[PATCH] drm/amd/display: Fix unintialized max_bpc state values

[PATCH] drm/amd/display: Fix unintialized max_bpc state values

[Nicholas Kazlauskas]

[Why]
If the "max bpc" isn't explicitly set in the atomic state then it
have a value of 0. This has the correct behavior of limiting a panel
to 8bpc in the case where the panel supports 8bpc. In the case of eDP
panels this isn't a true assumption - there are panels that can only
do 6bpc.

Banding occurs for these displays.

[How]
Initialize the max_bpc when the connector resets to 8bpc. Also carry
over the value when the state is duplicated.

Bugzilla: https://bugs.freedesktop.org/108825
Fixes: 307638884f72 ("drm/amd/display: Support amdgpu "max bpc" connector property")

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index ce00e56814ed..ede93d53e209 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3215,6 +3215,7 @@ void amdgpu_dm_connector_funcs_reset(struct drm_connector *connector)
 		state->underscan_enable = false;
 		state->underscan_hborder = 0;
 		state->underscan_vborder = 0;
+		state->max_bpc = 8;
 
 		__drm_atomic_helper_connector_reset(connector, &state->base);
 	}
@@ -3236,6 +3237,7 @@ amdgpu_dm_connector_atomic_duplicate_state(struct drm_connector *connector)
 
 	new_state->freesync_capable = state->freesync_capable;
 	new_state->abm_level = state->abm_level;
+	new_state->max_bpc = state->max_bpc;
 
 	return &new_state->base;
 }
-- 
2.17.1

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Re: [PATCH] drm/amd/display: Fix unintialized max_bpc state values

[Deucher, Alexander]

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Reviewed-by: Alex Deucher <alexander.deucher-5C7GfCeVMHo@public.gmane.org>

________________________________
From: amd-gfx <amd-gfx-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org> on behalf of Nicholas Kazlauskas <nicholas.kazlauskas-5C7GfCeVMHo@public.gmane.org>
Sent: Thursday, November 29, 2018 10:44:46 AM
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Cc: Kazlauskas, Nicholas
Subject: [PATCH] drm/amd/display: Fix unintialized max_bpc state values

[Why]
If the "max bpc" isn't explicitly set in the atomic state then it
have a value of 0. This has the correct behavior of limiting a panel
to 8bpc in the case where the panel supports 8bpc. In the case of eDP
panels this isn't a true assumption - there are panels that can only
do 6bpc.

Banding occurs for these displays.

[How]
Initialize the max_bpc when the connector resets to 8bpc. Also carry
over the value when the state is duplicated.

Bugzilla: https://bugs.freedesktop.org/108825
Fixes: 307638884f72 ("drm/amd/display: Support amdgpu "max bpc" connector property")

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas-5C7GfCeVMHo@public.gmane.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index ce00e56814ed..ede93d53e209 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3215,6 +3215,7 @@ void amdgpu_dm_connector_funcs_reset(struct drm_connector *connector)
                 state->underscan_enable = false;
                 state->underscan_hborder = 0;
                 state->underscan_vborder = 0;
+               state->max_bpc = 8;

                 __drm_atomic_helper_connector_reset(connector, &state->base);
         }
@@ -3236,6 +3237,7 @@ amdgpu_dm_connector_atomic_duplicate_state(struct drm_connector *connector)

         new_state->freesync_capable = state->freesync_capable;
         new_state->abm_level = state->abm_level;
+       new_state->max_bpc = state->max_bpc;

         return &new_state->base;
 }
--
2.17.1

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Re: [PATCH] drm/amd/display: Fix unintialized max_bpc state values

[Wentland, Harry]

On 2018-11-29 10:44 a.m., Nicholas Kazlauskas wrote:
> [Why]
> If the "max bpc" isn't explicitly set in the atomic state then it
> have a value of 0. This has the correct behavior of limiting a panel
> to 8bpc in the case where the panel supports 8bpc. In the case of eDP
> panels this isn't a true assumption - there are panels that can only
> do 6bpc.
> 
> Banding occurs for these displays.
> 
> [How]
> Initialize the max_bpc when the connector resets to 8bpc. Also carry
> over the value when the state is duplicated.
> 
> Bugzilla: https://bugs.freedesktop.org/108825
> Fixes: 307638884f72 ("drm/amd/display: Support amdgpu "max bpc" connector property")
> 
> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>

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

Harry

> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index ce00e56814ed..ede93d53e209 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -3215,6 +3215,7 @@ void amdgpu_dm_connector_funcs_reset(struct drm_connector *connector)
>  		state->underscan_enable = false;
>  		state->underscan_hborder = 0;
>  		state->underscan_vborder = 0;
> +		state->max_bpc = 8;
>  
>  		__drm_atomic_helper_connector_reset(connector, &state->base);
>  	}
> @@ -3236,6 +3237,7 @@ amdgpu_dm_connector_atomic_duplicate_state(struct drm_connector *connector)
>  
>  	new_state->freesync_capable = state->freesync_capable;
>  	new_state->abm_level = state->abm_level;
> +	new_state->max_bpc = state->max_bpc;
>  
>  	return &new_state->base;
>  }
> 
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[PATCH] drm/amd/display: Fix unintialized max_bpc state values

[Alex Deucher]

From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>

[Why]
If the "max bpc" isn't explicitly set in the atomic state then it
have a value of 0. This has the correct behavior of limiting a panel
to 8bpc in the case where the panel supports 8bpc. In the case of eDP
panels this isn't a true assumption - there are panels that can only
do 6bpc.

Banding occurs for these displays.

[How]
Initialize the max_bpc when the connector resets to 8bpc. Also carry
over the value when the state is duplicated.

Bugzilla: https://bugs.freedesktop.org/108825
Fixes: 307638884f72 ("drm/amd/display: Support amdgpu "max bpc" connector property")

Backport of commit 49f1c44b581b08e3289127ffe58bd208c3166701 upstream.

Fixes regression caused by the automatic patch select of these two patches:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/gpu/drm/amd?h=linux-4.19.y&id=a0c25b4098b8de23f34f81860ddc3cbaaa159189
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/gpu/drm/amd?h=linux-4.19.y&id=3374518d4d1ae021dc60885f4ea8dca0a3ca290f
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=109122

Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 49f1c44b581b08e3289127ffe58bd208c3166701)
Cc: <stable@vger.kernel.org> # 4.19.x
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 299def84e69c..d792735f1365 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2894,6 +2894,7 @@ void amdgpu_dm_connector_funcs_reset(struct drm_connector *connector)
 		state->underscan_enable = false;
 		state->underscan_hborder = 0;
 		state->underscan_vborder = 0;
+		state->max_bpc = 8;
 
 		__drm_atomic_helper_connector_reset(connector, &state->base);
 	}
@@ -2911,6 +2912,7 @@ amdgpu_dm_connector_atomic_duplicate_state(struct drm_connector *connector)
 	if (new_state) {
 		__drm_atomic_helper_connector_duplicate_state(connector,
 							      &new_state->base);
+		new_state->max_bpc = state->max_bpc;
 		return &new_state->base;
 	}
 
-- 
2.20.1