From 03b7b5f983091bca17e9c163832fcde56971d7d1 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Wed, 18 May 2016 18:47:11 +0200 Subject: [PATCH] drm/i915/psr: Try to program link training times correctly MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The default of 0 is 500us of link training, but that's not enough for some platforms. Decoding this correctly means we're using 2.5ms of link training on these platforms, which fixes flickering issues associated with enabling PSR. v2: Unbotch the math a bit. v3: Drop debug hunk. v4: Improve commit message. Tested-by: Lyude Cc: Lyude Cc: stable@vger.kernel.org Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95176 Cc: Rodrigo Vivi Cc: Sonika Jindal Cc: Durgadoss R Cc: "Pandiyan, Dhinakaran" Tested-by: Ville Syrjälä Reviewed-by: Ville Syrjälä Tested-by: fritsch@kodi.tv Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1463590036-17824-2-git-send-email-daniel.vetter@ffwll.ch (cherry picked from commit 50db139018f9c94376d5f4db94a3bae65fdfac14) Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/intel_psr.c | 55 +++++++++++++++++++++++++++----- 1 file changed, 47 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c index c3abae4bc596..a788d1e9589b 100644 --- a/drivers/gpu/drm/i915/intel_psr.c +++ b/drivers/gpu/drm/i915/intel_psr.c @@ -280,7 +280,10 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp) * with the 5 or 6 idle patterns. */ uint32_t idle_frames = max(6, dev_priv->vbt.psr.idle_frames); - uint32_t val = 0x0; + uint32_t val = EDP_PSR_ENABLE; + + val |= max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT; + val |= idle_frames << EDP_PSR_IDLE_FRAME_SHIFT; if (IS_HASWELL(dev)) val |= EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES; @@ -288,14 +291,50 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp) if (dev_priv->psr.link_standby) val |= EDP_PSR_LINK_STANDBY; - I915_WRITE(EDP_PSR_CTL, val | - max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT | - idle_frames << EDP_PSR_IDLE_FRAME_SHIFT | - EDP_PSR_ENABLE); + if (dev_priv->vbt.psr.tp1_wakeup_time > 5) + val |= EDP_PSR_TP1_TIME_2500us; + else if (dev_priv->vbt.psr.tp1_wakeup_time > 1) + val |= EDP_PSR_TP1_TIME_500us; + else if (dev_priv->vbt.psr.tp1_wakeup_time > 0) + val |= EDP_PSR_TP1_TIME_100us; + else + val |= EDP_PSR_TP1_TIME_0us; + + if (dev_priv->vbt.psr.tp2_tp3_wakeup_time > 5) + val |= EDP_PSR_TP2_TP3_TIME_2500us; + else if (dev_priv->vbt.psr.tp2_tp3_wakeup_time > 1) + val |= EDP_PSR_TP2_TP3_TIME_500us; + else if (dev_priv->vbt.psr.tp2_tp3_wakeup_time > 0) + val |= EDP_PSR_TP2_TP3_TIME_100us; + else + val |= EDP_PSR_TP2_TP3_TIME_0us; + + if (intel_dp_source_supports_hbr2(intel_dp) && + drm_dp_tps3_supported(intel_dp->dpcd)) + val |= EDP_PSR_TP1_TP3_SEL; + else + val |= EDP_PSR_TP1_TP2_SEL; + + I915_WRITE(EDP_PSR_CTL, val); + + if (!dev_priv->psr.psr2_support) + return; + + /* FIXME: selective update is probably totally broken because it doesn't + * mesh at all with our frontbuffer tracking. And the hw alone isn't + * good enough. */ + val = EDP_PSR2_ENABLE | EDP_SU_TRACK_ENABLE; + + if (dev_priv->vbt.psr.tp2_tp3_wakeup_time > 5) + val |= EDP_PSR2_TP2_TIME_2500; + else if (dev_priv->vbt.psr.tp2_tp3_wakeup_time > 1) + val |= EDP_PSR2_TP2_TIME_500; + else if (dev_priv->vbt.psr.tp2_tp3_wakeup_time > 0) + val |= EDP_PSR2_TP2_TIME_100; + else + val |= EDP_PSR2_TP2_TIME_50; - if (dev_priv->psr.psr2_support) - I915_WRITE(EDP_PSR2_CTL, EDP_PSR2_ENABLE | - EDP_SU_TRACK_ENABLE | EDP_PSR2_TP2_TIME_100); + I915_WRITE(EDP_PSR2_CTL, val); } static bool intel_psr_match_conditions(struct intel_dp *intel_dp) -- 2.39.5