On Wed, May 06, 2015 at 05:35:48PM +0530, Sonika Jindal wrote: > This provides an option to override the value set by VBT > for selecting edp Vswing Pre-emph setting table. > > v2: Adding comment about this being a temporary workaround and > making the parameter read-only (Jani) > v3: Changing mode to 0400 instead of 0 (Jani) > > https://bugs.freedesktop.org/show_bug.cgi?id=89554 > Signed-off-by: Sonika Jindal <sonika.jindal@xxxxxxxxx> > Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx> Queued for -next, thanks for the patch. -Daniel > --- > drivers/gpu/drm/i915/i915_drv.h | 4 +++- > drivers/gpu/drm/i915/i915_params.c | 8 ++++++++ > drivers/gpu/drm/i915/intel_bios.c | 9 +++++++-- > drivers/gpu/drm/i915/intel_ddi.c | 2 +- > drivers/gpu/drm/i915/intel_dp.c | 2 +- > 5 files changed, 20 insertions(+), 5 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h > index 136d42a..1c3ee66 100644 > --- a/drivers/gpu/drm/i915/i915_drv.h > +++ b/drivers/gpu/drm/i915/i915_drv.h > @@ -1364,7 +1364,6 @@ struct intel_vbt_data { > bool edp_initialized; > bool edp_support; > int edp_bpp; > - bool edp_low_vswing; > struct edp_power_seq edp_pps; > > struct { > @@ -1846,6 +1845,8 @@ struct drm_i915_private { > void (*stop_ring)(struct intel_engine_cs *ring); > } gt; > > + bool edp_low_vswing; > + > /* > * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch > * will be rejected. Instead look for a better place. > @@ -2515,6 +2516,7 @@ struct i915_params { > int mmio_debug; > bool verbose_state_checks; > bool nuclear_pageflip; > + int edp_vswing; > }; > extern struct i915_params i915 __read_mostly; > > diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c > index bb64415..8ac5a1b 100644 > --- a/drivers/gpu/drm/i915/i915_params.c > +++ b/drivers/gpu/drm/i915/i915_params.c > @@ -53,6 +53,7 @@ struct i915_params i915 __read_mostly = { > .mmio_debug = 0, > .verbose_state_checks = 1, > .nuclear_pageflip = 0, > + .edp_vswing = 0, > }; > > module_param_named(modeset, i915.modeset, int, 0400); > @@ -184,3 +185,10 @@ MODULE_PARM_DESC(verbose_state_checks, > module_param_named_unsafe(nuclear_pageflip, i915.nuclear_pageflip, bool, 0600); > MODULE_PARM_DESC(nuclear_pageflip, > "Force atomic modeset functionality; only planes work for now (default: false)."); > + > +/* WA to get away with the default setting in VBT for early platforms.Will be removed */ > +module_param_named_unsafe(edp_vswing, i915.edp_vswing, int, 0400); > +MODULE_PARM_DESC(edp_vswing, > + "Ignore/Override vswing pre-emph table selection from VBT " > + "(0=use value from vbt [default], 1=low power swing(200mV)," > + "2=default swing(400mV))"); > diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c > index c08368c..cee596d 100644 > --- a/drivers/gpu/drm/i915/intel_bios.c > +++ b/drivers/gpu/drm/i915/intel_bios.c > @@ -672,8 +672,13 @@ parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb) > if (bdb->version >= 173) { > uint8_t vswing; > > - vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF; > - dev_priv->vbt.edp_low_vswing = vswing == 0; > + /* Don't read from VBT if module parameter has valid value*/ > + if (i915.edp_vswing) { > + dev_priv->edp_low_vswing = i915.edp_vswing == 1; > + } else { > + vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF; > + dev_priv->edp_low_vswing = vswing == 0; > + } > } > } > > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c > index 9c1e74a..2539f22 100644 > --- a/drivers/gpu/drm/i915/intel_ddi.c > +++ b/drivers/gpu/drm/i915/intel_ddi.c > @@ -282,7 +282,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port, > ddi_translations_fdi = NULL; > ddi_translations_dp = skl_ddi_translations_dp; > n_dp_entries = ARRAY_SIZE(skl_ddi_translations_dp); > - if (dev_priv->vbt.edp_low_vswing) { > + if (dev_priv->edp_low_vswing) { > ddi_translations_edp = skl_ddi_translations_edp; > n_edp_entries = ARRAY_SIZE(skl_ddi_translations_edp); > } else { > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c > index bacdec5..5f53666 100644 > --- a/drivers/gpu/drm/i915/intel_dp.c > +++ b/drivers/gpu/drm/i915/intel_dp.c > @@ -2894,7 +2894,7 @@ intel_dp_voltage_max(struct intel_dp *intel_dp) > if (IS_BROXTON(dev)) > return DP_TRAIN_VOLTAGE_SWING_LEVEL_3; > else if (INTEL_INFO(dev)->gen >= 9) { > - if (dev_priv->vbt.edp_low_vswing && port == PORT_A) > + if (dev_priv->edp_low_vswing && port == PORT_A) > return DP_TRAIN_VOLTAGE_SWING_LEVEL_3; > return DP_TRAIN_VOLTAGE_SWING_LEVEL_2; > } else if (IS_VALLEYVIEW(dev)) > -- > 1.7.10.4 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
