[PATCH v3 3/4] drm/i915/display: add module parameter to enable DMC wakelock

[Luca Coelho <luciano.coelho@intel.com>]

This feature should be disabled by default until properly tested and
mature.  Add a module parameter to enable the feature for testing,
while keeping it disabled by default for now.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_params.c |  5 +++++
 drivers/gpu/drm/i915/display/intel_display_params.h |  1 +
 drivers/gpu/drm/i915/display/intel_dmc_wl.c         | 12 ++++++++----
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_params.c b/drivers/gpu/drm/i915/display/intel_display_params.c
index 11e03cfb774d..f40b223cc8a1 100644
--- a/drivers/gpu/drm/i915/display/intel_display_params.c
+++ b/drivers/gpu/drm/i915/display/intel_display_params.c
@@ -116,6 +116,11 @@ intel_display_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400,
 	"(0=disabled, 1=enabled) "
 	"Default: 1");
 
+intel_display_param_named_unsafe(enable_dmc_wl, bool, 0400,
+	"Enable DMC wakelock "
+	"(0=disabled, 1=enabled) "
+	"Default: 0");
+
 __maybe_unused
 static void _param_print_bool(struct drm_printer *p, const char *driver_name,
 			      const char *name, bool val)
diff --git a/drivers/gpu/drm/i915/display/intel_display_params.h b/drivers/gpu/drm/i915/display/intel_display_params.h
index 6206cc51df04..bf8dbbdb20a1 100644
--- a/drivers/gpu/drm/i915/display/intel_display_params.h
+++ b/drivers/gpu/drm/i915/display/intel_display_params.h
@@ -46,6 +46,7 @@ struct drm_i915_private;
 	param(int, enable_psr, -1, 0600) \
 	param(bool, psr_safest_params, false, 0400) \
 	param(bool, enable_psr2_sel_fetch, true, 0400) \
+	param(bool, enable_dmc_wl, false, 0400) \
 
 #define MEMBER(T, member, ...) T member;
 struct intel_display_params {
diff --git a/drivers/gpu/drm/i915/display/intel_dmc_wl.c b/drivers/gpu/drm/i915/display/intel_dmc_wl.c
index 7c991e22c616..84d054bcb2c1 100644
--- a/drivers/gpu/drm/i915/display/intel_dmc_wl.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc_wl.c
@@ -120,7 +120,8 @@ void intel_dmc_wl_enable(struct drm_i915_private *i915)
 	struct intel_dmc_wl *wl = &i915->display.wl;
 	unsigned long flags;
 
-	if (DISPLAY_VER(i915) < 20)
+	if (!i915->display.params.enable_dmc_wl ||
+	    DISPLAY_VER(i915) < 20)
 		return;
 
 	spin_lock_irqsave(&wl->lock, flags);
@@ -146,7 +147,8 @@ void intel_dmc_wl_disable(struct drm_i915_private *i915)
 	struct intel_dmc_wl *wl = &i915->display.wl;
 	unsigned long flags;
 
-	if (DISPLAY_VER(i915) < 20)
+	if (!i915->display.params.enable_dmc_wl ||
+	    DISPLAY_VER(i915) < 20)
 		return;
 
 	flush_delayed_work(&wl->work);
@@ -177,7 +179,8 @@ void intel_dmc_wl_get(struct drm_i915_private *i915, i915_reg_t reg)
 	struct intel_dmc_wl *wl = &i915->display.wl;
 	unsigned long flags;
 
-	if (DISPLAY_VER(i915) < 20)
+	if (!i915->display.params.enable_dmc_wl ||
+	    DISPLAY_VER(i915) < 20)
 		return;
 
 	if (!intel_dmc_wl_check_range(reg.reg))
@@ -212,7 +215,8 @@ void intel_dmc_wl_put(struct drm_i915_private *i915, i915_reg_t reg)
 	struct intel_dmc_wl *wl = &i915->display.wl;
 	unsigned long flags;
 
-	if (DISPLAY_VER(i915) < 20)
+	if (!i915->display.params.enable_dmc_wl ||
+	    DISPLAY_VER(i915) < 20)
 		return;
 
 	if (!intel_dmc_wl_check_range(reg.reg))
-- 
2.39.2