[PATCH v2 0/3] drm/edid: don't log errors on absent or old CEA SAD blocks

[PATCH v2 0/3] drm/edid: don't log errors on absent or old CEA SAD blocks

[Jean Delvare]

Hi all,

This is my attempt to fix bug fdo#107825:
https://bugs.freedesktop.org/show_bug.cgi?id=107825

[PATCH 1/3] drm/amd: be quiet when no SAD block is found
[PATCH 2/3] drm/radeon: be quiet when no SAD block is found
[PATCH 3/3] drm/edid: no CEA extension is not an error

Changes since v1:
 * Fixed subject of patch 2
 * Treat CEA extension version < 3 as non-error too (suggested by Ville
   Syrjälä)

-- 
Jean Delvare
SUSE L3 Support
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[PATCH v2 1/3] drm/amd: be quiet when no SAD block is found

[Jean Delvare]

It is fine for displays without audio functionality to not provide
any SAD block in their EDID. Do not log an error in that case,
just return quietly.

This fixes half of bug fdo#107825:
https://bugs.freedesktop.org/show_bug.cgi?id=107825

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
---
No change since v1.

 drivers/gpu/drm/amd/amdgpu/dce_v10_0.c                    |    4 ++--
 drivers/gpu/drm/amd/amdgpu/dce_v11_0.c                    |    4 ++--
 drivers/gpu/drm/amd/amdgpu/dce_v6_0.c                     |    4 ++--
 drivers/gpu/drm/amd/amdgpu/dce_v8_0.c                     |    4 ++--
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c |    7 +++----
 5 files changed, 11 insertions(+), 12 deletions(-)

--- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c	2019-07-08 00:41:56.000000000 +0200
+++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c	2019-08-30 14:28:46.081682223 +0200
@@ -1345,10 +1345,10 @@ static void dce_v10_0_audio_write_sad_re
 	}
 
 	sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
-	if (sad_count <= 0) {
+	if (sad_count < 0)
 		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
+	if (sad_count <= 0)
 		return;
-	}
 	BUG_ON(!sads);
 
 	for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
--- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c	2019-07-08 00:41:56.000000000 +0200
+++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c	2019-08-30 14:29:27.276205310 +0200
@@ -1371,10 +1371,10 @@ static void dce_v11_0_audio_write_sad_re
 	}
 
 	sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
-	if (sad_count <= 0) {
+	if (sad_count < 0)
 		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
+	if (sad_count <= 0)
 		return;
-	}
 	BUG_ON(!sads);
 
 	for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
--- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c	2019-07-08 00:41:56.000000000 +0200
+++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c	2019-08-30 17:58:53.613953458 +0200
@@ -1248,10 +1248,10 @@ static void dce_v6_0_audio_write_sad_reg
 	}
 
 	sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
-	if (sad_count <= 0) {
+	if (sad_count < 0)
 		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
+	if (sad_count <= 0)
 		return;
-	}
 
 	for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
 		u32 tmp = 0;
--- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c	2019-07-08 00:41:56.000000000 +0200
+++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c	2019-08-30 14:29:01.948883708 +0200
@@ -1298,10 +1298,10 @@ static void dce_v8_0_audio_write_sad_reg
 	}
 
 	sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
-	if (sad_count <= 0) {
+	if (sad_count < 0)
 		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
+	if (sad_count <= 0)
 		return;
-	}
 	BUG_ON(!sads);
 
 	for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
--- linux-5.2.orig/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c	2019-07-08 00:41:56.000000000 +0200
+++ linux-5.2/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c	2019-08-30 14:31:03.086421910 +0200
@@ -98,11 +98,10 @@ enum dc_edid_status dm_helpers_parse_edi
 			(struct edid *) edid->raw_edid);
 
 	sad_count = drm_edid_to_sad((struct edid *) edid->raw_edid, &sads);
-	if (sad_count <= 0) {
-		DRM_INFO("SADs count is: %d, don't need to read it\n",
-				sad_count);
+	if (sad_count < 0)
+		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
+	if (sad_count <= 0)
 		return result;
-	}
 
 	edid_caps->audio_mode_count = sad_count < DC_MAX_AUDIO_DESC_COUNT ? sad_count : DC_MAX_AUDIO_DESC_COUNT;
 	for (i = 0; i < edid_caps->audio_mode_count; ++i) {

-- 
Jean Delvare
SUSE L3 Support
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Re: [PATCH v2 1/3] drm/amd: be quiet when no SAD block is found

[Harry Wentland]

On 2019-09-04 5:12 a.m., Jean Delvare wrote:
> It is fine for displays without audio functionality to not provide
> any SAD block in their EDID. Do not log an error in that case,
> just return quietly.
> 
> This fixes half of bug fdo#107825:
> https://bugs.freedesktop.org/show_bug.cgi?id=107825
> 
> Signed-off-by: Jean Delvare <jdelvare@suse.de>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: "Christian König" <christian.koenig@amd.com>
> Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Harry Wentland <harry.wentland@amd.com>
> Cc: Leo Li <sunpeng.li@amd.com>

Reviewed-by: Harry Wentland <harry.wentland@amd.com>

Harry

> ---
> No change since v1.
> 
>  drivers/gpu/drm/amd/amdgpu/dce_v10_0.c                    |    4 ++--
>  drivers/gpu/drm/amd/amdgpu/dce_v11_0.c                    |    4 ++--
>  drivers/gpu/drm/amd/amdgpu/dce_v6_0.c                     |    4 ++--
>  drivers/gpu/drm/amd/amdgpu/dce_v8_0.c                     |    4 ++--
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c |    7 +++----
>  5 files changed, 11 insertions(+), 12 deletions(-)
> 
> --- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c	2019-07-08 00:41:56.000000000 +0200
> +++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c	2019-08-30 14:28:46.081682223 +0200
> @@ -1345,10 +1345,10 @@ static void dce_v10_0_audio_write_sad_re
>  	}
>  
>  	sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
> -	if (sad_count <= 0) {
> +	if (sad_count < 0)
>  		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> +	if (sad_count <= 0)
>  		return;
> -	}
>  	BUG_ON(!sads);
>  
>  	for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
> --- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c	2019-07-08 00:41:56.000000000 +0200
> +++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c	2019-08-30 14:29:27.276205310 +0200
> @@ -1371,10 +1371,10 @@ static void dce_v11_0_audio_write_sad_re
>  	}
>  
>  	sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
> -	if (sad_count <= 0) {
> +	if (sad_count < 0)
>  		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> +	if (sad_count <= 0)
>  		return;
> -	}
>  	BUG_ON(!sads);
>  
>  	for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
> --- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c	2019-07-08 00:41:56.000000000 +0200
> +++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c	2019-08-30 17:58:53.613953458 +0200
> @@ -1248,10 +1248,10 @@ static void dce_v6_0_audio_write_sad_reg
>  	}
>  
>  	sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
> -	if (sad_count <= 0) {
> +	if (sad_count < 0)
>  		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> +	if (sad_count <= 0)
>  		return;
> -	}
>  
>  	for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
>  		u32 tmp = 0;
> --- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c	2019-07-08 00:41:56.000000000 +0200
> +++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c	2019-08-30 14:29:01.948883708 +0200
> @@ -1298,10 +1298,10 @@ static void dce_v8_0_audio_write_sad_reg
>  	}
>  
>  	sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
> -	if (sad_count <= 0) {
> +	if (sad_count < 0)
>  		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> +	if (sad_count <= 0)
>  		return;
> -	}
>  	BUG_ON(!sads);
>  
>  	for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
> --- linux-5.2.orig/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c	2019-07-08 00:41:56.000000000 +0200
> +++ linux-5.2/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c	2019-08-30 14:31:03.086421910 +0200
> @@ -98,11 +98,10 @@ enum dc_edid_status dm_helpers_parse_edi
>  			(struct edid *) edid->raw_edid);
>  
>  	sad_count = drm_edid_to_sad((struct edid *) edid->raw_edid, &sads);
> -	if (sad_count <= 0) {
> -		DRM_INFO("SADs count is: %d, don't need to read it\n",
> -				sad_count);
> +	if (sad_count < 0)
> +		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> +	if (sad_count <= 0)
>  		return result;
> -	}
>  
>  	edid_caps->audio_mode_count = sad_count < DC_MAX_AUDIO_DESC_COUNT ? sad_count : DC_MAX_AUDIO_DESC_COUNT;
>  	for (i = 0; i < edid_caps->audio_mode_count; ++i) {
> 
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Re: [PATCH v2 1/3] drm/amd: be quiet when no SAD block is found

[Alex Deucher]

On Wed, Sep 4, 2019 at 9:18 AM Harry Wentland <hwentlan@amd.com> wrote:
>
> On 2019-09-04 5:12 a.m., Jean Delvare wrote:
> > It is fine for displays without audio functionality to not provide
> > any SAD block in their EDID. Do not log an error in that case,
> > just return quietly.
> >
> > This fixes half of bug fdo#107825:
> > https://bugs.freedesktop.org/show_bug.cgi?id=107825
> >
> > Signed-off-by: Jean Delvare <jdelvare@suse.de>
> > Cc: Alex Deucher <alexander.deucher@amd.com>
> > Cc: "Christian König" <christian.koenig@amd.com>
> > Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
> > Cc: David Airlie <airlied@linux.ie>
> > Cc: Daniel Vetter <daniel@ffwll.ch>
> > Cc: Harry Wentland <harry.wentland@amd.com>
> > Cc: Leo Li <sunpeng.li@amd.com>
>
> Reviewed-by: Harry Wentland <harry.wentland@amd.com>

Patches 1 and 2 applied.

Thanks!

Alex

>
> Harry
>
> > ---
> > No change since v1.
> >
> >  drivers/gpu/drm/amd/amdgpu/dce_v10_0.c                    |    4 ++--
> >  drivers/gpu/drm/amd/amdgpu/dce_v11_0.c                    |    4 ++--
> >  drivers/gpu/drm/amd/amdgpu/dce_v6_0.c                     |    4 ++--
> >  drivers/gpu/drm/amd/amdgpu/dce_v8_0.c                     |    4 ++--
> >  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c |    7 +++----
> >  5 files changed, 11 insertions(+), 12 deletions(-)
> >
> > --- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c     2019-07-08 00:41:56.000000000 +0200
> > +++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c  2019-08-30 14:28:46.081682223 +0200
> > @@ -1345,10 +1345,10 @@ static void dce_v10_0_audio_write_sad_re
> >       }
> >
> >       sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
> > -     if (sad_count <= 0) {
> > +     if (sad_count < 0)
> >               DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> > +     if (sad_count <= 0)
> >               return;
> > -     }
> >       BUG_ON(!sads);
> >
> >       for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
> > --- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c     2019-07-08 00:41:56.000000000 +0200
> > +++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c  2019-08-30 14:29:27.276205310 +0200
> > @@ -1371,10 +1371,10 @@ static void dce_v11_0_audio_write_sad_re
> >       }
> >
> >       sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
> > -     if (sad_count <= 0) {
> > +     if (sad_count < 0)
> >               DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> > +     if (sad_count <= 0)
> >               return;
> > -     }
> >       BUG_ON(!sads);
> >
> >       for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
> > --- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c      2019-07-08 00:41:56.000000000 +0200
> > +++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c   2019-08-30 17:58:53.613953458 +0200
> > @@ -1248,10 +1248,10 @@ static void dce_v6_0_audio_write_sad_reg
> >       }
> >
> >       sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
> > -     if (sad_count <= 0) {
> > +     if (sad_count < 0)
> >               DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> > +     if (sad_count <= 0)
> >               return;
> > -     }
> >
> >       for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
> >               u32 tmp = 0;
> > --- linux-5.2.orig/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c      2019-07-08 00:41:56.000000000 +0200
> > +++ linux-5.2/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c   2019-08-30 14:29:01.948883708 +0200
> > @@ -1298,10 +1298,10 @@ static void dce_v8_0_audio_write_sad_reg
> >       }
> >
> >       sad_count = drm_edid_to_sad(amdgpu_connector_edid(connector), &sads);
> > -     if (sad_count <= 0) {
> > +     if (sad_count < 0)
> >               DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> > +     if (sad_count <= 0)
> >               return;
> > -     }
> >       BUG_ON(!sads);
> >
> >       for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
> > --- linux-5.2.orig/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c  2019-07-08 00:41:56.000000000 +0200
> > +++ linux-5.2/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c       2019-08-30 14:31:03.086421910 +0200
> > @@ -98,11 +98,10 @@ enum dc_edid_status dm_helpers_parse_edi
> >                       (struct edid *) edid->raw_edid);
> >
> >       sad_count = drm_edid_to_sad((struct edid *) edid->raw_edid, &sads);
> > -     if (sad_count <= 0) {
> > -             DRM_INFO("SADs count is: %d, don't need to read it\n",
> > -                             sad_count);
> > +     if (sad_count < 0)
> > +             DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> > +     if (sad_count <= 0)
> >               return result;
> > -     }
> >
> >       edid_caps->audio_mode_count = sad_count < DC_MAX_AUDIO_DESC_COUNT ? sad_count : DC_MAX_AUDIO_DESC_COUNT;
> >       for (i = 0; i < edid_caps->audio_mode_count; ++i) {
> >
> _______________________________________________
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[PATCH v2 2/3] drm/radeon: be quiet when no SAD block is found

[Jean Delvare]

It is fine for displays without audio functionality to not provide
any SAD block in their EDID. Do not log an error in that case,
just return quietly.

Inspired by a similar fix to the amdgpu driver in the context of bug
fdo#107825:
https://bugs.freedesktop.org/show_bug.cgi?id=107825

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
---
Changes since v1:
 * Fixed subject

 drivers/gpu/drm/radeon/radeon_audio.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-5.2.orig/drivers/gpu/drm/radeon/radeon_audio.c	2019-08-30 18:04:15.125056697 +0200
+++ linux-5.2/drivers/gpu/drm/radeon/radeon_audio.c	2019-08-30 18:04:35.078311347 +0200
@@ -367,10 +367,10 @@ static void radeon_audio_write_sad_regs(
 		return;
 
 	sad_count = drm_edid_to_sad(radeon_connector_edid(connector), &sads);
-	if (sad_count <= 0) {
+	if (sad_count < 0)
 		DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
+	if (sad_count <= 0)
 		return;
-	}
 	BUG_ON(!sads);
 
 	if (radeon_encoder->audio && radeon_encoder->audio->write_sad_regs)

-- 
Jean Delvare
SUSE L3 Support
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[PATCH v2 3/3] drm/edid: no CEA v3 extension is not an error

[Jean Delvare]

It is fine for displays without audio functionality to not implement
CEA v3 extension in their EDID. Do not return an error in that case,
instead return 0 as if there was a CEA v3 extension with no audio or
speaker block.

This fixes half of bug fdo#107825:
https://bugs.freedesktop.org/show_bug.cgi?id=107825

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
---
Changes since v1:
 * Treat CEA extension version < 3 as non-error too (suggested by Ville
   Syrjälä)

 drivers/gpu/drm/drm_edid.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- linux-5.2.orig/drivers/gpu/drm/drm_edid.c	2019-09-02 10:21:01.495525663 +0200
+++ linux-5.2/drivers/gpu/drm/drm_edid.c	2019-09-04 10:33:51.080273331 +0200
@@ -4130,12 +4130,12 @@ int drm_edid_to_sad(struct edid *edid, s
 	cea = drm_find_cea_extension(edid);
 	if (!cea) {
 		DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
-		return -ENOENT;
+		return 0;
 	}
 
 	if (cea_revision(cea) < 3) {
 		DRM_DEBUG_KMS("SAD: wrong CEA revision\n");
-		return -ENOTSUPP;
+		return 0;
 	}
 
 	if (cea_db_offsets(cea, &start, &end)) {
@@ -4191,12 +4191,12 @@ int drm_edid_to_speaker_allocation(struc
 	cea = drm_find_cea_extension(edid);
 	if (!cea) {
 		DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
-		return -ENOENT;
+		return 0;
 	}
 
 	if (cea_revision(cea) < 3) {
 		DRM_DEBUG_KMS("SAD: wrong CEA revision\n");
-		return -ENOTSUPP;
+		return 0;
 	}
 
 	if (cea_db_offsets(cea, &start, &end)) {

-- 
Jean Delvare
SUSE L3 Support
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