[PATCH] drm/i915: Adding global I915_PARAM for PSR ENABLED.

[Rodrigo Vivi <rodrigo.vivi@gmail.com>]

This global value allows userspace know when PSR is enabled.

This will allow userspace emit more busy_ioctl when doing directly copy_area
operations through scanout allowing forced psr exit.

v2: Check for PSR enabled instead of active. (by Chris Wilson)
v3: Use existing intel_edp_is_psr_enabled function.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
---
 drivers/gpu/drm/i915/i915_dma.c  | 3 +++
 drivers/gpu/drm/i915/intel_dp.c  | 2 +-
 drivers/gpu/drm/i915/intel_drv.h | 1 +
 include/uapi/drm/i915_drm.h      | 1 +
 4 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index adb319b..fcff947 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1000,6 +1000,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
 	case I915_PARAM_HAS_EXEC_HANDLE_LUT:
 		value = 1;
 		break;
+	case I915_PARAM_PSR_ENABLED:
+		value = intel_edp_is_psr_enabled(dev);
+		break;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", param->param);
 		return -EINVAL;
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 91d3bd6..a5c9567 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1356,7 +1356,7 @@ static bool is_edp_psr(struct intel_dp *intel_dp)
 		(intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED));
 }
 
-static bool intel_edp_is_psr_enabled(struct drm_device *dev)
+bool intel_edp_is_psr_enabled(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 69224d2..4369324 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -843,5 +843,6 @@ extern bool intel_set_pch_fifo_underrun_reporting(struct drm_device *dev,
 extern void intel_edp_psr_enable(struct intel_dp* intel_dp);
 extern void intel_edp_psr_disable(struct intel_dp* intel_dp);
 extern void intel_edp_psr_update(struct drm_device *dev);
+extern bool intel_edp_is_psr_enabled(struct drm_device *dev);
 
 #endif /* __INTEL_DRV_H__ */
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 923ed7f..a5db73b 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -310,6 +310,7 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_HAS_PINNED_BATCHES	 24
 #define I915_PARAM_HAS_EXEC_NO_RELOC	 25
 #define I915_PARAM_HAS_EXEC_HANDLE_LUT   26
+#define I915_PARAM_PSR_ENABLED		 27
 
 typedef struct drm_i915_getparam {
 	int param;
-- 
1.8.1.4