From nobody Thu Dec 18 06:22:21 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 D6BE65A10B for ; Sun, 23 Jun 2024 08:59:21 +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=1719133164; cv=none; b=iv9C0mogQmaNXbqESn4kljgf3qsxgkqe+W0qHhPJWhtWaPKijNoucnD974eXIklrMd80Z1a9BEGnkvmEsF7ERljsebzSlzhjTpknvl/TmKj5/xbFTS+iGAkb0JBitEHn48bA6TdS+JCYNYSZpKmq9fNiKDQljRc3N7XJUnebqAw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719133164; c=relaxed/simple; bh=rczzmpjjlHlCtAKyfdbQlMnDUcEam5QWSyl/gkZmeUI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=SLPeJhixoAg+Q76rQw3K2532oxcixbHnOmwQ6VqsD0Hr+9Dsr6SJnhhRKlmj4bjJpjdzIxd7MsdldwGrmHDXdwxV7he/uJU3N4RJWIQTU7Gm/66JWXNKp8DbMzvsiVqpxjYysigE7eO5n0l0R1bDeqkDBaTgGW836WAi6FkGdGo= 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=T49NgJZI; 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="T49NgJZI" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1719132689; bh=rczzmpjjlHlCtAKyfdbQlMnDUcEam5QWSyl/gkZmeUI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=T49NgJZIev0c63fiplfhzGkAuWQ/paHKXJ9+oa1374Ic3GcSGWJf5myt32dEIH1qi 3I/tomzIA9tRVYXA27wN9cxEZb+ye1RpFrC6JixWbFOOf0XIEaIE6+rSkbQ/x9dB2f BrUeKV4j2V9HgBpogKmho4NFjOqmPiJ9jCdr2/vc= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Sun, 23 Jun 2024 10:51:29 +0200 Subject: [PATCH v2 3/3] drm/amd/display: Add support backlight quirks 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: <20240623-amdgpu-min-backlight-quirk-v2-3-cecf7f49da9b@weissschuh.net> References: <20240623-amdgpu-min-backlight-quirk-v2-0-cecf7f49da9b@weissschuh.net> In-Reply-To: <20240623-amdgpu-min-backlight-quirk-v2-0-cecf7f49da9b@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 Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Dustin Howett , =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1719132688; l=2788; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=rczzmpjjlHlCtAKyfdbQlMnDUcEam5QWSyl/gkZmeUI=; b=91+X03/aUODL2GDH3ZqzK48/y08D6dI+XwyYt1sZeGqua4CMOayPkJrOzc+4B24uRR0caZ7vY ikjqi1dxeVRA9O1UNQHhVY4kjP/r2qXpoz/32Jsw8BJnXBbylFYY6tY X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= Not all platforms provide correct PWM backlight capabilities through ATIF. Use the generic drm backlight quirk infrastructure to override the capabilities where necessary. Signed-off-by: Thomas Wei=C3=9Fschuh --- drivers/gpu/drm/amd/amdgpu/Kconfig | 1 + drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 28 +++++++++++++++++++= ++++ 2 files changed, 29 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/Kconfig b/drivers/gpu/drm/amd/amdgp= u/Kconfig index 692fa7cf8fd2..4fe0e8e74bb9 100644 --- a/drivers/gpu/drm/amd/amdgpu/Kconfig +++ b/drivers/gpu/drm/amd/amdgpu/Kconfig @@ -25,6 +25,7 @@ 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 60404385d4d0..2d8a6d875170 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 @@ -3329,6 +3330,31 @@ static struct drm_mode_config_helper_funcs amdgpu_dm= _mode_config_helperfuncs =3D { .atomic_commit_setup =3D drm_dp_mst_atomic_setup_commit, }; =20 +static void amdgpu_dm_apply_backlight_quirks(struct amdgpu_dm_connector *a= connector, + struct amdgpu_dm_backlight_caps *caps) +{ + const struct drm_panel_backlight_quirk *quirk; + const struct drm_edid *edid; + + edid =3D drm_edid_alloc(aconnector->edid, EDID_LENGTH * (aconnector->edid= ->extensions + 1)); + if (!edid) + return; + + quirk =3D drm_get_panel_backlight_quirk(edid); + + drm_edid_free(edid); + + if (!quirk) + return; + + if (quirk->overrides.pwm_min_brightness && + caps->min_input_signal !=3D quirk->pwm_min_brightness) { + drm_info(aconnector->base.dev, + "Quirk: backlight min_input_signal=3D%d\n", quirk->pwm_min_brightness); + caps->min_input_signal =3D quirk->pwm_min_brightness; + } +} + static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnect= or) { struct amdgpu_dm_backlight_caps *caps; @@ -3369,6 +3395,8 @@ static void update_connector_ext_caps(struct amdgpu_d= m_connector *aconnector) caps->aux_min_input_signal =3D 0; caps->aux_max_input_signal =3D 512; } + + amdgpu_dm_apply_backlight_quirks(aconnector, caps); } =20 void amdgpu_dm_update_connector_after_detect( --=20 2.45.2