> -----Original Message----- > From: Mun, Gwan-gyeong <[email protected]> > Sent: Tuesday, February 23, 2021 3:00 AM > To: [email protected] > Cc: Gupta, Anshuman <[email protected]>; Souza, Jose > <[email protected]> > Subject: [PATCH v3] drm/i915/display: Do not allow DC3CO if PSR SF is enabled > > Even though GEN12+ HW supports PSR + DC3CO, DMC's HW DC3CO exit > mechanism has an issue with using of Selective Fecth and PSR2 manual tracking. > And as some GEN12+ platforms (RKL, ADL-S) don't support PSR2 HW tracking, > Selective Fetch will be enabled by default on that platforms. > Therefore if the system enables PSR Selective Fetch / PSR manual tracking, it > does not allow DC3CO dc state, in that case. > > When this DC3CO exit issue is addressed while PSR Selective Fetch is enabled, > this restriction should be removed. > > v2: Address Jose's review comment. > - Fix typo > - Move check routine of DC3CO ability to > tgl_dc3co_exitline_compute_config() > v3: Change the check routine of enablement of psr2 sel fetch. (Jose) > > Cc: José Roberto de Souza <[email protected]> > Cc: Anshuman Gupta <[email protected]> > Signed-off-by: Gwan-gyeong Mun <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_psr.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c > b/drivers/gpu/drm/i915/display/intel_psr.c > index 7c6e561f86c1..cd434285e3b7 100644 > --- a/drivers/gpu/drm/i915/display/intel_psr.c > +++ b/drivers/gpu/drm/i915/display/intel_psr.c > @@ -654,6 +654,13 @@ tgl_dc3co_exitline_compute_config(struct intel_dp > *intel_dp, > struct drm_i915_private *dev_priv = dp_to_i915(intel_dp); > u32 exit_scanlines; > > + /* > + * DMC's DC3CO exit mechanism has an issue with Selective Fecth > + * TODO: when the issue is addressed, this restriction should be > removed. > + */ Earlier when PSR2 H/W tracking was enabled, DC3CO exit and frame updates works on it's own Supported by DE engine and DMC firmware, but with selective fetch enable as it disables the PSR2 H/W Tracking. It requires to get sequence of DC3CO exit while PSR2 H/W tracking disabled. Br, Anshuman Gupta. > + if (crtc_state->enable_psr2_sel_fetch) > + return; > + > if (!(dev_priv->csr.allowed_dc_mask & DC_STATE_EN_DC3CO)) > return; > > -- > 2.30.0
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