[PATCH] drm/i915/psr: simplify enable_psr handling

[Ross Zwisler <zwisler@google.com>]

The following commit:

commit 2bdd045e3a30 ("drm/i915/psr: Check if VBT says PSR can be enabled.")

added some code with no usable functionality.  Regardless of how the psr
default is set up in the BDB_DRIVER_FEATURES section, if the enable_psr
module parameter isn't specified it defaults to 0.

Remove this dead code, simplify the way that enable_psr is handled and
update the module parameter string to match the actual functionality.

Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ross Zwisler <zwisler@google.com>
---
 drivers/gpu/drm/i915/i915_drv.h    | 1 -
 drivers/gpu/drm/i915/i915_params.c | 4 +---
 drivers/gpu/drm/i915/i915_params.h | 2 +-
 drivers/gpu/drm/i915/intel_bios.c  | 1 -
 drivers/gpu/drm/i915/intel_psr.c   | 7 -------
 5 files changed, 2 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 872a2e159a5f9..b4c50ba0b22a6 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1115,7 +1115,6 @@ struct intel_vbt_data {
 	} edp;
 
 	struct {
-		bool enable;
 		bool full_link;
 		bool require_aux_wakeup;
 		int idle_frames;
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 295e981e4a398..80ce8758c3c69 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -87,9 +87,7 @@ i915_param_named_unsafe(enable_ppgtt, int, 0400,
 	"(-1=auto [default], 0=disabled, 1=aliasing, 2=full, 3=full with extended address space)");
 
 i915_param_named_unsafe(enable_psr, int, 0600,
-	"Enable PSR "
-	"(0=disabled, 1=enabled) "
-	"Default: -1 (use per-chip default)");
+	"Enable PSR (default: false)");
 
 i915_param_named_unsafe(alpha_support, bool, 0400,
 	"Enable alpha quality driver support for latest hardware. "
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 6c4d4a21474b5..144572f17a83d 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -42,7 +42,7 @@ struct drm_printer;
 	param(int, enable_dc, -1) \
 	param(int, enable_fbc, -1) \
 	param(int, enable_ppgtt, -1) \
-	param(int, enable_psr, -1) \
+	param(int, enable_psr, 0) \
 	param(int, disable_power_well, -1) \
 	param(int, enable_ips, 1) \
 	param(int, invert_brightness, 0) \
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 1faa494e2bc91..d676d483d5cf1 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -551,7 +551,6 @@ parse_driver_features(struct drm_i915_private *dev_priv,
 	 */
 	if (!driver->drrs_enabled)
 		dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
-	dev_priv->vbt.psr.enable = driver->psr_enabled;
 }
 
 static void
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index b6838b525502e..26e7eb318cf07 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -1065,13 +1065,6 @@ void intel_psr_init(struct drm_i915_private *dev_priv)
 	if (!dev_priv->psr.sink_support)
 		return;
 
-	if (i915_modparams.enable_psr == -1) {
-		i915_modparams.enable_psr = dev_priv->vbt.psr.enable;
-
-		/* Per platform default: all disabled. */
-		i915_modparams.enable_psr = 0;
-	}
-
 	/* Set link_standby x link_off defaults */
 	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 		/* HSW and BDW require workarounds that we don't implement. */
-- 
2.20.1.415.g653613c723-goog