[09/15] drm/i915/dsb: functions to enable/disable DSB engine.

Submitted by Animesh Manna on Aug. 12, 2019, 8:06 a.m.

Details

Message ID 20190812080655.27535-9-animesh.manna@intel.com
State New
Headers show
Series "Series without cover letter" ( rev: 1 ) in Intel GFX - Try Bot

Not browsing as part of any series.

Commit Message

Animesh Manna Aug. 12, 2019, 8:06 a.m.
DSB will be used for performance improvement for some special scenario.
DSB engine will be enabled based on need and after completion of its work
will be disabled. Api added for enable/disable operation by using DSB_CTRL
register.

Cc: Michel Thierry <michel.thierry@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
---
 drivers/gpu/drm/i915/intel_dsb.c | 40 ++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

Patch hide | download patch | download mbox

diff --git a/drivers/gpu/drm/i915/intel_dsb.c b/drivers/gpu/drm/i915/intel_dsb.c
index 87f9da289e01..474610502e5d 100644
--- a/drivers/gpu/drm/i915/intel_dsb.c
+++ b/drivers/gpu/drm/i915/intel_dsb.c
@@ -33,6 +33,46 @@  static inline bool is_dsb_busy(struct intel_dsb *dsb)
 	return DSB_STATUS & I915_READ(DSB_CTRL(pipe, dsb->id));
 }
 
+static bool intel_dsb_enable_engine(struct intel_dsb *dsb)
+{
+	struct intel_crtc *crtc = dsb->crtc;
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+	u32 dsb_ctrl;
+
+	dsb_ctrl = I915_READ(DSB_CTRL(pipe, dsb->id));
+
+	if (DSB_STATUS & dsb_ctrl) {
+		DRM_DEBUG_KMS("DSB engine is busy.\n");
+		return false;
+	}
+
+	dsb_ctrl |= DSB_ENABLE;
+	I915_WRITE(DSB_CTRL(pipe, dsb->id), dsb_ctrl);
+
+	return true;
+}
+
+static bool intel_dsb_disable_engine(struct intel_dsb *dsb)
+{
+	struct intel_crtc *crtc = dsb->crtc;
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+	u32 dsb_ctrl;
+
+	dsb_ctrl = I915_READ(DSB_CTRL(pipe, dsb->id));
+
+	if (DSB_STATUS & dsb_ctrl) {
+		DRM_DEBUG_KMS("DSB engine is busy.\n");
+		return false;
+	}
+
+	dsb_ctrl &= ~DSB_ENABLE;
+	I915_WRITE(DSB_CTRL(pipe, dsb->id), dsb_ctrl);
+
+	return true;
+}
+
 struct intel_dsb *
 intel_dsb_get(struct intel_crtc *crtc)
 {