From nobody Fri Dec 19 18:31:30 2025 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5CDA8433CF; Sat, 24 Aug 2024 18:34:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.69.126.157 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724524479; cv=none; b=qj5olGBaTIjhpMzCFZTyUbQa+AvXMzIinmTDQ6hTWLS3EceGyBsnMXyFnQ3+0UIbn+dmS2SBenXTBEcTZiSR5EvdUNfOi91J8EUcw3Y53L0Wg5yyHXLSXNe7zQArfYpyhiA/By8XyKQaLunCDGFgK03OWl3QZwLNx0ocpxIBBFU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724524479; c=relaxed/simple; bh=pXwPNuj1+2MaBbsgOKVjjIsLJ5HBVXKxLzYgXNTSWNY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=pNnyYvZrxbNiG9sovKvr0tsQQxFtUi+/rNU3yFhY4mADmxeaJbDrIHsCeU1M8WwxXH0IZ+J68ZOgUolJI8qiuEzIny0k06i0o3z9Kl2SSdsV8wbqcdqBxLQLZCwgvX3/+Iv2deAtHp5TW9+RTabf+1WaFG9KV1Rka3NdVgrG1s0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net; spf=pass smtp.mailfrom=weissschuh.net; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b=TB30hA5X; arc=none smtp.client-ip=159.69.126.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b="TB30hA5X" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1724524474; bh=pXwPNuj1+2MaBbsgOKVjjIsLJ5HBVXKxLzYgXNTSWNY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=TB30hA5XnEa7fyrihN7qLIn+P3NA0zkD1xPozEjokv3NczFvkhKQq0l2XRsojyQ9Y 8aAV106FaaH3e1hR6xC5fFVaM3RkpCpVakdlpj/KMg09Nu5ewBem4SLzNTSK6mlqwN VuzHCR23sJJIjuqz22qtmBKwy/VPwa1fJX/G3WVw= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Sat, 24 Aug 2024 20:33:55 +0200 Subject: [PATCH v6 2/4] drm/amd/display: Add support for minimum backlight quirk Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240824-amdgpu-min-backlight-quirk-v6-2-1ed776a17fb3@weissschuh.net> References: <20240824-amdgpu-min-backlight-quirk-v6-0-1ed776a17fb3@weissschuh.net> In-Reply-To: <20240824-amdgpu-min-backlight-quirk-v6-0-1ed776a17fb3@weissschuh.net> To: Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , David Airlie , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Harry Wentland , Leo Li , Rodrigo Siqueira , Mario Limonciello , Matt Hartley , Kieran Levin , Hans de Goede , Jani Nikula , Xinhui Pan , Jonathan Corbet Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Dustin Howett , linux-doc@vger.kernel.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1724524474; l=2773; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=pXwPNuj1+2MaBbsgOKVjjIsLJ5HBVXKxLzYgXNTSWNY=; b=wZPXulQQnUKt4eZU7D/anz1D3UzcnVTFMef69VP4gLOdo12ou4ie823nDuY8HBS7Tlox1yc6c wUKJPUFEpRFCXW+39oSRRtA6Mb5muAIVtwUuLEoM+tj+O97iDinyO9N X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= Not all platforms provide the full range of PWM backlight capabilities supported by the hardware through ATIF. Use the generic drm panel minimum backlight quirk infrastructure to override the capabilities where necessary. Testing the backlight quirk together with the "panel_power_savings" sysfs file has not shown any negative impact. One quirk seems to be that 0% at panel_power_savings=3D0 seems to be slightly darker than at panel_power_savings=3D4. Signed-off-by: Thomas Wei=C3=9Fschuh Tested-by: Dustin L. Howett Reviewed-by: Mario Limonciello --- drivers/gpu/drm/amd/amdgpu/Kconfig | 1 + drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/Kconfig b/drivers/gpu/drm/amd/amdgp= u/Kconfig index 0051fb1b437f..655c10aef2e3 100644 --- a/drivers/gpu/drm/amd/amdgpu/Kconfig +++ b/drivers/gpu/drm/amd/amdgpu/Kconfig @@ -23,6 +23,7 @@ config DRM_AMDGPU select DRM_BUDDY select DRM_SUBALLOC_HELPER select DRM_EXEC + select DRM_PANEL_BACKLIGHT_QUIRKS # amdgpu depends on ACPI_VIDEO when ACPI is enabled, for select to work # ACPI_VIDEO's dependencies must also be selected. select INPUT if ACPI diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gp= u/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 983a977632ff..056960ea335c 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -93,6 +93,7 @@ #include #include #include +#include #include #include #include @@ -3333,6 +3334,8 @@ static void update_connector_ext_caps(struct amdgpu_d= m_connector *aconnector) struct drm_connector *conn_base; struct amdgpu_device *adev; struct drm_luminance_range_info *luminance_range; + const struct drm_edid *drm_edid; + int min_input_signal_override; =20 if (aconnector->bl_idx =3D=3D -1 || aconnector->dc_link->connector_signal !=3D SIGNAL_TYPE_EDP) @@ -3367,6 +3370,13 @@ static void update_connector_ext_caps(struct amdgpu_= dm_connector *aconnector) caps->aux_min_input_signal =3D 0; caps->aux_max_input_signal =3D 512; } + + drm_edid =3D drm_edid_alloc(aconnector->edid, + EDID_LENGTH * (aconnector->edid->extensions + 1)); + min_input_signal_override =3D drm_get_panel_min_brightness_quirk(drm_edid= ); + drm_edid_free(drm_edid); + if (min_input_signal_override >=3D 0) + caps->min_input_signal =3D min_input_signal_override; } =20 void amdgpu_dm_update_connector_after_detect( --=20 2.46.0