linux-kernel - Re: [PATCH v5 10/10] drm: vc4: Use crtc->mode_valid() and encoder->mode

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Date:   Tue, 30 May 2017 09:30:19 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Jose Abreu <Jose.Abreu@...opsys.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Carlos Palminha <CARLOS.PALMINHA@...opsys.com>
Subject: Re: [PATCH v5 10/10] drm: vc4: Use crtc->mode_valid() and
 encoder->mode_valid() callbacks

On 05/25/2017 04:19 PM, Jose Abreu wrote:
> Now that we have a callback to check if crtc and encoder supports a
> given mode we can use it in vc4 so that we restrict the number of
> probbed modes to the ones we can actually display.
> 
> Also, remove the mode_fixup() calls as these are no longer needed
> because mode_valid() will be called before.
> 
> NOTE: Not even compiled tested
> 
> Signed-off-by: Jose Abreu <joabreu@...opsys.com>
> Cc: Carlos Palminha <palminha@...opsys.com>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Eric Anholt <eric@...olt.net>
> Cc: David Airlie <airlied@...ux.ie>
> ---
>  drivers/gpu/drm/vc4/vc4_crtc.c | 13 ++++++-------
>  drivers/gpu/drm/vc4/vc4_dpi.c  | 13 ++++++-------
>  2 files changed, 12 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index 1b4dbe9..20703c8 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -542,18 +542,17 @@ static void vc4_crtc_enable(struct drm_crtc *crtc)
>  	drm_crtc_vblank_on(crtc);
>  }
>  
> -static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,
> -				const struct drm_display_mode *mode,
> -				struct drm_display_mode *adjusted_mode)
> +static enum drm_mode_status vc4_crtc_mode_valid(struct drm_crtc *crtc,
> +						const struct drm_display_mode *mode)
>  {
>  	/* Do not allow doublescan modes from user space */
> -	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) {
> +	if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {
>  		DRM_DEBUG_KMS("[CRTC:%d] Doublescan mode rejected.\n",
>  			      crtc->base.id);
> -		return false;
> +		return MODE_NO_DBLESCAN;
>  	}
>  
> -	return true;
> +	return MODE_OK;
>  }
>  
>  static int vc4_crtc_atomic_check(struct drm_crtc *crtc,
> @@ -863,7 +862,7 @@ static void vc4_crtc_destroy_state(struct drm_crtc *crtc,
>  	.mode_set_nofb = vc4_crtc_mode_set_nofb,
>  	.disable = vc4_crtc_disable,
>  	.enable = vc4_crtc_enable,
> -	.mode_fixup = vc4_crtc_mode_fixup,
> +	.mode_valid = vc4_crtc_mode_valid,
>  	.atomic_check = vc4_crtc_atomic_check,
>  	.atomic_flush = vc4_crtc_atomic_flush,
>  };
> diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
> index c6d7039..61958ab 100644
> --- a/drivers/gpu/drm/vc4/vc4_dpi.c
> +++ b/drivers/gpu/drm/vc4/vc4_dpi.c
> @@ -330,20 +330,19 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
>  	}
>  }
>  
> -static bool vc4_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
> -				       const struct drm_display_mode *mode,
> -				       struct drm_display_mode *adjusted_mode)
> +static enum drm_mode_status vc4_dpi_encoder_mode_valid(struct drm_encoder *encoder,
> +						       const struct drm_display_mode *mode)
>  {
> -	if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
> -		return false;
> +	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> +		return MODE_NO_INTERLACE;
>  
> -	return true;
> +	return MODE_OK;
>  }
>  
>  static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = {
>  	.disable = vc4_dpi_encoder_disable,
>  	.enable = vc4_dpi_encoder_enable,
> -	.mode_fixup = vc4_dpi_encoder_mode_fixup,
> +	.mode_valid = vc4_dpi_encoder_mode_valid,
>  };
>  
>  static const struct of_device_id vc4_dpi_dt_match[] = {
> 

Reviewed-by: Neil Armstrong <narmstrong@...libre.com>