From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 6EB333B47D9; Mon, 10 Aug 2026 09:55:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786355743; cv=none; b=Trwy/rA2lmfx+YPZIwUeq02xp8RFpCIaNC2GboXosAYjoqcj8/Zf3SjXodalumF3gin2cGTdMH8m5v6yzh9kJQ4rMWsGsxomDikotJrvBY2Spo80jb0xy4O9K8VtAbztbFec8Mn7mzu38rDewJKCucoaylNCoagliHGglVVlR0M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786355743; c=relaxed/simple; bh=Bowpf5/pvv+5XsQhGmAgRnTtq9swcIDJArfdD0iEFUE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=nlRipmLsUCTnpIKy1EbAX02HGHMkUxbOzXA6d91qLKQ0Epjbtou8+Pm/Fww55vctcNjA8CsF9xJXw7WgsksgwCA62PMDvnUpp8y1EVC04DC3QRa0iHhXJVV7+xvmHjJjZoj7tCLIijwSJvL6+y1s8+5iFgFhSXOmN1ckH5wHcvA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BdlyOso0; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BdlyOso0" Received: by smtp.kernel.org (Postfix) with ESMTPS id BF665C2BCFA; Mon, 10 Aug 2026 09:55:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1786355742; bh=Bowpf5/pvv+5XsQhGmAgRnTtq9swcIDJArfdD0iEFUE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=BdlyOso0B4McvQe/cnE6EKBioXOJ9NbJmPHbvkJD+1ErZcu+JO+Mm6kGykBocjG5H Uohucq5kVHxSkeYwcGKq1VdoJuClgf9Kk57Q889MB/IbXmnyBjinPu6aC9Hwc1CrLS 530K4I8ffS4Ab6tiO993d3DfYLZrqG//vv7pKjV0g3ixH1kEW4LceDa05jEKndUaHU fAITzLm6hAjo8lgYQvCbrsRUgWYvFLnMnC78x97KO7xSpeR2AVcvrGDETHmpnwkTGS j9Sn129ZYPgZcJWkByS9kHurJJ3BtNf8jD22fD7HDTiF2XRltfSM6Z6kTMibu3yFEe d/WD16sV3P9eQ== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9F34DC5AC82; Mon, 10 Aug 2026 09:55:42 +0000 (UTC) From: David Heidelberg via B4 Relay Date: Mon, 10 Aug 2026 11:55:38 +0200 Subject: [PATCH v2 2/2] drm/panel: lg-sw43408: use the full DCS brightness range 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: 7bit Message-Id: <20260810-fix-blueline-panel-v2-2-9344dfdbc3f9@ixit.cz> References: <20260810-fix-blueline-panel-v2-0-9344dfdbc3f9@ixit.cz> In-Reply-To: <20260810-fix-blueline-panel-v2-0-9344dfdbc3f9@ixit.cz> To: Sumit Semwal , Casey Connolly , Neil Armstrong , Jessica Zhang , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Dmitry Baryshkov , Marijn Suijten , Vinod Koul Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, phone-devel@vger.kernel.org, David Heidelberg X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1395; i=david@ixit.cz; h=from:subject:message-id; bh=scglJ6aSldaji48JvrBM5A5u97auNkDSvGSlJqKRe5k=; b=owEBbQKS/ZANAwAIAWACP8TTSSByAcsmYgBqeaAc3VgRZEOaTM54OKlXYIzYbhoEhA65NKcDg 1Hc3lGC9UaJAjMEAAEIAB0WIQTXegnP7twrvVOnBHRgAj/E00kgcgUCanmgHAAKCRBgAj/E00kg cg7OD/40s8ISIFOnNA0G1UHYJYr6xaE0We5PGFZzosOsifznr43Ec3S+ss3FAnXBQ69OX8RTwVs kJb+U1thvNoo9EDrtBgyvaBZrGGSYyjxo9VmtLgytOxVi482WD3RG4LuZkgaWu81GUDwZ9zYSVy NO4/xXC3HARtYloGwunPGDZHOhOiz3iC+qScKC6ccLtUKa3jApxVtzMspF4rrIQQxJ2d+e6NNGV gokA/gVp71z/tNSNCv1vftLCqn/nji/w/Iq7iJEi+7QdMhQyMdN94H9Jz5/Pf7gdl07F/tz8GCz MJdsjurpIJbesWJhUNuy7nhnjGQw3g7YSOsHSrFPwuJSRSfzh4EIVzy9G168FdLV6WVuChMhLx5 bp0kQHbgrafoO1jtErlieC6lncLujZQt4MqORy2SD346WkN0cgWiFMREJPGBoBWcPgJxBjEXKaa mVTlnbJJThZ6SM81TKPVBjwouCw6auCzBwKpFmGr3do+kg7a+AICrGrcbKijzQTi2XYC58kVkV8 gK5XqCPRd5Cf8XA2GCSk4eZvVzomoul2uVz0F+ReyHpOdZelZI84QLXtHMS9yOOe6OhIsTKn4PF cXaXsNGbwJVrGhDCEBHxjx87SEKxH2BIGrrFgHM5QHH7A86C2Bokwea9FARk28AgNI2q9NF/T4/ ilWGZFgvrZMA/7Q== X-Developer-Key: i=david@ixit.cz; a=openpgp; fpr=D77A09CFEEDC2BBD53A7047460023FC4D3492072 X-Endpoint-Received: by B4 Relay for david@ixit.cz/default with auth_id=355 X-Original-From: David Heidelberg Reply-To: david@ixit.cz From: David Heidelberg The vendor firmware panel configuration (XBL DisplayDxe panel XML) declares DCSMaxBrightness 0x332 with a two-byte brightness command, and the driver already sends two bytes via mipi_dsi_dcs_set_display_brightness_large(). Capping max_brightness at 255 therefore limits the panel to ~31% of its real brightness range. Use the firmware maximum. Fixes: 069a6c0e94f9 ("drm: panel: Add LG sw43408 panel driver") Signed-off-by: David Heidelberg --- drivers/gpu/drm/panel/panel-lg-sw43408.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/panel/panel-lg-sw43408.c b/drivers/gpu/drm/panel/panel-lg-sw43408.c index 0bf8e08f10b9c..be132b65b0c13 100644 --- a/drivers/gpu/drm/panel/panel-lg-sw43408.c +++ b/drivers/gpu/drm/panel/panel-lg-sw43408.c @@ -203,17 +203,17 @@ static const struct backlight_ops sw43408_backlight_ops = { }; static int sw43408_backlight_init(struct sw43408_panel *ctx) { struct device *dev = &ctx->link->dev; const struct backlight_properties props = { .type = BACKLIGHT_PLATFORM, .brightness = 255, - .max_brightness = 255, + .max_brightness = 818, }; ctx->base.backlight = devm_backlight_device_register(dev, dev_name(dev), dev, ctx->link, &sw43408_backlight_ops, &props); if (IS_ERR(ctx->base.backlight)) -- 2.55.0