drm/i915/gen9: Add boot parameter for disabling DC6
v2: Use _unsafe (Jani)
v3: Allow specifying specific DC-states instead of just DC6 (Imre)
Signed-off-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1447682467-6237-3-git-send-email-patrik.jakobsson@linux.intel.com
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index ad87adcc..f816775 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -417,6 +417,11 @@
WARN_ON_ONCE(state & ~mask);
+ if (i915.enable_dc == 0)
+ state = DC_STATE_DISABLE;
+ else if (i915.enable_dc == 1 && state > DC_STATE_EN_UPTO_DC5)
+ state = DC_STATE_EN_UPTO_DC5;
+
if (state & DC_STATE_EN_UPTO_DC5_DC6_MASK)
gen9_set_dc_state_debugmask_memory_up(dev_priv);
@@ -525,7 +530,9 @@
static void gen9_disable_dc5_dc6(struct drm_i915_private *dev_priv)
{
assert_can_disable_dc5(dev_priv);
- assert_can_disable_dc6(dev_priv);
+
+ if (IS_SKYLAKE(dev_priv) && i915.enable_dc != 0 && i915.enable_dc != 1)
+ assert_can_disable_dc6(dev_priv);
gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
}
@@ -712,7 +719,7 @@
static void gen9_dc_off_power_well_disable(struct drm_i915_private *dev_priv,
struct i915_power_well *power_well)
{
- if (IS_SKYLAKE(dev_priv))
+ if (IS_SKYLAKE(dev_priv) && i915.enable_dc != 0 && i915.enable_dc != 1)
skl_enable_dc6(dev_priv);
else
gen9_enable_dc5(dev_priv);
@@ -724,7 +731,8 @@
if (power_well->count > 0) {
gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
} else {
- if (IS_SKYLAKE(dev_priv))
+ if (IS_SKYLAKE(dev_priv) && i915.enable_dc != 0 &&
+ i915.enable_dc != 1)
gen9_set_dc_state(dev_priv, DC_STATE_EN_UPTO_DC6);
else
gen9_set_dc_state(dev_priv, DC_STATE_EN_UPTO_DC5);