@@ -26,6 +26,48 @@ static inline bool is_dsb_busy(struct intel_dsb *dsb)
return DSB_STATUS & I915_READ(DSB_CTRL(pipe, dsb->id));
}
+static inline 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);
+
+ POSTING_READ(DSB_CTRL(pipe, dsb->id));
+ return true;
+}
+
+static inline 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);
+
+ POSTING_READ(DSB_CTRL(pipe, dsb->id));
+ return true;
+}
+
struct intel_dsb *
intel_dsb_get(struct intel_crtc *crtc)
{
@@ -11675,6 +11675,7 @@ enum skl_power_gate {
#define DSBSL_INSTANCE(pipe, id) (_DSBSL_INSTANCE_BASE + \
(pipe) * 0x1000 + (id) * 100)
#define DSB_CTRL(pipe, id) _MMIO(DSBSL_INSTANCE(pipe, id) + 0x8)
+#define DSB_ENABLE (1 << 31)
#define DSB_STATUS (1 << 0)
#endif /* _I915_REG_H_ */
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. v1: Initial version. v2: POSTING_READ added after writing control register. (Shashank) 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/display/intel_dsb.c | 42 ++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_reg.h | 1 + 2 files changed, 43 insertions(+)