From 0047eedc48869f8c7797dd10f0cf976ac34c1d33 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 10 Jul 2015 10:56:24 +0300 Subject: [PATCH] drm/i915: Force common lane on for the PPS kick on CHV MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit With DPIO powergating active the DPLL can't be accessed unless something else is keeping the common lane in the channel on. That means the PPS kick procedure could fail to enable the PLL. Power up some data lanes to force the common lane to power up so that the PLL can be enabled temporarily. v2: Avoid gcc uninitilized variable warning Signed-off-by: Ville Syrjälä Reviewed-by: Deepak S Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_dp.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index b032eef8aeb8..ea114690ffd4 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -341,7 +341,9 @@ vlv_power_sequencer_kick(struct intel_dp *intel_dp) struct drm_device *dev = intel_dig_port->base.base.dev; struct drm_i915_private *dev_priv = dev->dev_private; enum pipe pipe = intel_dp->pps_pipe; - bool pll_enabled; + bool pll_enabled, release_cl_override = false; + enum dpio_phy phy = DPIO_PHY(pipe); + enum dpio_channel ch = vlv_pipe_to_channel(pipe); uint32_t DP; if (WARN(I915_READ(intel_dp->output_reg) & DP_PORT_EN, @@ -371,9 +373,13 @@ vlv_power_sequencer_kick(struct intel_dp *intel_dp) * The DPLL for the pipe must be enabled for this to work. * So enable temporarily it if it's not already enabled. */ - if (!pll_enabled) + if (!pll_enabled) { + release_cl_override = IS_CHERRYVIEW(dev) && + !chv_phy_powergate_ch(dev_priv, phy, ch, true); + vlv_force_pll_on(dev, pipe, IS_CHERRYVIEW(dev) ? &chv_dpll[0].dpll : &vlv_dpll[0].dpll); + } /* * Similar magic as in intel_dp_enable_port(). @@ -390,8 +396,12 @@ vlv_power_sequencer_kick(struct intel_dp *intel_dp) I915_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN); POSTING_READ(intel_dp->output_reg); - if (!pll_enabled) + if (!pll_enabled) { vlv_force_pll_off(dev, pipe); + + if (release_cl_override) + chv_phy_powergate_ch(dev_priv, phy, ch, false); + } } static enum pipe -- 2.20.1