drm/nouveau: allow static performance level setting
Guarded by a module parameter for the moment, read the code for the
magic value which enables it.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_pm.c b/drivers/gpu/drm/nouveau/nouveau_pm.c
index 9cf5fd6..9e8e14e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_pm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_pm.c
@@ -28,6 +28,78 @@
#include "nouveau_pm.h"
static int
+nouveau_pm_clock_set(struct drm_device *dev, u8 id, u32 khz)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
+ void *pre_state;
+
+ if (khz == 0)
+ return 0;
+
+ pre_state = pm->clock_pre(dev, id, khz);
+ if (IS_ERR(pre_state))
+ return PTR_ERR(pre_state);
+
+ if (pre_state)
+ pm->clock_set(dev, pre_state);
+ return 0;
+}
+
+static int
+nouveau_pm_profile_set(struct drm_device *dev, const char *profile)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
+ struct nouveau_pm_level *perflvl = NULL;
+ int ret;
+
+ /* safety precaution, for now */
+ if (nouveau_perflvl_wr != 7777)
+ return -EPERM;
+
+ if (!pm->clock_set)
+ return -EINVAL;
+
+ if (!strncmp(profile, "boot", 4))
+ perflvl = &pm->boot;
+ else {
+ int pl = simple_strtol(profile, NULL, 10);
+ int i;
+
+ for (i = 0; i < pm->nr_perflvl; i++) {
+ if (pm->perflvl[i].id == pl) {
+ perflvl = &pm->perflvl[i];
+ break;
+ }
+ }
+
+ if (!perflvl)
+ return -EINVAL;
+ }
+
+ if (perflvl == pm->cur)
+ return 0;
+
+ NV_INFO(dev, "setting performance level: %s\n", profile);
+ if (pm->voltage.supported && pm->voltage_set && perflvl->voltage) {
+ ret = pm->voltage_set(dev, perflvl->voltage);
+ if (ret) {
+ NV_ERROR(dev, "voltage_set %d failed: %d\n",
+ perflvl->voltage, ret);
+ }
+ }
+
+ nouveau_pm_clock_set(dev, PLL_CORE, perflvl->core);
+ nouveau_pm_clock_set(dev, PLL_SHADER, perflvl->shader);
+ nouveau_pm_clock_set(dev, PLL_MEMORY, perflvl->memory);
+ nouveau_pm_clock_set(dev, PLL_UNK05, perflvl->unk05);
+
+ pm->cur = perflvl;
+ return 0;
+}
+
+static int
nouveau_pm_perflvl_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
@@ -130,7 +202,13 @@
nouveau_pm_set_perflvl(struct device *d, struct device_attribute *a,
const char *buf, size_t count)
{
- return -EPERM;
+ struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
+ int ret;
+
+ ret = nouveau_pm_profile_set(dev, buf);
+ if (ret)
+ return ret;
+ return strlen(buf);
}
DEVICE_ATTR(performance_level, S_IRUGO | S_IWUSR,
@@ -163,6 +241,15 @@
NV_INFO(dev, "c: %s", info);
}
+ /* switch performance levels now if requested */
+ if (nouveau_perflvl != NULL) {
+ ret = nouveau_pm_profile_set(dev, nouveau_perflvl);
+ if (ret) {
+ NV_ERROR(dev, "error setting perflvl \"%s\": %d\n",
+ nouveau_perflvl, ret);
+ }
+ }
+
/* initialise sysfs */
ret = device_create_file(d, &dev_attr_performance_level);
if (ret)