From f7619c47983431fc5ddfa30d8f921a6a40e0223a Mon Sep 17 00:00:00 2001 From: Animesh Manna Date: Fri, 20 Sep 2019 17:29:26 +0530 Subject: [PATCH] drm/i915/dsb: functions to enable/disable DSB engine. 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) v3: cosmetic changes done. (Shashank) Cc: Michel Thierry Cc: Jani Nikula Cc: Rodrigo Vivi Cc: Shashank Sharma Reviewed-by: Shashank Sharma Signed-off-by: Animesh Manna Signed-off-by: Jani Nikula Link: https://patchwork.freedesktop.org/patch/msgid/20190920115930.27829-7-animesh.manna@intel.com --- drivers/gpu/drm/i915/display/intel_dsb.c | 40 ++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_reg.h | 1 + 2 files changed, 41 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c index 6000050..6fb4529 100644 --- a/drivers/gpu/drm/i915/display/intel_dsb.c +++ b/drivers/gpu/drm/i915/display/intel_dsb.c @@ -26,6 +26,46 @@ 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 = container_of(dsb, typeof(*crtc), dsb); + 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 = container_of(dsb, typeof(*crtc), dsb); + 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) { diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index fba3e8b..5fcbaaa 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -11703,6 +11703,7 @@ 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_ */ -- 2.7.4