[Intel-gfx] [PATCH 1/2] drm/edid: Add and export function to parse manufacturer id

[Daniel Vetter]

On Wed, Nov 07, 2018 at 04:23:52PM -0800, José Roberto de Souza wrote:
> This function will be helpful to drivers that wants to add its own
> quirks to sinks.

Why would you want to do that? The point of a shared edid parsing code is
that we can share all these quirks ...

For these kind of patches, always include the driver code that makes use
of your new code too. That makes it much easier to answer these questions.

Thanks, Daniel


> 
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c | 20 ++++++++++++++++----
>  include/drm/drm_edid.h     |  1 +
>  2 files changed, 17 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index b506e3622b08..1a0ddf3d326b 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -1755,6 +1755,21 @@ EXPORT_SYMBOL(drm_edid_duplicate);
>  
>  /*** EDID parsing ***/
>  
> +/**
> + * drm_edid_manufacturer_parse - parse the EDID manufacturer id to readable
> + * characters and set into manufacturer parameter.
> + * @edid: EDID to get the manufacturer
> + * @manufacturer: the char buffer to store the id
> + */
> +void drm_edid_manufacturer_parse(const struct edid *edid, char manufacturer[3])
> +{
> +	manufacturer[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
> +	manufacturer[1] = (((edid->mfg_id[0] & 0x3) << 3) |
> +			  ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
> +	manufacturer[2] = (edid->mfg_id[1] & 0x1f) + '@';
> +}
> +EXPORT_SYMBOL(drm_edid_manufacturer_parse);
> +
>  /**
>   * edid_vendor - match a string against EDID's obfuscated vendor field
>   * @edid: EDID to match
> @@ -1766,10 +1781,7 @@ static bool edid_vendor(const struct edid *edid, const char *vendor)
>  {
>  	char edid_vendor[3];
>  
> -	edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
> -	edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
> -			  ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
> -	edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
> +	drm_edid_manufacturer_parse(edid, edid_vendor);
>  
>  	return !strncmp(edid_vendor, vendor, 3);
>  }
> diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> index e3c404833115..e4f3f7f34d6a 100644
> --- a/include/drm/drm_edid.h
> +++ b/include/drm/drm_edid.h
> @@ -466,6 +466,7 @@ struct edid *drm_get_edid_switcheroo(struct drm_connector *connector,
>  				     struct i2c_adapter *adapter);
>  struct edid *drm_edid_duplicate(const struct edid *edid);
>  int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid);
> +void drm_edid_manufacturer_parse(const struct edid *edid, char manufacturer[3]);
>  
>  u8 drm_match_cea_mode(const struct drm_display_mode *to_match);
>  enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code);
> -- 
> 2.19.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch