From nobody Sat Jun 13 19:04:11 2026 Received: from out198-21.us.a.mail.aliyun.com (out198-21.us.a.mail.aliyun.com [47.90.198.21]) (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 C4D6C27FD49; Wed, 6 May 2026 01:47:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=47.90.198.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778032079; cv=none; b=cA3qjhJc4x94fWeq0xS9tGzrqS2+EtY3OPeGqlbJkeX9f/DNOJ/NqJSdOYblR24+EOiE1FpNHeoLL5VhLPdJEeRL/jkTBqkJKIuwhsGKmWWhz1XSL3Wz9nK4fDRKv0UkT6ACB2hqE/IsGnX1FjDkNl8LRQQ/jI2gXz+spNfCP8E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778032079; c=relaxed/simple; bh=p0urNjm41sZeAN6q7Acv0PPrW6hXjInS+UEK+XxkjEc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=NKOWYhPsa7dHAdmtthU6OYORpNSdpYZqRfruK4y6l+qSlzlMj0X26r6Sz5GjtkaPgasmtR72e7HSq6Xr6WXP3UyhGLk3kEyYQHAyfYM7NVj9WfBPKIvFxxCVeEWodF9l/EMT7AAxTbaW7M3LoAcR/Tdi9HBCQtDdl8xeXSG05jY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lontium.com; spf=pass smtp.mailfrom=lontium.com; dkim=pass (2048-bit key) header.d=lontium.com header.i=@lontium.com header.b=V4dmwTtt; arc=none smtp.client-ip=47.90.198.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lontium.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lontium.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lontium.com header.i=@lontium.com header.b="V4dmwTtt" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lontium.com; s=default; t=1778032064; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=po4JbBzlVnZWMf/PF4TZcy9SSjh11o50cvR1wsP/N14=; b=V4dmwTtt0oN1F9o9dsUpvtMLJyrDQ9GdcSumgwp4W4JG/+ujHwVuQlyZYQ8bVFEHK5N8A66lFS8PEag6GRS64hQ72Ql09Yyd3uXOXVNUoJ/7KF6zIhTtpmu06mMYWh+9E5J4AijdkKILijijcYQNKDDuqNTL8lMtjFMEMNyN3ACJHA9q1YFAQA0X+M0zXkxHOP1+eruU0VhVIySgCzI32FplxND+SooAPyR8T5b3QxxdSUBDi1ioMbJDjYn46M23sA/obFBEuEDF8mobZvi/awcHvt32WowKtM/KKHvZyRrmkhFTp812kEipfrlAvTdzvd8zwcG52Rw3+ouUuMeyBQ== X-Alimail-AntiSpam: AC=CONTINUE;BC=0.09618295|-1;BR=01201311R661ec;CH=green;DM=|CONTINUE|false|;DS=SPAM|spam_ad|0.867174-0.00121929-0.131607;FP=12538499638350538034|0|0|0|0|-1|-1|-1;HT=maildocker-contentspam033045220102;MF=syyang@lontium.com;NM=1;PH=DS;RN=23;RT=23;SR=0;TI=SMTPD_---.hQNamk6_1778031116; Received: from DESKTOP-V2MKAT2.localdomain(mailfrom:syyang@lontium.com fp:SMTPD_---.hQNamk6_1778031116 cluster:ay29) by smtp.aliyun-inc.com; Wed, 06 May 2026 09:31:59 +0800 From: syyang@lontium.com To: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, andrzej.hajda@intel.com, neil.armstrong@linaro.org, dmitry.baryshkov@oss.qualcomm.com, maarten.lankhorst@linux.intel.com, rfoss@kernel.org, mripard@kernel.org Cc: Laurent.pinchart@ideasonboard.com, tzimmermann@suse.de, jonas@kwiboo.se, jernej.skrabec@gmail.com, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, yangsunyun1993@gmail.com, xmzhu@lontium.corp-partner.google.com, xmzhu@lontium.com, rlyu@lontium.com, xbpeng@lontium.com, Sunyun Yang , Krzysztof Kozlowski Subject: [PATCH v5 1/2] dt-bindings: bridge: Add Lontium LT7911EXC eDP to MIPI DSI bridge Date: Wed, 6 May 2026 09:31:52 +0800 Message-Id: <20260506013153.2240-2-syyang@lontium.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260506013153.2240-1-syyang@lontium.com> References: <20260506013153.2240-1-syyang@lontium.com> 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: Sunyun Yang The LT7911EXC is an I2C-controlled bridge that Receiver eDP1.4 and output signal/dual port mipi dsi. Signed-off-by: Sunyun Yang Reviewed-by: Krzysztof Kozlowski --- .../display/bridge/lontium,lt7911exc.yaml | 89 +++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/bridge/lontiu= m,lt7911exc.yaml diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt791= 1exc.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt7911= exc.yaml new file mode 100644 index 000000000000..3290b10ce883 --- /dev/null +++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt7911exc.ya= ml @@ -0,0 +1,89 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/bridge/lontium,lt7911exc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Lontium LT7911EXC eDP to MIPI DSI Bridge + +maintainers: + - Sunyun Yang + +properties: + compatible: + enum: + - lontium,lt7911exc + + reg: + maxItems: 1 + + reset-gpios: + maxItems: 1 + description: GPIO connected to RST_ pin. + + vdd-supply: + description: Regulator for 1.2V MIPI phy power. + + vcc-supply: + description: Regulator for 3.3V IO power. + + ports: + $ref: /schemas/graph.yaml#/properties/ports + + properties: + port@0: + $ref: /schemas/graph.yaml#/properties/port + description: Video port for eDP input. + + port@1: + $ref: /schemas/graph.yaml#/properties/port + description: Video port for MIPI DSI output. + + required: + - port@0 + - port@1 + +required: + - compatible + - reg + - reset-gpios + - vdd-supply + - vcc-supply + - ports + +additionalProperties: false + +examples: + - | + #include + i2c { + #address-cells =3D <1>; + #size-cells =3D <0>; + + mipi-bridge@41 { + compatible =3D "lontium,lt7911exc"; + reg =3D <0x41>; + reset-gpios =3D <&gpy8 8 GPIO_ACTIVE_LOW>; + vdd-supply =3D <<7911exc_1v2>; + vcc-supply =3D <<7911exc_3v3>; + + ports { + #address-cells =3D <1>; + #size-cells =3D <0>; + + port@0 { + reg =3D <0>; + bridge_in: endpoint { + remote-endpoint =3D <&edp_out>; + }; + }; + + port@1 { + reg =3D <1>; + bridge_out: endpoint { + remote-endpoint =3D <&panel_in>; + }; + }; + }; + }; + }; --=20 2.34.1 From nobody Sat Jun 13 19:04:11 2026 Received: from out28-220.mail.aliyun.com (out28-220.mail.aliyun.com [115.124.28.220]) (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 B135913AF2; Wed, 6 May 2026 01:32:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.28.220 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778031134; cv=none; 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Received: from DESKTOP-V2MKAT2.localdomain(mailfrom:syyang@lontium.com fp:SMTPD_---.hQNamnX_1778031119 cluster:ay29) by smtp.aliyun-inc.com; Wed, 06 May 2026 09:32:01 +0800 From: syyang@lontium.com To: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, andrzej.hajda@intel.com, neil.armstrong@linaro.org, dmitry.baryshkov@oss.qualcomm.com, maarten.lankhorst@linux.intel.com, rfoss@kernel.org, mripard@kernel.org Cc: Laurent.pinchart@ideasonboard.com, tzimmermann@suse.de, jonas@kwiboo.se, jernej.skrabec@gmail.com, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, yangsunyun1993@gmail.com, xmzhu@lontium.corp-partner.google.com, xmzhu@lontium.com, rlyu@lontium.com, xbpeng@lontium.com, Sunyun Yang Subject: [PATCH v5 2/2] drm/bridge: Add Lontium LT7911EXC eDP to MIPI DSI bridge Date: Wed, 6 May 2026 09:31:53 +0800 Message-Id: <20260506013153.2240-3-syyang@lontium.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260506013153.2240-1-syyang@lontium.com> References: <20260506013153.2240-1-syyang@lontium.com> 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: Sunyun Yang The LT7911EXC is an I2C-controlled bridge that Receiver eDP1.4 and output signal/dual port mipi dsi. Signed-off-by: Sunyun Yang Reviewed-by: Dmitry Baryshkov --- drivers/gpu/drm/bridge/Kconfig | 13 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/lontium-lt7911exc.c | 493 +++++++++++++++++++++ 3 files changed, 507 insertions(+) create mode 100644 drivers/gpu/drm/bridge/lontium-lt7911exc.c diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index c3209b0f4678..fe45a9052aa0 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -132,6 +132,19 @@ config DRM_ITE_IT6505 help ITE IT6505 DisplayPort bridge chip driver. =20 +config DRM_LONTIUM_LT7911EXC + tristate "Lontium eDP/MIPI DSI bridge" + depends on OF + select CRC32 + select FW_LOADER + select DRM_PANEL + select DRM_KMS_HELPER + help + DRM driver for the Lontium LT7911EXC bridge chip. + The LT7911EXC converts eDP input to single/dual port + MIPI DSI output. + Please say Y if you have such hardware. + config DRM_LONTIUM_LT8912B tristate "Lontium LT8912B DSI/HDMI bridge" depends on OF diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makef= ile index beab5b695a6e..70ddca75dd3a 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_DRM_I2C_NXP_TDA998X) +=3D tda998x.o obj-$(CONFIG_DRM_INNO_HDMI) +=3D inno-hdmi.o obj-$(CONFIG_DRM_ITE_IT6263) +=3D ite-it6263.o obj-$(CONFIG_DRM_ITE_IT6505) +=3D ite-it6505.o +obj-$(CONFIG_DRM_LONTIUM_LT7911EXC) +=3D lontium-lt7911exc.o obj-$(CONFIG_DRM_LONTIUM_LT8912B) +=3D lontium-lt8912b.o obj-$(CONFIG_DRM_LONTIUM_LT9211) +=3D lontium-lt9211.o obj-$(CONFIG_DRM_LONTIUM_LT9611) +=3D lontium-lt9611.o diff --git a/drivers/gpu/drm/bridge/lontium-lt7911exc.c b/drivers/gpu/drm/b= ridge/lontium-lt7911exc.c new file mode 100644 index 000000000000..02648b396343 --- /dev/null +++ b/drivers/gpu/drm/bridge/lontium-lt7911exc.c @@ -0,0 +1,493 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2026 Lontium Semiconductor, Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define FW_SIZE (64 * 1024) +#define LT_PAGE_SIZE 32 +#define FW_FILE "lt7911exc_fw.bin" +#define LT7911EXC_PAGE_CONTROL 0xff + +struct lt7911exc { + struct device *dev; + struct i2c_client *client; + struct drm_bridge bridge; + struct regmap *regmap; + /* Protects all accesses to registers by stopping the on-chip MCU */ + struct mutex ocm_lock; + struct regulator_bulk_data supplies[2]; + struct gpio_desc *reset_gpio; + int fw_version; +}; + +static const struct regmap_range_cfg lt7911exc_ranges[] =3D { + { + .name =3D "register_range", + .range_min =3D 0, + .range_max =3D 0xe8ff, + .selector_reg =3D LT7911EXC_PAGE_CONTROL, + .selector_mask =3D 0xff, + .selector_shift =3D 0, + .window_start =3D 0, + .window_len =3D 0x100, + }, +}; + +static const struct regmap_config lt7911exc_regmap_config =3D { + .reg_bits =3D 8, + .val_bits =3D 8, + .max_register =3D 0xe8ff, + .ranges =3D lt7911exc_ranges, + .num_ranges =3D ARRAY_SIZE(lt7911exc_ranges), +}; + +static u32 cal_crc32_custom(const u8 *data, u64 length) +{ + u32 crc =3D 0xffffffff; + u8 buf[4]; + u64 i; + + for (i =3D 0; i < length; i +=3D 4) { + buf[0] =3D data[i + 3]; + buf[1] =3D data[i + 2]; + buf[2] =3D data[i + 1]; + buf[3] =3D data[i + 0]; + crc =3D crc32_be(crc, buf, 4); + } + + return crc; +} + +static inline struct lt7911exc *bridge_to_lt7911exc(struct drm_bridge *bri= dge) +{ + return container_of(bridge, struct lt7911exc, bridge); +} + +static void lt7911exc_reset(struct lt7911exc *lt7911exc) +{ + gpiod_set_value_cansleep(lt7911exc->reset_gpio, 0); + msleep(20); + + gpiod_set_value_cansleep(lt7911exc->reset_gpio, 1); + msleep(20); + + gpiod_set_value_cansleep(lt7911exc->reset_gpio, 0); + msleep(400); + + dev_dbg(lt7911exc->dev, "lt7911exc reset.\n"); +} + +static int lt7911exc_parse_dt(struct lt7911exc *lt7911exc) +{ + struct device *dev =3D lt7911exc->dev; + int ret; + + lt7911exc->supplies[0].supply =3D "vcc"; + lt7911exc->supplies[1].supply =3D "vdd"; + + ret =3D devm_regulator_bulk_get(dev, 2, lt7911exc->supplies); + if (ret) + return dev_err_probe(dev, ret, "failed get regulator\n"); + + lt7911exc->reset_gpio =3D devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(lt7911exc->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(lt7911exc->reset_gpio), + "failed to acquire reset gpio\n"); + + return 0; +} + +static int lt7911exc_read_version(struct lt7911exc *lt7911exc) +{ + u8 buf[3]; + int ret; + + ret =3D regmap_write(lt7911exc->regmap, 0xe0ee, 0x01); + if (ret) + return ret; + ret =3D regmap_bulk_read(lt7911exc->regmap, 0xe081, buf, sizeof(buf)); + if (ret) + return ret; + + return (buf[0] << 16) | (buf[1] << 8) | buf[2]; +} + +static void lt7911exc_lock(struct lt7911exc *lt7911exc) +{ + mutex_lock(<7911exc->ocm_lock); + regmap_write(lt7911exc->regmap, 0xe0ee, 0x01); +} + +static void lt7911exc_unlock(struct lt7911exc *lt7911exc) +{ + regmap_write(lt7911exc->regmap, 0xe0ee, 0x00); + mutex_unlock(<7911exc->ocm_lock); +} + +static void lt7911exc_block_erase(struct lt7911exc *lt7911exc) +{ + struct device *dev =3D lt7911exc->dev; + const u32 addr =3D 0x00; + + const struct reg_sequence seq_write[] =3D { + REG_SEQ0(0xe0ee, 0x01), + REG_SEQ0(0xe054, 0x01), + REG_SEQ0(0xe055, 0x06), + REG_SEQ0(0xe051, 0x01), + REG_SEQ0(0xe051, 0x00), + REG_SEQ0(0xe054, 0x05), + REG_SEQ0(0xe055, 0xd8), + REG_SEQ0(0xe05a, (addr >> 16) & 0xff), + REG_SEQ0(0xe05b, (addr >> 8) & 0xff), + REG_SEQ0(0xe05c, addr & 0xff), + REG_SEQ0(0xe051, 0x01), + REG_SEQ0(0xe050, 0x00), + }; + + regmap_multi_reg_write(lt7911exc->regmap, seq_write, ARRAY_SIZE(seq_write= )); + + msleep(200); + dev_dbg(dev, "erase flash done.\n"); +} + +static void lt7911exc_prog_init(struct lt7911exc *lt7911exc, u64 addr) +{ + const struct reg_sequence seq_write[] =3D { + REG_SEQ0(0xe0ee, 0x01), + REG_SEQ0(0xe05f, 0x01), + REG_SEQ0(0xe05a, (addr >> 16) & 0xff), + REG_SEQ0(0xe05b, (addr >> 8) & 0xff), + REG_SEQ0(0xe05c, addr & 0xff), + }; + + regmap_multi_reg_write(lt7911exc->regmap, seq_write, ARRAY_SIZE(seq_write= )); +} + +static int lt7911exc_write_data(struct lt7911exc *lt7911exc, const struct = firmware *fw, u64 addr) +{ + struct device *dev =3D lt7911exc->dev; + int ret; + int page =3D 0, num =3D 0, page_len =3D 0; + u64 size, offset; + const u8 *data; + + data =3D fw->data; + size =3D fw->size; + page =3D (size + LT_PAGE_SIZE - 1) / LT_PAGE_SIZE; + if (page * LT_PAGE_SIZE > FW_SIZE) { + dev_err(dev, "firmware size out of range\n"); + return -EINVAL; + } + + dev_dbg(dev, "%u pages, total size %llu byte\n", page, size); + + for (num =3D 0; num < page; num++) { + offset =3D num * LT_PAGE_SIZE; + page_len =3D (offset + LT_PAGE_SIZE <=3D size) ? LT_PAGE_SIZE : (size - = offset); + lt7911exc_prog_init(lt7911exc, addr); + + ret =3D regmap_raw_write(lt7911exc->regmap, 0xe05d, &data[offset], page_= len); + if (ret) { + dev_err(dev, "write error at page %d\n", num); + return ret; + } + + if (page_len < LT_PAGE_SIZE) { + regmap_write(lt7911exc->regmap, 0xe05f, 0x05); + regmap_write(lt7911exc->regmap, 0xe05f, 0x01); + //hardware requires delay + usleep_range(1000, 2000); + } + + regmap_write(lt7911exc->regmap, 0xe05f, 0x00); + addr +=3D LT_PAGE_SIZE; + } + + return 0; +} + +static int lt7911exc_write_crc(struct lt7911exc *lt7911exc, u32 crc32, u64= addr) +{ + u8 crc[4]; + int ret; + + crc[0] =3D crc32 & 0xff; + crc[1] =3D (crc32 >> 8) & 0xff; + crc[2] =3D (crc32 >> 16) & 0xff; + crc[3] =3D (crc32 >> 24) & 0xff; + + regmap_write(lt7911exc->regmap, 0xe05f, 0x01); + regmap_write(lt7911exc->regmap, 0xe05a, (addr >> 16) & 0xff); + regmap_write(lt7911exc->regmap, 0xe05b, (addr >> 8) & 0xff); + regmap_write(lt7911exc->regmap, 0xe05c, addr & 0xff); + + ret =3D regmap_raw_write(lt7911exc->regmap, 0xe05d, crc, 4); + if (ret) + return ret; + + regmap_write(lt7911exc->regmap, 0xe05f, 0x05); + regmap_write(lt7911exc->regmap, 0xe05f, 0x01); + usleep_range(1000, 2000); + regmap_write(lt7911exc->regmap, 0xe05f, 0x00); + + return 0; +} + +static int lt7911exc_upgrade_result(struct lt7911exc *lt7911exc, u32 crc32) +{ + struct device *dev =3D lt7911exc->dev; + u32 read_hw_crc =3D 0; + u8 crc_tmp[4]; + int ret; + + regmap_write(lt7911exc->regmap, 0xe0ee, 0x01); + regmap_write(lt7911exc->regmap, 0xe07b, 0x60); + regmap_write(lt7911exc->regmap, 0xe07b, 0x40); + msleep(150); + ret =3D regmap_bulk_read(lt7911exc->regmap, 0x22, crc_tmp, 4); + if (ret) { + dev_err(lt7911exc->dev, "Failed to read CRC: %d\n", ret); + return ret; + } + + read_hw_crc =3D crc_tmp[0] << 24 | crc_tmp[1] << 16 | + crc_tmp[2] << 8 | crc_tmp[3]; + + if (read_hw_crc !=3D crc32) { + dev_err(dev, "lt7911exc firmware upgrade failed, expected CRC=3D0x%08x, = read CRC=3D0x%08x\n", + crc32, read_hw_crc); + return -EIO; + } + + dev_dbg(dev, "lt7911exc firmware upgrade success, CRC=3D0x%08x\n", read_h= w_crc); + return 0; +} + +static int lt7911exc_firmware_upgrade(struct lt7911exc *lt7911exc) +{ + struct device *dev =3D lt7911exc->dev; + const struct firmware *fw; + u8 *buffer; + size_t total_size =3D FW_SIZE - 4; + u32 crc32; + int ret; + + /*1. load firmware*/ + ret =3D request_firmware(&fw, FW_FILE, dev); + if (ret) + return dev_err_probe(dev, ret, "failed to load '%s'\n", FW_FILE); + + /*2. check size*/ + if (fw->size > total_size) { + dev_err(dev, "firmware too large (%zu > %zu)\n", fw->size, total_size); + ret =3D -EINVAL; + goto out_release_fw; + } + + /*3. calculate crc32 */ + buffer =3D kzalloc(total_size, GFP_KERNEL); + if (!buffer) { + ret =3D -ENOMEM; + goto out_release_fw; + } + memset(buffer, 0xff, total_size); + memcpy(buffer, fw->data, fw->size); + + crc32 =3D cal_crc32_custom(buffer, total_size); + kfree(buffer); + + /*4. firmware upgrade */ + dev_dbg(dev, "starting firmware upgrade, size: %zu bytes\n", fw->size); + + lt7911exc_block_erase(lt7911exc); + + ret =3D lt7911exc_write_data(lt7911exc, fw, 0); + if (ret < 0) { + dev_err(dev, "failed to write firmware data\n"); + goto out_release_fw; + } + + ret =3D lt7911exc_write_crc(lt7911exc, crc32, FW_SIZE - 4); + if (ret < 0) { + dev_err(dev, "failed to write firmware crc\n"); + goto out_release_fw; + } + + /*5. check upgrade of result*/ + lt7911exc_reset(lt7911exc); + + ret =3D lt7911exc_upgrade_result(lt7911exc, crc32); + +out_release_fw: + release_firmware(fw); + return ret; +} + +static void lt7911exc_atomic_pre_enable(struct drm_bridge *bridge, struct = drm_atomic_state *state) +{ + struct lt7911exc *lt7911exc =3D bridge_to_lt7911exc(bridge); + int ret; + + ret =3D regulator_bulk_enable(ARRAY_SIZE(lt7911exc->supplies), lt7911exc-= >supplies); + if (ret) + return; + + lt7911exc_reset(lt7911exc); +} + +static void lt7911exc_atomic_disable(struct drm_bridge *bridge, struct drm= _atomic_state *state) +{ + /* Delay after panel is disabled */ + msleep(20); +} + +static void lt7911exc_atomic_post_disable(struct drm_bridge *bridge, struc= t drm_atomic_state *state) +{ + struct lt7911exc *lt7911exc =3D bridge_to_lt7911exc(bridge); + int ret; + + ret =3D regulator_bulk_disable(ARRAY_SIZE(lt7911exc->supplies), lt7911exc= ->supplies); + if (ret) + return; + + gpiod_set_value_cansleep(lt7911exc->reset_gpio, 1); +} + +static int lt7911exc_attach(struct drm_bridge *bridge, + struct drm_encoder *encoder, + enum drm_bridge_attach_flags flags) +{ + struct lt7911exc *lt7911exc =3D bridge_to_lt7911exc(bridge); + + return drm_bridge_attach(lt7911exc->bridge.encoder, lt7911exc->bridge.nex= t_bridge, + <7911exc->bridge, flags); +} + +static const struct drm_bridge_funcs lt7911exc_bridge_funcs =3D { + .attach =3D lt7911exc_attach, + .atomic_pre_enable =3D lt7911exc_atomic_pre_enable, + .atomic_disable =3D lt7911exc_atomic_disable, + .atomic_post_disable =3D lt7911exc_atomic_post_disable, +}; + +static int lt7911exc_probe(struct i2c_client *client) +{ + struct device *dev =3D &client->dev; + struct lt7911exc *lt7911exc; + bool fw_updated =3D false; + int ret; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_err(dev, "device doesn't support I2C\n"); + return -ENODEV; + } + + lt7911exc =3D devm_drm_bridge_alloc(dev, struct lt7911exc, bridge, + <7911exc_bridge_funcs); + if (IS_ERR(lt7911exc)) + return dev_err_probe(dev, PTR_ERR(lt7911exc), "drm bridge alloc failed.\= n"); + + lt7911exc->bridge.next_bridge =3D devm_drm_of_get_bridge(dev, dev->of_nod= e, 1, 0); + if (IS_ERR(lt7911exc->bridge.next_bridge)) + return PTR_ERR(lt7911exc->bridge.next_bridge); + + lt7911exc->client =3D client; + lt7911exc->dev =3D dev; + i2c_set_clientdata(client, lt7911exc); + + ret =3D devm_mutex_init(dev, <7911exc->ocm_lock); + if (ret) + return dev_err_probe(dev, ret, "failed to init mutex\n"); + + lt7911exc->regmap =3D devm_regmap_init_i2c(client, <7911exc_regmap_conf= ig); + if (IS_ERR(lt7911exc->regmap)) + return dev_err_probe(dev, PTR_ERR(lt7911exc->regmap), "regmap i2c init f= ailed\n"); + + ret =3D lt7911exc_parse_dt(lt7911exc); + if (ret) + return ret; + + ret =3D regulator_bulk_enable(ARRAY_SIZE(lt7911exc->supplies), lt7911exc-= >supplies); + if (ret) + return ret; + + lt7911exc_reset(lt7911exc); + lt7911exc_lock(lt7911exc); + +retry: + lt7911exc->fw_version =3D lt7911exc_read_version(lt7911exc); + if (lt7911exc->fw_version < 0) { + dev_err(dev, "failed to read chip fw version\n"); + ret =3D -EOPNOTSUPP; + goto err_disable_regulators; + + } else if (lt7911exc->fw_version =3D=3D 0) { + if (!fw_updated) { + fw_updated =3D true; + ret =3D lt7911exc_firmware_upgrade(lt7911exc); + if (ret < 0) + goto err_disable_regulators; + + goto retry; + + } else { + dev_err(dev, "fw version 0x%04x, update failed\n", lt7911exc->fw_versio= n); + ret =3D -EOPNOTSUPP; + goto err_disable_regulators; + } + } + + lt7911exc_unlock(lt7911exc); + + lt7911exc->bridge.of_node =3D dev->of_node; + devm_drm_bridge_add(dev, <7911exc->bridge); + + return 0; + +err_disable_regulators: + lt7911exc_unlock(lt7911exc); + regulator_bulk_disable(ARRAY_SIZE(lt7911exc->supplies), lt7911exc->suppli= es); + return ret; +} + +static const struct i2c_device_id lt7911exc_i2c_table[] =3D { + {"lt7911exc"}, + {/* sentinel */} +}; + +MODULE_DEVICE_TABLE(i2c, lt7911exc_i2c_table); + +static const struct of_device_id lt7911exc_devices[] =3D { + {.compatible =3D "lontium,lt7911exc"}, + {/* sentinel */} +}; +MODULE_DEVICE_TABLE(of, lt7911exc_devices); + +static struct i2c_driver lt7911exc_driver =3D { + .id_table =3D lt7911exc_i2c_table, + .probe =3D lt7911exc_probe, + .driver =3D { + .name =3D "lt7911exc", + .of_match_table =3D lt7911exc_devices, + }, +}; +module_i2c_driver(lt7911exc_driver); + +MODULE_AUTHOR("SunYun Yang "); +MODULE_DESCRIPTION("Lontium LT7911EXC EDP to MIPI DSI bridge driver"); +MODULE_LICENSE("GPL"); +MODULE_FIRMWARE(FW_FILE); --=20 2.34.1