From nobody Sat Nov 23 17:58:31 2024 Received: from szxga06-in.huawei.com (szxga06-in.huawei.com [45.249.212.32]) (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 EDF3214A0AA for ; Tue, 12 Nov 2024 13:29:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.32 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731418168; cv=none; b=INTalXUu+3VwxNizVGbjtyuWmwdnef7YnSU9Efc2qaXzMlZd5ugWFbR18yar4seOyfMyLp1MCQHn8d1DBijUVrM4xb4BZGuzmeUAnE5+yRqYl0FOOLFfxHvcoC37ddV4IkWEZWZ9AMIXqbvpMBNdrK8LyCYoohx/+t5WknxJB6M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731418168; c=relaxed/simple; bh=zy2p2xOJEBiWV8WLDdq3PmOk14afMKy1yudfTZUn+x8=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=iCockKjQh714Tql6xwVfOGEnNVemBJNtg/6s7bPEH6uU1BR4H0YIolLganmQ0UFrYD7RNYn9XqpwMl99bKL8m02AGta6XjeSVf+xI/CQ2BjbokmjNOizjvE+J2kDhXAMCgHtyDklQomZ5BLmB8ghbJ+8MYK8ZPEf82v9p4ERWQk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.163.44]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4XnnMJ5clwz1ypZK; Tue, 12 Nov 2024 21:29:32 +0800 (CST) Received: from kwepemd500013.china.huawei.com (unknown [7.221.188.12]) by mail.maildlp.com (Postfix) with ESMTPS id 6A99E14011D; Tue, 12 Nov 2024 21:29:21 +0800 (CST) Received: from localhost.huawei.com (10.169.71.169) by kwepemd500013.china.huawei.com (7.221.188.12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.34; Tue, 12 Nov 2024 21:29:19 +0800 From: Yongbang Shi To: , , , , , , , CC: , , , , , , , , Subject: [PATCH v4 drm-dp 1/5] drm/hisilicon/hibmc: add dp aux in hibmc Date: Tue, 12 Nov 2024 21:23:44 +0800 Message-ID: <20241112132348.2631150-2-shiyongbang@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20241112132348.2631150-1-shiyongbang@huawei.com> References: <20241112132348.2631150-1-shiyongbang@huawei.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 X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemd500013.china.huawei.com (7.221.188.12) Content-Type: text/plain; charset="utf-8" From: baihan li Add dp aux read/write functions. They are basic functions and will be used later. Signed-off-by: Baihan Li Signed-off-by: Yongbang Shi --- ChangeLog: v3 -> v4: - retun error codes in result incorrect branch, suggested by Dmitry Bary= shkov. - replacing all ret=3D with returns, suggested by Dmitry Baryshkov. - moving the comment below the judgment statement, suggested by Dmitry Ba= ryshkov. - moving definations to the source file and clearing headers, suggested b= y Dmitry Baryshkov. - reanaming dp_prefix to hibmc_dp_prefix, suggested by Dmitry Baryshkov. - changing hibmc_dp_reg_write_field to static inline and lock, suggested = by Dmitry Baryshkov. - moving some structs to later patch, suggested by Dmitry Baryshkov. v2 -> v3: - put the macro definations in latter patch where they are actually used,= suggested by Dmitry Baryshkov. - rename some macro definations to make them sensible, suggested by Dmitr= y Baryshkov. - using FIELD_PREP and FIELD_GET, suggested by Dmitry Baryshkov. - using DP_DPCD_REV_foo, suggested by Dmitry Baryshkov. - fix build errors reported by kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202410250305.UHKDhtxy-lkp= @intel.com/ v1 -> v2: - using drm_dp_aux frame implement dp aux read and write functions, sugge= sted by Jani Nikula. - using drm dp header files' dp macros instead, suggested by Andy Yan. v1:https://lore.kernel.org/all/20240930100610.782363-1-shiyongbang@huawei= .com/ --- drivers/gpu/drm/hisilicon/hibmc/Makefile | 3 +- drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c | 164 +++++++++++++++++++ drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h | 39 +++++ drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h | 27 +++ 4 files changed, 232 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c create mode 100644 drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h create mode 100644 drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h diff --git a/drivers/gpu/drm/hisilicon/hibmc/Makefile b/drivers/gpu/drm/his= ilicon/hibmc/Makefile index d25c75e60d3d..8770ec6dfffd 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/Makefile +++ b/drivers/gpu/drm/hisilicon/hibmc/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only -hibmc-drm-y :=3D hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_drm= _i2c.o +hibmc-drm-y :=3D hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_drm= _i2c.o \ + dp/dp_aux.o =20 obj-$(CONFIG_DRM_HISI_HIBMC) +=3D hibmc-drm.o diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c b/drivers/gpu/drm/= hisilicon/hibmc/dp/dp_aux.c new file mode 100644 index 000000000000..16bdfefbf255 --- /dev/null +++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c @@ -0,0 +1,164 @@ +// SPDX-License-Identifier: GPL-2.0-or-laterHIBMC_BYTES_IN_U32 +// Copyright (c) 2024 Hisilicon Limited. + +#include +#include +#include +#include +#include +#include "dp_comm.h" +#include "dp_reg.h" + +#define HIBMC_AUX_CMD_REQ_LEN GENMASK(7, 4) +#define HIBMC_AUX_CMD_ADDR GENMASK(27, 8) +#define HIBMC_AUX_CMD_I2C_ADDR_ONLY BIT(28) +#define HIBMC_BYTES_IN_U32 4 +#define HIBMC_AUX_I2C_WRITE_SUCCESS 0x1 +#define HIBMC_DP_MIN_PULSE_NUM 0x9 +#define BITS_IN_U8 8 + +static inline void hibmc_dp_aux_reset(struct hibmc_dp_dev *dp) +{ + hibmc_dp_reg_write_field(dp, HIBMC_DP_DPTX_RST_CTRL, HIBMC_DP_CFG_AUX_RST= _N, 0x0); + usleep_range(10, 15); + hibmc_dp_reg_write_field(dp, HIBMC_DP_DPTX_RST_CTRL, HIBMC_DP_CFG_AUX_RST= _N, 0x1); +} + +static void hibmc_dp_aux_read_data(struct hibmc_dp_dev *dp, u8 *buf, u8 si= ze) +{ + u32 reg_num; + u32 value; + u32 num; + u8 i, j; + + reg_num =3D DIV_ROUND_UP(size, HIBMC_BYTES_IN_U32); + for (i =3D 0; i < reg_num; i++) { + /* number of bytes read from a single register */ + num =3D min(size - i * HIBMC_BYTES_IN_U32, HIBMC_BYTES_IN_U32); + value =3D readl(dp->base + HIBMC_DP_AUX_RD_DATA0 + i * HIBMC_BYTES_IN_U3= 2); + /* convert the 32-bit value of the register to the buffer. */ + for (j =3D 0; j < num; j++) + buf[i * HIBMC_BYTES_IN_U32 + j] =3D value >> (j * BITS_IN_U8); + } +} + +static void hibmc_dp_aux_write_data(struct hibmc_dp_dev *dp, u8 *buf, u8 s= ize) +{ + u32 reg_num; + u32 value; + u32 num; + u8 i, j; + + reg_num =3D DIV_ROUND_UP(size, HIBMC_BYTES_IN_U32); + for (i =3D 0; i < reg_num; i++) { + /* number of bytes written to a single register */ + num =3D min_t(u8, size - i * HIBMC_BYTES_IN_U32, HIBMC_BYTES_IN_U32); + value =3D 0; + /* obtain the 32-bit value written to a single register. */ + for (j =3D 0; j < num; j++) + value |=3D buf[i * HIBMC_BYTES_IN_U32 + j] << (j * BITS_IN_U8); + /* writing data to a single register */ + writel(value, dp->base + HIBMC_DP_AUX_WR_DATA0 + i * HIBMC_BYTES_IN_U32); + } +} + +static u32 hibmc_dp_aux_build_cmd(const struct drm_dp_aux_msg *msg) +{ + u32 aux_cmd =3D msg->request; + + if (msg->size) + aux_cmd |=3D FIELD_PREP(HIBMC_AUX_CMD_REQ_LEN, (msg->size - 1)); + else + aux_cmd |=3D FIELD_PREP(HIBMC_AUX_CMD_I2C_ADDR_ONLY, 1); + + aux_cmd |=3D FIELD_PREP(HIBMC_AUX_CMD_ADDR, msg->address); + + return aux_cmd; +} + +/* ret >=3D 0, ret is size; ret < 0, ret is err code */ +static int hibmc_dp_aux_parse_xfer(struct hibmc_dp_dev *dp, struct drm_dp_= aux_msg *msg) +{ + u32 buf_data_cnt; + u32 aux_status; + + aux_status =3D readl(dp->base + HIBMC_DP_AUX_STATUS); + msg->reply =3D FIELD_GET(HIBMC_DP_CFG_AUX_STATUS, aux_status); + + if (aux_status & HIBMC_DP_CFG_AUX_TIMEOUT) + return -ETIMEDOUT; + + /* only address */ + if (!msg->size) + return 0; + + if (msg->reply !=3D DP_AUX_NATIVE_REPLY_ACK) + return -EIO; + + buf_data_cnt =3D FIELD_GET(HIBMC_DP_CFG_AUX_READY_DATA_BYTE, aux_status); + + switch (msg->request) { + case DP_AUX_NATIVE_WRITE: + return msg->size; + case DP_AUX_I2C_WRITE | DP_AUX_I2C_MOT: + if (buf_data_cnt =3D=3D HIBMC_AUX_I2C_WRITE_SUCCESS) + return msg->size; + else + return FIELD_GET(HIBMC_DP_CFG_AUX, aux_status); + case DP_AUX_NATIVE_READ: + case DP_AUX_I2C_READ | DP_AUX_I2C_MOT: + buf_data_cnt--; + if (buf_data_cnt !=3D msg->size) { + /* only the successful part of data is read */ + return -EBUSY; + } + + /* all data is successfully read */ + hibmc_dp_aux_read_data(dp, msg->buffer, msg->size); + return msg->size; + default: + return -EINVAL; + } +} + +/* ret >=3D 0 ,ret is size; ret < 0, ret is err code */ +static ssize_t hibmc_dp_aux_xfer(struct drm_dp_aux *aux, struct drm_dp_aux= _msg *msg) +{ + struct hibmc_dp_dev *dp =3D container_of(aux, struct hibmc_dp_dev, aux); + u32 aux_cmd; + int ret; + u32 val; /* val will be assigned at the beginning of readl_poll_timeout f= unction */ + + writel(0, dp->base + HIBMC_DP_AUX_WR_DATA0); + writel(0, dp->base + HIBMC_DP_AUX_WR_DATA1); + writel(0, dp->base + HIBMC_DP_AUX_WR_DATA2); + writel(0, dp->base + HIBMC_DP_AUX_WR_DATA3); + + hibmc_dp_aux_write_data(dp, msg->buffer, msg->size); + + aux_cmd =3D hibmc_dp_aux_build_cmd(msg); + writel(aux_cmd, dp->base + HIBMC_DP_AUX_CMD_ADDR); + + /* enable aux transfer */ + hibmc_dp_reg_write_field(dp, HIBMC_DP_AUX_REQ, HIBMC_DP_CFG_AUX_REQ, 0x1); + ret =3D readl_poll_timeout(dp->base + HIBMC_DP_AUX_REQ, val, + !(val & HIBMC_DP_CFG_AUX_REQ), 50, 5000); + if (ret) { + hibmc_dp_aux_reset(dp); + return ret; + } + + return hibmc_dp_aux_parse_xfer(dp, msg); +} + +void hibmc_dp_aux_init(struct hibmc_dp_dev *dp) +{ + hibmc_dp_reg_write_field(dp, HIBMC_DP_AUX_REQ, HIBMC_DP_CFG_AUX_SYNC_LEN_= SEL, 0x0); + hibmc_dp_reg_write_field(dp, HIBMC_DP_AUX_REQ, HIBMC_DP_CFG_AUX_TIMER_TIM= EOUT, 0x1); + hibmc_dp_reg_write_field(dp, HIBMC_DP_AUX_REQ, HIBMC_DP_CFG_AUX_MIN_PULSE= _NUM, + HIBMC_DP_MIN_PULSE_NUM); + + dp->aux.transfer =3D hibmc_dp_aux_xfer; + dp->aux.is_remote =3D 0; + drm_dp_aux_init(&dp->aux); +} diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h b/drivers/gpu/drm= /hisilicon/hibmc/dp/dp_comm.h new file mode 100644 index 000000000000..eff4c39fa7e5 --- /dev/null +++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* Copyright (c) 2024 Hisilicon Limited. */ + +#ifndef DP_COMM_H +#define DP_COMM_H + +#include +#include +#include +#include +#include +#include +#include +#include + +struct hibmc_dp_dev { + struct drm_dp_aux aux; + struct drm_device *dev; + void __iomem *base; + struct mutex lock; /* protects concurrent RW in hibmc_dp_reg_write_field(= ) */ +}; + +static inline void hibmc_dp_reg_write_field(struct hibmc_dp_dev *dp, u32 o= ffset, u32 mask, u32 val) +{ + u32 value; + + mutex_lock(&dp->lock); + + value =3D readl(dp->base + offset); + value &=3D ~mask; + value |=3D FIELD_PREP(mask, val); + writel(value, dp->base + offset); + + mutex_unlock(&dp->lock); +} + +void hibmc_dp_aux_init(struct hibmc_dp_dev *dp); + +#endif diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h b/drivers/gpu/drm/= hisilicon/hibmc/dp/dp_reg.h new file mode 100644 index 000000000000..f3e6781e111a --- /dev/null +++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* Copyright (c) 2024 Hisilicon Limited. */ + +#ifndef DP_REG_H +#define DP_REG_H + +#define HIBMC_DP_AUX_CMD_ADDR 0x50 +#define HIBMC_DP_AUX_WR_DATA0 0x54 +#define HIBMC_DP_AUX_WR_DATA1 0x58 +#define HIBMC_DP_AUX_WR_DATA2 0x5c +#define HIBMC_DP_AUX_WR_DATA3 0x60 +#define HIBMC_DP_AUX_RD_DATA0 0x64 +#define HIBMC_DP_AUX_REQ 0x74 +#define HIBMC_DP_AUX_STATUS 0x78 +#define HIBMC_DP_DPTX_RST_CTRL 0x700 + +#define HIBMC_DP_CFG_AUX_SYNC_LEN_SEL BIT(1) +#define HIBMC_DP_CFG_AUX_TIMER_TIMEOUT BIT(2) +#define HIBMC_DP_CFG_AUX_MIN_PULSE_NUM GENMASK(13, 9) +#define HIBMC_DP_CFG_AUX_REQ BIT(0) +#define HIBMC_DP_CFG_AUX_RST_N BIT(4) +#define HIBMC_DP_CFG_AUX_TIMEOUT BIT(0) +#define HIBMC_DP_CFG_AUX_READY_DATA_BYTE GENMASK(16, 12) +#define HIBMC_DP_CFG_AUX GENMASK(24, 17) +#define HIBMC_DP_CFG_AUX_STATUS GENMASK(11, 4) + +#endif --=20 2.33.0