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| author | Simon Ser <contact@emersion.fr> | 2020-10-22 13:34:44 +0300 |
|---|---|---|
| committer | Simon Ser <contact@emersion.fr> | 2020-10-22 14:49:14 +0300 |
| commit | 12767469edfad756491e4a95e86934b5c89b9685 (patch) | |
| tree | b663babb5a44f06e01649395db22cf13322cfc14 /drivers/gpu/drm/drm_connector.c | |
| parent | 6a6e5988a2657cd0c91f6f1a3e7d194599248b6d (diff) | |
| download | linux-12767469edfad756491e4a95e86934b5c89b9685.tar.xz | |
drm: document that user-space should avoid parsing EDIDs
User-space should avoid parsing EDIDs for metadata already exposed via
other KMS interfaces and properties. For instance, user-space should not
try to extract a list of modes from the EDID: the kernel might mutate
the mode list (because of link capabilities or quirks for instance).
Other metadata not exposed by KMS can be parsed by user-space. This
includes for instance monitor identification (make/model/serial) and
supported color-spaces.
v2: add short explanation why user-space shouldn't do this (Brian)
Signed-off-by: Simon Ser <contact@emersion.fr>
Suggested-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Brian Starkey <brian.starkey@arm.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/V_APW3gKRhljvcmT28tGV3JkP7qW9Z7h45I-s2wiJvYhaaveCpYpg3tztZPsZVV2KV1NC7rUx08IUUgCJXzdRrWCsEGB0czq4ZozpdyVFLs=@emersion.fr
Diffstat (limited to 'drivers/gpu/drm/drm_connector.c')
| -rw-r--r-- | drivers/gpu/drm/drm_connector.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index 717c4e7271b0..1913d8b4e16a 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -960,6 +960,11 @@ static const struct drm_prop_enum_list dp_colorspaces[] = { * drm_connector_update_edid_property(), usually after having parsed * the EDID using drm_add_edid_modes(). Userspace cannot change this * property. + * + * User-space should not parse the EDID to obtain information exposed via + * other KMS properties (because the kernel might apply limits, quirks or + * fixups to the EDID). For instance, user-space should not try to parse + * mode lists from the EDID. * DPMS: * Legacy property for setting the power state of the connector. For atomic * drivers this is only provided for backwards compatibility with existing |