[PATCH 7/8] drm/i915/skl: Add boot parameter for disabling DC6

Patrik Jakobsson
2015-11-03T12:31:41Z

Signed-off-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_params.c | 6 ++++++
drivers/gpu/drm/i915/intel_runtime_pm.c | 2 +-
3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index efb6a00..9c8cb43 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2660,6 +2660,7 @@ struct i915_params {
int panel_use_ssc;
int vbt_sdvo_panel_type;
int enable_rc6;
+ int enable_dc6;
int enable_fbc;
int enable_ppgtt;
int enable_execlists;
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 368df67..1a7dedf 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -32,6 +32,7 @@ struct i915_params i915 __read_mostly = {
.panel_use_ssc = -1,
.vbt_sdvo_panel_type = -1,
.enable_rc6 = -1,
+ .enable_dc6 = 1,
.enable_fbc = -1,
.enable_execlists = -1,
.enable_hangcheck = true,
@@ -79,6 +80,11 @@ MODULE_PARM_DESC(enable_rc6,
"For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. "
"default: -1 (use per-chip default)");

+module_param_named(enable_dc6, i915.enable_dc6, int, 0400);
+MODULE_PARM_DESC(enable_dc6,
+ "Enable power-saving display C-state 6. "
+ "(0 = disable; 1 = enable [default])");
+
module_param_named_unsafe(enable_fbc, i915.enable_fbc, int, 0600);
MODULE_PARM_DESC(enable_fbc,
"Enable frame buffer compression for power savings "
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 042d92f..4843c5c 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -753,7 +753,7 @@ static void skl_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
static void skl_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_dc6)
skl_enable_dc6(dev_priv);
else
gen9_enable_dc5(dev_priv);
--
2.1.4