[Nouveau] [PATCH] drm/nouveau: add voltage workaround for buggy vbioses
Maarten Lankhorst
maarten.lankhorst at canonical.com
Fri Nov 16 08:46:04 PST 2012
Required to find all performance levels on my nvc0.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>
---
diff --git a/drivers/gpu/drm/nouveau/nouveau_perf.c b/drivers/gpu/drm/nouveau/nouveau_perf.c
index 4fe883c..624cbd1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_perf.c
+++ b/drivers/gpu/drm/nouveau/nouveau_perf.c
@@ -251,6 +251,7 @@ static void
nouveau_perf_voltage(struct drm_device *dev, struct nouveau_pm_level *perflvl)
{
struct nouveau_drm *drm = nouveau_drm(dev);
+ struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
struct bit_entry P;
u8 *vmap;
int id;
@@ -287,6 +288,20 @@ nouveau_perf_voltage(struct drm_device *dev, struct nouveau_pm_level *perflvl)
perflvl->volt_min = ROM32(vmap[0]);
perflvl->volt_max = ROM32(vmap[4]);
}
+
+ /* Adjust for buggy bioses */
+ if (!volt->step_uv || !volt->step_ofs)
+ return;
+
+ if (perflvl->volt_min % volt->step_uv != volt->step_ofs) {
+ perflvl->volt_min -= perflvl->volt_min % volt->step_uv;
+ perflvl->volt_min += volt->step_ofs;
+ }
+
+ if (perflvl->volt_max % volt->step_uv != volt->step_ofs) {
+ perflvl->volt_max -= perflvl->volt_max % volt->step_uv;
+ perflvl->volt_max += volt->step_ofs;
+ }
}
void
diff --git a/drivers/gpu/drm/nouveau/nouveau_pm.h b/drivers/gpu/drm/nouveau/nouveau_pm.h
index 73b789c..967c27c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_pm.h
+++ b/drivers/gpu/drm/nouveau/nouveau_pm.h
@@ -40,6 +40,7 @@ struct nouveau_pm_voltage {
struct nouveau_pm_voltage_level *level;
int nr_level;
+ u16 step_uv, step_ofs;
};
/* Exclusive upper limits */
diff --git a/drivers/gpu/drm/nouveau/nouveau_volt.c b/drivers/gpu/drm/nouveau/nouveau_volt.c
index 9976414..c8d0c00 100644
--- a/drivers/gpu/drm/nouveau/nouveau_volt.c
+++ b/drivers/gpu/drm/nouveau/nouveau_volt.c
@@ -236,6 +236,9 @@ nouveau_volt_init(struct drm_device *dev)
voltage->level[vid].vid = vid;
volt_uv += step_uv;
}
+ voltage->step_uv = step_uv >= 0 ? step_uv : -step_uv;
+ if (step_uv)
+ voltage->step_ofs = volt_uv % voltage->step_uv;
}
voltage->supported = true;
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