[CPUFREQ] Powernow-k8: support family 0xf with 2 low p-states
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>
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index 81cbe64..ae068f59 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -299,7 +299,7 @@
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 @@
/* 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 @@
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 @@
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 @@
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 @@
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);