diff mbox series

[v3,02/16] drm/edid: Break out reading block 0 of the EDID

Message ID 20210901131531.v3.2.I62e76a034ac78c994d40a23cd4ec5aeee56fa77c@changeid (mailing list archive)
State New, archived
Headers show
Series eDP: Support probing eDP panels dynamically instead of hardcoding | expand

Commit Message

Doug Anderson Sept. 1, 2021, 8:19 p.m. UTC
A future change wants to be able to read just block 0 of the EDID, so
break it out of drm_do_get_edid() into a sub-function.

This is intended to be a no-op change--just code movement.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

(no changes since v1)

 drivers/gpu/drm/drm_edid.c | 62 +++++++++++++++++++++++++++-----------
 1 file changed, 44 insertions(+), 18 deletions(-)

Comments

Jani Nikula Sept. 6, 2021, 9:50 a.m. UTC | #1
On Wed, 01 Sep 2021, Douglas Anderson <dianders@chromium.org> wrote:
> A future change wants to be able to read just block 0 of the EDID, so
> break it out of drm_do_get_edid() into a sub-function.
>
> This is intended to be a no-op change--just code movement.
>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
>
> (no changes since v1)
>
>  drivers/gpu/drm/drm_edid.c | 62 +++++++++++++++++++++++++++-----------
>  1 file changed, 44 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 6325877c5fd6..a22c38482a90 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -1905,6 +1905,43 @@ int drm_add_override_edid_modes(struct drm_connector *connector)
>  }
>  EXPORT_SYMBOL(drm_add_override_edid_modes);
>  
> +static struct edid *drm_do_get_edid_blk0(

Maybe base_block instead of blk0?

> +	int (*get_edid_block)(void *data, u8 *buf, unsigned int block,
> +			      size_t len),
> +	void *data, bool *edid_corrupt, int *null_edid_counter)
> +{
> +	int i;
> +	u8 *edid;

With void *edid, this function wouldn't need the cast internally.

> +
> +	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
> +		return NULL;

Could split the allocation and NULL check to two separate lines per
coding style, while at it?

BR,
Jani.

> +
> +	/* base block fetch */
> +	for (i = 0; i < 4; i++) {
> +		if (get_edid_block(data, edid, 0, EDID_LENGTH))
> +			goto out;
> +		if (drm_edid_block_valid(edid, 0, false, edid_corrupt))
> +			break;
> +		if (i == 0 && drm_edid_is_zero(edid, EDID_LENGTH)) {
> +			if (null_edid_counter)
> +				(*null_edid_counter)++;
> +			goto carp;
> +		}
> +	}
> +	if (i == 4)
> +		goto carp;
> +
> +	return (struct edid *)edid;
> +
> +carp:
> +	kfree(edid);
> +	return ERR_PTR(-EINVAL);
> +
> +out:
> +	kfree(edid);
> +	return NULL;
> +}
> +
>  /**
>   * drm_do_get_edid - get EDID data using a custom EDID block read function
>   * @connector: connector we're probing
> @@ -1938,25 +1975,16 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
>  	if (override)
>  		return override;
>  
> -	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
> +	edid = (u8 *)drm_do_get_edid_blk0(get_edid_block, data,
> +					  &connector->edid_corrupt,
> +					  &connector->null_edid_counter);
> +	if (IS_ERR_OR_NULL(edid)) {
> +		if (IS_ERR(edid))
> +			connector_bad_edid(connector, edid, 1);
>  		return NULL;
> -
> -	/* base block fetch */
> -	for (i = 0; i < 4; i++) {
> -		if (get_edid_block(data, edid, 0, EDID_LENGTH))
> -			goto out;
> -		if (drm_edid_block_valid(edid, 0, false,
> -					 &connector->edid_corrupt))
> -			break;
> -		if (i == 0 && drm_edid_is_zero(edid, EDID_LENGTH)) {
> -			connector->null_edid_counter++;
> -			goto carp;
> -		}
>  	}
> -	if (i == 4)
> -		goto carp;
>  
> -	/* if there's no extensions, we're done */
> +	/* if there's no extensions or no connector, we're done */
>  	valid_extensions = edid[0x7e];
>  	if (valid_extensions == 0)
>  		return (struct edid *)edid;
> @@ -2010,8 +2038,6 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
>  
>  	return (struct edid *)edid;
>  
> -carp:
> -	connector_bad_edid(connector, edid, 1);
>  out:
>  	kfree(edid);
>  	return NULL;
diff mbox series

Patch

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 6325877c5fd6..a22c38482a90 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1905,6 +1905,43 @@  int drm_add_override_edid_modes(struct drm_connector *connector)
 }
 EXPORT_SYMBOL(drm_add_override_edid_modes);
 
+static struct edid *drm_do_get_edid_blk0(
+	int (*get_edid_block)(void *data, u8 *buf, unsigned int block,
+			      size_t len),
+	void *data, bool *edid_corrupt, int *null_edid_counter)
+{
+	int i;
+	u8 *edid;
+
+	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
+		return NULL;
+
+	/* base block fetch */
+	for (i = 0; i < 4; i++) {
+		if (get_edid_block(data, edid, 0, EDID_LENGTH))
+			goto out;
+		if (drm_edid_block_valid(edid, 0, false, edid_corrupt))
+			break;
+		if (i == 0 && drm_edid_is_zero(edid, EDID_LENGTH)) {
+			if (null_edid_counter)
+				(*null_edid_counter)++;
+			goto carp;
+		}
+	}
+	if (i == 4)
+		goto carp;
+
+	return (struct edid *)edid;
+
+carp:
+	kfree(edid);
+	return ERR_PTR(-EINVAL);
+
+out:
+	kfree(edid);
+	return NULL;
+}
+
 /**
  * drm_do_get_edid - get EDID data using a custom EDID block read function
  * @connector: connector we're probing
@@ -1938,25 +1975,16 @@  struct edid *drm_do_get_edid(struct drm_connector *connector,
 	if (override)
 		return override;
 
-	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
+	edid = (u8 *)drm_do_get_edid_blk0(get_edid_block, data,
+					  &connector->edid_corrupt,
+					  &connector->null_edid_counter);
+	if (IS_ERR_OR_NULL(edid)) {
+		if (IS_ERR(edid))
+			connector_bad_edid(connector, edid, 1);
 		return NULL;
-
-	/* base block fetch */
-	for (i = 0; i < 4; i++) {
-		if (get_edid_block(data, edid, 0, EDID_LENGTH))
-			goto out;
-		if (drm_edid_block_valid(edid, 0, false,
-					 &connector->edid_corrupt))
-			break;
-		if (i == 0 && drm_edid_is_zero(edid, EDID_LENGTH)) {
-			connector->null_edid_counter++;
-			goto carp;
-		}
 	}
-	if (i == 4)
-		goto carp;
 
-	/* if there's no extensions, we're done */
+	/* if there's no extensions or no connector, we're done */
 	valid_extensions = edid[0x7e];
 	if (valid_extensions == 0)
 		return (struct edid *)edid;
@@ -2010,8 +2038,6 @@  struct edid *drm_do_get_edid(struct drm_connector *connector,
 
 	return (struct edid *)edid;
 
-carp:
-	connector_bad_edid(connector, edid, 1);
 out:
 	kfree(edid);
 	return NULL;