
{ 0, { 1188000, HFPLL, 1, 0, 0x2C }, L2(15), 1100000 },
{ 1, { 1242000, HFPLL, 1, 0, 0x2E }, L2(15), 1100000 },
{ 0, { 1296000, HFPLL, 1, 0, 0x30 }, L2(15), 1125000 },
{ 1, { 1350000, HFPLL, 1, 0, 0x32 }, L2(15), 1125000 },
{ 0, { 1404000, HFPLL, 1, 0, 0x34 }, L2(15), 1137500 },
{ 1, { 1458000, HFPLL, 1, 0, 0x36 }, L2(15), 1137500 },
{ 1, { 1512000, HFPLL, 1, 0, 0x38 }, L2(15), 1150000 },
{ 0, { 0 } }
};
4.3:
CODE
static struct acpu_level tbl_faster[] __initdata = {
{ 1, { 384000, PLL_8, 0, 0x00 }, L2(0), 850000 },
{ 0, { 432000, HFPLL, 2, 0x20 }, L2(5), 875000 },
{ 1, { 486000, HFPLL, 2, 0x24 }, L2(5), 875000 },
{ 0, { 540000, HFPLL, 2, 0x28 }, L2(5), 900000 },
{ 1, { 594000, HFPLL, 1, 0x16 }, L2(5), 900000 },
{ 0, { 648000, HFPLL, 1, 0x18 }, L2(5), 925000 },
{ 1, { 702000, HFPLL, 1, 0x1A }, L2(5), 925000 },
{ 0, { 756000, HFPLL, 1, 0x1C }, L2(5), 962500 },
{ 1, { 810000, HFPLL, 1, 0x1E }, L2(5), 962500 },
{ 0, { 864000, HFPLL, 1, 0x20 }, L2(5), 975000 },
{ 1, { 918000, HFPLL, 1, 0x22 }, L2(5), 975000 },
{ 0, { 972000, HFPLL, 1, 0x24 }, L2(5), 1000000 },
{ 1, { 1026000, HFPLL, 1, 0x26 }, L2(5), 1000000 },
{ 0, { 1080000, HFPLL, 1, 0x28 }, L2(14), 1050000 },
{ 1, { 1134000, HFPLL, 1, 0x2A }, L2(14), 1050000 },
{ 0, { 1188000, HFPLL, 1, 0x2C }, L2(14), 1075000 },
{ 1, { 1242000, HFPLL, 1, 0x2E }, L2(14), 1075000 },
{ 0, { 1296000, HFPLL, 1, 0x30 }, L2(14), 1100000 },
{ 1, { 1350000, HFPLL, 1, 0x32 }, L2(14), 1100000 },
{ 0, { 1404000, HFPLL, 1, 0x34 }, L2(14), 1112500 },
{ 1, { 1458000, HFPLL, 1, 0x36 }, L2(14), 1112500 },
{ 1, { 1512000, HFPLL, 1, 0x38 }, L2(14), 1125000 },
{ 0, { 0 } }
};
basically, at low freq, nothing change, but at higher freq, 4.3 already using lower voltage. so, if -175 was your limit previously, you can no longer do -175 in 4.3, because 4.3 already using a lower 25000 vdd. So, if you still wanna undervolt high freq, do it at -150 only.
Aug 14 2013, 12:07 AM

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