[PATCH v2] drm/dp: Add function to parse EDID descriptors for adaptive sync limits
Manasi Navare
manasi.d.navare at intel.com
Wed Jan 15 00:00:10 UTC 2020
On Tue, Jan 14, 2020 at 03:07:56PM +0200, Ville Syrjälä wrote:
> On Mon, Jan 13, 2020 at 04:39:00PM -0800, Manasi Navare wrote:
> > Hi Ville,
> >
> > So the two major changes you would like to see here are:
> >
> > use version_greate(edid) function
> > and make use of :
> > drm_for_each_detailed_block() instead of the for loop.
> > But this function does not parse the monitor range yet so
> > you are suggesting modifying that dmr helper function as well?
>
> That functions is just the thing that iterates the descriptors, so
> can't figure out what you're asking.
My question was on your review comment below where you asked me to use
for_each_detailed_block(), were you referring to using the existing drm_for_each_detailed_block
or just defining a new iterator for looping through 4 detailed blocks to get the
monitor range?
Manasi
>
> >
> > Manasi
> >
> > On Fri, Jan 10, 2020 at 03:17:43PM -0800, Manasi Navare wrote:
> > > On Thu, Jan 09, 2020 at 03:08:52PM +0200, Ville Syrjälä wrote:
> > > > On Tue, Jan 07, 2020 at 04:32:08PM -0800, 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
> > > > >
> > > > > v2:
> > > > > * Change vmin and vmax to use u8 (Ville)
> > > > > * Dont store pixel clock since that is just a max dotclock
> > > > > and not related to VRR mode (Manasi)
> > > > >
> > > > > Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > > > > Cc: Harry Wentland <harry.wentland at amd.com>
> > > > > Cc: Clinton A Taylor <clinton.a.taylor at intel.com>
> > > > > Cc: Nicholas Kazlauskas <nicholas.kazluaskas at amd.com>
> > > > > Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
> > > > > ---
> > > > > drivers/gpu/drm/drm_edid.c | 51 +++++++++++++++++++++++++++++++++++++
> > > > > include/drm/drm_connector.h | 22 ++++++++++++++++
> > > > > include/drm/drm_edid.h | 2 ++
> > > > > 3 files changed, 75 insertions(+)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> > > > > index 99769d6c9f84..52781a0e708b 100644
> > > > > --- a/drivers/gpu/drm/drm_edid.c
> > > > > +++ b/drivers/gpu/drm/drm_edid.c
> > > > > @@ -4880,6 +4880,54 @@ 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;
> > > >
> > > > Needlessly wide scope for everything above.
> > >
> > > Okay will move inside the for_each loop ?
> > >
> > > >
> > > > > + int i;
> > > > > +
> > > > > + /*
> > > > > + * 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;
> > > >
> > > > if (!version_greater(...))
> > > > return;
> > >
> > > You mean simplify the condition or use define a function version_greater() to check this condition?
> > >
> > > >
> > > > > +
> > > > > + for (i = 0; i < 4; i++) {
> > > >
> > > > This should probably use for_each_detailed_block()
> > > >
> > >
> > >
> > > Ok yes will use for_each_detailed_block
> > >
> > > Manasi
> > >
> > >
> > > > > + 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;
> > > > > +
> > > > > + DRM_DEBUG_KMS("Adaptive Sync refresh rate range is %d Hz - %d Hz\n",
> > > > > + info->adaptive_sync.min_vfreq,
> > > > > + info->adaptive_sync.max_vfreq);
> > > > > + 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
> > > > > */
> > > > > @@ -4901,6 +4949,7 @@ 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)
> > > > > @@ -4916,6 +4965,8 @@ 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 221910948b37..77df404a2e01 100644
> > > > > --- a/include/drm/drm_connector.h
> > > > > +++ b/include/drm/drm_connector.h
> > > > > @@ -254,6 +254,23 @@ 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
> > > > > + */
> > > > > +struct drm_adaptive_sync_info {
> > > > > + u8 min_vfreq;
> > > > > + u8 max_vfreq;
> > > > > +};
> > > > > +
> > > > > /*
> > > > > * This is a consolidated colorimetry list supported by HDMI and
> > > > > * DP protocol standard. The respective connectors will register
> > > > > @@ -465,6 +482,11 @@ struct drm_display_info {
> > > > > * @non_desktop: Non desktop display (HMD).
> > > > > */
> > > > > bool non_desktop;
> > > > > +
> > > > > + /**
> > > > > + * @adaptive_sync: Adaptive Sync capabilities of the DP/eDP sink
> > > > > + */
> > > > > + struct drm_adaptive_sync_info adaptive_sync;
> > > > > };
> > > > >
> > > > > int drm_display_info_set_bus_formats(struct drm_display_info *info,
> > > > > diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> > > > > index f0b03d401c27..b9a230aa3e69 100644
> > > > > --- a/include/drm/drm_edid.h
> > > > > +++ b/include/drm/drm_edid.h
> > > > > @@ -503,4 +503,6 @@ void drm_edid_get_monitor_name(struct edid *edid, char *name,
> > > > > struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
> > > > > int hsize, int vsize, int fresh,
> > > > > bool rb);
> > > > > +void drm_get_adaptive_sync_limits(struct drm_connector *connector,
> > > > > + const struct edid *edid);
> > > > > #endif /* __DRM_EDID_H__ */
> > > > > --
> > > > > 2.19.1
> > > >
> > > > --
> > > > Ville Syrjälä
> > > > Intel
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel at lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
> --
> Ville Syrjälä
> Intel
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