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

[Rodrigo Vivi]

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)

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
---
 drivers/gpu/drm/i915/i915_dma.c | 4 ++++
 include/uapi/drm/i915_drm.h     | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index adb319b..f924388 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1000,6 +1000,10 @@ 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 = IS_HASWELL(dev) &&
+			I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE;
+		break;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", param->param);
 		return -EINVAL;
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