[PATCH 0/3] drm: handle override/firmware edid at the lowest level

[PATCH 0/3] drm: handle override/firmware edid at the lowest level

[Jani Nikula]

This is a simplified version of the perhaps too ambitious RFC [1].

Here we simply handle debugfs override edid and the firmware edid at the
drm_do_get_edid() level, not at the probe helper level. With this, everything
from EDID gets transparently overridden.

BR,
Jani.


[1] http://mid.mail-archive.com/cover.1482854862.git.jani.nikula@intel.com


Jani Nikula (3):
  drm: move edid property update and add modes out of edid firmware
    loader
  drm: reset ELD if NULL edid is passed to drm_edid_to_eld
  drm: handle override edid and firmware EDID at drm_do_get_edid() level

 drivers/gpu/drm/drm_edid.c         | 18 ++++++++++++++++++
 drivers/gpu/drm/drm_edid_load.c    | 17 ++++-------------
 drivers/gpu/drm/drm_probe_helper.c | 13 +------------
 include/drm/drm_edid.h             |  7 ++++---
 4 files changed, 27 insertions(+), 28 deletions(-)

-- 
2.1.4

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[PATCH 1/3] drm: move edid property update and add modes out of edid firmware loader

[Jani Nikula]

Make the firmware loader more generic and generally useful.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/drm_edid_load.c    | 17 ++++-------------
 drivers/gpu/drm/drm_probe_helper.c |  8 +++++++-
 include/drm/drm_edid.h             |  7 ++++---
 3 files changed, 15 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
index 622f788bff46..1c0495acf341 100644
--- a/drivers/gpu/drm/drm_edid_load.c
+++ b/drivers/gpu/drm/drm_edid_load.c
@@ -256,15 +256,14 @@ static void *edid_load(struct drm_connector *connector, const char *name,
 	return edid;
 }
 
-int drm_load_edid_firmware(struct drm_connector *connector)
+struct edid *drm_load_edid_firmware(struct drm_connector *connector)
 {
 	const char *connector_name = connector->name;
 	char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL;
-	int ret;
 	struct edid *edid;
 
 	if (edid_firmware[0] == '\0')
-		return 0;
+		return ERR_PTR(-ENOENT);
 
 	/*
 	 * If there are multiple edid files specified and separated
@@ -293,7 +292,7 @@ int drm_load_edid_firmware(struct drm_connector *connector)
 	if (!edidname) {
 		if (!fallback) {
 			kfree(fwstr);
-			return 0;
+			return ERR_PTR(-ENOENT);
 		}
 		edidname = fallback;
 	}
@@ -305,13 +304,5 @@ int drm_load_edid_firmware(struct drm_connector *connector)
 	edid = edid_load(connector, edidname, connector_name);
 	kfree(fwstr);
 
-	if (IS_ERR_OR_NULL(edid))
-		return 0;
-
-	drm_mode_connector_update_edid_property(connector, edid);
-	ret = drm_add_edid_modes(connector, edid);
-	drm_edid_to_eld(connector, edid);
-	kfree(edid);
-
-	return ret;
+	return edid;
 }
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 93381454bdf7..358957118ca9 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -311,7 +311,13 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 		count = drm_add_edid_modes(connector, edid);
 		drm_edid_to_eld(connector, edid);
 	} else {
-		count = drm_load_edid_firmware(connector);
+		struct edid *edid = drm_load_edid_firmware(connector);
+		if (!IS_ERR_OR_NULL(edid)) {
+			drm_mode_connector_update_edid_property(connector, edid);
+			count = drm_add_edid_modes(connector, edid);
+			drm_edid_to_eld(connector, edid);
+			kfree(edid);
+		}
 		if (count == 0)
 			count = (*connector_funcs->get_modes)(connector);
 	}
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 43fb0ac5eb9c..a55eea4afb61 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -331,11 +331,12 @@ int drm_av_sync_delay(struct drm_connector *connector,
 		      const struct drm_display_mode *mode);
 
 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
-int drm_load_edid_firmware(struct drm_connector *connector);
+struct edid *drm_load_edid_firmware(struct drm_connector *connector);
 #else
-static inline int drm_load_edid_firmware(struct drm_connector *connector)
+static inline struct edid *
+drm_load_edid_firmware(struct drm_connector *connector)
 {
-	return 0;
+	return ERR_PTR(-ENOENT);
 }
 #endif
 
-- 
2.1.4

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[PATCH 2/3] drm: reset ELD if NULL edid is passed to drm_edid_to_eld

[Jani Nikula]

Make the function useful for resetting, not just setting, the ELD.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/drm_edid.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 24e7b282f16c..362036360724 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3430,6 +3430,9 @@ void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
 
 	memset(eld, 0, sizeof(connector->eld));
 
+	if (!edid)
+		return;
+
 	connector->latency_present[0] = false;
 	connector->latency_present[1] = false;
 	connector->video_latency[0] = 0;
-- 
2.1.4

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[PATCH 3/3] drm: handle override edid and firmware adid at drm_do_get_edid()

[Jani Nikula]

Handle override edid and firmware edid at the low level to transparently
and completely replace the real edid. This also prevents actual edid
reads for them, but retains ddc probe.

FIXME: validate override edid, deduplicate firmware edid validation.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/drm_edid.c         | 15 +++++++++++++++
 drivers/gpu/drm/drm_probe_helper.c | 19 +------------------
 2 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 362036360724..054e2d74eafc 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1309,6 +1309,10 @@ static void connector_bad_edid(struct drm_connector *connector,
  * level, drivers must make all reasonable efforts to expose it as an I2C
  * adapter and use drm_get_edid() instead of abusing this function.
  *
+ * The EDID may be overridden using debugfs override_edid or firmare EDID
+ * (drm_load_edid_firmware()), in this priority order. Having either of them
+ * bypasses actual EDID reads.
+ *
  * Return: Pointer to valid EDID or NULL if we couldn't find any.
  */
 struct edid *drm_do_get_edid(struct drm_connector *connector,
@@ -1318,6 +1322,17 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
 {
 	int i, j = 0, valid_extensions = 0;
 	u8 *edid, *new;
+	struct edid *override = NULL;
+
+	if (connector->override_edid)
+		override = drm_edid_duplicate((const struct edid *)
+					      connector->edid_blob_ptr->data);
+
+	if (!override)
+		override = drm_load_edid_firmware(connector);
+
+	if (!IS_ERR_OR_NULL(override))
+		return override;
 
 	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
 		return NULL;
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 358957118ca9..871326cbc465 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -199,8 +199,6 @@ drm_connector_detect(struct drm_connector *connector, bool force)
  *    drm_mode_probed_add(). New modes start their life with status as OK.
  *    Modes are added from a single source using the following priority order.
  *
- *    - debugfs 'override_edid' (used for testing only)
- *    - firmware EDID (drm_load_edid_firmware())
  *    - &drm_connector_helper_funcs.get_modes vfunc
  *    - if the connector status is connector_status_connected, standard
  *      VESA DMT modes up to 1024x768 are automatically added
@@ -305,22 +303,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 		goto prune;
 	}
 
-	if (connector->override_edid) {
-		struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
-
-		count = drm_add_edid_modes(connector, edid);
-		drm_edid_to_eld(connector, edid);
-	} else {
-		struct edid *edid = drm_load_edid_firmware(connector);
-		if (!IS_ERR_OR_NULL(edid)) {
-			drm_mode_connector_update_edid_property(connector, edid);
-			count = drm_add_edid_modes(connector, edid);
-			drm_edid_to_eld(connector, edid);
-			kfree(edid);
-		}
-		if (count == 0)
-			count = (*connector_funcs->get_modes)(connector);
-	}
+	count = (*connector_funcs->get_modes)(connector);
 
 	if (count == 0 && connector->status == connector_status_connected)
 		count = drm_add_modes_noedid(connector, 1024, 768);
-- 
2.1.4

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[PATCH 3/3] drm: handle override edid and firmware EDID at drm_do_get_edid() level

[Jani Nikula]

Handle debugfs override edid and firmware edid at the low level to
transparently and completely replace the real edid. Previously, we
practically only used the modes from the override EDID, and none of the
other data. This also prevents actual EDID reads when the EDID is to be
overridden, but retains the DDC probe.

FIXME: validate override edid, deduplicate firmware edid validation.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/drm_edid.c         | 15 +++++++++++++++
 drivers/gpu/drm/drm_probe_helper.c | 19 +------------------
 2 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 362036360724..054e2d74eafc 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1309,6 +1309,10 @@ static void connector_bad_edid(struct drm_connector *connector,
  * level, drivers must make all reasonable efforts to expose it as an I2C
  * adapter and use drm_get_edid() instead of abusing this function.
  *
+ * The EDID may be overridden using debugfs override_edid or firmare EDID
+ * (drm_load_edid_firmware()), in this priority order. Having either of them
+ * bypasses actual EDID reads.
+ *
  * Return: Pointer to valid EDID or NULL if we couldn't find any.
  */
 struct edid *drm_do_get_edid(struct drm_connector *connector,
@@ -1318,6 +1322,17 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
 {
 	int i, j = 0, valid_extensions = 0;
 	u8 *edid, *new;
+	struct edid *override = NULL;
+
+	if (connector->override_edid)
+		override = drm_edid_duplicate((const struct edid *)
+					      connector->edid_blob_ptr->data);
+
+	if (!override)
+		override = drm_load_edid_firmware(connector);
+
+	if (!IS_ERR_OR_NULL(override))
+		return override;
 
 	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
 		return NULL;
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 358957118ca9..871326cbc465 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -199,8 +199,6 @@ drm_connector_detect(struct drm_connector *connector, bool force)
  *    drm_mode_probed_add(). New modes start their life with status as OK.
  *    Modes are added from a single source using the following priority order.
  *
- *    - debugfs 'override_edid' (used for testing only)
- *    - firmware EDID (drm_load_edid_firmware())
  *    - &drm_connector_helper_funcs.get_modes vfunc
  *    - if the connector status is connector_status_connected, standard
  *      VESA DMT modes up to 1024x768 are automatically added
@@ -305,22 +303,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 		goto prune;
 	}
 
-	if (connector->override_edid) {
-		struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
-
-		count = drm_add_edid_modes(connector, edid);
-		drm_edid_to_eld(connector, edid);
-	} else {
-		struct edid *edid = drm_load_edid_firmware(connector);
-		if (!IS_ERR_OR_NULL(edid)) {
-			drm_mode_connector_update_edid_property(connector, edid);
-			count = drm_add_edid_modes(connector, edid);
-			drm_edid_to_eld(connector, edid);
-			kfree(edid);
-		}
-		if (count == 0)
-			count = (*connector_funcs->get_modes)(connector);
-	}
+	count = (*connector_funcs->get_modes)(connector);
 
 	if (count == 0 && connector->status == connector_status_connected)
 		count = drm_add_modes_noedid(connector, 1024, 768);
-- 
2.1.4

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Re: [PATCH 3/3] drm: handle override edid and firmware adid at drm_do_get_edid()

[Jani Nikula]

On Thu, 16 Feb 2017, Jani Nikula <jani.nikula@intel.com> wrote:
> Handle override edid and firmware edid at the low level to transparently
> and completely replace the real edid. This also prevents actual edid
> reads for them, but retains ddc probe.

Please ignore this stray patch, and look at the series at 
https://patchwork.freedesktop.org/series/19764/

Sorry for the noise,
Jani.

-- 
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✗ Fi.CI.BAT: failure for drm: handle override/firmware edid at the lowest level

[Patchwork]

== Series Details ==

Series: drm: handle override/firmware edid at the lowest level
URL   : https://patchwork.freedesktop.org/series/19764/
State : failure

== Summary ==

Series 19764v1 drm: handle override/firmware edid at the lowest level
https://patchwork.freedesktop.org/api/1.0/series/19764/revisions/1/mbox/

Test kms_force_connector_basic:
        Subgroup force-edid:
                pass       -> FAIL       (fi-byt-j1900)
                pass       -> FAIL       (fi-snb-2520m)
                pass       -> FAIL       (fi-ivb-3770)
                pass       -> FAIL       (fi-ivb-3520m)
                pass       -> FAIL       (fi-snb-2600)
        Subgroup prune-stale-modes:
                pass       -> FAIL       (fi-byt-j1900)
                pass       -> FAIL       (fi-snb-2520m)
                pass       -> FAIL       (fi-ivb-3770)
                pass       -> FAIL       (fi-ivb-3520m)
                pass       -> FAIL       (fi-snb-2600)

fi-bdw-5557u     total:252  pass:241  dwarn:0   dfail:0   fail:0   skip:11 
fi-bsw-n3050     total:252  pass:213  dwarn:0   dfail:0   fail:0   skip:39 
fi-bxt-j4205     total:252  pass:233  dwarn:0   dfail:0   fail:0   skip:19 
fi-bxt-t5700     total:83   pass:70   dwarn:0   dfail:0   fail:0   skip:12 
fi-byt-j1900     total:252  pass:223  dwarn:0   dfail:0   fail:2   skip:27 
fi-byt-n2820     total:252  pass:221  dwarn:0   dfail:0   fail:0   skip:31 
fi-hsw-4770      total:252  pass:236  dwarn:0   dfail:0   fail:0   skip:16 
fi-hsw-4770r     total:252  pass:236  dwarn:0   dfail:0   fail:0   skip:16 
fi-ilk-650       total:252  pass:202  dwarn:0   dfail:0   fail:0   skip:50 
fi-ivb-3520m     total:252  pass:232  dwarn:0   dfail:0   fail:2   skip:18 
fi-ivb-3770      total:252  pass:232  dwarn:0   dfail:0   fail:2   skip:18 
fi-kbl-7500u     total:252  pass:234  dwarn:0   dfail:0   fail:0   skip:18 
fi-skl-6260u     total:252  pass:242  dwarn:0   dfail:0   fail:0   skip:10 
fi-skl-6700hq    total:252  pass:235  dwarn:0   dfail:0   fail:0   skip:17 
fi-skl-6700k     total:252  pass:230  dwarn:4   dfail:0   fail:0   skip:18 
fi-skl-6770hq    total:252  pass:242  dwarn:0   dfail:0   fail:0   skip:10 
fi-snb-2520m     total:252  pass:222  dwarn:0   dfail:0   fail:2   skip:28 
fi-snb-2600      total:252  pass:221  dwarn:0   dfail:0   fail:2   skip:29 

89a932d98b6e1733011019c9872583a9c7c8fda3 drm-tip: 2017y-02m-16d-10h-06m-42s UTC integration manifest
ee36efc drm: handle override edid and firmware adid at drm_do_get_edid()
21cd354 drm: reset ELD if NULL edid is passed to drm_edid_to_eld
a0f096f drm: move edid property update and add modes out of edid firmware loader

== Logs ==

For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_3852/
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Re: [PATCH 2/3] drm: reset ELD if NULL edid is passed to drm_edid_to_eld

[Ville Syrjälä]

On Thu, Feb 16, 2017 at 12:36:43PM +0200, Jani Nikula wrote:
> Make the function useful for resetting, not just setting, the ELD.
> 
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 24e7b282f16c..362036360724 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3430,6 +3430,9 @@ void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
>  
>  	memset(eld, 0, sizeof(connector->eld));
>  
> +	if (!edid)
> +		return;
> +
>  	connector->latency_present[0] = false;
>  	connector->latency_present[1] = false;
>  	connector->video_latency[0] = 0;

/me thinks the check should be after all these.

Hmm. Actually the cea ext block check below should be safe wrt.
edid==NULL, so not sure we need this at all.

-- 
Ville Syrjälä
Intel OTC
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Re: [PATCH 3/3] drm: handle override edid and firmware EDID at drm_do_get_edid() level

[Ville Syrjälä]

On Thu, Feb 16, 2017 at 12:36:45PM +0200, Jani Nikula wrote:
> Handle debugfs override edid and firmware edid at the low level to
> transparently and completely replace the real edid. Previously, we
> practically only used the modes from the override EDID, and none of the
> other data. This also prevents actual EDID reads when the EDID is to be
> overridden, but retains the DDC probe.

Hmm. Isn't that a bad thing? If someone has broken DDC on their cable or
somethign then the override EDID wouldn't be returned by drm_get_edid().

> 
> FIXME: validate override edid, deduplicate firmware edid validation.
> 
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c         | 15 +++++++++++++++
>  drivers/gpu/drm/drm_probe_helper.c | 19 +------------------
>  2 files changed, 16 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 362036360724..054e2d74eafc 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -1309,6 +1309,10 @@ static void connector_bad_edid(struct drm_connector *connector,
>   * level, drivers must make all reasonable efforts to expose it as an I2C
>   * adapter and use drm_get_edid() instead of abusing this function.
>   *
> + * The EDID may be overridden using debugfs override_edid or firmare EDID
> + * (drm_load_edid_firmware()), in this priority order. Having either of them
> + * bypasses actual EDID reads.
> + *
>   * Return: Pointer to valid EDID or NULL if we couldn't find any.
>   */
>  struct edid *drm_do_get_edid(struct drm_connector *connector,
> @@ -1318,6 +1322,17 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
>  {
>  	int i, j = 0, valid_extensions = 0;
>  	u8 *edid, *new;
> +	struct edid *override = NULL;
> +
> +	if (connector->override_edid)
> +		override = drm_edid_duplicate((const struct edid *)
> +					      connector->edid_blob_ptr->data);
> +
> +	if (!override)
> +		override = drm_load_edid_firmware(connector);
> +
> +	if (!IS_ERR_OR_NULL(override))
> +		return override;
>  
>  	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
>  		return NULL;
> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> index 358957118ca9..871326cbc465 100644
> --- a/drivers/gpu/drm/drm_probe_helper.c
> +++ b/drivers/gpu/drm/drm_probe_helper.c
> @@ -199,8 +199,6 @@ drm_connector_detect(struct drm_connector *connector, bool force)
>   *    drm_mode_probed_add(). New modes start their life with status as OK.
>   *    Modes are added from a single source using the following priority order.
>   *
> - *    - debugfs 'override_edid' (used for testing only)
> - *    - firmware EDID (drm_load_edid_firmware())
>   *    - &drm_connector_helper_funcs.get_modes vfunc
>   *    - if the connector status is connector_status_connected, standard
>   *      VESA DMT modes up to 1024x768 are automatically added
> @@ -305,22 +303,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
>  		goto prune;
>  	}
>  
> -	if (connector->override_edid) {
> -		struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
> -
> -		count = drm_add_edid_modes(connector, edid);
> -		drm_edid_to_eld(connector, edid);
> -	} else {
> -		struct edid *edid = drm_load_edid_firmware(connector);
> -		if (!IS_ERR_OR_NULL(edid)) {
> -			drm_mode_connector_update_edid_property(connector, edid);
> -			count = drm_add_edid_modes(connector, edid);
> -			drm_edid_to_eld(connector, edid);
> -			kfree(edid);
> -		}
> -		if (count == 0)
> -			count = (*connector_funcs->get_modes)(connector);
> -	}
> +	count = (*connector_funcs->get_modes)(connector);
>  
>  	if (count == 0 && connector->status == connector_status_connected)
>  		count = drm_add_modes_noedid(connector, 1024, 768);
> -- 
> 2.1.4

-- 
Ville Syrjälä
Intel OTC
_______________________________________________
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dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH 3/3] drm: handle override edid and firmware EDID at drm_do_get_edid() level

[Jani Nikula]

On Thu, 16 Feb 2017, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> On Thu, Feb 16, 2017 at 12:36:45PM +0200, Jani Nikula wrote:
>> Handle debugfs override edid and firmware edid at the low level to
>> transparently and completely replace the real edid. Previously, we
>> practically only used the modes from the override EDID, and none of the
>> other data. This also prevents actual EDID reads when the EDID is to be
>> overridden, but retains the DDC probe.
>
> Hmm. Isn't that a bad thing? If someone has broken DDC on their cable or
> somethign then the override EDID wouldn't be returned by drm_get_edid().

Isn't this in line with how this currently works?

BR,
Jani.


>
>> 
>> FIXME: validate override edid, deduplicate firmware edid validation.
>> 
>> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
>> ---
>>  drivers/gpu/drm/drm_edid.c         | 15 +++++++++++++++
>>  drivers/gpu/drm/drm_probe_helper.c | 19 +------------------
>>  2 files changed, 16 insertions(+), 18 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
>> index 362036360724..054e2d74eafc 100644
>> --- a/drivers/gpu/drm/drm_edid.c
>> +++ b/drivers/gpu/drm/drm_edid.c
>> @@ -1309,6 +1309,10 @@ static void connector_bad_edid(struct drm_connector *connector,
>>   * level, drivers must make all reasonable efforts to expose it as an I2C
>>   * adapter and use drm_get_edid() instead of abusing this function.
>>   *
>> + * The EDID may be overridden using debugfs override_edid or firmare EDID
>> + * (drm_load_edid_firmware()), in this priority order. Having either of them
>> + * bypasses actual EDID reads.
>> + *
>>   * Return: Pointer to valid EDID or NULL if we couldn't find any.
>>   */
>>  struct edid *drm_do_get_edid(struct drm_connector *connector,
>> @@ -1318,6 +1322,17 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
>>  {
>>  	int i, j = 0, valid_extensions = 0;
>>  	u8 *edid, *new;
>> +	struct edid *override = NULL;
>> +
>> +	if (connector->override_edid)
>> +		override = drm_edid_duplicate((const struct edid *)
>> +					      connector->edid_blob_ptr->data);
>> +
>> +	if (!override)
>> +		override = drm_load_edid_firmware(connector);
>> +
>> +	if (!IS_ERR_OR_NULL(override))
>> +		return override;
>>  
>>  	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
>>  		return NULL;
>> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
>> index 358957118ca9..871326cbc465 100644
>> --- a/drivers/gpu/drm/drm_probe_helper.c
>> +++ b/drivers/gpu/drm/drm_probe_helper.c
>> @@ -199,8 +199,6 @@ drm_connector_detect(struct drm_connector *connector, bool force)
>>   *    drm_mode_probed_add(). New modes start their life with status as OK.
>>   *    Modes are added from a single source using the following priority order.
>>   *
>> - *    - debugfs 'override_edid' (used for testing only)
>> - *    - firmware EDID (drm_load_edid_firmware())
>>   *    - &drm_connector_helper_funcs.get_modes vfunc
>>   *    - if the connector status is connector_status_connected, standard
>>   *      VESA DMT modes up to 1024x768 are automatically added
>> @@ -305,22 +303,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
>>  		goto prune;
>>  	}
>>  
>> -	if (connector->override_edid) {
>> -		struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
>> -
>> -		count = drm_add_edid_modes(connector, edid);
>> -		drm_edid_to_eld(connector, edid);
>> -	} else {
>> -		struct edid *edid = drm_load_edid_firmware(connector);
>> -		if (!IS_ERR_OR_NULL(edid)) {
>> -			drm_mode_connector_update_edid_property(connector, edid);
>> -			count = drm_add_edid_modes(connector, edid);
>> -			drm_edid_to_eld(connector, edid);
>> -			kfree(edid);
>> -		}
>> -		if (count == 0)
>> -			count = (*connector_funcs->get_modes)(connector);
>> -	}
>> +	count = (*connector_funcs->get_modes)(connector);
>>  
>>  	if (count == 0 && connector->status == connector_status_connected)
>>  		count = drm_add_modes_noedid(connector, 1024, 768);
>> -- 
>> 2.1.4

-- 
Jani Nikula, Intel Open Source Technology Center
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH 3/3] drm: handle override edid and firmware EDID at drm_do_get_edid() level

[Ville Syrjälä]

On Thu, Feb 16, 2017 at 07:54:00PM +0200, Jani Nikula wrote:
> On Thu, 16 Feb 2017, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> > On Thu, Feb 16, 2017 at 12:36:45PM +0200, Jani Nikula wrote:
> >> Handle debugfs override edid and firmware edid at the low level to
> >> transparently and completely replace the real edid. Previously, we
> >> practically only used the modes from the override EDID, and none of the
> >> other data. This also prevents actual EDID reads when the EDID is to be
> >> overridden, but retains the DDC probe.
> >
> > Hmm. Isn't that a bad thing? If someone has broken DDC on their cable or
> > somethign then the override EDID wouldn't be returned by drm_get_edid().
> 
> Isn't this in line with how this currently works?

Not really. If connector->force is used and an override EDID is
provided, then drm_get_edid() likely never gets called, and the modes
come directly from the overide EDID. With your change forcing the
connector state wouldn't because we still wouldn't get any modes
from the override EDID due to the DDC check.

I guess one way around this would be to skip the DDC check if the
connector state has been forced.

> 
> BR,
> Jani.
> 
> 
> >
> >> 
> >> FIXME: validate override edid, deduplicate firmware edid validation.
> >> 
> >> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> >> ---
> >>  drivers/gpu/drm/drm_edid.c         | 15 +++++++++++++++
> >>  drivers/gpu/drm/drm_probe_helper.c | 19 +------------------
> >>  2 files changed, 16 insertions(+), 18 deletions(-)
> >> 
> >> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> >> index 362036360724..054e2d74eafc 100644
> >> --- a/drivers/gpu/drm/drm_edid.c
> >> +++ b/drivers/gpu/drm/drm_edid.c
> >> @@ -1309,6 +1309,10 @@ static void connector_bad_edid(struct drm_connector *connector,
> >>   * level, drivers must make all reasonable efforts to expose it as an I2C
> >>   * adapter and use drm_get_edid() instead of abusing this function.
> >>   *
> >> + * The EDID may be overridden using debugfs override_edid or firmare EDID
> >> + * (drm_load_edid_firmware()), in this priority order. Having either of them
> >> + * bypasses actual EDID reads.
> >> + *
> >>   * Return: Pointer to valid EDID or NULL if we couldn't find any.
> >>   */
> >>  struct edid *drm_do_get_edid(struct drm_connector *connector,
> >> @@ -1318,6 +1322,17 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
> >>  {
> >>  	int i, j = 0, valid_extensions = 0;
> >>  	u8 *edid, *new;
> >> +	struct edid *override = NULL;
> >> +
> >> +	if (connector->override_edid)
> >> +		override = drm_edid_duplicate((const struct edid *)
> >> +					      connector->edid_blob_ptr->data);
> >> +
> >> +	if (!override)
> >> +		override = drm_load_edid_firmware(connector);
> >> +
> >> +	if (!IS_ERR_OR_NULL(override))
> >> +		return override;
> >>  
> >>  	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
> >>  		return NULL;
> >> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> >> index 358957118ca9..871326cbc465 100644
> >> --- a/drivers/gpu/drm/drm_probe_helper.c
> >> +++ b/drivers/gpu/drm/drm_probe_helper.c
> >> @@ -199,8 +199,6 @@ drm_connector_detect(struct drm_connector *connector, bool force)
> >>   *    drm_mode_probed_add(). New modes start their life with status as OK.
> >>   *    Modes are added from a single source using the following priority order.
> >>   *
> >> - *    - debugfs 'override_edid' (used for testing only)
> >> - *    - firmware EDID (drm_load_edid_firmware())
> >>   *    - &drm_connector_helper_funcs.get_modes vfunc
> >>   *    - if the connector status is connector_status_connected, standard
> >>   *      VESA DMT modes up to 1024x768 are automatically added
> >> @@ -305,22 +303,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
> >>  		goto prune;
> >>  	}
> >>  
> >> -	if (connector->override_edid) {
> >> -		struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
> >> -
> >> -		count = drm_add_edid_modes(connector, edid);
> >> -		drm_edid_to_eld(connector, edid);
> >> -	} else {
> >> -		struct edid *edid = drm_load_edid_firmware(connector);
> >> -		if (!IS_ERR_OR_NULL(edid)) {
> >> -			drm_mode_connector_update_edid_property(connector, edid);
> >> -			count = drm_add_edid_modes(connector, edid);
> >> -			drm_edid_to_eld(connector, edid);
> >> -			kfree(edid);
> >> -		}
> >> -		if (count == 0)
> >> -			count = (*connector_funcs->get_modes)(connector);
> >> -	}
> >> +	count = (*connector_funcs->get_modes)(connector);
> >>  
> >>  	if (count == 0 && connector->status == connector_status_connected)
> >>  		count = drm_add_modes_noedid(connector, 1024, 768);
> >> -- 
> >> 2.1.4
> 
> -- 
> Jani Nikula, Intel Open Source Technology Center

-- 
Ville Syrjälä
Intel OTC
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH 3/3] drm: handle override edid and firmware EDID at drm_do_get_edid() level

[Jani Nikula]

On Thu, 16 Feb 2017, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> On Thu, Feb 16, 2017 at 07:54:00PM +0200, Jani Nikula wrote:
>> On Thu, 16 Feb 2017, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
>> > On Thu, Feb 16, 2017 at 12:36:45PM +0200, Jani Nikula wrote:
>> >> Handle debugfs override edid and firmware edid at the low level to
>> >> transparently and completely replace the real edid. Previously, we
>> >> practically only used the modes from the override EDID, and none of the
>> >> other data. This also prevents actual EDID reads when the EDID is to be
>> >> overridden, but retains the DDC probe.
>> >
>> > Hmm. Isn't that a bad thing? If someone has broken DDC on their cable or
>> > somethign then the override EDID wouldn't be returned by drm_get_edid().
>> 
>> Isn't this in line with how this currently works?
>
> Not really. If connector->force is used and an override EDID is
> provided, then drm_get_edid() likely never gets called, and the modes
> come directly from the overide EDID. With your change forcing the
> connector state wouldn't because we still wouldn't get any modes
> from the override EDID due to the DDC check.

Right.

> I guess one way around this would be to skip the DDC check if the
> connector state has been forced.

I guess I'm asking if you think the whole approach here is
workable. What we currently have is so flaky.

BR,
Jani.

>
>> 
>> BR,
>> Jani.
>> 
>> 
>> >
>> >> 
>> >> FIXME: validate override edid, deduplicate firmware edid validation.
>> >> 
>> >> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
>> >> ---
>> >>  drivers/gpu/drm/drm_edid.c         | 15 +++++++++++++++
>> >>  drivers/gpu/drm/drm_probe_helper.c | 19 +------------------
>> >>  2 files changed, 16 insertions(+), 18 deletions(-)
>> >> 
>> >> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
>> >> index 362036360724..054e2d74eafc 100644
>> >> --- a/drivers/gpu/drm/drm_edid.c
>> >> +++ b/drivers/gpu/drm/drm_edid.c
>> >> @@ -1309,6 +1309,10 @@ static void connector_bad_edid(struct drm_connector *connector,
>> >>   * level, drivers must make all reasonable efforts to expose it as an I2C
>> >>   * adapter and use drm_get_edid() instead of abusing this function.
>> >>   *
>> >> + * The EDID may be overridden using debugfs override_edid or firmare EDID
>> >> + * (drm_load_edid_firmware()), in this priority order. Having either of them
>> >> + * bypasses actual EDID reads.
>> >> + *
>> >>   * Return: Pointer to valid EDID or NULL if we couldn't find any.
>> >>   */
>> >>  struct edid *drm_do_get_edid(struct drm_connector *connector,
>> >> @@ -1318,6 +1322,17 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
>> >>  {
>> >>  	int i, j = 0, valid_extensions = 0;
>> >>  	u8 *edid, *new;
>> >> +	struct edid *override = NULL;
>> >> +
>> >> +	if (connector->override_edid)
>> >> +		override = drm_edid_duplicate((const struct edid *)
>> >> +					      connector->edid_blob_ptr->data);
>> >> +
>> >> +	if (!override)
>> >> +		override = drm_load_edid_firmware(connector);
>> >> +
>> >> +	if (!IS_ERR_OR_NULL(override))
>> >> +		return override;
>> >>  
>> >>  	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
>> >>  		return NULL;
>> >> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
>> >> index 358957118ca9..871326cbc465 100644
>> >> --- a/drivers/gpu/drm/drm_probe_helper.c
>> >> +++ b/drivers/gpu/drm/drm_probe_helper.c
>> >> @@ -199,8 +199,6 @@ drm_connector_detect(struct drm_connector *connector, bool force)
>> >>   *    drm_mode_probed_add(). New modes start their life with status as OK.
>> >>   *    Modes are added from a single source using the following priority order.
>> >>   *
>> >> - *    - debugfs 'override_edid' (used for testing only)
>> >> - *    - firmware EDID (drm_load_edid_firmware())
>> >>   *    - &drm_connector_helper_funcs.get_modes vfunc
>> >>   *    - if the connector status is connector_status_connected, standard
>> >>   *      VESA DMT modes up to 1024x768 are automatically added
>> >> @@ -305,22 +303,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
>> >>  		goto prune;
>> >>  	}
>> >>  
>> >> -	if (connector->override_edid) {
>> >> -		struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
>> >> -
>> >> -		count = drm_add_edid_modes(connector, edid);
>> >> -		drm_edid_to_eld(connector, edid);
>> >> -	} else {
>> >> -		struct edid *edid = drm_load_edid_firmware(connector);
>> >> -		if (!IS_ERR_OR_NULL(edid)) {
>> >> -			drm_mode_connector_update_edid_property(connector, edid);
>> >> -			count = drm_add_edid_modes(connector, edid);
>> >> -			drm_edid_to_eld(connector, edid);
>> >> -			kfree(edid);
>> >> -		}
>> >> -		if (count == 0)
>> >> -			count = (*connector_funcs->get_modes)(connector);
>> >> -	}
>> >> +	count = (*connector_funcs->get_modes)(connector);
>> >>  
>> >>  	if (count == 0 && connector->status == connector_status_connected)
>> >>  		count = drm_add_modes_noedid(connector, 1024, 768);
>> >> -- 
>> >> 2.1.4
>> 
>> -- 
>> Jani Nikula, Intel Open Source Technology Center

-- 
Jani Nikula, Intel Open Source Technology Center
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH 3/3] drm: handle override edid and firmware EDID at drm_do_get_edid() level

[Ville Syrjälä]

On Thu, Feb 16, 2017 at 08:59:13PM +0200, Jani Nikula wrote:
> On Thu, 16 Feb 2017, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> > On Thu, Feb 16, 2017 at 07:54:00PM +0200, Jani Nikula wrote:
> >> On Thu, 16 Feb 2017, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> >> > On Thu, Feb 16, 2017 at 12:36:45PM +0200, Jani Nikula wrote:
> >> >> Handle debugfs override edid and firmware edid at the low level to
> >> >> transparently and completely replace the real edid. Previously, we
> >> >> practically only used the modes from the override EDID, and none of the
> >> >> other data. This also prevents actual EDID reads when the EDID is to be
> >> >> overridden, but retains the DDC probe.
> >> >
> >> > Hmm. Isn't that a bad thing? If someone has broken DDC on their cable or
> >> > somethign then the override EDID wouldn't be returned by drm_get_edid().
> >> 
> >> Isn't this in line with how this currently works?
> >
> > Not really. If connector->force is used and an override EDID is
> > provided, then drm_get_edid() likely never gets called, and the modes
> > come directly from the overide EDID. With your change forcing the
> > connector state wouldn't because we still wouldn't get any modes
> > from the override EDID due to the DDC check.
> 
> Right.
> 
> > I guess one way around this would be to skip the DDC check if the
> > connector state has been forced.
> 
> I guess I'm asking if you think the whole approach here is
> workable. What we currently have is so flaky.

I'm 100% with you on that. So yes, I do like the idea.

I think the last time the override EDIDs were discussed someone was
suggesting that the EDID override itself should force the connector
state. IIRC Daniel didn't agree. I don't have a particularly strong
opinion either way, but I guess trying to preserve the current
semantics (ie. EDID override and connector status forcing are mostly
separate) would be the thing to aim for, at least initially.

> 
> BR,
> Jani.
> 
> >
> >> 
> >> BR,
> >> Jani.
> >> 
> >> 
> >> >
> >> >> 
> >> >> FIXME: validate override edid, deduplicate firmware edid validation.
> >> >> 
> >> >> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> >> >> ---
> >> >>  drivers/gpu/drm/drm_edid.c         | 15 +++++++++++++++
> >> >>  drivers/gpu/drm/drm_probe_helper.c | 19 +------------------
> >> >>  2 files changed, 16 insertions(+), 18 deletions(-)
> >> >> 
> >> >> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> >> >> index 362036360724..054e2d74eafc 100644
> >> >> --- a/drivers/gpu/drm/drm_edid.c
> >> >> +++ b/drivers/gpu/drm/drm_edid.c
> >> >> @@ -1309,6 +1309,10 @@ static void connector_bad_edid(struct drm_connector *connector,
> >> >>   * level, drivers must make all reasonable efforts to expose it as an I2C
> >> >>   * adapter and use drm_get_edid() instead of abusing this function.
> >> >>   *
> >> >> + * The EDID may be overridden using debugfs override_edid or firmare EDID
> >> >> + * (drm_load_edid_firmware()), in this priority order. Having either of them
> >> >> + * bypasses actual EDID reads.
> >> >> + *
> >> >>   * Return: Pointer to valid EDID or NULL if we couldn't find any.
> >> >>   */
> >> >>  struct edid *drm_do_get_edid(struct drm_connector *connector,
> >> >> @@ -1318,6 +1322,17 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
> >> >>  {
> >> >>  	int i, j = 0, valid_extensions = 0;
> >> >>  	u8 *edid, *new;
> >> >> +	struct edid *override = NULL;
> >> >> +
> >> >> +	if (connector->override_edid)
> >> >> +		override = drm_edid_duplicate((const struct edid *)
> >> >> +					      connector->edid_blob_ptr->data);
> >> >> +
> >> >> +	if (!override)
> >> >> +		override = drm_load_edid_firmware(connector);
> >> >> +
> >> >> +	if (!IS_ERR_OR_NULL(override))
> >> >> +		return override;
> >> >>  
> >> >>  	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
> >> >>  		return NULL;
> >> >> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> >> >> index 358957118ca9..871326cbc465 100644
> >> >> --- a/drivers/gpu/drm/drm_probe_helper.c
> >> >> +++ b/drivers/gpu/drm/drm_probe_helper.c
> >> >> @@ -199,8 +199,6 @@ drm_connector_detect(struct drm_connector *connector, bool force)
> >> >>   *    drm_mode_probed_add(). New modes start their life with status as OK.
> >> >>   *    Modes are added from a single source using the following priority order.
> >> >>   *
> >> >> - *    - debugfs 'override_edid' (used for testing only)
> >> >> - *    - firmware EDID (drm_load_edid_firmware())
> >> >>   *    - &drm_connector_helper_funcs.get_modes vfunc
> >> >>   *    - if the connector status is connector_status_connected, standard
> >> >>   *      VESA DMT modes up to 1024x768 are automatically added
> >> >> @@ -305,22 +303,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
> >> >>  		goto prune;
> >> >>  	}
> >> >>  
> >> >> -	if (connector->override_edid) {
> >> >> -		struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
> >> >> -
> >> >> -		count = drm_add_edid_modes(connector, edid);
> >> >> -		drm_edid_to_eld(connector, edid);
> >> >> -	} else {
> >> >> -		struct edid *edid = drm_load_edid_firmware(connector);
> >> >> -		if (!IS_ERR_OR_NULL(edid)) {
> >> >> -			drm_mode_connector_update_edid_property(connector, edid);
> >> >> -			count = drm_add_edid_modes(connector, edid);
> >> >> -			drm_edid_to_eld(connector, edid);
> >> >> -			kfree(edid);
> >> >> -		}
> >> >> -		if (count == 0)
> >> >> -			count = (*connector_funcs->get_modes)(connector);
> >> >> -	}
> >> >> +	count = (*connector_funcs->get_modes)(connector);
> >> >>  
> >> >>  	if (count == 0 && connector->status == connector_status_connected)
> >> >>  		count = drm_add_modes_noedid(connector, 1024, 768);
> >> >> -- 
> >> >> 2.1.4
> >> 
> >> -- 
> >> Jani Nikula, Intel Open Source Technology Center
> 
> -- 
> Jani Nikula, Intel Open Source Technology Center

-- 
Ville Syrjälä
Intel OTC
_______________________________________________
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Re: [PATCH 2/3] drm: reset ELD if NULL edid is passed to drm_edid_to_eld

[Jani Nikula]

On Thu, 16 Feb 2017, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> On Thu, Feb 16, 2017 at 12:36:43PM +0200, Jani Nikula wrote:
>> Make the function useful for resetting, not just setting, the ELD.
>> 
>> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
>> ---
>>  drivers/gpu/drm/drm_edid.c | 3 +++
>>  1 file changed, 3 insertions(+)
>> 
>> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
>> index 24e7b282f16c..362036360724 100644
>> --- a/drivers/gpu/drm/drm_edid.c
>> +++ b/drivers/gpu/drm/drm_edid.c
>> @@ -3430,6 +3430,9 @@ void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
>>  
>>  	memset(eld, 0, sizeof(connector->eld));
>>  
>> +	if (!edid)
>> +		return;
>> +
>>  	connector->latency_present[0] = false;
>>  	connector->latency_present[1] = false;
>>  	connector->video_latency[0] = 0;
>
> /me thinks the check should be after all these.

D'oh!

> Hmm. Actually the cea ext block check below should be safe wrt.
> edid==NULL, so not sure we need this at all.

I'd just like to be explicit and avoid the debug message on missing CEA
extensions if the whole EDID is missing.

BR,
Jani.



-- 
Jani Nikula, Intel Open Source Technology Center
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Re: [PATCH 2/3] drm: reset ELD if NULL edid is passed to drm_edid_to_eld

[Ville Syrjälä]

On Fri, Feb 17, 2017 at 04:02:02PM +0200, Jani Nikula wrote:
> On Thu, 16 Feb 2017, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> > On Thu, Feb 16, 2017 at 12:36:43PM +0200, Jani Nikula wrote:
> >> Make the function useful for resetting, not just setting, the ELD.
> >> 
> >> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> >> ---
> >>  drivers/gpu/drm/drm_edid.c | 3 +++
> >>  1 file changed, 3 insertions(+)
> >> 
> >> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> >> index 24e7b282f16c..362036360724 100644
> >> --- a/drivers/gpu/drm/drm_edid.c
> >> +++ b/drivers/gpu/drm/drm_edid.c
> >> @@ -3430,6 +3430,9 @@ void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
> >>  
> >>  	memset(eld, 0, sizeof(connector->eld));
> >>  
> >> +	if (!edid)
> >> +		return;
> >> +
> >>  	connector->latency_present[0] = false;
> >>  	connector->latency_present[1] = false;
> >>  	connector->video_latency[0] = 0;
> >
> > /me thinks the check should be after all these.
> 
> D'oh!
> 
> > Hmm. Actually the cea ext block check below should be safe wrt.
> > edid==NULL, so not sure we need this at all.
> 
> I'd just like to be explicit and avoid the debug message on missing CEA
> extensions if the whole EDID is missing.

Fair enough.

-- 
Ville Syrjälä
Intel OTC
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Re: [PATCH 3/3] drm: handle override edid and firmware EDID at drm_do_get_edid() level

[Daniel Vetter]

On Thu, Feb 16, 2017 at 09:14:45PM +0200, Ville Syrjälä wrote:
> On Thu, Feb 16, 2017 at 08:59:13PM +0200, Jani Nikula wrote:
> > On Thu, 16 Feb 2017, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> > > On Thu, Feb 16, 2017 at 07:54:00PM +0200, Jani Nikula wrote:
> > >> On Thu, 16 Feb 2017, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> > >> > On Thu, Feb 16, 2017 at 12:36:45PM +0200, Jani Nikula wrote:
> > >> >> Handle debugfs override edid and firmware edid at the low level to
> > >> >> transparently and completely replace the real edid. Previously, we
> > >> >> practically only used the modes from the override EDID, and none of the
> > >> >> other data. This also prevents actual EDID reads when the EDID is to be
> > >> >> overridden, but retains the DDC probe.
> > >> >
> > >> > Hmm. Isn't that a bad thing? If someone has broken DDC on their cable or
> > >> > somethign then the override EDID wouldn't be returned by drm_get_edid().
> > >> 
> > >> Isn't this in line with how this currently works?
> > >
> > > Not really. If connector->force is used and an override EDID is
> > > provided, then drm_get_edid() likely never gets called, and the modes
> > > come directly from the overide EDID. With your change forcing the
> > > connector state wouldn't because we still wouldn't get any modes
> > > from the override EDID due to the DDC check.
> > 
> > Right.
> > 
> > > I guess one way around this would be to skip the DDC check if the
> > > connector state has been forced.
> > 
> > I guess I'm asking if you think the whole approach here is
> > workable. What we currently have is so flaky.
> 
> I'm 100% with you on that. So yes, I do like the idea.
> 
> I think the last time the override EDIDs were discussed someone was
> suggesting that the EDID override itself should force the connector
> state. IIRC Daniel didn't agree. I don't have a particularly strong
> opinion either way, but I guess trying to preserve the current
> semantics (ie. EDID override and connector status forcing are mostly
> separate) would be the thing to aim for, at least initially.

Iirc I just said (well, I hope that's what I said, didn't check with past
self) that the current semantics we expose work like that. They might not
be sensible.

But anyway, I guess we need to tackle both the override edid and the
connector status forcing in one patch approach, and I guess doing it here
in drm_do_get_edid is indeed sensible. And if we can get away with it,
deriving the force state from the override edid (if present), but not the
other way round, would be good. Or at least the dvi-d vs. dvi-i part of
connector forcing (which isn't something we use on i915, but which
exists).
-Daniel

> 
> > 
> > BR,
> > Jani.
> > 
> > >
> > >> 
> > >> BR,
> > >> Jani.
> > >> 
> > >> 
> > >> >
> > >> >> 
> > >> >> FIXME: validate override edid, deduplicate firmware edid validation.
> > >> >> 
> > >> >> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> > >> >> ---
> > >> >>  drivers/gpu/drm/drm_edid.c         | 15 +++++++++++++++
> > >> >>  drivers/gpu/drm/drm_probe_helper.c | 19 +------------------
> > >> >>  2 files changed, 16 insertions(+), 18 deletions(-)
> > >> >> 
> > >> >> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> > >> >> index 362036360724..054e2d74eafc 100644
> > >> >> --- a/drivers/gpu/drm/drm_edid.c
> > >> >> +++ b/drivers/gpu/drm/drm_edid.c
> > >> >> @@ -1309,6 +1309,10 @@ static void connector_bad_edid(struct drm_connector *connector,
> > >> >>   * level, drivers must make all reasonable efforts to expose it as an I2C
> > >> >>   * adapter and use drm_get_edid() instead of abusing this function.
> > >> >>   *
> > >> >> + * The EDID may be overridden using debugfs override_edid or firmare EDID
> > >> >> + * (drm_load_edid_firmware()), in this priority order. Having either of them
> > >> >> + * bypasses actual EDID reads.
> > >> >> + *
> > >> >>   * Return: Pointer to valid EDID or NULL if we couldn't find any.
> > >> >>   */
> > >> >>  struct edid *drm_do_get_edid(struct drm_connector *connector,
> > >> >> @@ -1318,6 +1322,17 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
> > >> >>  {
> > >> >>  	int i, j = 0, valid_extensions = 0;
> > >> >>  	u8 *edid, *new;
> > >> >> +	struct edid *override = NULL;
> > >> >> +
> > >> >> +	if (connector->override_edid)
> > >> >> +		override = drm_edid_duplicate((const struct edid *)
> > >> >> +					      connector->edid_blob_ptr->data);
> > >> >> +
> > >> >> +	if (!override)
> > >> >> +		override = drm_load_edid_firmware(connector);
> > >> >> +
> > >> >> +	if (!IS_ERR_OR_NULL(override))
> > >> >> +		return override;
> > >> >>  
> > >> >>  	if ((edid = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
> > >> >>  		return NULL;
> > >> >> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> > >> >> index 358957118ca9..871326cbc465 100644
> > >> >> --- a/drivers/gpu/drm/drm_probe_helper.c
> > >> >> +++ b/drivers/gpu/drm/drm_probe_helper.c
> > >> >> @@ -199,8 +199,6 @@ drm_connector_detect(struct drm_connector *connector, bool force)
> > >> >>   *    drm_mode_probed_add(). New modes start their life with status as OK.
> > >> >>   *    Modes are added from a single source using the following priority order.
> > >> >>   *
> > >> >> - *    - debugfs 'override_edid' (used for testing only)
> > >> >> - *    - firmware EDID (drm_load_edid_firmware())
> > >> >>   *    - &drm_connector_helper_funcs.get_modes vfunc
> > >> >>   *    - if the connector status is connector_status_connected, standard
> > >> >>   *      VESA DMT modes up to 1024x768 are automatically added
> > >> >> @@ -305,22 +303,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
> > >> >>  		goto prune;
> > >> >>  	}
> > >> >>  
> > >> >> -	if (connector->override_edid) {
> > >> >> -		struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
> > >> >> -
> > >> >> -		count = drm_add_edid_modes(connector, edid);
> > >> >> -		drm_edid_to_eld(connector, edid);
> > >> >> -	} else {
> > >> >> -		struct edid *edid = drm_load_edid_firmware(connector);
> > >> >> -		if (!IS_ERR_OR_NULL(edid)) {
> > >> >> -			drm_mode_connector_update_edid_property(connector, edid);
> > >> >> -			count = drm_add_edid_modes(connector, edid);
> > >> >> -			drm_edid_to_eld(connector, edid);
> > >> >> -			kfree(edid);
> > >> >> -		}
> > >> >> -		if (count == 0)
> > >> >> -			count = (*connector_funcs->get_modes)(connector);
> > >> >> -	}
> > >> >> +	count = (*connector_funcs->get_modes)(connector);
> > >> >>  
> > >> >>  	if (count == 0 && connector->status == connector_status_connected)
> > >> >>  		count = drm_add_modes_noedid(connector, 1024, 768);
> > >> >> -- 
> > >> >> 2.1.4
> > >> 
> > >> -- 
> > >> Jani Nikula, Intel Open Source Technology Center
> > 
> > -- 
> > Jani Nikula, Intel Open Source Technology Center
> 
> -- 
> Ville Syrjälä
> Intel OTC

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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