linux-kernel - Re: [PATCH v2 02/15] [media] mtk-mipicsi: add mediatek mipicsi driver for mt2712

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Date:   Thu, 18 Apr 2019 09:34:29 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Stu Hsieh <stu.hsieh@...iatek.com>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v2 02/15] [media] mtk-mipicsi: add mediatek mipicsi
 driver for mt2712

Hi, Stu:

On Tue, 2019-04-16 at 17:30 +0800, Stu Hsieh wrote:
> This patch add mediatek mipicsi driver for mt2712,
> including probe function to get the value from device tree,
> and register to v4l2 the host device.
> 
> Signed-off-by: Stu Hsieh <stu.hsieh@...iatek.com>
> ---
>  drivers/media/platform/mtk-mipicsi/Makefile   |   4 +
>  .../media/platform/mtk-mipicsi/mtk_mipicsi.c  | 767 ++++++++++++++++++
>  2 files changed, 771 insertions(+)
>  create mode 100644 drivers/media/platform/mtk-mipicsi/Makefile
>  create mode 100644 drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
> 
> diff --git a/drivers/media/platform/mtk-mipicsi/Makefile b/drivers/media/platform/mtk-mipicsi/Makefile
> new file mode 100644
> index 000000000000..326a5e3808fa
> --- /dev/null
> +++ b/drivers/media/platform/mtk-mipicsi/Makefile
> @@ -0,0 +1,4 @@
> +mtk-mipicsi-y += mtk_mipicsi.o
> +
> +obj-$(CONFIG_VIDEO_MEDIATEK_MIPICSI) += mtk-mipicsi.o
> +
> diff --git a/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c b/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
> new file mode 100644
> index 000000000000..e26bebe17fe5
> --- /dev/null
> +++ b/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
> @@ -0,0 +1,767 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2017 MediaTek Inc.
> + * Author: Ricky Zhang <ricky.zhang@...iatek.com>
> + *         Baoyin Zhang <baoyin.zhang@...iatek.com>
> + *         Alan Yue <alan.yue@...iatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * 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
> + * http://www.gnu.org/licenses/gpl-2.0.html for more details.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/io.h>
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/err.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/mm.h>
> +#include <linux/moduleparam.h>
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/iommu.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-dev.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <media/soc_camera.h>
> +#include <media/drv-intf/soc_mediabus.h>
> +#include <media/videobuf2-core.h>
> +#include <linux/videodev2.h>
> +#include <soc/mediatek/smi.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +
> +#ifdef CONFIG_VB2_MEDIATEK_DMA_SG
> +#include "mtkbuf-dma-cache-sg.h"
> +#endif
> +
> +#define MTK_MIPICSI_DRV_NAME "mtk-mipicsi"
> +#define MTK_PLATFORM_STR "platform:mt2712"
> +#define MIPICSI_COMMON_CLK 2
> +#define MTK_CAMDMA_MAX_NUM 4U
> +#define MIPICSI_CLK (MIPICSI_COMMON_CLK + MTK_CAMDMA_MAX_NUM)
> +#define MTK_DATAWIDTH_8					(0x01U << 7U)
> +#define MAX_SUPPORT_WIDTH             4096U
> +#define MAX_SUPPORT_HEIGHT            4096U
> +#define MAX_BUFFER_NUM			32U
> +#define VID_LIMIT_BYTES			(100U * 1024U * 1024U)
> +
> +/* buffer for one video frame */
> +struct mtk_mipicsi_buf {
> +	struct list_head queue;
> +	struct vb2_buffer *vb;
> +	dma_addr_t vb_dma_addr_phy;
> +	int prepare_flag;
> +};
> +
> +struct mtk_mipicsi_dev {
> +	struct soc_camera_host	soc_host;
> +	struct platform_device *pdev;
> +	unsigned int camsv_num;
> +	struct v4l2_device	v4l2_dev;
> +	struct device *larb_pdev;
> +	void __iomem		*ana;
> +	void __iomem		*seninf_ctrl;

Separating register control to another patch looks strange to me.
Register control is the bottom part and this patch is the top part. You
send a top part first then the bottom part. 'seninf_ctrl' is useless in
this patch, you may move this to the patch that use this variable or
merge that patch into this patch.

Regards,
CK

> +	void __iomem		*seninf;
> +	struct regmap		*seninf_top;
> +	void __iomem		*seninf_mux[MTK_CAMDMA_MAX_NUM];
> +	void __iomem		*camsv[MTK_CAMDMA_MAX_NUM];
> +	const struct soc_camera_format_xlate *current_fmt;
> +	u16				width_flags;	/* max 12 bits */
> +	struct list_head	capture_list[MTK_CAMDMA_MAX_NUM];
> +	struct list_head	fb_list;
> +	spinlock_t		lock;
> +	spinlock_t		queue_lock;
> +	struct mtk_mipicsi_buf	cam_buf[MAX_BUFFER_NUM];
> +	bool streamon;
> +	unsigned long frame_cnt[MTK_CAMDMA_MAX_NUM];
> +	unsigned int link;
> +	unsigned long enqueue_cnt;
> +	unsigned long dequeue_cnt;
> +	struct v4l2_ctrl_handler ctrl_hdl;
> +	char drv_name[16];
> +	u32 id;
> +	int clk_num;
> +	struct clk		*clk[MIPICSI_CLK];
> +};
> +