[PATCH 1/2] drm/edid: new drm_edid_block_checksum helper function

[PATCH 1/2] drm/edid: new drm_edid_block_checksum helper function

[Stefan Brüns]

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
---
 drivers/gpu/drm/drm_edid.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 0755d01..505960e 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1184,6 +1184,17 @@ static bool drm_edid_is_zero(u8 *in_edid, int length)
 	return true;
 }
 
+static u8
+drm_edid_block_checksum(u8 *raw_edid)
+{
+	int i;
+	u8 csum = 0;
+	for (i = 0; i < EDID_LENGTH; i++)
+		csum += raw_edid[i];
+
+	return csum;
+}
+
 static u8 *
 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
 {
-- 
1.8.4.5

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Re: [PATCH 1/2] drm/edid: new drm_edid_block_checksum helper function

[Jani Nikula]

On Sun, 16 Nov 2014, Stefan Brüns <stefan.bruens@rwth-aachen.de> wrote:

This needs a rationale for its existence here.

You could also use the function in drm_edid_block_valid to not duplicate
the code.

BR,
Jani.

> Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
> ---
>  drivers/gpu/drm/drm_edid.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 0755d01..505960e 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -1184,6 +1184,17 @@ static bool drm_edid_is_zero(u8 *in_edid, int length)
>  	return true;
>  }
>  
> +static u8
> +drm_edid_block_checksum(u8 *raw_edid)
> +{
> +	int i;
> +	u8 csum = 0;
> +	for (i = 0; i < EDID_LENGTH; i++)
> +		csum += raw_edid[i];
> +
> +	return csum;
> +}
> +
>  static u8 *
>  drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
>  {
> -- 
> 1.8.4.5
>
> _______________________________________________
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> dri-devel@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Jani Nikula, Intel Open Source Technology Center
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