From nobody Mon Feb 9 07:23:20 2026 Received: from mail-m1973174.qiye.163.com (mail-m1973174.qiye.163.com [220.197.31.74]) (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 B73051ADC7E; Sat, 7 Feb 2026 08:09:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770451761; cv=none; b=dU/rAeFnc1Eg1or5tPOKWhvKIw/jmIZ7sN1ZQS0b8ClJ4/iVUBY6y0pxzBshMUQB6idCl02oNhOrT7+WLSEzwJnjOa7PyrhkWU25CiNUNxcWIb+8m94BfsaVn0fZkIRvTMF0zssVWPo0v4U21pjEtLPPeVgWflq0FTJLD6KLr7E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770451761; c=relaxed/simple; bh=PTcMGocOGLNZzpDNYg1KuEyBmQ+wecbqFTkvC/xXswA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=rGMD6w6rFSiE8zt0QuL/PmPQCazD0+v1NLhtJW/tLdyGnfqWzv/SsURK6leY318q5KckcGLosDFFw1JGwIoawcRwIWcuyJD5rZaiwPKKFJLOx9EQ2hiuiVYVOIj4YiudINo8A2tYinLftto6ROKrJPVTuaricLNHBVQ6B0GzPwI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=thundersoft.com; spf=pass smtp.mailfrom=thundersoft.com; dkim=pass (1024-bit key) header.d=thundersoft.com header.i=@thundersoft.com header.b=IT8kiHUS; arc=none smtp.client-ip=220.197.31.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=thundersoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=thundersoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=thundersoft.com header.i=@thundersoft.com header.b="IT8kiHUS" Received: from [127.0.1.1] (unknown [113.235.123.225]) by smtp.qiye.163.com (Hmail) with ESMTP id 3372cf66c; Sat, 7 Feb 2026 15:33:40 +0800 (GMT+08:00) From: Hongyang Zhao Date: Sat, 07 Feb 2026 15:32:55 +0800 Subject: [PATCH v3 2/3] drm/bridge: lt9611: Add support for single Port B input 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: <20260207-rubikpi-next-20260116-v3-2-23b9aa189a3a@thundersoft.com> References: <20260207-rubikpi-next-20260116-v3-0-23b9aa189a3a@thundersoft.com> In-Reply-To: <20260207-rubikpi-next-20260116-v3-0-23b9aa189a3a@thundersoft.com> To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vinod Koul , Bjorn Andersson , Konrad Dybcio , Dmitry Baryshkov , Christopher Obbard Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Roger Shimizu , linux-arm-msm@vger.kernel.org, Hongyang Zhao X-Mailer: b4 0.15-dev-47773 X-Developer-Signature: v=1; a=ed25519-sha256; t=1770449616; l=4162; i=hongyang.zhao@thundersoft.com; s=20251115; h=from:subject:message-id; bh=PTcMGocOGLNZzpDNYg1KuEyBmQ+wecbqFTkvC/xXswA=; b=D6xU4W1qPw4YTCvAhUtr9fmS/t5iXXLLGgCXL/QUflLYt4XU2U/yAknbhEHrR8tCUVIwzJyw5 TC0QAxCN6smAVL4ZhAyfsl0sJcU4PWnarpMvbH1VNZZIRGd5rDrsMo0 X-Developer-Key: i=hongyang.zhao@thundersoft.com; a=ed25519; pk=0M0CJ1s9WiFZwli2JsxLB9ykikp5WkpKzCWgpdANKNI= X-HM-Tid: 0a9c37054dc609d5kunm3723250e7f307e X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFITzdXWS1ZQUlXWQ8JGhUIEh9ZQVkZTU1IVkoYHRgZTE1OHUhJQlYVFAkWGhdVEwETFh oSFyQUDg9ZV1kYEgtZQVlKSkhVSUhOVUpJSFVJSU5ZV1kWGg8SFR0UWUFZT0tIVUpLSU9PT0hVSk tLVUpCS0tZBg++ DKIM-Signature: a=rsa-sha256; b=IT8kiHUSj4RARAHRV+rCu7+NpdqWtXrnpANLHCEhGApNdyAKlcVqUMkDgOI+UuTkwC9EuHSPdTy5AZeW3OyEKcwVkw+oz4PoC7mVcEfdPSUJ+UeunT79qefO9Ouki1sVIkX4DwwNttZeo7pJKQHPerMxxnYtx+FV28F/h5MJvsI=; c=relaxed/relaxed; s=default; d=thundersoft.com; v=1; bh=pHs0dodq2NjkLOpG7xo8CQbHcYnp5U793Xup4vGHqgY=; h=date:mime-version:subject:message-id:from; The LT9611 has two DSI input ports. The driver currently assumes Port A is always used for single-port configurations. However, some boards connect DSI to Port B only. Update the driver to detect which ports are populated from devicetree and configure the hardware accordingly: - If only port@1 (Port B) is populated, configure port swap (0x8303 bit 6) and byte_clk source (0x8250 bit 3:2) for Port B operation - If both ports are populated, use dual-port mode (Port A + B) - If only port@0 (Port A) is populated, use single Port A (existing behavior) Reviewed-by: Dmitry Baryshkov Signed-off-by: Hongyang Zhao --- drivers/gpu/drm/bridge/lontium-lt9611.c | 46 +++++++++++++++++++++++------= ---- 1 file changed, 32 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/brid= ge/lontium-lt9611.c index a2d032ee4744..5fc22489b078 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c @@ -116,12 +116,25 @@ static int lt9611_mipi_input_digital(struct lt9611 *l= t9611, { 0x830a, 0x00 }, { 0x824f, 0x80 }, { 0x8250, 0x10 }, + { 0x8303, 0x00 }, { 0x8302, 0x0a }, { 0x8306, 0x0a }, }; =20 - if (lt9611->dsi1_node) - reg_cfg[1].def =3D 0x03; + if (lt9611->dsi1_node) { + if (lt9611->dsi0_node) { + /* Dual port (Port A + B) */ + reg_cfg[1].def =3D 0x03; + } else { + /* + * Single port B: + * - 0x8303 bit 6: port swap (1=3DPortB as primary) + * - 0x8250 bit 3:2: byte_clk source (01=3DPortB) + */ + reg_cfg[3].def =3D 0x14; + reg_cfg[4].def =3D 0x40; + } + } =20 return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg= )); } @@ -202,7 +215,9 @@ static void lt9611_pcr_setup(struct lt9611 *lt9611, con= st struct drm_display_mod regmap_write(lt9611->regmap, 0x831d, pol); =20 regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg)); - if (lt9611->dsi1_node) { + + /* dual port: configure hact for combining two DSI inputs */ + if (lt9611->dsi0_node && lt9611->dsi1_node) { unsigned int hact =3D mode->hdisplay; =20 hact >>=3D 2; @@ -759,7 +774,8 @@ static enum drm_mode_status lt9611_bridge_mode_valid(st= ruct drm_bridge *bridge, if (mode->hdisplay > 3840) return MODE_BAD_HVALUE; =20 - if (mode->hdisplay > 2000 && !lt9611->dsi1_node) + /* high resolution requires dual port (Port A + B) */ + if (mode->hdisplay > 2000 && !(lt9611->dsi0_node && lt9611->dsi1_node)) return MODE_PANEL; =20 return MODE_OK; @@ -1015,13 +1031,13 @@ static int lt9611_parse_dt(struct device *dev, struct lt9611 *lt9611) { lt9611->dsi0_node =3D of_graph_get_remote_node(dev->of_node, 0, -1); - if (!lt9611->dsi0_node) { - dev_err(lt9611->dev, "failed to get remote node for primary dsi\n"); + lt9611->dsi1_node =3D of_graph_get_remote_node(dev->of_node, 1, -1); + + if (!lt9611->dsi0_node && !lt9611->dsi1_node) { + dev_err(lt9611->dev, "failed to get remote node for dsi\n"); return -ENODEV; } =20 - lt9611->dsi1_node =3D of_graph_get_remote_node(dev->of_node, 1, -1); - lt9611->ac_mode =3D of_property_read_bool(dev->of_node, "lt,ac-mode"); =20 return drm_of_find_panel_or_bridge(dev->of_node, 2, -1, NULL, <9611->ne= xt_bridge); @@ -1142,14 +1158,16 @@ static int lt9611_probe(struct i2c_client *client) =20 drm_bridge_add(<9611->bridge); =20 - /* Attach primary DSI */ - lt9611->dsi0 =3D lt9611_attach_dsi(lt9611, lt9611->dsi0_node); - if (IS_ERR(lt9611->dsi0)) { - ret =3D PTR_ERR(lt9611->dsi0); - goto err_remove_bridge; + /* Attach primary DSI (directly drives or Port A in dual-port mode) */ + if (lt9611->dsi0_node) { + lt9611->dsi0 =3D lt9611_attach_dsi(lt9611, lt9611->dsi0_node); + if (IS_ERR(lt9611->dsi0)) { + ret =3D PTR_ERR(lt9611->dsi0); + goto err_remove_bridge; + } } =20 - /* Attach secondary DSI, if specified */ + /* Attach secondary DSI (Port B in single or dual-port mode) */ if (lt9611->dsi1_node) { lt9611->dsi1 =3D lt9611_attach_dsi(lt9611, lt9611->dsi1_node); if (IS_ERR(lt9611->dsi1)) { --=20 2.43.0