Code/undervolt-pentium-m-2.6.13.1.patch

--- linux-2.6.13.1-vanilla/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c 2005-09-10 05:42:58.000000000 +0300 +++ linux-2.6.13.1/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c 2005-10-18 04:46:01.000000000 +0200 @@ -54,6 +54,7 @@ enum {

	CPU_DOTHAN_A1,
	CPU_DOTHAN_A2,
	CPU_DOTHAN_B0,

+ CPU_DOTHAN_C0,

	CPU_MP4HT_D0,
	CPU_MP4HT_E0,
};

@@ -63,6 +64,8 @@ static const struct cpu_id cpu_ids[] = {

	[CPU_DOTHAN_A1]	= { 6, 13, 1 },
	[CPU_DOTHAN_A2]	= { 6, 13, 2 },
	[CPU_DOTHAN_B0]	= { 6, 13, 6 },

+ [CPU_DOTHAN_C0] = { 6, 13, 8 },

	[CPU_MP4HT_D0]	= {15,  3, 4 },
	[CPU_MP4HT_E0]	= {15,  4, 1 },
};

@@ -94,6 +97,12 @@ static struct cpufreq_driver centrino_dr

		.frequency = (mhz) * 1000,				\
		.index = (((mhz)/100) << 8) | ((mv - 700) / 16)		\
	}

+/* Likewise, for processors with 133MHz FSB. */ +#define OP133(mhz, mv) \ + { \ + .frequency = (mhz) * 1000, \ + .index = (((mhz)/133) << 8) | ((mv - 700) / 16) \ + }

/*
 * These voltage tables were derived from the Intel Pentium M

@@ -202,7 +211,26 @@ static struct cpufreq_frequency_table ba

	OP(1700, 1484),
	{ .frequency = CPUFREQ_TABLE_END }
};

+ +/* Intel Pentium M 750, drastically undervoltaged */ +static struct cpufreq_frequency_table pentium_m_750[] = +{ + /* MHz mV */ + OP133( 800, 700), + OP133(1066, 780), + OP133(1200, 828), + OP133(1333, 876), + OP133(1466, 924), + OP133(1600, 972), + OP133(1733, 1020), + OP133(1866, 1068), + { .frequency = CPUFREQ_TABLE_END } +}; +

#undef OP

+#undef OP133

#define _BANIAS(cpuid, max, name)	\
{	.cpu_id		= cpuid,	\

@@ -225,6 +253,12 @@ static struct cpu_model models[] =

	BANIAS(1500),
	BANIAS(1600),
	BANIAS(1700),

+ { + .cpu_id = &cpu_ids[CPU_DOTHAN_C0], + .model_name = "Intel(R) Pentium(R) M processor 1.86GHz", + .max_freq = 1866000, + .op_points = pentium_m_750 + },

	/* NULL model_name is a wildcard */
	{ &cpu_ids[CPU_DOTHAN_A1], NULL, 0, NULL },