Hi Daniel,
On 23-03-2017 07:22, Daniel Vetter wrote:
> On Wed, Mar 22, 2017 at 05:35:57PM +0000, Jose Abreu wrote:
>> We can't expect userspace to have full support for all HDMI 2.0+
>> features. Instead of expecting/waiting for userspace to support
>> the new features add a knob, much like the stereo knob, so that
>> DRM core will only expose the features when asked too.
>>
>> Signed-off-by: Jose Abreu <joabreu@xxxxxxxxxxxx>
>> Cc: Carlos Palminha <palminha@xxxxxxxxxxxx>
>> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
>> ---
>> drivers/gpu/drm/drm_ioctl.c | 5 +++++
>> include/drm/drm_file.h | 8 ++++++++
>> include/uapi/drm/drm.h | 7 +++++++
>> 3 files changed, 20 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
>> index a7c61c2..2430e2e 100644
>> --- a/drivers/gpu/drm/drm_ioctl.c
>> +++ b/drivers/gpu/drm/drm_ioctl.c
>> @@ -318,6 +318,11 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
>> file_priv->atomic = req->value;
>> file_priv->universal_planes = req->value;
>> break;
>> + case DRM_CLIENT_CAP_HDMI2:
>> + if (req->value > 1)
>> + return -EINVAL;
>> + file_priv->hdmi2_allowed = req->value;
> Needs some userspace to make use of this (like the -modesetting x.org
> driver).
> -Daniel
I see your point but shouldn't this be merged before actually
starting to work in userspace?
Best regards,
Jose Miguel Abreu
>
>> + break;
>> default:
>> return -EINVAL;
>> }
>> diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h
>> index 5dd27ae..7b97d85 100644
>> --- a/include/drm/drm_file.h
>> +++ b/include/drm/drm_file.h
>> @@ -192,6 +192,14 @@ struct drm_file {
>> unsigned is_master:1;
>>
>> /**
>> + * @hdmi2_allowed:
>> + *
>> + * True if client understands HDMI 2.0+ features like, for example,
>> + * extended aspect ratios
>> + */
>> + unsigned hdmi2_allowed:1;
>> +
>> + /**
>> * @master:
>> *
>> * Master this node is currently associated with. Only relevant if
>> diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
>> index b2c5284..9e25138 100644
>> --- a/include/uapi/drm/drm.h
>> +++ b/include/uapi/drm/drm.h
>> @@ -678,6 +678,13 @@ struct drm_get_cap {
>> */
>> #define DRM_CLIENT_CAP_ATOMIC 3
>>
>> +/**
>> + * DRM_CLIENT_CAP_HDMI2
>> + *
>> + * If set to 1, the DRM core will expose HDMI 2.0+ features to userspace
>> + */
>> +#define DRM_CLIENT_CAP_HDMI2 4
>> +
>> /** DRM_IOCTL_SET_CLIENT_CAP ioctl argument type */
>> struct drm_set_client_cap {
>> __u64 capability;
>> --
>> 1.9.1
>>
>>
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