On Thu, 2020-07-02 at 18:37 +0300, Ville Syrjala wrote: > From: Ville Syrjälä <ville.syrj...@linux.intel.com> > > Normally i85x/i865 3D activity will block FBC until a 2D blit > occurs. I suppose this was meant to avoid recompression while > 3D activity is still going on but the frame hasn't yet been > presented. Unfortunately that also means that a page flipped > 3D workload will permanently block FBC even if it only renders > a single frame and then does nothing. > > Since we are using software render tracking anyway we might as > well flip the chicken bit so that 3D does not block FBC. This > will avoid the permament FBC blockage in the aforemention use > case, but thanks to the software tracking the compressor will > not disturb 3D rendering activity.
Register does what is described. Reviewed-by: José Roberto de Souza <jose.so...@intel.com> > > Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com> > --- > drivers/gpu/drm/i915/i915_reg.h | 1 + > drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++++ > 2 files changed, 11 insertions(+) > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index 9d6536afc94b..03590d2d75f7 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -2827,6 +2827,7 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg) > #define VLV_GU_CTL0 _MMIO(VLV_DISPLAY_BASE + 0x2030) > #define VLV_GU_CTL1 _MMIO(VLV_DISPLAY_BASE + 0x2034) > #define SCPD0 _MMIO(0x209c) /* 915+ only */ > +#define SCPD_FBC_IGNORE_3D (1 << 6) > #define CSTATE_RENDER_CLOCK_GATE_DISABLE (1 << 5) > #define GEN2_IER _MMIO(0x20a0) > #define GEN2_IIR _MMIO(0x20a4) > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c > index 565a2b9da3b3..2d980b83a1f1 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -7471,6 +7471,16 @@ static void i85x_init_clock_gating(struct > drm_i915_private *dev_priv) > > I915_WRITE(MEM_MODE, > _MASKED_BIT_ENABLE(MEM_DISPLAY_TRICKLE_FEED_DISABLE)); > + > + /* > + * Have FBC ignore 3D activity since we use software > + * render tracking, and otherwise a pure 3D workload > + * (even if it just renders a single frame and then does > + * abosultely nothing) would not allow FBC to recompress > + * until a 2D blit occurs. > + */ > + I915_WRITE(SCPD0, > + _MASKED_BIT_ENABLE(SCPD_FBC_IGNORE_3D)); > } > > static void i830_init_clock_gating(struct drm_i915_private *dev_priv) _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
