From nobody Fri Oct 2 01:12:58 2026 Received: from mx1.white.stw.pengutronix.de (mx1.white.stw.pengutronix.de [185.203.200.13]) (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 973A32EEE99; Thu, 6 Aug 2026 13:17:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.200.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022255; cv=none; b=fa7KOKMoyEHzgjLxyu9eihJ1wFyTc1ZKe1XvFVPsC7mQYPfNQV6Pjstcrk2b1/FMrykI20ieewbz4Kr4G1nTrrVUDn7PBP+NB0/Qliu/9unSyRAhdYu3txAfrTzTYiULdJPv44/zt/kiv4WAKyxNS20hLpLtl3aMEECkD//rGmA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022255; c=relaxed/simple; bh=MMjIeFwYrtdxRxIyuWQgjHCSq2RWv7+CCUYqiWdjS+E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uUbIEZeFZ25EZSqU3Xz6RKpfYTiWMpxZhbNrIeSW81D2xCaE/KhhSR0tZXQcldNfT8K7j3B2PoUZ6h+bCdF07dqliXRMeoZr4KeqXxSM4lNIXtUNMh9RZJSkYXdu2fjw3h0wrKIRHjIK+NwvCrCv04yhHUICZqly15w8snpLqHM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.200.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de (drehscheibe.grey.stw.pengutronix.de [IPv6:2a0a:edc0:0:c01:1d::a2]) (Authenticated sender: relay-from-drehscheibe.grey.stw.pengutronix.de) by mx1.white.stw.pengutronix.de (Postfix) with ESMTPSA id 642C2202055; Thu, 06 Aug 2026 15:17:23 +0200 (CEST) Received: from dude05.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::54]) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1wrxyN-000664-11; Thu, 06 Aug 2026 15:17:23 +0200 From: Philipp Zabel To: Vishnu Saini , Yi Zhang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Nilesh Laad , Gopi Botlagunta , venkata.valluru@oss.qualcomm.com, Jessica Zhang , Philipp Zabel Subject: [PATCH 1/7] drm/bridge: lt9211: drop delayed work Date: Thu, 6 Aug 2026 15:17:09 +0200 Message-ID: <20260806131715.508557-2-p.zabel@pengutronix.de> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260806131715.508557-1-p.zabel@pengutronix.de> References: <20260719-add-lt9211c-bridge-v6-2-e56d22152586@oss.qualcomm.com> <20260806131715.508557-1-p.zabel@pengutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Replace the delayed work with a delay and synchronous initialization in atomic_enable. This should fix all 5 issues sashiko flagged as high priority [1]. The next bridge or panel in the chain may depend on the LVDS signal being active after atomic_enable, so arbitrarily deferring bridge initialization is not an option. [1] https://sashiko.dev/#/patchset/20260719-add-lt9211c-bridge-v6-0-e56d221= 52586%40oss.qualcomm.com Signed-off-by: Philipp Zabel Tested-by: Philipp Zabel --- drivers/gpu/drm/bridge/lontium-lt9211.c | 93 ++++++++----------------- 1 file changed, 30 insertions(+), 63 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/brid= ge/lontium-lt9211.c index ffd0f9f08e2d..1b5cb601adde 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9211.c +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c @@ -62,14 +62,7 @@ struct lt9211 { struct regulator *vccio; bool lvds_dual_link; bool lvds_dual_link_even_odd_swap; - /* LT9211C specific fields */ enum lt9211_chip_type chip_type; - struct workqueue_struct *wq; - struct delayed_work lt9211_dw; - struct drm_display_mode mode; - bool bpp24; - bool jeida; - bool de; }; =20 static const struct regmap_range lt9211_rw_ranges[] =3D { @@ -154,8 +147,6 @@ static const struct regmap_config lt9211c_regmap_config= =3D { .max_register =3D 0xda00, }; =20 -static void lt9211_delayed_work_func(struct work_struct *work); - static struct lt9211 *bridge_to_lt9211(struct drm_bridge *bridge) { return container_of(bridge, struct lt9211, bridge); @@ -896,8 +887,8 @@ static int lt9211c_configure_plls(struct lt9211 *ctx, return ret; } =20 -static int lt9211c_configure_tx(struct lt9211 *ctx, - const struct drm_display_mode *mode) +static int lt9211c_configure_tx(struct lt9211 *ctx, bool jeida, bool bpp24, + bool de, const struct drm_display_mode *mode) { const struct reg_sequence lt9211c_tx_phy_off_seq[] =3D { { 0x8236, 0x00 }, @@ -949,10 +940,10 @@ static int lt9211c_configure_tx(struct lt9211 *ctx, { 0x8556, 0x20 }, =20 { 0x8568, 0x00 }, - { 0x856e, 0x10 | (ctx->de ? BIT(6) : 0) }, - { 0x856f, 0x81 | (ctx->jeida ? BIT(6) : 0) | + { 0x856e, 0x10 | (de ? BIT(6) : 0) }, + { 0x856f, 0x81 | (jeida ? BIT(6) : 0) | (ctx->lvds_dual_link ? BIT(4) : 0) | - (ctx->bpp24 ? BIT(2) : 0) }, + (bpp24 ? BIT(2) : 0) }, }; =20 const struct reg_sequence lt9211c_tx_ssc_seq[] =3D { @@ -995,7 +986,7 @@ static int lt9211c_configure_tx(struct lt9211 *ctx, dev_info(ctx->dev, "dual_link=3D%d,even_odd_swap=3D%d,bpp24=3D%d,jeida=3D%d,de=3D%d\n", ctx->lvds_dual_link, ctx->lvds_dual_link_even_odd_swap, - ctx->bpp24, ctx->jeida, ctx->de); + bpp24, jeida, de); =20 ret =3D regmap_multi_reg_write(ctx->regmap, lt9211c_tx_phy_off_seq, ARRAY_SIZE(lt9211c_tx_phy_off_seq)); @@ -1138,39 +1129,6 @@ static int lt9211c_configure_tx(struct lt9211 *ctx, return 0; } =20 -static void lt9211_delayed_work_func(struct work_struct *work) -{ - struct delayed_work *dw =3D to_delayed_work(work); - struct lt9211 *ctx =3D container_of(dw, struct lt9211, lt9211_dw); - const struct drm_display_mode *mode =3D &ctx->mode; - int ret; - - if (ctx->chip_type !=3D LT9211C) { - dev_err(ctx->dev, "LT9211: Delayed work called for non-LT9211C chip\n"); - return; - } - - ret =3D lt9211c_configure_rx(ctx); - if (ret) - return; - - ret =3D lt9211c_autodetect_rx(ctx, mode); - if (ret) - return; - - ret =3D lt9211c_configure_timing(ctx, mode); - if (ret) - return; - - ret =3D lt9211c_configure_plls(ctx, mode); - if (ret) - return; - - ret =3D lt9211c_configure_tx(ctx, mode); - if (ret) - return; -} - static void lt9211_atomic_enable(struct drm_bridge *bridge, struct drm_atomic_commit *state) { @@ -1240,11 +1198,30 @@ static void lt9211_atomic_enable(struct drm_bridge = *bridge, if (ret) return; =20 - if (ctx->chip_type =3D=3D LT9211C && ctx->wq) { - drm_mode_copy(&ctx->mode, mode); - /* LT9211C must enable after mipi clock enable */ - queue_delayed_work(ctx->wq, &ctx->lt9211_dw, - msecs_to_jiffies(100)); + if (ctx->chip_type =3D=3D LT9211C) { + msleep(100); + + ret =3D lt9211c_configure_rx(ctx); + if (ret) + return; + + ret =3D lt9211c_autodetect_rx(ctx, mode); + if (ret) + return; + + ret =3D lt9211c_configure_timing(ctx, mode); + if (ret) + return; + + ret =3D lt9211c_configure_plls(ctx, mode); + if (ret) + return; + + ret =3D lt9211c_configure_tx(ctx, lvds_format_jeida, lvds_format_24bpp, + bus_flags & DRM_BUS_FLAG_DE_HIGH, mode); + if (ret) + return; + dev_dbg(ctx->dev, "LT9211C enabled.\n"); return; } @@ -1501,13 +1478,6 @@ static int lt9211_probe(struct i2c_client *client) if (IS_ERR(ctx->regmap)) return PTR_ERR(ctx->regmap); =20 - if (ctx->chip_type =3D=3D LT9211C) { - ctx->wq =3D create_workqueue("lt9211_work"); - if (!ctx->wq) - return -ENOMEM; - INIT_DELAYED_WORK(&ctx->lt9211_dw, lt9211_delayed_work_func); - } - dev_set_drvdata(dev, ctx); i2c_set_clientdata(client, ctx); =20 @@ -1525,9 +1495,6 @@ static void lt9211_remove(struct i2c_client *client) { struct lt9211 *ctx =3D i2c_get_clientdata(client); =20 - if (ctx->wq) - destroy_workqueue(ctx->wq); - drm_bridge_remove(&ctx->bridge); } =20 --=20 2.47.3 From nobody Fri Oct 2 01:12:58 2026 Received: from mx1.white.stw.pengutronix.de (mx1.white.stw.pengutronix.de [185.203.200.13]) (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 96CF02771B; Thu, 6 Aug 2026 13:17:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de (drehscheibe.grey.stw.pengutronix.de [IPv6:2a0a:edc0:0:c01:1d::a2]) (Authenticated sender: relay-from-drehscheibe.grey.stw.pengutronix.de) by mx1.white.stw.pengutronix.de (Postfix) with ESMTPSA id 155262020FE; Thu, 06 Aug 2026 15:17:24 +0200 (CEST) Received: from dude05.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::54]) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1wrxyO-000664-00; Thu, 06 Aug 2026 15:17:24 +0200 From: Philipp Zabel To: Vishnu Saini , Yi Zhang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Nilesh Laad , Gopi Botlagunta , venkata.valluru@oss.qualcomm.com, Jessica Zhang , Philipp Zabel Subject: [PATCH 2/7] drm/bridge: lt9211: fix regmap_write error handling Date: Thu, 6 Aug 2026 15:17:10 +0200 Message-ID: <20260806131715.508557-3-p.zabel@pengutronix.de> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260806131715.508557-1-p.zabel@pengutronix.de> References: <20260719-add-lt9211c-bridge-v6-2-e56d22152586@oss.qualcomm.com> <20260806131715.508557-1-p.zabel@pengutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Do not try to accumulate error return values with bitwise OR. Fixes the remaining issue flagged by sashiko as low priority [1]. [1] https://sashiko.dev/#/patchset/20260719-add-lt9211c-bridge-v6-0-e56d221= 52586%40oss.qualcomm.com Signed-off-by: Philipp Zabel Tested-by: Philipp Zabel --- drivers/gpu/drm/bridge/lontium-lt9211.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/brid= ge/lontium-lt9211.c index 1b5cb601adde..bf72d1bcdb48 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9211.c +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c @@ -755,6 +755,7 @@ static int lt9211c_configure_plls(struct lt9211 *ctx, }; =20 unsigned int pval; + unsigned int val; int ret; u8 div; u32 pcr_m; @@ -774,7 +775,9 @@ static int lt9211c_configure_plls(struct lt9211 *ctx, =20 if (mode->clock < 22000) { ret =3D regmap_write(ctx->regmap, 0x822f, 0x07); - ret |=3D regmap_write(ctx->regmap, 0x822c, 0x01); + if (ret) + return ret; + ret =3D regmap_write(ctx->regmap, 0x822c, 0x01); div =3D 16; } else if (mode->clock < 44000) { ret =3D regmap_write(ctx->regmap, 0x822f, 0x07); @@ -844,15 +847,17 @@ static int lt9211c_configure_plls(struct lt9211 *ctx, if (ret) return ret; =20 - if (mode->clock < 44000) { - ret =3D regmap_write(ctx->regmap, 0xd00c, 0x60); - ret |=3D regmap_write(ctx->regmap, 0xd01b, 0x00); - ret |=3D regmap_write(ctx->regmap, 0xd01c, 0x60); - } else { - ret =3D regmap_write(ctx->regmap, 0xd00c, 0x40); - ret |=3D regmap_write(ctx->regmap, 0xd01b, 0x00); - ret |=3D regmap_write(ctx->regmap, 0xd01c, 0x40); - } + if (mode->clock < 44000) + val =3D 0x60; + else + val =3D 0x40; + ret =3D regmap_write(ctx->regmap, 0xd00c, val); + if (ret) + return ret; + ret =3D regmap_write(ctx->regmap, 0xd01b, 0x00); + if (ret) + return ret; + ret =3D regmap_write(ctx->regmap, 0xd01c, val); if (ret) return ret; =20 --=20 2.47.3 From nobody Fri Oct 2 01:12:58 2026 Received: from mx1.white.stw.pengutronix.de (mx1.white.stw.pengutronix.de [185.203.200.13]) (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 D39AC23BD06; Thu, 6 Aug 2026 13:17:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.200.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022256; cv=none; b=jxFZdUOa58zctk5ATjPu1e532qiLbRgQJwFwS3YlmCKCH4RBvFgcw04yPaItFPDF/NIkYMWc02hpQYQrdShZj8qcEGJkU1Fm41XsMT26zBct1hPHu7wMP9nIuEmi9Y7IGZXO/KlRPVKQHAH0fRjMf6WYyx07yNa782dh7RrKvQU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022256; c=relaxed/simple; bh=2yYNybOIFZlz62XGwm8SsbRHs1B3ihVVSO1s9tLK0WQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SJyTiUhnCzr5m1/lbBBqm9LQQLs21aF2NBgh3ToPOfAuU95n8AJ7ixZLz3V0rmyhr+Vznooz6iY18jReevcee153WpVgKAxjWxqczPrncYnNvRVXSIjHwSBT+IDaz3Fnwnsm4nHjD18I+0DyP7pnBhPbeVsaSdrgPWcx8fDhkSA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.200.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de (drehscheibe.grey.stw.pengutronix.de [IPv6:2a0a:edc0:0:c01:1d::a2]) (Authenticated sender: relay-from-drehscheibe.grey.stw.pengutronix.de) by mx1.white.stw.pengutronix.de (Postfix) with ESMTPSA id 9C89A202108; Thu, 06 Aug 2026 15:17:25 +0200 (CEST) Received: from dude05.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::54]) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1wrxyP-000664-1h; Thu, 06 Aug 2026 15:17:25 +0200 From: Philipp Zabel To: Vishnu Saini , Yi Zhang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Nilesh Laad , Gopi Botlagunta , venkata.valluru@oss.qualcomm.com, Jessica Zhang , Philipp Zabel Subject: [PATCH 3/7] drm/bridge: lt9211: use regmap_write_bits Date: Thu, 6 Aug 2026 15:17:11 +0200 Message-ID: <20260806131715.508557-4-p.zabel@pengutronix.de> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260806131715.508557-1-p.zabel@pengutronix.de> References: <20260719-add-lt9211c-bridge-v6-2-e56d22152586@oss.qualcomm.com> <20260806131715.508557-1-p.zabel@pengutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Replace regmap_read/regmap_write() pairs with regmap_write_bits(). Signed-off-by: Philipp Zabel Tested-by: Philipp Zabel --- drivers/gpu/drm/bridge/lontium-lt9211.c | 18 +++--------------- 1 file changed, 3 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/brid= ge/lontium-lt9211.c index bf72d1bcdb48..9888119f5287 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9211.c +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c @@ -589,11 +589,7 @@ static int lt9211c_configure_rx(struct lt9211 *ctx) if (ret) return ret; =20 - ret =3D regmap_read(ctx->regmap, 0x8180, &pval); - if (ret) - return ret; - - ret =3D regmap_write(ctx->regmap, 0x8180, ((pval & 0xfc) | 0x03)); + ret =3D regmap_write_bits(ctx->regmap, 0x8180, 0x3, 0x3); if (ret) return ret; =20 @@ -609,11 +605,7 @@ static int lt9211c_configure_rx(struct lt9211 *ctx) if (ret) return ret; =20 - ret =3D regmap_read(ctx->regmap, 0x8530, &pval); - if (ret) - return ret; - - ret =3D regmap_write(ctx->regmap, 0x8530, ((pval & 0xf8) | 0x11)); + ret =3D regmap_write_bits(ctx->regmap, 0x8530, 0x17, 0x11); if (ret) return ret; =20 @@ -998,11 +990,7 @@ static int lt9211c_configure_tx(struct lt9211 *ctx, bo= ol jeida, bool bpp24, if (ret) return ret; =20 - ret =3D regmap_read(ctx->regmap, 0x8530, &pval); - if (ret) - return ret; - - ret =3D regmap_write(ctx->regmap, 0x8530, ((pval & 0x3f) | 0x40)); + ret =3D regmap_write_bits(ctx->regmap, 0x8530, 0xc0, 0x40); if (ret) return ret; =20 --=20 2.47.3 From nobody Fri Oct 2 01:12:58 2026 Received: from mx1.white.stw.pengutronix.de (mx1.white.stw.pengutronix.de [185.203.200.13]) (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 5FE6A2EA480; Thu, 6 Aug 2026 13:17:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.200.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022256; cv=none; b=GiTWXG3bPJBmSOH2s3pkQ2QJNO177fjYsQQgIUfhx0uImLbbPIVBIRoUteOUM8z0UOG5ToDCogTmZPnfpmoUcq/B0ivtcOBNdJzIeJBT4sIM2X1x9jR/3iZEYhGzsr8ET6qKwse+upyF0KqSfyaYBsotrIHQvwcZzm1a7ujZdVk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022256; c=relaxed/simple; bh=9kAKX6QmzIobSHh/IOSHYRg+BagTvxHzgngL0+4Upjw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ULsYWUtTVgjPcCKBPa9PTpi0YAlSHHoEQXiaxUY+eFocN2VA7jljvIgrH1LJznlgrkg98ITpbxMZXu0TJOLz7olNF0PJFTRcErf04MoABpSo1EYLQ+K+GmPRz0OVaEUWuVP994q7Xo15MjzQCYCvH/eouyBvzKBbjRLV/zW3bVk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.200.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de (drehscheibe.grey.stw.pengutronix.de [IPv6:2a0a:edc0:0:c01:1d::a2]) (Authenticated sender: relay-from-drehscheibe.grey.stw.pengutronix.de) by mx1.white.stw.pengutronix.de (Postfix) with ESMTPSA id 409A6202107; Thu, 06 Aug 2026 15:17:26 +0200 (CEST) Received: from dude05.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::54]) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1wrxyQ-000664-0U; Thu, 06 Aug 2026 15:17:26 +0200 From: Philipp Zabel To: Vishnu Saini , Yi Zhang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Nilesh Laad , Gopi Botlagunta , venkata.valluru@oss.qualcomm.com, Jessica Zhang , Philipp Zabel Subject: [PATCH 4/7] drm/bridge: lt9211: reuse lt9211_configure_timing in lt9211c_configure_timing Date: Thu, 6 Aug 2026 15:17:12 +0200 Message-ID: <20260806131715.508557-5-p.zabel@pengutronix.de> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260806131715.508557-1-p.zabel@pengutronix.de> References: <20260719-add-lt9211c-bridge-v6-2-e56d22152586@oss.qualcomm.com> <20260806131715.508557-1-p.zabel@pengutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Reuse lt9211_configure_timing() in lt9211c_configure_timing(). Signed-off-by: Philipp Zabel Tested-by: Philipp Zabel --- drivers/gpu/drm/bridge/lontium-lt9211.c | 26 +++++++------------------ 1 file changed, 7 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/brid= ge/lontium-lt9211.c index 9888119f5287..5e5601551658 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9211.c +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c @@ -689,26 +689,14 @@ static int lt9211c_autodetect_rx(struct lt9211 *ctx, static int lt9211c_configure_timing(struct lt9211 *ctx, const struct drm_display_mode *mode) { - const struct reg_sequence lt9211c_timing[] =3D { - { 0xd00d, (mode->vtotal >> 8) & 0xff }, - { 0xd00e, mode->vtotal & 0xff }, - { 0xd00f, (mode->vdisplay >> 8) & 0xff }, - { 0xd010, mode->vdisplay & 0xff }, - { 0xd011, (mode->htotal >> 8) & 0xff }, - { 0xd012, mode->htotal & 0xff }, - { 0xd013, (mode->hdisplay >> 8) & 0xff }, - { 0xd014, mode->hdisplay & 0xff }, - { 0xd015, (mode->vsync_end - mode->vsync_start) & 0xff }, - { 0xd04c, ((mode->hsync_end - mode->hsync_start) >> 8) & 0xff }, - { 0xd016, (mode->hsync_end - mode->hsync_start) & 0xff }, - { 0xd017, ((mode->vsync_start - mode->vdisplay) >> 8) & 0xff }, - { 0xd018, (mode->vsync_start - mode->vdisplay) & 0xff }, - { 0xd019, ((mode->hsync_start - mode->hdisplay) >> 8) & 0xff }, - { 0xd01a, (mode->hsync_start - mode->hdisplay) & 0xff }, - }; + int ret; =20 - return regmap_multi_reg_write(ctx->regmap, lt9211c_timing, - ARRAY_SIZE(lt9211c_timing)); + ret =3D lt9211_configure_timing(ctx, mode); + if (ret < 0) + return ret; + + return regmap_write(ctx->regmap, 0xd04c, + ((mode->hsync_end - mode->hsync_start) >> 8) & 0xff); } =20 static int lt9211c_configure_plls(struct lt9211 *ctx, --=20 2.47.3 From nobody Fri Oct 2 01:12:58 2026 Received: from mx1.white.stw.pengutronix.de (mx1.white.stw.pengutronix.de [185.203.200.13]) (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 80F92137923; Thu, 6 Aug 2026 13:17:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.200.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022263; cv=none; b=flUsBTOQXT+XhxMfU4j+sUHD03cRVbY+tJaml3IgmfbGG8WAQbkA6dJVsvbPS8gjZVs6FtEhT3bqI4vC/zOPCxmuX91NUSyZ6AVxZx5WeSOA1uGISOZxi+bMDWQH8B5YWCTiaXzz0U3s1yYP02YaVuTW8J//ep193xZazJiEquM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022263; c=relaxed/simple; bh=NjoYzYoJpK0n170py9EhMhQQr1rTjRMeYddlAE3lJGg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Aq4L2va6SX5jeYL1KfIMyb+3N1+PluWcwzBhRmsXbpJOTfNDUbbOdfyHua8szCQeFmx737trCPOs7tYH9jl8Ls0MxdynlmgD5C6+YOIP8MPR8T9XFaqTkRWYBaZ8StXV9h2yD+sRlWouG0Foy4j0rlBXpw8Js0Zc/XZXtYumDnY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.200.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de (drehscheibe.grey.stw.pengutronix.de [IPv6:2a0a:edc0:0:c01:1d::a2]) (Authenticated sender: relay-from-drehscheibe.grey.stw.pengutronix.de) by mx1.white.stw.pengutronix.de (Postfix) with ESMTPSA id C25D0200FDB; Thu, 06 Aug 2026 15:17:26 +0200 (CEST) Received: from dude05.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::54]) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1wrxyQ-000664-2C; Thu, 06 Aug 2026 15:17:26 +0200 From: Philipp Zabel To: Vishnu Saini , Yi Zhang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Nilesh Laad , Gopi Botlagunta , venkata.valluru@oss.qualcomm.com, Jessica Zhang , Philipp Zabel Subject: [PATCH 5/7] drm/bridge: lt9211: combine equal branches Date: Thu, 6 Aug 2026 15:17:13 +0200 Message-ID: <20260806131715.508557-6-p.zabel@pengutronix.de> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260806131715.508557-1-p.zabel@pengutronix.de> References: <20260719-add-lt9211c-bridge-v6-2-e56d22152586@oss.qualcomm.com> <20260806131715.508557-1-p.zabel@pengutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Combine two branches that set the predivider to the same value. Signed-off-by: Philipp Zabel Tested-by: Philipp Zabel --- drivers/gpu/drm/bridge/lontium-lt9211.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/brid= ge/lontium-lt9211.c index 5e5601551658..14afffcb2e4a 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9211.c +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c @@ -993,10 +993,7 @@ static int lt9211c_configure_tx(struct lt9211 *ctx, bo= ol jeida, bool bpp24, phy_clk =3D (u32)(mode->clock * 7); =20 /* 0x8231: prediv sel */ - if (mode->clock < 20000) { - val =3D 0x28; - pre_div =3D 1; - } else if (mode->clock < 40000) { + if (mode->clock < 40000) { val =3D 0x28; pre_div =3D 1; } else if (mode->clock < 80000) { --=20 2.47.3 From nobody Fri Oct 2 01:12:58 2026 Received: from mx1.white.stw.pengutronix.de (mx1.white.stw.pengutronix.de [185.203.200.13]) (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 5CCD13164B4; Thu, 6 Aug 2026 13:17:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.200.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022259; cv=none; b=Y9d+6hmct5ERaf4kP8gQN8St+niXo0xMqGVbZxpOP2pznYCNdAiX1s51YiP2H1Y60QUBnhP3Fhf/mPGww64nIel8RvphN84gPZzkTbyPrzKYizFz6iubyK4Y7nL4MMrIh2+PFiPP1YyQ5eZfbvwUU37kGis59gEhoS7LZ7zIKaU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022259; c=relaxed/simple; bh=caIjhG3XoWd4tVHzFK5oN/nmcRDnSQEfRNRQ37jBHm4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Qrm+gX/Qxo7kdo/qx3fw0zQ6+b3dkl9ILKTxuMyvv7GTQkhUYX2vRRwNQPTf0CviEiyFwtaBILroqBhwqH7xnZpj01YhohsMCFOt3OE+9xRp3pFYu68MR/MIbSP8xdupuVshR1QsgUKJipqXPFe/nOkesLFNenWrzro5OvmTRjM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.200.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de (drehscheibe.grey.stw.pengutronix.de [IPv6:2a0a:edc0:0:c01:1d::a2]) (Authenticated sender: relay-from-drehscheibe.grey.stw.pengutronix.de) by mx1.white.stw.pengutronix.de (Postfix) with ESMTPSA id 5A76720210F; Thu, 06 Aug 2026 15:17:27 +0200 (CEST) Received: from dude05.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::54]) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1wrxyR-000664-0h; Thu, 06 Aug 2026 15:17:27 +0200 From: Philipp Zabel To: Vishnu Saini , Yi Zhang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Nilesh Laad , Gopi Botlagunta , venkata.valluru@oss.qualcomm.com, Jessica Zhang , Philipp Zabel Subject: [PATCH 6/7] drm/bridge: lt9211: use devm_drm_bridge_add and drop lt9211_remove Date: Thu, 6 Aug 2026 15:17:14 +0200 Message-ID: <20260806131715.508557-7-p.zabel@pengutronix.de> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260806131715.508557-1-p.zabel@pengutronix.de> References: <20260719-add-lt9211c-bridge-v6-2-e56d22152586@oss.qualcomm.com> <20260806131715.508557-1-p.zabel@pengutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use devm_drm_bridge_add() and remove the need to call drm_bridge_remove() manually. Drop the empty lt9211_remove(). Signed-off-by: Philipp Zabel Tested-by: Philipp Zabel --- drivers/gpu/drm/bridge/lontium-lt9211.c | 19 +++---------------- 1 file changed, 3 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/brid= ge/lontium-lt9211.c index 14afffcb2e4a..c82f7ee7134c 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9211.c +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c @@ -1456,24 +1456,12 @@ static int lt9211_probe(struct i2c_client *client) if (IS_ERR(ctx->regmap)) return PTR_ERR(ctx->regmap); =20 - dev_set_drvdata(dev, ctx); - i2c_set_clientdata(client, ctx); - ctx->bridge.of_node =3D dev->of_node; - drm_bridge_add(&ctx->bridge); - - ret =3D lt9211_host_attach(ctx); + ret =3D devm_drm_bridge_add(dev, &ctx->bridge); if (ret) - drm_bridge_remove(&ctx->bridge); + return ret; =20 - return ret; -} - -static void lt9211_remove(struct i2c_client *client) -{ - struct lt9211 *ctx =3D i2c_get_clientdata(client); - - drm_bridge_remove(&ctx->bridge); + return lt9211_host_attach(ctx); } =20 static const struct i2c_device_id lt9211_id[] =3D { @@ -1492,7 +1480,6 @@ MODULE_DEVICE_TABLE(of, lt9211_match_table); =20 static struct i2c_driver lt9211_driver =3D { .probe =3D lt9211_probe, - .remove =3D lt9211_remove, .id_table =3D lt9211_id, .driver =3D { .name =3D "lt9211", --=20 2.47.3 From nobody Fri Oct 2 01:12:58 2026 Received: from mx1.white.stw.pengutronix.de (mx1.white.stw.pengutronix.de [185.203.200.13]) (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 C27E0330B32; Thu, 6 Aug 2026 13:17:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.200.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022261; cv=none; b=YZwcVp0dv19xLgNcvoqIIkiBH1zV1Pdzwwqqd5QDDoy3p7qsMykQC2nAmmUf/zj4+p98195QqDslkA7drj6SRxmR96PB3JbwDtPfWsjAOyGIPjH6jgWPyDtpvtJetsjMciXFVrXUKUeB/hiLg30O7OPoIoIjqsCBegcZ308kTV4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786022261; c=relaxed/simple; bh=n5B9tVKJ9XbAPRDOXrC5ulZ3YFXjS2zIeKx4NxRxJFM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=M8qjDMiukRsaNzLTy19T0bT+J/LJ2Gerte4mgdeSVoa/HPj2xxKUnhL+6Y3W8zDZeoS74S5rMwaqxKZIbHSsrx3tEtArxjqW0fSIKDMcXsmqWVQABrGY+q6+MVpd4bkr04clPi0c9eRW6emP3SVONRIhQX2CAvpkFcDnIaRD0RQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.200.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de (drehscheibe.grey.stw.pengutronix.de [IPv6:2a0a:edc0:0:c01:1d::a2]) (Authenticated sender: relay-from-drehscheibe.grey.stw.pengutronix.de) by mx1.white.stw.pengutronix.de (Postfix) with ESMTPSA id D1CC4202122; Thu, 06 Aug 2026 15:17:27 +0200 (CEST) Received: from dude05.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::54]) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1wrxyR-000664-2V; Thu, 06 Aug 2026 15:17:27 +0200 From: Philipp Zabel To: Vishnu Saini , Yi Zhang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Nilesh Laad , Gopi Botlagunta , venkata.valluru@oss.qualcomm.com, Jessica Zhang , Oleksij Rempel , Philipp Zabel Subject: [PATCH 7/7] drm/bridge: lt9211: Enable DSI burst mode for LT9211C Date: Thu, 6 Aug 2026 15:17:15 +0200 Message-ID: <20260806131715.508557-8-p.zabel@pengutronix.de> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260806131715.508557-1-p.zabel@pengutronix.de> References: <20260719-add-lt9211c-bridge-v6-2-e56d22152586@oss.qualcomm.com> <20260806131715.508557-1-p.zabel@pengutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Oleksij Rempel Enable the MIPI_DSI_MODE_VIDEO_BURST flag to produce stable LVDS output on RK3576. In non-burst mode, the bridge produces a horizontally unstable image on this platform. Tested with: AUO G185HAN01.0 dual-link LVDS panel via LT9211C bridge Signed-off-by: Oleksij Rempel Signed-off-by: Philipp Zabel Tested-by: Philipp Zabel --- drivers/gpu/drm/bridge/lontium-lt9211.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/brid= ge/lontium-lt9211.c index c82f7ee7134c..e34ee288e466 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9211.c +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c @@ -1399,7 +1399,8 @@ static int lt9211_host_attach(struct lt9211 *ctx) dsi->format =3D MIPI_DSI_FMT_RGB888; =20 if (ctx->chip_type =3D=3D LT9211C) { - dsi->mode_flags =3D MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM; + dsi->mode_flags =3D MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | + MIPI_DSI_MODE_LPM; } else { dsi->mode_flags =3D MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE | --=20 2.47.3