[Intel-gfx] drm/i915/slpc: Enable SLPC, where supported

[Sagar Arun Kamble]

From: Tom O'Rourke <Tom.O'Rourke at intel.com>

This patch makes SLPC enabled by default on
platforms with hardware/firmware support.

v5: Removing warning "enable_slpc < 0" as it is
set to -1 with this patch now. This was caught by CI BAT.

Signed-off-by: Tom O'Rourke <Tom.O'Rourke at intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
---
 drivers/gpu/drm/i915/i915_params.c | 4 ++--
 drivers/gpu/drm/i915/intel_guc.h   | 1 -
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 72b3097..7b3b3fd 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -36,7 +36,7 @@ struct i915_params i915 __read_mostly = {
 	.enable_dc = -1,
 	.enable_fbc = -1,
 	.enable_execlists = -1,
-	.enable_slpc = 0,
+	.enable_slpc = -1,
 	.enable_hangcheck = true,
 	.enable_ppgtt = -1,
 	.enable_psr = -1,
@@ -135,7 +135,7 @@ MODULE_PARM_DESC(enable_execlists,
 module_param_named_unsafe(enable_slpc, i915.enable_slpc, int, 0400);
 MODULE_PARM_DESC(enable_slpc,
 	"Override single-loop-power-controller (slpc) usage. "
-	"(-1=auto, 0=disabled [default], 1=enabled)");
+	"(-1=auto [default], 0=disabled, 1=enabled)");
 
 module_param_named_unsafe(enable_psr, i915.enable_psr, int, 0600);
 MODULE_PARM_DESC(enable_psr, "Enable PSR "
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 4a551f6..b340733 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -151,7 +151,6 @@ struct intel_guc {
 
 static inline int intel_slpc_enabled(void)
 {
-        WARN_ON(i915.enable_slpc < 0);
         return i915.enable_slpc;
 }
 
-- 
1.9.1