On Fri, Oct 09, 2020 at 09:24:01AM +0000, Simon Ser wrote:
> 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.
>
> Signed-off-by: Simon Ser <cont...@emersion.fr>
> Suggested-by: Daniel Vetter <daniel.vet...@intel.com>
> Cc: Daniel Vetter <daniel.vet...@intel.com>
> Cc: Pekka Paalanen <pekka.paala...@collabora.co.uk>
> Cc: Ville Syrj�l� <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/drm_connector.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 717c4e7271b0..00e58fd2d292 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -960,6 +960,10 @@ 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. For instance, user-space should not try to parse
> + * mode lists from the EDID.
I assume that this is so that the kernel can apply quirks/limits in
cases where it knows it needs to? I think it would be nice to put at
least a few words indicating "why", otherwise this feels like an
arbitrary commandment with no justification.
Cheers,
-Brian
> * DPMS:
> * Legacy property for setting the power state of the connector. For atomic
> * drivers this is only provided for backwards compatibility with existing
> --
> 2.28.0
>
>
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