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[CPUFREQ] Powernow-k8: support family 0xf with 2 low p-states

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Provide support for family 0xf processors with 2 P-states
below the elevator voltage.  Remove the checks that prevent
this configuration from being supported and increase the
transition voltage to prevent errors during the transition.

Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Mark Langsdorf 2009-07-26 10:55:25 -05:00 committed by Dave Jones
parent 3f4a782b5c
commit a2e1b4c312
2 changed files with 13 additions and 20 deletions
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30
arch/x86/kernel/cpu/cpufreq/powernow-k8.c
View File

@ -299,7 +299,7 @@ static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
static int transition_fid_vid(struct powernow_k8_data *data,
u32 reqfid, u32 reqvid)
{
if (core_voltage_pre_transition(data, reqvid))
if (core_voltage_pre_transition(data, reqvid, reqfid))
return 1;
if (core_frequency_transition(data, reqfid))
@ -327,17 +327,20 @@ static int transition_fid_vid(struct powernow_k8_data *data,
/* Phase 1 - core voltage transition ... setup voltage */
static int core_voltage_pre_transition(struct powernow_k8_data *data,
u32 reqvid)
u32 reqvid, u32 reqfid)
{
u32 rvosteps = data->rvo;
u32 savefid = data->currfid;
u32 maxvid, lo;
u32 maxvid, lo, rvomult = 1;
dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, "
"reqvid 0x%x, rvo 0x%x\n",
smp_processor_id(),
data->currfid, data->currvid, reqvid, data->rvo);
if ((savefid < LO_FID_TABLE_TOP) && (reqfid < LO_FID_TABLE_TOP))
rvomult = 2;
rvosteps *= rvomult;
rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
maxvid = 0x1f & (maxvid >> 16);
dprintk("ph1 maxvid=0x%x\n", maxvid);
@ -351,7 +354,8 @@ static int core_voltage_pre_transition(struct powernow_k8_data *data,
return 1;
}
while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
while ((rvosteps > 0) &&
((rvomult * data->rvo + data->currvid) > reqvid)) {
if (data->currvid == maxvid) {
rvosteps = 0;
} else {
@ -384,13 +388,6 @@ static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
u32 vcoreqfid, vcocurrfid, vcofiddiff;
u32 fid_interval, savevid = data->currvid;
if ((reqfid < HI_FID_TABLE_BOTTOM) &&
(data->currfid < HI_FID_TABLE_BOTTOM)) {
printk(KERN_ERR PFX "ph2: illegal lo-lo transition "
"0x%x 0x%x\n", reqfid, data->currfid);
return 1;
}
if (data->currfid == reqfid) {
printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n",
data->currfid);
@ -407,6 +404,9 @@ static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
: vcoreqfid - vcocurrfid;
if ((reqfid <= LO_FID_TABLE_TOP) && (data->currfid <= LO_FID_TABLE_TOP))
vcofiddiff = 0;
while (vcofiddiff > 2) {
(data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
@ -1081,14 +1081,6 @@ static int transition_frequency_fidvid(struct powernow_k8_data *data,
return 0;
}
if ((fid < HI_FID_TABLE_BOTTOM) &&
(data->currfid < HI_FID_TABLE_BOTTOM)) {
printk(KERN_ERR PFX
"ignoring illegal change in lo freq table-%x to 0x%x\n",
data->currfid, fid);
return 1;
}
dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
smp_processor_id(), fid, vid);
freqs.old = find_khz_freq_from_fid(data->currfid);

3
arch/x86/kernel/cpu/cpufreq/powernow-k8.h
View File

@ -215,7 +215,8 @@ struct pst_s {
#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "powernow-k8", msg)
static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid);
static int core_voltage_pre_transition(struct powernow_k8_data *data,
u32 reqvid, u32 regfid);
static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid);
static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid);