>-----Original Message----- >From: Intel-gfx [mailto:[email protected]] On Behalf Of >Rodrigo Vivi >Sent: Saturday, February 28, 2015 6:56 AM >To: [email protected] >Cc: Vivi, Rodrigo >Subject: [Intel-gfx] [PATCH 3/7] drm/i915: PSR: deprecate link_standby support >for core platforms. > >On Haswell and Broadwell with link in standby when exit event happens >between vblank and VSC packet, PSR exit on panel but DPA transmitter >still sends black pixel. hen this condition hits, panel will intermittently
s/hen/when >display black frame. > >The known W/A for this case involve the of single_frame update >that isn't supported on Haswell and to be supported on Broadwell >3 other workarounds would be required. So it is better and safe to >just deprecate link_standby for now. > >Also, link fully off saves more power than link_standby and afwk >no OEM is requesting link standby on VBT. There is no reason for that. > >For Skylake let's just consider it behaves like Broadwell until >we prove otherwise. > Reviewed-by: Durgadoss R <[email protected]> Thanks, Durga >Reference: HSD: bdwgfx/1912559 >Signed-off-by: Rodrigo Vivi <[email protected]> >--- > drivers/gpu/drm/i915/i915_debugfs.c | 3 --- > drivers/gpu/drm/i915/i915_drv.h | 1 - > drivers/gpu/drm/i915/intel_psr.c | 25 ++++++++----------------- > 3 files changed, 8 insertions(+), 21 deletions(-) > >diff --git a/drivers/gpu/drm/i915/i915_debugfs.c >b/drivers/gpu/drm/i915/i915_debugfs.c >index 94b3984..756bf4e 100644 >--- a/drivers/gpu/drm/i915/i915_debugfs.c >+++ b/drivers/gpu/drm/i915/i915_debugfs.c >@@ -2281,9 +2281,6 @@ static int i915_edp_psr_status(struct seq_file *m, void >*data) > } > seq_puts(m, "\n"); > >- seq_printf(m, "Link standby: %s\n", >- yesno((bool)dev_priv->psr.link_standby)); >- > /* CHV PSR has no kind of performance counter */ > if (HAS_PSR(dev) && HAS_DDI(dev)) { > psrperf = I915_READ(EDP_PSR_PERF_CNT(dev)) & >diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h >index a1dd8bc..dfd044f 100644 >--- a/drivers/gpu/drm/i915/i915_drv.h >+++ b/drivers/gpu/drm/i915/i915_drv.h >@@ -863,7 +863,6 @@ struct i915_psr { > bool active; > struct delayed_work work; > unsigned busy_frontbuffer_bits; >- bool link_standby; > }; > > enum intel_pch { >diff --git a/drivers/gpu/drm/i915/intel_psr.c >b/drivers/gpu/drm/i915/intel_psr.c >index 6c8e9e0..d2ff87d 100644 >--- a/drivers/gpu/drm/i915/intel_psr.c >+++ b/drivers/gpu/drm/i915/intel_psr.c >@@ -157,14 +157,6 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp) > > aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0); > >- /* Enable PSR in sink */ >- if (dev_priv->psr.link_standby) >- drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, >- DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE); >- else >- drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, >- DP_PSR_ENABLE & ~DP_PSR_MAIN_LINK_ACTIVE); >- > aux_data_reg = (INTEL_INFO(dev)->gen >= 9) ? > DPA_AUX_CH_DATA1 : EDP_PSR_AUX_DATA1(dev); > aux_ctl_reg = (INTEL_INFO(dev)->gen >= 9) ? >@@ -193,6 +185,8 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp) > (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) | > (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT)); > } >+ >+ drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, DP_PSR_ENABLE); > } > > static void vlv_psr_enable_source(struct intel_dp *intel_dp) >@@ -242,9 +236,6 @@ static void hsw_psr_enable_source(struct intel_dp >*intel_dp) > uint32_t val = 0x0; > const uint32_t link_entry_time = EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES; > >- if (dev_priv->psr.link_standby) >- val |= EDP_PSR_LINK_STANDBY; >- > if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT) { > val |= EDP_PSR_TP2_TP3_TIME_0us; > val |= EDP_PSR_TP1_TIME_0us; >@@ -295,6 +286,12 @@ static bool intel_psr_match_conditions(struct intel_dp >*intel_dp) > return false; > } > >+ if (!IS_VALLEYVIEW(dev) && ((dev_priv->vbt.psr.full_link) || >+ (dig_port->port != PORT_A))){ >+ DRM_DEBUG_KMS("PSR condition failed: Link Standby >requested/needed but not >supported on this platform\n"); >+ return false; >+ } >+ > dev_priv->psr.source_ok = true; > return true; > } >@@ -353,12 +350,6 @@ void intel_psr_enable(struct intel_dp *intel_dp) > if (!intel_psr_match_conditions(intel_dp)) > goto unlock; > >- /* First we check VBT, but we must respect sink and source >- * known restrictions */ >- dev_priv->psr.link_standby = dev_priv->vbt.psr.full_link; >- if (IS_BROADWELL(dev) && intel_dig_port->port != PORT_A) >- dev_priv->psr.link_standby = true; >- > dev_priv->psr.busy_frontbuffer_bits = 0; > > if (HAS_DDI(dev)) { >-- >1.9.3 > >_______________________________________________ >Intel-gfx mailing list >[email protected] >http://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
