On Tue, Oct 22, 2019 at 09:56:43PM +0300, Ville Syrjala wrote: > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > The change to skip the PCH reference initialization during fastboot > did end up breaking FDI. To fix that let's try to do the PCH reference > init whenever we're disabling a DPLL that was using said reference > previously. > > Cc: stable@xxxxxxxxxxxxxxx > Tested-by: Andrija <akijo97@xxxxxxxxx> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=112084 > Fixes: b16c7ed95caf ("drm/i915: Do not touch the PCH SSC reference if a PLL is using it") > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx> > --- > drivers/gpu/drm/i915/display/intel_display.c | 11 ++++++----- > drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 15 +++++++++++++++ > drivers/gpu/drm/i915/i915_drv.h | 2 ++ > 3 files changed, 23 insertions(+), 5 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c > index 236fdf122e47..da76f794a965 100644 > --- a/drivers/gpu/drm/i915/display/intel_display.c > +++ b/drivers/gpu/drm/i915/display/intel_display.c > @@ -9359,7 +9359,6 @@ static bool wrpll_uses_pch_ssc(struct drm_i915_private *dev_priv, > static void lpt_init_pch_refclk(struct drm_i915_private *dev_priv) > { > struct intel_encoder *encoder; > - bool pch_ssc_in_use = false; > bool has_fdi = false; > > for_each_intel_encoder(&dev_priv->drm, encoder) { > @@ -9387,22 +9386,24 @@ static void lpt_init_pch_refclk(struct drm_i915_private *dev_priv) > * clock hierarchy. That would also allow us to do > * clock bending finally. > */ > + dev_priv->pch_ssc_use = 0; > + > if (spll_uses_pch_ssc(dev_priv)) { > DRM_DEBUG_KMS("SPLL using PCH SSC\n"); > - pch_ssc_in_use = true; > + dev_priv->pch_ssc_use |= BIT(DPLL_ID_SPLL); > } > > if (wrpll_uses_pch_ssc(dev_priv, DPLL_ID_WRPLL1)) { > DRM_DEBUG_KMS("WRPLL1 using PCH SSC\n"); > - pch_ssc_in_use = true; > + dev_priv->pch_ssc_use |= BIT(DPLL_ID_WRPLL1); > } > > if (wrpll_uses_pch_ssc(dev_priv, DPLL_ID_WRPLL2)) { > DRM_DEBUG_KMS("WRPLL2 using PCH SSC\n"); > - pch_ssc_in_use = true; > + dev_priv->pch_ssc_use |= BIT(DPLL_ID_WRPLL2); > } > > - if (pch_ssc_in_use) > + if (dev_priv->pch_ssc_use) > return; > > if (has_fdi) { > diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c > index ec10fa7d3c69..3ce0a023eee0 100644 > --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c > +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c > @@ -526,16 +526,31 @@ static void hsw_ddi_wrpll_disable(struct drm_i915_private *dev_priv, > val = I915_READ(WRPLL_CTL(id)); > I915_WRITE(WRPLL_CTL(id), val & ~WRPLL_PLL_ENABLE); > POSTING_READ(WRPLL_CTL(id)); > + > + /* > + * Try to set up the PCH reference clock once all DPLLs > + * that depend on it have been shut down. > + */ > + if (dev_priv->pch_ssc_use & BIT(id)) > + intel_init_pch_refclk(dev_priv); > } > > static void hsw_ddi_spll_disable(struct drm_i915_private *dev_priv, > struct intel_shared_dpll *pll) > { > + enum intel_dpll_id id = pll->info->id; > u32 val; > > val = I915_READ(SPLL_CTL); > I915_WRITE(SPLL_CTL, val & ~SPLL_PLL_ENABLE); > POSTING_READ(SPLL_CTL); > + > + /* > + * Try to set up the PCH reference clock once all DPLLs > + * that depend on it have been shut down. > + */ > + if (dev_priv->pch_ssc_use & BIT(id)) > + intel_init_pch_refclk(dev_priv); > } > > static bool hsw_ddi_wrpll_get_hw_state(struct drm_i915_private *dev_priv, > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h > index 8882c0908c3b..5332825e0ce4 100644 > --- a/drivers/gpu/drm/i915/i915_drv.h > +++ b/drivers/gpu/drm/i915/i915_drv.h > @@ -1348,6 +1348,8 @@ struct drm_i915_private { > } contexts; > } gem; > > + u8 pch_ssc_use; > + > /* For i915gm/i945gm vblank irq workaround */ > u8 vblank_enabled; > > -- > 2.21.0 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
