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There are at least two such > > quirks applicable to all drivers: the DPCD register access probe quirk > > and the 128b/132b DPRX Lane Count Conversion quirk (see 3.5.2.16.3 in > > the v2.1a DP Standard). The latter quirk applies to panels with specific > > EDID panel names, support for defining a quirk this way will be added as > > a follow-up. > > > > v2: Reset global_quirks in drm_reset_display_info(). > > v3: (Jani) > > - Use one list for both the global and internal quirks. > > - Drop change for panel name specific quirks. > > - Add comment about the way quirks should be queried. > > > > Cc: Ville Syrjälä > > Cc: Jani Nikula > > Signed-off-by: Imre Deak > > --- > > drivers/gpu/drm/drm_edid.c | 8 +++++++- > > include/drm/drm_connector.h | 4 +++- > > include/drm/drm_edid.h | 5 +++++ > > 3 files changed, 15 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > > index 857ae0c47a1c3..9cca1e6e4736c 100644 > > --- a/drivers/gpu/drm/drm_edid.c > > +++ b/drivers/gpu/drm/drm_edid.c > > @@ -68,7 +68,7 @@ static int oui(u8 first, u8 second, u8 third) > > > > enum drm_edid_internal_quirk { > > /* First detailed mode wrong, use largest 60Hz mode */ > > - EDID_QUIRK_PREFER_LARGE_60, > > + EDID_QUIRK_PREFER_LARGE_60 = DRM_EDID_QUIRK_NUM, > > /* Reported 135MHz pixel clock is too high, needs adjustment */ > > EDID_QUIRK_135_CLOCK_TOO_HIGH, > > /* Prefer the largest mode at 75 Hz */ > > @@ -2959,6 +2959,12 @@ static bool drm_edid_has_internal_quirk(struct drm_connector *connector, > > return connector->display_info.quirks & BIT(quirk); > > } > > > > +bool drm_edid_has_quirk(struct drm_connector *connector, enum drm_edid_quirk quirk) > > Nitpick, this could've been const. I'm unsure what rule to follow for atomic object pointers. Ville said once that unlike atomic state pointers (i.e. drm_connector_state for instance) these shouldn't be constified. Maybe that applies only to cases where the object pointer is passed on to another function (so not in this simple case clearly)? > Regardless, > > Reviewed-by: Jani Nikula > > > > > +{ > > + return connector->display_info.quirks & BIT(quirk); > > +} > > +EXPORT_SYMBOL(drm_edid_has_quirk); > > + > > #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) > > #define MODE_REFRESH_DIFF(c,t) (abs((c) - (t))) > > > > diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h > > index 73903c3c842f3..137773dd138ea 100644 > > --- a/include/drm/drm_connector.h > > +++ b/include/drm/drm_connector.h > > @@ -843,7 +843,9 @@ struct drm_display_info { > > int vics_len; > > > > /** > > - * @quirks: EDID based quirks. Internal to EDID parsing. > > + * @quirks: EDID based quirks. DRM core and drivers can query the > > + * @drm_edid_quirk quirks using drm_edid_has_quirk(), the rest of > > + * the quirks also tracked here are internal to EDID parsing. > > */ > > u32 quirks; > > > > diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h > > index b38409670868d..77fd42608e706 100644 > > --- a/include/drm/drm_edid.h > > +++ b/include/drm/drm_edid.h > > @@ -109,6 +109,10 @@ struct detailed_data_string { > > #define DRM_EDID_CVT_FLAGS_STANDARD_BLANKING (1 << 3) > > #define DRM_EDID_CVT_FLAGS_REDUCED_BLANKING (1 << 4) > > > > +enum drm_edid_quirk { > > + DRM_EDID_QUIRK_NUM, > > +}; > > + > > struct detailed_data_monitor_range { > > u8 min_vfreq; > > u8 max_vfreq; > > @@ -476,5 +480,6 @@ void drm_edid_print_product_id(struct drm_printer *p, > > u32 drm_edid_get_panel_id(const struct drm_edid *drm_edid); > > bool drm_edid_match(const struct drm_edid *drm_edid, > > const struct drm_edid_ident *ident); > > +bool drm_edid_has_quirk(struct drm_connector *connector, enum drm_edid_quirk quirk); > > > > #endif /* __DRM_EDID_H__ */ > > -- > Jani Nikula, Intel