On Thu, Oct 24, 2019 at 12:31:06PM +0200, Thierry Reding wrote:
> On Wed, Oct 23, 2019 at 05:00:41PM -0700, Manasi Navare wrote:
> > Adaptive Sync is a VESA feature so add a DRM core helper to parse
> > the EDID's detailed descritors to obtain the adaptive sync monitor range.
> > Store this info as part fo drm_display_info so it can be used
> > across all drivers.
> > This part of the code is stripped out of amdgpu's function
> > amdgpu_dm_update_freesync_caps() to make it generic and be used
> > across all DRM drivers
> >
> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > Cc: Harry Wentland <harry.wentland@xxxxxxx>
> > Cc: Clinton A Taylor <clinton.a.taylor@xxxxxxxxx>
> > Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/drm_edid.c | 49 +++++++++++++++++++++++++++++++++++++
> > include/drm/drm_connector.h | 25 +++++++++++++++++++
> > include/drm/drm_edid.h | 2 ++
> > 3 files changed, 76 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> > index 474ac04d5600..97dd1200773e 100644
> > --- a/drivers/gpu/drm/drm_edid.c
> > +++ b/drivers/gpu/drm/drm_edid.c
> > @@ -4707,6 +4707,52 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
> > }
> > }
> >
> > +void drm_get_adaptive_sync_limits(struct drm_connector *connector,
> > + const struct edid *edid)
> > +{
> > + struct drm_display_info *info = &connector->display_info;
> > + const struct detailed_timing *timing;
> > + const struct detailed_non_pixel *data;
> > + const struct detailed_data_monitor_range *range;
> > + int i;
>
> This can be unsigned int.
Yes this can be unsigned, will change this
>
> > +
> > + /*
> > + * Restrict Adaptive Sync only for dp and edp
> > + */
> > + if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort &&
> > + connector->connector_type != DRM_MODE_CONNECTOR_eDP)
> > + return;
> > +
> > + if (edid->version <= 1 && !(edid->version == 1 && edid->revision > 1))
> > + return;
> > +
> > + for (i = 0; i < 4; i++) {
> > + timing = &edid->detailed_timings[i];
> > + data = &timing->data.other_data;
> > + range = &data->data.range;
> > + /*
> > + * Check if monitor has continuous frequency mode
> > + */
> > + if (data->type != EDID_DETAIL_MONITOR_RANGE)
> > + continue;
> > + /*
> > + * Check for flag range limits only. If flag == 1 then
> > + * no additional timing information provided.
> > + * Default GTF, GTF Secondary curve and CVT are not
> > + * supported
> > + */
> > + if (range->flags != 1)
> > + continue;
> > +
> > + info->adaptive_sync.min_vfreq = range->min_vfreq;
> > + info->adaptive_sync.max_vfreq = range->max_vfreq;
> > + info->adaptive_sync.pixel_clock_mhz =
> > + range->pixel_clock_mhz * 10;
> > + break;
> > + }
> > +}
> > +EXPORT_SYMBOL(drm_get_adaptive_sync_limits);
> > +
> > /* A connector has no EDID information, so we've got no EDID to compute quirks from. Reset
> > * all of the values which would have been set from EDID
> > */
> > @@ -4728,6 +4774,7 @@ drm_reset_display_info(struct drm_connector *connector)
> > memset(&info->hdmi, 0, sizeof(info->hdmi));
> >
> > info->non_desktop = 0;
> > + memset(&info->adaptive_sync, 0, sizeof(info->adaptive_sync));
> > }
> >
> > u32 drm_add_display_info(struct drm_connector *connector, const struct edid *edid)
> > @@ -4743,6 +4790,8 @@ u32 drm_add_display_info(struct drm_connector *connector, const struct edid *edi
> >
> > info->non_desktop = !!(quirks & EDID_QUIRK_NON_DESKTOP);
> >
> > + drm_get_adaptive_sync_limits(connector, edid);
> > +
> > DRM_DEBUG_KMS("non_desktop set to %d\n", info->non_desktop);
> >
> > if (edid->revision < 3)
> > diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> > index 5f8c3389d46f..a27a84270d8d 100644
> > --- a/include/drm/drm_connector.h
> > +++ b/include/drm/drm_connector.h
> > @@ -254,6 +254,26 @@ enum drm_panel_orientation {
> > DRM_MODE_PANEL_ORIENTATION_RIGHT_UP,
> > };
> >
> > +/**
> > + * struct drm_adaptive_sync_info - Panel's Adaptive Sync capabilities for
> > + * &drm_display_info
> > + *
> > + * This struct is used to store a Panel's Adaptive Sync capabilities
> > + * as parsed from EDID's detailed monitor range descriptor block.
> > + *
> > + * @min_vfreq: This is the min supported refresh rate in Hz from
> > + * EDID's detailed monitor range.
> > + * @max_vfreq: This is the max supported refresh rate in Hz from
> > + * EDID's detailed monitor range
> > + * @pixel_clock_mhz: This is the dotclock in MHz from
> > + * EDID's detailed monitor range
> > + */
> > +struct drm_adaptive_sync_info {
> > + int min_vfreq;
> > + int max_vfreq;
> > + int pixel_clock_mhz;
>
> Any reason why these can't be unsigned? Also, does it perhaps make sense
> to store the pixel clock as kHz like we do everywhere else?
>
Yes I could change these to unsigned as well, just kept is similar to the AMDGPU defs to begin with
Also the pixel clock in MHz is to align with the drm_edid.h in detailed_data_monitor_range
Regards
Manasi
> Thierry
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