linux-kernel - Re: [PATCH RFC 1/5] drm/edid: Add support to get edid early

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Message-ID: <87614epd1g.fsf@intel.com>
Date:	Mon, 17 Aug 2015 10:52:27 +0300
From:	Jani Nikula <jani.nikula@...ux.intel.com>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Thierry Reding <thierry.reding@...il.com>,
	dri-devel@...ts.freedesktop.org
Cc:	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH RFC 1/5] drm/edid: Add support to get edid early

On Fri, 14 Aug 2015, Srinivas Kandagatla <srinivas.kandagatla@...aro.org> wrote:
> This patch adds support to get edid way early before the connector is
> created, this is mainly used for panel drivers to auto-probe the panel
> based on the vendor and product id from EDID.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  drivers/gpu/drm/drm_edid.c | 8 ++++++++
>  include/drm/drm_crtc.h     | 1 +
>  2 files changed, 9 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 7087da3..30359cd 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -1388,6 +1388,14 @@ struct edid *drm_get_edid(struct drm_connector *connector,
>  }
>  EXPORT_SYMBOL(drm_get_edid);
>  
> +struct edid *drm_get_edid_early(struct i2c_adapter *adapter)
> +{
> +	struct drm_connector dummy_connector;
> +
> +	return drm_get_edid(&dummy_connector, adapter);

This will oops the kernel on bad EDID.

BR,
Jani.

> +}
> +EXPORT_SYMBOL(drm_get_edid_early);
> +
>  /**
>   * drm_edid_duplicate - duplicate an EDID and the extensions
>   * @edid: EDID to duplicate
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 57ca8cc..35d8763 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -1330,6 +1330,7 @@ extern void drm_reinit_primary_mode_group(struct drm_device *dev);
>  extern bool drm_probe_ddc(struct i2c_adapter *adapter);
>  extern struct edid *drm_get_edid(struct drm_connector *connector,
>  				 struct i2c_adapter *adapter);
> +extern struct edid *drm_get_edid_early(struct i2c_adapter *adapter);
>  extern struct edid *drm_edid_duplicate(const struct edid *edid);
>  extern int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid);
>  extern void drm_mode_config_init(struct drm_device *dev);
> -- 
> 1.9.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Jani Nikula, Intel Open Source Technology Center
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