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authorManasi Navare <manasi.d.navare@intel.com>2020-03-11 02:16:51 +0300
committerManasi Navare <manasi.d.navare@intel.com>2020-03-11 23:13:00 +0300
commita1d11d1efe4d18b5f9db54ed62a44d05ce67f531 (patch)
tree5fceb0cd121772964109530bce10ed7048458faa /drivers/gpu/drm/drm_edid.c
parentf1ce98766496a4681107c39e603ae2494e717dd7 (diff)
downloadlinux-a1d11d1efe4d18b5f9db54ed62a44d05ce67f531.tar.xz
drm/edid: Add function to parse EDID descriptors for monitor range
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 v6: * Call it monitor_range (Ville) v5: * Use the renamed flags v4: * Use is_display_descriptor() (Ville) * Name the monitor range flags (Ville) v3: * Remove the edid parsing restriction for just DP (Nicholas) * Use drm_for_each_detailed_block (Ville) * Make the drm_get_adaptive_sync_range function static (Harry, Jani) 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@linux.intel.com> Cc: Harry Wentland <harry.wentland@amd.com> Cc: Clinton A Taylor <clinton.a.taylor@intel.com> Cc: Kazlauskas Nicholas <Nicholas.Kazlauskas@amd.com> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com> Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200310231651.13841-2-manasi.d.navare@intel.com
Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
-rw-r--r--drivers/gpu/drm/drm_edid.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index ad41764a4ebe..b269cd7f7679 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4938,6 +4938,47 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
}
}
+static
+void get_monitor_range(struct detailed_timing *timing,
+ void *info_monitor_range)
+{
+ struct drm_monitor_range_info *monitor_range = info_monitor_range;
+ const struct detailed_non_pixel *data = &timing->data.other_data;
+ const struct detailed_data_monitor_range *range = &data->data.range;
+
+ if (!is_display_descriptor((const u8 *)timing, EDID_DETAIL_MONITOR_RANGE))
+ return;
+
+ /*
+ * 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 != DRM_EDID_RANGE_LIMITS_ONLY_FLAG)
+ return;
+
+ monitor_range->min_vfreq = range->min_vfreq;
+ monitor_range->max_vfreq = range->max_vfreq;
+}
+
+static
+void drm_get_monitor_range(struct drm_connector *connector,
+ const struct edid *edid)
+{
+ struct drm_display_info *info = &connector->display_info;
+
+ if (!version_greater(edid, 1, 1))
+ return;
+
+ drm_for_each_detailed_block((u8 *)edid, get_monitor_range,
+ &info->monitor_range);
+
+ DRM_DEBUG_KMS("Supported Monitor Refresh rate range is %d Hz - %d Hz\n",
+ info->monitor_range.min_vfreq,
+ info->monitor_range.max_vfreq);
+}
+
/* 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
*/
@@ -4960,6 +5001,7 @@ drm_reset_display_info(struct drm_connector *connector)
memset(&info->hdmi, 0, sizeof(info->hdmi));
info->non_desktop = 0;
+ memset(&info->monitor_range, 0, sizeof(info->monitor_range));
}
u32 drm_add_display_info(struct drm_connector *connector, const struct edid *edid)
@@ -4975,6 +5017,8 @@ u32 drm_add_display_info(struct drm_connector *connector, const struct edid *edi
info->non_desktop = !!(quirks & EDID_QUIRK_NON_DESKTOP);
+ drm_get_monitor_range(connector, edid);
+
DRM_DEBUG_KMS("non_desktop set to %d\n", info->non_desktop);
if (edid->revision < 3)