linux-kernel - Re: [PATCH v3 2/6] drm: Add drm_{crtc/encoder/connector}_mode

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Date:   Mon, 15 May 2017 10:27:46 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Jose Abreu <Jose.Abreu@...opsys.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Dave Airlie <airlied@...ux.ie>,
        Archit Taneja <architt@...eaurora.org>
Subject: Re: [PATCH v3 2/6] drm: Add drm_{crtc/encoder/connector}_mode_valid()

On 11.05.2017 11:05, Jose Abreu wrote:
> Add a new helper to call crtc->mode_valid, connector->mode_valid
> and encoder->mode_valid callbacks.
>
> Suggested-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Signed-off-by: Jose Abreu <joabreu@...opsys.com>
> Cc: Carlos Palminha <palminha@...opsys.com>
> Cc: Alexey Brodkin <abrodkin@...opsys.com>
> Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Dave Airlie <airlied@...ux.ie>
> Cc: Andrzej Hajda <a.hajda@...sung.com>
> Cc: Archit Taneja <architt@...eaurora.org>
> ---
> Changes v2->v3:
> 	- Move helpers to drm_probe_helper.c (Daniel)
> 	- Squeeze patches that introduce the helpers into a single
> 	one (Daniel)
>
>  drivers/gpu/drm/drm_crtc_helper_internal.h | 13 ++++++++++
>  drivers/gpu/drm/drm_probe_helper.c         | 38 ++++++++++++++++++++++++++++++
>  2 files changed, 51 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_crtc_helper_internal.h b/drivers/gpu/drm/drm_crtc_helper_internal.h
> index 28295e5..97dfe20 100644
> --- a/drivers/gpu/drm/drm_crtc_helper_internal.h
> +++ b/drivers/gpu/drm/drm_crtc_helper_internal.h
> @@ -26,7 +26,11 @@
>   * implementation details and are not exported to drivers.
>   */
>  
> +#include <drm/drm_connector.h>
> +#include <drm/drm_crtc.h>
>  #include <drm/drm_dp_helper.h>
> +#include <drm/drm_encoder.h>
> +#include <drm/drm_modes.h>
>  
>  /* drm_fb_helper.c */
>  #ifdef CONFIG_DRM_FBDEV_EMULATION
> @@ -62,4 +66,13 @@ static inline int drm_dp_aux_register_devnode(struct drm_dp_aux *aux)
>  static inline void drm_dp_aux_unregister_devnode(struct drm_dp_aux *aux)
>  {
>  }
> +
> +/* drm_probe_helper.c */
> +enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc,
> +					 const struct drm_display_mode *mode);
> +enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder,
> +					    const struct drm_display_mode *mode);
> +enum drm_mode_status drm_connector_mode_valid(struct drm_connector *connector,
> +					      struct drm_display_mode *mode);
> +
>  #endif
> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> index 1b0c14a..f01abdc 100644
> --- a/drivers/gpu/drm/drm_probe_helper.c
> +++ b/drivers/gpu/drm/drm_probe_helper.c
> @@ -38,6 +38,9 @@
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_edid.h>
> +#include <drm/drm_modeset_helper_vtables.h>
> +
> +#include "drm_crtc_helper_internal.h"
>  
>  /**
>   * DOC: output probing helper overview
> @@ -113,6 +116,41 @@ static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
>  	return 1;
>  }
>  
> +enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc,
> +					 const struct drm_display_mode *mode)
> +{
> +	const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
> +
> +	if (!crtc_funcs || !crtc_funcs->mode_valid)
> +		return MODE_OK;
> +
> +	return crtc_funcs->mode_valid(crtc, mode);
> +}
> +
> +enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder,
> +					    const struct drm_display_mode *mode)
> +{
> +	const struct drm_encoder_helper_funcs *encoder_funcs =
> +		encoder->helper_private;
> +
> +	if (!encoder_funcs || !encoder_funcs->mode_valid)
> +		return MODE_OK;
> +
> +	return encoder_funcs->mode_valid(encoder, mode);
> +}
> +
> +enum drm_mode_status drm_connector_mode_valid(struct drm_connector *connector,
> +					      struct drm_display_mode *mode)
> +{
> +	const struct drm_connector_helper_funcs *connector_funcs =
> +		connector->helper_private;
> +
> +	if (!connector_funcs || !connector_funcs->mode_valid)
> +		return MODE_OK;
> +
> +	return connector_funcs->mode_valid(connector, mode);
> +}
> +

"Copy/Paste" as the main generic programming technique in C :)
I guess clever/scary macro wouldn't be an option.

Anyway:
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>

 --
Regards
Andrzej

>  #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
>  /**
>   * drm_kms_helper_poll_enable - re-enable output polling.