From patchwork Wed Aug 27 14:29:43 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ajay Kumar X-Patchwork-Id: 4788781 Return-Path: X-Original-To: patchwork-linux-samsung-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 12A2CC0338 for ; Wed, 27 Aug 2014 14:42:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 148CA200DE for ; Wed, 27 Aug 2014 14:42:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C9389200DB for ; Wed, 27 Aug 2014 14:42:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934741AbaH0OmN (ORCPT ); Wed, 27 Aug 2014 10:42:13 -0400 Received: from mailout3.samsung.com ([203.254.224.33]:18678 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933698AbaH0OmL (ORCPT ); Wed, 27 Aug 2014 10:42:11 -0400 Received: from epcpsbgr1.samsung.com (u141.gpu120.samsung.co.kr [203.254.230.141]) by mailout3.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NAY00I25ZIADP80@mailout3.samsung.com> for linux-samsung-soc@vger.kernel.org; Wed, 27 Aug 2014 23:42:10 +0900 (KST) Received: from epcpsbgm1.samsung.com ( [172.20.52.125]) by epcpsbgr1.samsung.com (EPCPMTA) with SMTP id 45.F0.02948.24EEDF35; Wed, 27 Aug 2014 23:42:10 +0900 (KST) X-AuditID: cbfee68d-f79c46d000000b84-9c-53fdee42370e Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id CB.F5.04943.14EEDF35; Wed, 27 Aug 2014 23:42:10 +0900 (KST) Received: from chromebld-server.sisodomain.com ([107.108.73.106]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0NAY00EVDZ3VVJ90@mmp1.samsung.com>; Wed, 27 Aug 2014 23:42:09 +0900 (KST) From: Ajay Kumar To: dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org Cc: inki.dae@samsung.com, thierry.reding@gmail.com, robdclark@gmail.com, daniel.vetter@ffwll.ch, seanpaul@google.com, ajaynumb@gmail.com, jg1.han@samsung.com, joshi@samsung.com, prashanth.g@samsung.com, Vincent Palatin , Andrew Bresticker , Sean Paul , Rahul Sharma , Ajay Kumar Subject: [PATCH V7 12/12] drm/bridge: Add i2c based driver for ps8622/ps8625 bridge Date: Wed, 27 Aug 2014 19:59:43 +0530 Message-id: <1409149783-12416-10-git-send-email-ajaykumar.rs@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1409149783-12416-1-git-send-email-ajaykumar.rs@samsung.com> References: <1409149783-12416-1-git-send-email-ajaykumar.rs@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupjkeLIzCtJLcpLzFFi42JZI2JSq+v07m+wwYqp/BYr3/9ltDjw/iCL xYY3C5ktFj68y2xx5et7NotJ9yewWFxeeInV4vuuL+wWM87vY7JYdXgDu8WURYdZLZ4v/MFs cXfDWUaLuQdzLX7umsdise3bHRYHAY/ZDRdZPPZ+W8DisXPWXXaPBZtKPe53H2fy6NuyitHj 8ya5APYoLpuU1JzMstQifbsEroxf/8oKHk5nrJh48w1rA+Ptqi5GTg4JAROJxVsOMkPYYhIX 7q1nA7GFBJYySmz/69jFyAFWs3keRxcjF1B4EaNE/4dJzBA1E5gkGk7ogNhsAtoS26bfZAGx RQTcJJoOz2QFaWAWmMUsMenXJEaQhLBAqMSiOd/AbBYBVYlztx6CNfAKeEqcfPaGBWKZgsSc STYgYU6g8MMd+1khdnlILHl8lQ1kpoTAW3aJBTc62SDmCEh8m3wIqldWYtMBqF8kJQ6uuMEy gVF4ASPDKkbR1ILkguKk9CJDveLE3OLSvHS95PzcTYzAaDr971nvDsbbB6wPMQpwMCrx8H5Y 8CdYiDWxrLgy9xCjKdCGicxSosn5wJjNK4k3NDYzsjA1MTU2Mrc0UxLnVZT6GSwkkJ5Ykpqd mlqQWhRfVJqTWnyIkYmDU6qBcY3OBd1nae6y9TeZhP6f9ox4du/Zioe6qZzKtbN6fsQ4a959 xvlIOfplwp/SiXIHtKMi5usJbKlgMtnH+qj9pN6fD0WRi7c2bPrHbKIgZHdrbkT+x3+BoUbm 0QIet55dPupvLss1Tz4gsWWZ7Mz1dlO+525MnxbdcdjAeKHy9wPerwwY1QvqlViKMxINtZiL ihMBuvYL1qECAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrBIsWRmVeSWpSXmKPExsVy+t9jAV2nd3+DDeaoWKx8/5fR4sD7gywW G94sZLZY+PAus8WVr+/ZLCbdn8BicXnhJVaL77u+sFvMOL+PyWLV4Q3sFlMWHWa1eL7wB7PF 3Q1nGS3mHsy1+LlrHovFtm93WBwEPGY3XGTx2PttAYvHzll32T0WbCr1uN99nMmjb8sqRo/P m+QC2KMaGG0yUhNTUosUUvOS81My89JtlbyD453jTc0MDHUNLS3MlRTyEnNTbZVcfAJ03TJz gG5XUihLzCkFCgUkFhcr6dthmhAa4qZrAdMYoesbEgTXY2SABhLWMGb8+ldW8HA6Y8XEm29Y GxhvV3UxcnBICJhIbJ7H0cXICWSKSVy4t56ti5GLQ0hgEaNE/4dJzCAJIYEJTBINJ3RAbDYB bYlt02+ygNgiAm4STYdnsoI0MAvMYpaY9GsSI0hCWCBUYtGcb2A2i4CqxLlbD8EaeAU8JU4+ e8MCsVhBYs4kG5AwJ1D44Y79rBC7PCSWPL7KNoGRdwEjwypG0dSC5ILipPRcQ73ixNzi0rx0 veT83E2M4Fh9JrWDcWWDxSFGAQ5GJR7ejwv+BAuxJpYVV+YeYpTgYFYS4S078DdYiDclsbIq tSg/vqg0J7X4EKMp0FETmaVEk/OBaSSvJN7Q2MTc1NjU0sTCxMxSSZz3QKt1oJBAemJJanZq akFqEUwfEwenVAOja+piHW6FQ+/OHHzkLPijwOYSt5Zriabg91/ME51TFqRJ7JV5uoVLXJup 1ufrcifZpnr/Z1OVJQp5t3+0mH3lR/a12nVBIou1ba0PLehaLfDOkDF5Fm9o2Obd718/22TR 5fQ303jjulqH4yrfz13v9rLslM0s81tu7PTptuONG59ZLCv2nhdUYinOSDTUYi4qTgQA7AyA SesCAAA= DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Vincent Palatin This patch adds drm_bridge driver for parade DisplayPort to LVDS bridge chip. Signed-off-by: Vincent Palatin Signed-off-by: Andrew Bresticker Signed-off-by: Sean Paul Signed-off-by: Rahul Sharma Signed-off-by: Ajay Kumar --- drivers/gpu/drm/bridge/Kconfig | 10 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/ps8622.c | 681 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 692 insertions(+) create mode 100644 drivers/gpu/drm/bridge/ps8622.c diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index d35fb68..cd6061f 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -8,6 +8,16 @@ config DRM_BRIDGE menu "bridge chips" depends on DRM_BRIDGE +config DRM_PS8622 + tristate "Parade eDP/LVDS bridge" + depends on OF + depends on I2C + select DRM_PANEL + select BACKLIGHT_LCD_SUPPORT + select BACKLIGHT_CLASS_DEVICE + help + parade eDP-LVDS bridge chip driver. + config DRM_PTN3460 tristate "PTN3460 DP/LVDS bridge" depends on OF diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index b4733e1..105da3e 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -1,3 +1,4 @@ ccflags-y := -Iinclude/drm +obj-$(CONFIG_DRM_PS8622) += ps8622.o obj-$(CONFIG_DRM_PTN3460) += ptn3460.o diff --git a/drivers/gpu/drm/bridge/ps8622.c b/drivers/gpu/drm/bridge/ps8622.c new file mode 100644 index 0000000..bea69d1 --- /dev/null +++ b/drivers/gpu/drm/bridge/ps8622.c @@ -0,0 +1,681 @@ +/* + * Parade PS8622 eDP/LVDS bridge driver + * + * Copyright (C) 2014 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "drmP.h" +#include "drm_crtc.h" +#include "drm_crtc_helper.h" + +/* Brightness scale on the Parade chip */ +#define PS8622_MAX_BRIGHTNESS 0xff + +/* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */ +#define PS8622_POWER_RISE_T1_MIN_US 10 +#define PS8622_POWER_RISE_T1_MAX_US 10000 +#define PS8622_RST_HIGH_T2_MIN_US 3000 +#define PS8622_RST_HIGH_T2_MAX_US 30000 +#define PS8622_PWMO_END_T12_MS 200 +#define PS8622_POWER_FALL_T16_MAX_US 10000 +#define PS8622_POWER_OFF_T17_MS 500 + +#if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \ + (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US)) +#error "T2.min + T1.max must be less than T2.max + T1.min" +#endif + +struct ps8622_bridge { + struct drm_connector connector; + struct i2c_client *client; + struct drm_bridge bridge; + struct drm_panel *panel; + struct regulator *v12; + struct backlight_device *bl; + + struct gpio_desc *gpio_slp; + struct gpio_desc *gpio_rst; + + u32 max_lane_count; + u32 lane_count; + + bool enabled; +}; + +static inline struct ps8622_bridge * + bridge_to_ps8622(struct drm_bridge *bridge) +{ + return container_of(bridge, struct ps8622_bridge, bridge); +} + +static inline struct ps8622_bridge * + connector_to_ps8622(struct drm_connector *connector) +{ + return container_of(connector, struct ps8622_bridge, connector); +} + +static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val) +{ + int ret; + struct i2c_adapter *adap = client->adapter; + struct i2c_msg msg; + u8 data[] = {reg, val}; + + msg.addr = client->addr + page; + msg.flags = 0; + msg.len = sizeof(data); + msg.buf = data; + + ret = i2c_transfer(adap, &msg, 1); + if (ret != 1) + pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n", + client->addr + page, reg, val, ret); + return !(ret == 1); +} + +static int ps8622_send_config(struct ps8622_bridge *ps8622) +{ + struct i2c_client *cl = ps8622->client; + int err = 0; + + /* HPD low */ + err = ps8622_set(cl, 0x02, 0xa1, 0x01); + if (err) + goto error; + + /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */ + err = ps8622_set(cl, 0x04, 0x14, 0x01); + if (err) + goto error; + + /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */ + err = ps8622_set(cl, 0x04, 0xe3, 0x20); + if (err) + goto error; + + /* [7] RCO SS enable */ + err = ps8622_set(cl, 0x04, 0xe2, 0x80); + if (err) + goto error; + + /* RPHY Setting + * [3:2] CDR tune wait cycle before measure for fine tune + * b00: 1us b01: 0.5us b10:2us, b11: 4us + */ + err = ps8622_set(cl, 0x04, 0x8a, 0x0c); + if (err) + goto error; + + /* [3] RFD always on */ + err = ps8622_set(cl, 0x04, 0x89, 0x08); + if (err) + goto error; + + /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */ + err = ps8622_set(cl, 0x04, 0x71, 0x2d); + if (err) + goto error; + + /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */ + err = ps8622_set(cl, 0x04, 0x7d, 0x07); + if (err) + goto error; + + /* [1:0] Fmin=+4bands */ + err = ps8622_set(cl, 0x04, 0x7b, 0x00); + if (err) + goto error; + + /* [7:5] DCO_FTRNG=+-40% */ + err = ps8622_set(cl, 0x04, 0x7a, 0xfd); + if (err) + goto error; + + /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */ + err = ps8622_set(cl, 0x04, 0xc0, 0x12); + if (err) + goto error; + + /* Gitune=-37% */ + err = ps8622_set(cl, 0x04, 0xc1, 0x92); + if (err) + goto error; + + /* Fbstep=100% */ + err = ps8622_set(cl, 0x04, 0xc2, 0x1c); + if (err) + goto error; + + /* [7] LOS signal disable */ + err = ps8622_set(cl, 0x04, 0x32, 0x80); + if (err) + goto error; + + /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */ + err = ps8622_set(cl, 0x04, 0x00, 0xb0); + if (err) + goto error; + + /* [7:6] Right-bar GPIO output strength is 8mA */ + err = ps8622_set(cl, 0x04, 0x15, 0x40); + if (err) + goto error; + + /* EQ Training State Machine Setting, RCO calibration start */ + err = ps8622_set(cl, 0x04, 0x54, 0x10); + if (err) + goto error; + + /* Logic, needs more than 10 I2C command */ + /* [4:0] MAX_LANE_COUNT set to max supported lanes */ + err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count); + if (err) + goto error; + + /* [4:0] LANE_COUNT_SET set to chosen lane count */ + err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count); + if (err) + goto error; + + err = ps8622_set(cl, 0x00, 0x52, 0x20); + if (err) + goto error; + + /* HPD CP toggle enable */ + err = ps8622_set(cl, 0x00, 0xf1, 0x03); + if (err) + goto error; + + err = ps8622_set(cl, 0x00, 0x62, 0x41); + if (err) + goto error; + + /* Counter number, add 1ms counter delay */ + err = ps8622_set(cl, 0x00, 0xf6, 0x01); + if (err) + goto error; + + /* [6]PWM function control by DPCD0040f[7], default is PWM block */ + err = ps8622_set(cl, 0x00, 0x77, 0x06); + if (err) + goto error; + + /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */ + err = ps8622_set(cl, 0x00, 0x4c, 0x04); + if (err) + goto error; + + /* DPCD00400='h00, Parade OUI ='h001cf8 */ + err = ps8622_set(cl, 0x01, 0xc0, 0x00); + if (err) + goto error; + + /* DPCD00401='h1c */ + err = ps8622_set(cl, 0x01, 0xc1, 0x1c); + if (err) + goto error; + + /* DPCD00402='hf8 */ + err = ps8622_set(cl, 0x01, 0xc2, 0xf8); + if (err) + goto error; + + /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */ + err = ps8622_set(cl, 0x01, 0xc3, 0x44); + if (err) + goto error; + + /* DPCD404 */ + err = ps8622_set(cl, 0x01, 0xc4, 0x32); + if (err) + goto error; + + /* DPCD405 */ + err = ps8622_set(cl, 0x01, 0xc5, 0x53); + if (err) + goto error; + + /* DPCD406 */ + err = ps8622_set(cl, 0x01, 0xc6, 0x4c); + if (err) + goto error; + + /* DPCD407 */ + err = ps8622_set(cl, 0x01, 0xc7, 0x56); + if (err) + goto error; + + /* DPCD408 */ + err = ps8622_set(cl, 0x01, 0xc8, 0x35); + if (err) + goto error; + + /* DPCD40A, Initial Code major revision '01' */ + err = ps8622_set(cl, 0x01, 0xca, 0x01); + if (err) + goto error; + + /* DPCD40B, Initial Code minor revision '05' */ + err = ps8622_set(cl, 0x01, 0xcb, 0x05); + if (err) + goto error; + + + if (ps8622->bl) { + /* DPCD720, internal PWM */ + err = ps8622_set(cl, 0x01, 0xa5, 0xa0); + if (err) + goto error; + + /* FFh for 100% brightness, 0h for 0% brightness */ + err = ps8622_set(cl, 0x01, 0xa7, + ps8622->bl->props.brightness); + if (err) + goto error; + } else { + /* DPCD720, external PWM */ + err = ps8622_set(cl, 0x01, 0xa5, 0x80); + if (err) + goto error; + } + + /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */ + err = ps8622_set(cl, 0x01, 0xcc, 0x13); + if (err) + goto error; + + /* Enable SSC set by register */ + err = ps8622_set(cl, 0x02, 0xb1, 0x20); + if (err) + goto error; + + /* Set SSC enabled and +/-1% central spreading */ + err = ps8622_set(cl, 0x04, 0x10, 0x16); + if (err) + goto error; + + /* Logic end */ + /* MPU Clock source: LC => RCO */ + err = ps8622_set(cl, 0x04, 0x59, 0x60); + if (err) + goto error; + + /* LC -> RCO */ + err = ps8622_set(cl, 0x04, 0x54, 0x14); + if (err) + goto error; + + /* HPD high */ + err = ps8622_set(cl, 0x02, 0xa1, 0x91); + +error: + return err ? -EIO : 0; +} + +static int ps8622_backlight_update(struct backlight_device *bl) +{ + struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev); + int ret, brightness = bl->props.brightness; + + if (bl->props.power != FB_BLANK_UNBLANK || + bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) + brightness = 0; + + if (!ps8622->enabled) + return -EINVAL; + + ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness); + + return ret; +} + +static const struct backlight_ops ps8622_backlight_ops = { + .update_status = ps8622_backlight_update, +}; + +static void ps8622_pre_enable(struct drm_bridge *bridge) +{ + struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); + int ret; + + if (ps8622->enabled) + return; + + gpiod_set_value(ps8622->gpio_rst, 0); + + if (ps8622->v12) { + ret = regulator_enable(ps8622->v12); + if (ret) + DRM_ERROR("fails to enable ps8622->v12"); + } + + if (drm_panel_prepare(ps8622->panel)) { + DRM_ERROR("failed to prepare panel\n"); + return; + } + + gpiod_set_value(ps8622->gpio_slp, 1); + + /* + * T1 is the range of time that it takes for the power to rise after we + * enable the lcd/ps8622 fet. T2 is the range of time in which the + * data sheet specifies we should deassert the reset pin. + * + * If it takes T1.max for the power to rise, we need to wait atleast + * T2.min before deasserting the reset pin. If it takes T1.min for the + * power to rise, we need to wait at most T2.max before deasserting the + * reset pin. + */ + usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US, + PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US); + + gpiod_set_value(ps8622->gpio_rst, 1); + + /* wait 20ms after RST high */ + usleep_range(20000, 30000); + + ret = ps8622_send_config(ps8622); + if (ret) { + DRM_ERROR("Failed to send config to bridge (%d)\n", ret); + return; + } + + ps8622->enabled = true; +} + +static void ps8622_enable(struct drm_bridge *bridge) +{ + struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); + + if (drm_panel_enable(ps8622->panel)) { + DRM_ERROR("failed to enable panel\n"); + return; + } +} + +static void ps8622_disable(struct drm_bridge *bridge) +{ + struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); + + if (drm_panel_disable(ps8622->panel)) { + DRM_ERROR("failed to disable panel\n"); + return; + } + msleep(PS8622_PWMO_END_T12_MS); +} + +static void ps8622_post_disable(struct drm_bridge *bridge) +{ + struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); + + if (!ps8622->enabled) + return; + + ps8622->enabled = false; + + /* + * This doesn't matter if the regulators are turned off, but something + * else might keep them on. In that case, we want to assert the slp gpio + * to lower power. + */ + gpiod_set_value(ps8622->gpio_slp, 0); + + if (drm_panel_unprepare(ps8622->panel)) { + DRM_ERROR("failed to unprepare panel\n"); + return; + } + + if (ps8622->v12) + regulator_disable(ps8622->v12); + + /* + * Sleep for at least the amount of time that it takes the power rail to + * fall to prevent asserting the rst gpio from doing anything. + */ + usleep_range(PS8622_POWER_FALL_T16_MAX_US, + 2 * PS8622_POWER_FALL_T16_MAX_US); + gpiod_set_value(ps8622->gpio_rst, 0); + + msleep(PS8622_POWER_OFF_T17_MS); +} + +static void ps8622_destroy(struct drm_bridge *bridge) +{ + drm_bridge_cleanup(bridge); +} + +static int ps8622_get_modes(struct drm_connector *connector) +{ + struct ps8622_bridge *ps8622; + + ps8622 = connector_to_ps8622(connector); + + return drm_panel_get_modes(ps8622->panel); +} + +static struct drm_encoder *ps8622_best_encoder(struct drm_connector *connector) +{ + struct ps8622_bridge *ps8622; + + ps8622 = connector_to_ps8622(connector); + + return ps8622->bridge.encoder; +} + +static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = { + .get_modes = ps8622_get_modes, + .best_encoder = ps8622_best_encoder, +}; + +static enum drm_connector_status ps8622_detect(struct drm_connector *connector, + bool force) +{ + return connector_status_connected; +} + +static void ps8622_connector_destroy(struct drm_connector *connector) +{ + drm_connector_cleanup(connector); +} + +static const struct drm_connector_funcs ps8622_connector_funcs = { + .dpms = drm_helper_connector_dpms, + .fill_modes = drm_helper_probe_single_connector_modes, + .detect = ps8622_detect, + .destroy = ps8622_connector_destroy, +}; + +int ps8622_attach(struct drm_bridge *bridge) +{ + struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); + int ret; + + ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD; + ret = drm_connector_init(bridge->drm, &ps8622->connector, + &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS); + if (ret) { + DRM_ERROR("Failed to initialize connector with drm\n"); + return ret; + } + drm_connector_helper_add(&ps8622->connector, + &ps8622_connector_helper_funcs); + drm_connector_register(&ps8622->connector); + drm_mode_connector_attach_encoder(&ps8622->connector, + bridge->encoder); + + if (ps8622->panel) + drm_panel_attach(ps8622->panel, &ps8622->connector); + + drm_helper_hpd_irq_event(ps8622->connector.dev); + + return ret; +} + +static const struct drm_bridge_funcs ps8622_bridge_funcs = { + .pre_enable = ps8622_pre_enable, + .enable = ps8622_enable, + .disable = ps8622_disable, + .post_disable = ps8622_post_disable, + .destroy = ps8622_destroy, + .attach = ps8622_attach, +}; + +static const struct of_device_id ps8622_devices[] = { + {.compatible = "parade,ps8622",}, + {.compatible = "parade,ps8625",}, + {} +}; +MODULE_DEVICE_TABLE(of, ps8622_devices); + +static int ps8622_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct device_node *panel_node; + struct ps8622_bridge *ps8622; + int ret; + + ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); + if (!ps8622) + return -ENOMEM; + + panel_node = of_parse_phandle(dev->of_node, "panel", 0); + if (panel_node) { + ps8622->panel = of_drm_find_panel(panel_node); + of_node_put(panel_node); + if (!ps8622->panel) + return -EPROBE_DEFER; + } + + ps8622->client = client; + + ps8622->v12 = devm_regulator_get(dev, "vdd12"); + if (IS_ERR(ps8622->v12)) { + dev_info(dev, "no 1.2v regulator found for PS8622\n"); + ps8622->v12 = NULL; + } + + ps8622->gpio_slp = devm_gpiod_get(dev, "sleep"); + if (IS_ERR(ps8622->gpio_slp)) { + ret = PTR_ERR(ps8622->gpio_slp); + dev_err(dev, "cannot get gpio_slp %d\n", ret); + return ret; + } + ret = gpiod_direction_output(ps8622->gpio_slp, 1); + if (ret) { + dev_err(dev, "cannot configure gpio_slp\n"); + return ret; + } + + ps8622->gpio_rst = devm_gpiod_get(dev, "reset"); + if (IS_ERR(ps8622->gpio_rst)) { + ret = PTR_ERR(ps8622->gpio_rst); + dev_err(dev, "cannot get gpio_rst %d\n", ret); + return ret; + } + /* + * Assert the reset pin high to avoid the bridge being + * initialized prematurely + */ + ret = gpiod_direction_output(ps8622->gpio_rst, 1); + if (ret) { + dev_err(dev, "cannot configure gpio_rst\n"); + return ret; + } + + ps8622->max_lane_count = id->driver_data; + + if (of_property_read_u32(dev->of_node, "lane-count", + &ps8622->lane_count)) { + ps8622->lane_count = ps8622->max_lane_count; + } else if (ps8622->lane_count > ps8622->max_lane_count) { + dev_info(dev, "lane-count property is too high," + "using max_lane_count\n"); + ps8622->lane_count = ps8622->max_lane_count; + } + + if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) { + ps8622->bl = backlight_device_register("ps8622-backlight", + dev, ps8622, &ps8622_backlight_ops, + NULL); + if (IS_ERR(ps8622->bl)) { + DRM_ERROR("failed to register backlight\n"); + ret = PTR_ERR(ps8622->bl); + ps8622->bl = NULL; + return ret; + } + ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS; + ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS; + } + + ps8622->bridge.dev = dev; + ps8622->bridge.funcs = &ps8622_bridge_funcs; + ret = drm_bridge_add(&ps8622->bridge); + if (ret) { + DRM_ERROR("Failed to add bridge\n"); + return ret; + } + + i2c_set_clientdata(client, ps8622); + + return 0; +} + +static int ps8622_remove(struct i2c_client *client) +{ + struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); + + if (ps8622->bl) + backlight_device_unregister(ps8622->bl); + + drm_bridge_remove(&ps8622->bridge); + + return 0; +} + +static const struct i2c_device_id ps8622_i2c_table[] = { + /* Device type, max_lane_count */ + {"ps8622", 1}, + {"ps8625", 2}, + {}, +}; +MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table); + +struct i2c_driver ps8622_driver = { + .id_table = ps8622_i2c_table, + .probe = ps8622_probe, + .remove = ps8622_remove, + .driver = { + .name = "ps8622", + .owner = THIS_MODULE, + .of_match_table = ps8622_devices, + }, +}; +module_i2c_driver(ps8622_driver); + +MODULE_AUTHOR("Vincent Palatin "); +MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver"); +MODULE_LICENSE("GPL v2");