Date:   Tue, 29 Nov 2016 21:14:10 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] drm: Add TV connector states to drm_connector_state

On Tue, Nov 29, 2016 at 10:41:58AM -0800, Eric Anholt wrote:
> From: Boris Brezillon <boris.brezillon@...e-electrons.com>
> 
> Some generic TV connector properties are exposed in drm_mode_config, but
> they are currently handled independently in each DRM encoder driver.
> 
> Extend the drm_connector_state to store TV related states, and modify the
> drm_atomic_connector_{set,get}_property() helpers to fill the connector
> state accordingly.
> 
> Each driver is then responsible for checking and applying the new config
> in its ->atomic_mode_{check,set}() operations.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
>  drivers/gpu/drm/drm_atomic.c | 50 ++++++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_connector.h  | 32 ++++++++++++++++++++++++++++
>  2 files changed, 82 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 23739609427d..02b0668f51e1 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -986,12 +986,38 @@ int drm_atomic_connector_set_property(struct drm_connector *connector,
>  		 * now?) atomic writes to DPMS property:
>  		 */
>  		return -EINVAL;
> +	} else if (property == config->tv_select_subconnector_property) {
> +		state->tv.subconnector = val;
> +	} else if (property == config->tv_left_margin_property) {
> +		state->tv.margins.left = val;
> +	} else if (property == config->tv_right_margin_property) {
> +		state->tv.margins.right = val;
> +	} else if (property == config->tv_top_margin_property) {
> +		state->tv.margins.bottom = val;

s/bottom/top/

> +	} else if (property == config->tv_bottom_margin_property) {
> +		state->tv.margins.right = val;

s/right/bottom/

> +	} else if (property == config->tv_mode_property) {
> +		state->tv.mode = val;
> +	} else if (property == config->tv_brightness_property) {
> +		state->tv.brightness = val;
> +	} else if (property == config->tv_contrast_property) {
> +		state->tv.contrast = val;
> +	} else if (property == config->tv_flicker_reduction_property) {
> +		state->tv.flicker_reduction = val;
> +	} else if (property == config->tv_overscan_property) {
> +		state->tv.overscan = val;
> +	} else if (property == config->tv_saturation_property) {
> +		state->tv.saturation = val;
> +	} else if (property == config->tv_hue_property) {
> +		state->tv.hue = val;
>  	} else if (connector->funcs->atomic_set_property) {
>  		return connector->funcs->atomic_set_property(connector,
>  				state, property, val);
>  	} else {
>  		return -EINVAL;
>  	}
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL(drm_atomic_connector_set_property);
>  
> @@ -1022,6 +1048,30 @@ drm_atomic_connector_get_property(struct drm_connector *connector,
>  		*val = (state->crtc) ? state->crtc->base.id : 0;
>  	} else if (property == config->dpms_property) {
>  		*val = connector->dpms;
> +	} else if (property == config->tv_select_subconnector_property) {
> +		*val = state->tv.subconnector;
> +	} else if (property == config->tv_left_margin_property) {
> +		*val = state->tv.margins.left;
> +	} else if (property == config->tv_right_margin_property) {
> +		*val = state->tv.margins.right;
> +	} else if (property == config->tv_top_margin_property) {
> +		*val = state->tv.margins.bottom;

s/bottom/top/
> +	} else if (property == config->tv_bottom_margin_property) {
> +		*val = state->tv.margins.right;

s/right/bottom/

> +	} else if (property == config->tv_mode_property) {
> +		*val = state->tv.mode;
> +	} else if (property == config->tv_brightness_property) {
> +		*val = state->tv.brightness;
> +	} else if (property == config->tv_contrast_property) {
> +		*val = state->tv.contrast;
> +	} else if (property == config->tv_flicker_reduction_property) {
> +		*val = state->tv.flicker_reduction;
> +	} else if (property == config->tv_overscan_property) {
> +		*val = state->tv.overscan;
> +	} else if (property == config->tv_saturation_property) {
> +		*val = state->tv.saturation;
> +	} else if (property == config->tv_hue_property) {
> +		*val = state->tv.hue;
>  	} else if (connector->funcs->atomic_get_property) {
>  		return connector->funcs->atomic_get_property(connector,
>  				state, property, val);
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index ac9d7d8e0e43..2382d44e5fff 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -194,10 +194,40 @@ int drm_display_info_set_bus_formats(struct drm_display_info *info,
>  				     unsigned int num_formats);
>  
>  /**
> + * struct drm_tv_connector_state - TV connector related states
> + * @subconnector: selected subconnector
> + * @margins: left/right/top/bottom margins
> + * @mode: TV mode
> + * @brightness: brightness in percent
> + * @contrast: contrast in percent
> + * @flicker_reduction: flicker reduction in percent
> + * @overscan: overscan in percent
> + * @saturation: saturation in percent
> + * @hue: hue in percent
> + */
> +struct drm_tv_connector_state {
> +	int subconnector;

I think an explicit enum for the possible values would be nice. Slightly
annoying/fragile since it needs to match the uabi ones, but we I think
there's a slight preference to explicit enums internally.

> +	struct {
> +		int left;
> +		int right;
> +		int top;
> +		int bottom;
> +	} margins;
> +	int mode;
> +	int brightness;
> +	int contrast;
> +	int flicker_reduction;
> +	int overscan;
> +	int saturation;
> +	int hue;

All the above properties are unsigned when exposed to userspace. I think
for consistency would be good to make them match on the kernel side too.

With the above issues addressed:

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

And since no one else seems to work on an atomic TV encoder feel free to
just stash into the next vc4 pull request.
-Daniel

> +};
> +
> +/**
>   * struct drm_connector_state - mutable connector state
>   * @connector: backpointer to the connector
>   * @best_encoder: can be used by helpers and drivers to select the encoder
>   * @state: backpointer to global drm_atomic_state
> + * @tv: TV connector state
>   */
>  struct drm_connector_state {
>  	struct drm_connector *connector;
> @@ -213,6 +243,8 @@ struct drm_connector_state {
>  	struct drm_encoder *best_encoder;
>  
>  	struct drm_atomic_state *state;
> +
> +	struct drm_tv_connector_state tv;
>  };
>  
>  /**
> -- 
> 2.10.2
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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