On Wed, Jun 03, 2020 at 02:15:27PM -0700, Matt Roper wrote: > If HTI (also sometimes called HDPORT) is enabled at startup, it may be
whatis HTI? > using some of the PHYs and DPLLs making them unavailable for general > usage. Let's read out the HDPORT_STATE register and avoid making use of > resources that HTI is already using. > > v2: > - Fix minor checkpatch warnings > > Bspec: 49189 > Bspec: 53707 > Cc: Lucas De Marchi <[email protected]> > Signed-off-by: Matt Roper <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_display.c | 30 ++++++++++++++++--- > drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 21 +++++++++++++ > drivers/gpu/drm/i915/display/intel_dpll_mgr.h | 1 + > drivers/gpu/drm/i915/i915_drv.h | 3 ++ > drivers/gpu/drm/i915/i915_reg.h | 6 ++++ > 5 files changed, 57 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c > b/drivers/gpu/drm/i915/display/intel_display.c > index bcc6dc4e321b..cdd84a419cf7 100644 > --- a/drivers/gpu/drm/i915/display/intel_display.c > +++ b/drivers/gpu/drm/i915/display/intel_display.c > @@ -46,6 +46,7 @@ > #include "display/intel_ddi.h" > #include "display/intel_dp.h" > #include "display/intel_dp_mst.h" > +#include "display/intel_dpll_mgr.h" > #include "display/intel_dsi.h" > #include "display/intel_dvo.h" > #include "display/intel_gmbus.h" > @@ -16817,6 +16818,13 @@ static void intel_pps_init(struct drm_i915_private > *dev_priv) > intel_pps_unlock_regs_wa(dev_priv); > } > > +static bool hti_uses_phy(u32 hdport_state, enum phy phy) > +{ > + return hdport_state & HDPORT_ENABLED && > + (hdport_state & HDPORT_PHY_USED_DP(phy) || > + hdport_state & HDPORT_PHY_USED_HDMI(phy)); > +} > + > static void intel_setup_outputs(struct drm_i915_private *dev_priv) > { > struct intel_encoder *encoder; > @@ -16828,10 +16836,22 @@ static void intel_setup_outputs(struct > drm_i915_private *dev_priv) > return; > > if (IS_ROCKETLAKE(dev_priv)) { > - intel_ddi_init(dev_priv, PORT_A); > - intel_ddi_init(dev_priv, PORT_B); > - intel_ddi_init(dev_priv, PORT_D); /* DDI TC1 */ > - intel_ddi_init(dev_priv, PORT_E); /* DDI TC2 */ > + /* > + * If HTI (aka HDPORT) is enabled at boot, it may have taken > + * over some of the PHYs and made them unavailable to the > + * driver. In that case we should skip initializing the > + * corresponding outputs. > + */ > + u32 hdport_state = intel_de_read(dev_priv, HDPORT_STATE); > + > + if (!hti_uses_phy(hdport_state, PHY_A)) > + intel_ddi_init(dev_priv, PORT_A); > + if (!hti_uses_phy(hdport_state, PHY_B)) > + intel_ddi_init(dev_priv, PORT_B); > + if (!hti_uses_phy(hdport_state, PHY_C)) > + intel_ddi_init(dev_priv, PORT_D); /* DDI TC1 */ > + if (!hti_uses_phy(hdport_state, PHY_D)) > + intel_ddi_init(dev_priv, PORT_E); /* DDI TC2 */ > } else if (INTEL_GEN(dev_priv) >= 12) { > intel_ddi_init(dev_priv, PORT_A); > intel_ddi_init(dev_priv, PORT_B); > @@ -18379,6 +18399,8 @@ static void intel_modeset_readout_hw_state(struct > drm_device *dev) > > intel_dpll_readout_hw_state(dev_priv); > > + dev_priv->hti_pll_mask = intel_get_hti_plls(dev_priv); > + > for_each_intel_encoder(dev, encoder) { > pipe = 0; > > diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c > b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c > index b5f4d4cef682..6f59f9ec453b 100644 > --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c > +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c > @@ -265,6 +265,24 @@ void intel_disable_shared_dpll(const struct > intel_crtc_state *crtc_state) > mutex_unlock(&dev_priv->dpll.lock); > } > > +/* > + * HTI (aka HDPORT) may be using some of the platform's PLL's, making them > + * unavailable for use. > + */ > +u32 intel_get_hti_plls(struct drm_i915_private *dev_priv) > +{ > + u32 hdport_state; > + > + if (!IS_ROCKETLAKE(dev_priv)) > + return 0; > + > + hdport_state = intel_de_read(dev_priv, HDPORT_STATE); > + if (!(hdport_state & HDPORT_ENABLED)) > + return 0; > + > + return REG_FIELD_GET(HDPORT_DPLL_USED_MASK, hdport_state); > +} > + > static struct intel_shared_dpll * > intel_find_shared_dpll(struct intel_atomic_state *state, > const struct intel_crtc *crtc, > @@ -280,6 +298,9 @@ intel_find_shared_dpll(struct intel_atomic_state *state, > > drm_WARN_ON(&dev_priv->drm, dpll_mask & ~(BIT(I915_NUM_PLLS) - 1)); > > + /* Eliminate DPLLs from consideration if reserved by HTI */ > + dpll_mask &= ~dev_priv->hti_pll_mask; > + > for_each_set_bit(i, &dpll_mask, I915_NUM_PLLS) { > pll = &dev_priv->dpll.shared_dplls[i]; > > diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h > b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h > index 5d9a2bc371e7..ac2238646fe7 100644 > --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h > +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h > @@ -390,6 +390,7 @@ void intel_shared_dpll_swap_state(struct > intel_atomic_state *state); > void intel_shared_dpll_init(struct drm_device *dev); > void intel_dpll_readout_hw_state(struct drm_i915_private *dev_priv); > void intel_dpll_sanitize_state(struct drm_i915_private *dev_priv); > +u32 intel_get_hti_plls(struct drm_i915_private *dev_priv); > > void intel_dpll_dump_hw_state(struct drm_i915_private *dev_priv, > const struct intel_dpll_hw_state *hw_state); > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h > index e99255e17eb7..668b3c9cf3ae 100644 > --- a/drivers/gpu/drm/i915/i915_drv.h > +++ b/drivers/gpu/drm/i915/i915_drv.h > @@ -1037,6 +1037,9 @@ struct drm_i915_private { > > struct intel_l3_parity l3_parity; > > + /* Mask of PLLs reserved for use by HTI and unavailable to driver. */ > + u32 hti_pll_mask; > + > /* > * edram size in MB. > * Cannot be determined by PCIID. You must always read a register. > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index 85137d268c4a..b9faf0f978cf 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -2906,6 +2906,12 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg) > #define MBUS_BBOX_CTL_S1 _MMIO(0x45040) > #define MBUS_BBOX_CTL_S2 _MMIO(0x45044) > > +#define HDPORT_STATE _MMIO(0x45050) > +#define HDPORT_DPLL_USED_MASK REG_GENMASK(14, 12) > +#define HDPORT_PHY_USED_DP(phy) REG_BIT(2*(phy) + 2) > +#define HDPORT_PHY_USED_HDMI(phy) REG_BIT(2*(phy) + 1) > +#define HDPORT_ENABLED REG_BIT(0) > + > /* Make render/texture TLB fetches lower priorty than associated data > * fetches. This is not turned on by default > */ > -- > 2.24.1 > > _______________________________________________ > Intel-gfx mailing list > [email protected] > https://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Ville Syrjälä Intel _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
