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

Submitted by Souza, Jose on Nov. 8, 2018, 12:23 a.m.

Details

Message ID 20181108002353.19020-1-jose.souza@intel.com
State New
Headers show
Series "Series without cover letter" ( rev: 1 ) in DRI devel

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Commit Message

Souza, Jose Nov. 8, 2018, 12:23 a.m.
This function will be helpful to drivers that wants to add its own
quirks to sinks.

Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/drm_edid.c | 20 ++++++++++++++++----
 include/drm/drm_edid.h     |  1 +
 2 files changed, 17 insertions(+), 4 deletions(-)

Patch hide | download patch | download mbox

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);

Comments

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@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
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
On Thu, 2018-11-08 at 09:31 +0100, Daniel Vetter wrote:
> 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.

This will be used to disable or enable with quirks PSR in some panels
that do not behave like eDP spec states.
As this would be specifc to i915, I guess is better keep the list only
in i915.

What is your opinion about that?

> 
> Thanks, Daniel
> 
> 
> > Signed-off-by: José Roberto de Souza <jose.souza@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
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
On Thu, Nov 08, 2018 at 08:42:52PM +0000, Souza, Jose wrote:
> On Thu, 2018-11-08 at 09:31 +0100, Daniel Vetter wrote:
> > 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.
> 
> This will be used to disable or enable with quirks PSR in some panels
> that do not behave like eDP spec states.
> As this would be specifc to i915, I guess is better keep the list only
> in i915.
> 
> What is your opinion about that?

For anything dp, shouldn't we use the OUI instead? Or is that more garbage
than the EDID serial?

And yes, psr quirking for i915 seems like a reasonable thing to do, using
either approach. But definitely include the full picture, including i915
patches, in your next round.
-Daniel

> 
> > 
> > Thanks, Daniel
> > 
> > 
> > > Signed-off-by: José Roberto de Souza <jose.souza@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
> > > 
> > > _______________________________________________
> > > Intel-gfx mailing list
> > > Intel-gfx@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
On Thu, 08 Nov 2018, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Thu, Nov 08, 2018 at 08:42:52PM +0000, Souza, Jose wrote:
>> On Thu, 2018-11-08 at 09:31 +0100, Daniel Vetter wrote:
>> > 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.
>> 
>> This will be used to disable or enable with quirks PSR in some panels
>> that do not behave like eDP spec states.
>> As this would be specifc to i915, I guess is better keep the list only
>> in i915.
>> 
>> What is your opinion about that?
>
> For anything dp, shouldn't we use the OUI instead? Or is that more garbage
> than the EDID serial?

The OUI isn't always present, but we can use it when it is. And we
already have DPCD quirk support for that in drm_dp_helper.c.

> And yes, psr quirking for i915 seems like a reasonable thing to do, using
> either approach. But definitely include the full picture, including i915
> patches, in your next round.

I think all of the quirk matching should be in drm core or helpers. For
most quirks, it's up to the drivers to actually do something with that
information anyway, so it'll still remain i915 specific.

BR,
Jani.




> -Daniel
>
>> 
>> > 
>> > Thanks, Daniel
>> > 
>> > 
>> > > Signed-off-by: José Roberto de Souza <jose.souza@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
>> > > 
>> > > _______________________________________________
>> > > Intel-gfx mailing list
>> > > Intel-gfx@lists.freedesktop.org
>> > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
On Tue, 2018-11-13 at 22:07 +0200, Jani Nikula wrote:
> On Thu, 08 Nov 2018, Daniel Vetter <daniel@ffwll.ch> wrote:
> > On Thu, Nov 08, 2018 at 08:42:52PM +0000, Souza, Jose wrote:
> > > On Thu, 2018-11-08 at 09:31 +0100, Daniel Vetter wrote:
> > > > 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.
> > > 
> > > This will be used to disable or enable with quirks PSR in some
> > > panels
> > > that do not behave like eDP spec states.
> > > As this would be specifc to i915, I guess is better keep the list
> > > only
> > > in i915.
> > > 
> > > What is your opinion about that?
> > 
> > For anything dp, shouldn't we use the OUI instead? Or is that more
> > garbage
> > than the EDID serial?
> 
> The OUI isn't always present, but we can use it when it is. And we
> already have DPCD quirk support for that in drm_dp_helper.c.

I was not aware about OUI, thanks.

OUI is a requirement in DP 1.2+ and PSR was added in DP 1.3, so I can
safely use it.

> 
> > And yes, psr quirking for i915 seems like a reasonable thing to do,
> > using
> > either approach. But definitely include the full picture, including
> > i915
> > patches, in your next round.
> 
> I think all of the quirk matching should be in drm core or helpers.
> For
> most quirks, it's up to the drivers to actually do something with
> that
> information anyway, so it'll still remain i915 specific.

The edid quirks are returned from drm_add_display_info() and it is used
only to updated some connector parameters in drm_add_edid_modes().

Also the use that we have right now is blacklist all panels from a
vendor that have its own proprietary PSR-like implementation, so that
use would not fit in the current drm quirk list.

So for now I can use the OUI to check if the panel vendor match and if
so not enable PSR.

> 
> BR,
> Jani.
> 
> 
> 
> 
> > -Daniel
> > 
> > > > Thanks, Daniel
> > > > 
> > > > 
> > > > > Signed-off-by: José Roberto de Souza <jose.souza@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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> > > > > Intel-gfx@lists.freedesktop.org
> > > > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx