linux-kernel - Re: [PATCH drm/hisilicon 2/3] drm/hisilicon: Features to support reading resolutions from EDID

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Message-ID: <839cdb82-9611-6279-8ee7-38c92ede4460@suse.de>
Date:   Mon, 21 Sep 2020 09:25:19 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Tian Tao <tiantao6@...ilicon.com>, airlied@...ux.ie,
        daniel@...ll.ch, kraxel@...hat.com, alexander.deucher@....com,
        tglx@...utronix.de, dri-devel@...ts.freedesktop.org,
        xinliang.liu@...aro.org, linux-kernel@...r.kernel.org
Cc:     linuxarm@...wei.com
Subject: Re: [PATCH drm/hisilicon 2/3] drm/hisilicon: Features to support
 reading resolutions from EDID

Hi

Am 21.09.20 um 05:25 schrieb Tian Tao:
> Use drm_get_edid to get the resolution, if that fails, set it to
> a fixed resolution.
> 
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
> ---
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c | 35 ++++++++++++++++++++----
>  1 file changed, 29 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> index 376a05d..e84d381 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> @@ -20,13 +20,24 @@
>  
>  static int hibmc_connector_get_modes(struct drm_connector *connector)
>  {
> -	int count;
> +	int count = 0;
> +	void *edid;
> +	struct hibmc_connector *hibmc_connector = to_hibmc_connector(connector);
> +
> +	edid = drm_get_edid(connector, &hibmc_connector->adapter);
> +	if (edid) {
> +		drm_connector_update_edid_property(connector, edid);
> +		count = drm_add_edid_modes(connector, edid);

There's nothing wrong here, but i think it might be more readable if you do

  if (count)
    goto out;

within this branch. The out label would be just before the kfree. With
this change, the code with drm_add_modes_noedid() would remain the same.

> +	}
>  
> -	count = drm_add_modes_noedid(connector,
> +	if (!edid || count == 0) {
> +		count = drm_add_modes_noedid(connector,
>  				     connector->dev->mode_config.max_width,
>  				     connector->dev->mode_config.max_height);
> -	drm_set_preferred_mode(connector, 1024, 768);
> +		drm_set_preferred_mode(connector, 1024, 768);
> +	}
>  
> +	kfree(edid);
>  	return count;
>  }
>  
> @@ -77,10 +88,19 @@ static const struct drm_encoder_funcs hibmc_encoder_funcs = {
>  int hibmc_vdac_init(struct hibmc_drm_private *priv)
>  {
>  	struct drm_device *dev = priv->dev;
> +	struct hibmc_connector *hibmc_connector = &priv->connector;
>  	struct drm_encoder *encoder = &priv->encoder;
> -	struct drm_connector *connector = &priv->connector;
> +	struct drm_connector *connector = &hibmc_connector->base;
>  	int ret;
>  
> +	hibmc_connector->dev = dev;

As mentioned, this dev field should be removed.

> +
> +	ret = hibmc_ddc_create(hibmc_connector);
> +	if (ret) {
> +		drm_err(dev, "failed to create connector: %d\n", ret);

The error message appears to be incorrect. (?)

> +		return ret;
> +	}
> +
>  	encoder->possible_crtcs = 0x1;
>  	ret = drm_encoder_init(dev, encoder, &hibmc_encoder_funcs,
>  			       DRM_MODE_ENCODER_DAC, NULL);
> @@ -91,12 +111,15 @@ int hibmc_vdac_init(struct hibmc_drm_private *priv)
>  
>  	drm_encoder_helper_add(encoder, &hibmc_encoder_helper_funcs);
>  
> -	ret = drm_connector_init(dev, connector, &hibmc_connector_funcs,
> -				 DRM_MODE_CONNECTOR_VGA);
> +	ret = drm_connector_init_with_ddc(dev, connector,
> +					  &hibmc_connector_funcs,
> +					  DRM_MODE_CONNECTOR_VGA,
> +					  &hibmc_connector->adapter);
>  	if (ret) {
>  		drm_err(dev, "failed to init connector: %d\n", ret);
>  		return ret;
>  	}
> +
>  	drm_connector_helper_add(connector, &hibmc_connector_helper_funcs);
>  
>  	drm_connector_attach_encoder(connector, encoder);
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer



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