The patch below does not apply to the 6.7-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.7.y git checkout FETCH_HEAD git cherry-pick -x 7a6931a476d30f0d6bf70b01a925f76f92d23940 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024012719-rebuff-sterling-948d@gregkh' --subject-prefix 'PATCH 6.7.y' HEAD^..

Possible dependencies:

7a6931a476d3 ("drm/amd/display: fix ABM disablement")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 7a6931a476d30f0d6bf70b01a925f76f92d23940 Mon Sep 17 00:00:00 2001 From: Hamza Mahfooz hamza.mahfooz@amd.com Date: Wed, 22 Nov 2023 14:50:34 -0500 Subject: [PATCH] drm/amd/display: fix ABM disablement

On recent versions of DMUB firmware, if we want to completely disable ABM we have to pass ABM_LEVEL_IMMEDIATE_DISABLE as the requested ABM level to DMUB. Otherwise, LCD eDP displays are unable to reach their maximum brightness levels. So, to fix this whenever the user requests an ABM level of 0 pass ABM_LEVEL_IMMEDIATE_DISABLE to DMUB instead. Also, to keep the user's experience consistent map ABM_LEVEL_IMMEDIATE_DISABLE to 0 when a user tries to read the requested ABM level.

Cc: stable@vger.kernel.org # 6.1+ Reviewed-by: Harry Wentland harry.wentland@amd.com Signed-off-by: Hamza Mahfooz hamza.mahfooz@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com

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 2be64c593c87..39a4b47b6804 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -6248,7 +6248,7 @@ int amdgpu_dm_connector_atomic_set_property(struct drm_connector *connector, dm_new_state->underscan_enable = val; ret = 0; } else if (property == adev->mode_info.abm_level_property) { - dm_new_state->abm_level = val; + dm_new_state->abm_level = val ?: ABM_LEVEL_IMMEDIATE_DISABLE; ret = 0; }

@@ -6293,7 +6293,8 @@ int amdgpu_dm_connector_atomic_get_property(struct drm_connector *connector, *val = dm_state->underscan_enable; ret = 0; } else if (property == adev->mode_info.abm_level_property) { - *val = dm_state->abm_level; + *val = (dm_state->abm_level != ABM_LEVEL_IMMEDIATE_DISABLE) ? + dm_state->abm_level : 0; ret = 0; }

@@ -6366,7 +6367,8 @@ void amdgpu_dm_connector_funcs_reset(struct drm_connector *connector) state->pbn = 0;

if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) - state->abm_level = amdgpu_dm_abm_level; + state->abm_level = amdgpu_dm_abm_level ?: + ABM_LEVEL_IMMEDIATE_DISABLE;

__drm_atomic_helper_connector_reset(connector, &state->base); }