Message-ID: <93a98b65-ada9-437c-6916-27fe1214cdaf@somainline.org>
Date:   Thu, 14 Oct 2021 11:20:17 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
To:     Yunfei Dong <yunfei.dong@...iatek.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tomasz Figa <tfiga@...gle.com>
Cc:     Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Irui Wang <irui.wang@...iatek.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        srv_heupstream@...iatek.com, linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v7, 04/15] media: mtk-vcodec: Manage multi hardware
 information

> Manage each hardware information which includes irq/power/clk.
> The hardware includes LAT0, LAT1 and CORE.
> 
> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> ---
> v7: Using of_platform_populate not component framework to manage multi hardware.
> ---
>   drivers/media/platform/mtk-vcodec/Makefile    |   1 +
>   .../platform/mtk-vcodec/mtk_vcodec_dec.h      |   1 +
>   .../platform/mtk-vcodec/mtk_vcodec_dec_drv.c  | 151 ++++++++++++----
>   .../platform/mtk-vcodec/mtk_vcodec_dec_hw.c   | 165 ++++++++++++++++++
>   .../platform/mtk-vcodec/mtk_vcodec_dec_hw.h   |  49 ++++++
>   .../mtk-vcodec/mtk_vcodec_dec_stateful.c      |   1 +
>   .../mtk-vcodec/mtk_vcodec_dec_stateless.c     |   1 +
>   .../platform/mtk-vcodec/mtk_vcodec_drv.h      |  23 +++
>   8 files changed, 359 insertions(+), 33 deletions(-)
>   create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_hw.c
>   create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_hw.h
> 



Hello Yunfei,

thanks for this great series! However, there are a few things to improve...

> diff --git a/drivers/media/platform/mtk-vcodec/Makefile b/drivers/media/platform/mtk-vcodec/Makefile
> index ca8e9e7a9c4e..edeb3b66e9e9 100644
> --- a/drivers/media/platform/mtk-vcodec/Makefile
> +++ b/drivers/media/platform/mtk-vcodec/Makefile
> @@ -15,6 +15,7 @@ mtk-vcodec-dec-y := vdec/vdec_h264_if.o \
>   		mtk_vcodec_dec_stateful.o \
>   		mtk_vcodec_dec_stateless.o \
>   		mtk_vcodec_dec_pm.o \
> +		mtk_vcodec_dec_hw.o \
>   
>   mtk-vcodec-enc-y := venc/venc_vp8_if.o \
>   		venc/venc_h264_if.o \
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> index 9fbd24186c1a..c509224cbff4 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> @@ -66,6 +66,7 @@ extern const struct v4l2_ioctl_ops mtk_vdec_ioctl_ops;
>   extern const struct v4l2_m2m_ops mtk_vdec_m2m_ops;
>   extern const struct media_device_ops mtk_vcodec_media_ops;
>   
> +extern struct platform_driver mtk_vdec_comp_driver;

This may be useless... more on that later in this review.

>   
>   /*
>    * mtk_vdec_lock/mtk_vdec_unlock are for ctx instance to
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> index dd749d41c75a..17cb3e3519eb 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> @@ -18,19 +18,61 @@
>   
>   #include "mtk_vcodec_drv.h"
>   #include "mtk_vcodec_dec.h"
> +#include "mtk_vcodec_dec_hw.h"
>   #include "mtk_vcodec_dec_pm.h"
>   #include "mtk_vcodec_intr.h"
> -#include "mtk_vcodec_util.h"
>   #include "mtk_vcodec_fw.h"
>   
> -#define VDEC_HW_ACTIVE	0x10
> -#define VDEC_IRQ_CFG	0x11
> -#define VDEC_IRQ_CLR	0x10
> -#define VDEC_IRQ_CFG_REG	0xa4
> -
>   module_param(mtk_v4l2_dbg_level, int, 0644);
>   module_param(mtk_vcodec_dbg, bool, 0644);
>   
> +static struct of_device_id mtk_vdec_drv_ids[] = {
> +	{
> +		.compatible = "mediatek,mtk-vcodec-lat",
> +		.data = (void *)MTK_VDEC_LAT0,
> +	},
> +	{
> +		.compatible = "mediatek,mtk-vcodec-core",
> +		.data = (void *)MTK_VDEC_CORE,
> +	},
> +	{},
> +};

Is this a duplicate of "mtk_vdec_comp_ids", found in mtk_vcodec_dec_hw.c?!

> +
> +static int mtk_vcodec_comp_device_check(struct mtk_vcodec_ctx *ctx)
> + {
> +	struct mtk_vcodec_dev *vdec_dev = ctx->dev;
> +	struct platform_device *pdev = vdec_dev->plat_dev;
> +	struct device_node *comp_node;
> +	enum mtk_vdec_hw_id comp_idx;
> +	const struct of_device_id *of_id;
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(mtk_vdec_drv_ids); i++) {
> +		of_id = &mtk_vdec_drv_ids[i];
> +		comp_node = of_find_compatible_node(NULL, NULL,
> +			of_id->compatible);
> +		if (!comp_node)
> +			continue;
> +
> +		if (!of_device_is_available(comp_node)) {
> +			of_node_put(comp_node);
> +			dev_err(&pdev->dev, "Fail to get MMSYS node\n");
> +			continue;
> +		}
> +
> +		comp_idx = (enum mtk_vdec_hw_id)of_id->data;
> +		vdec_dev->component_node[comp_idx] = comp_node;
> +
> +		if (!test_bit(comp_idx, vdec_dev->hardware_bitmap)) {
> +			dev_err(&pdev->dev, "Vdec comp_idx is not ready %d.",
> +				comp_idx);
> +			return -EINVAL;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>   static irqreturn_t mtk_vcodec_dec_irq_handler(int irq, void *priv)
>   {
>   	struct mtk_vcodec_dev *dev = priv;
> @@ -95,6 +137,41 @@ static int mtk_vcodec_get_reg_bases(struct mtk_vcodec_dev *dev)
>   	return 0;
>   }
>   
> +static int mtk_vcodec_init_dec_params(struct mtk_vcodec_dev *dev)
> +{
> +	struct platform_device *pdev = dev->plat_dev;
> +	int ret;
> +
> +	ret = mtk_vcodec_get_reg_bases(dev);
> +	if (ret)
> +		return ret;
> +
> +	if (!dev->vdec_pdata->is_comp_supported) {

component is never supported (is_comp_supported is always false), so this check
is useless.

> +		dev->dec_irq = platform_get_irq(pdev, 0);
> +		if (dev->dec_irq < 0) {
> +			dev_err(&pdev->dev, "failed to get irq number");
> +			return dev->dec_irq;
> +		}
> +
> +		irq_set_status_flags(dev->dec_irq, IRQ_NOAUTOEN);
> +		ret = devm_request_irq(&pdev->dev, dev->dec_irq,
> +			mtk_vcodec_dec_irq_handler, 0, pdev->name, dev);
> +		if (ret) {
> +			dev_err(&pdev->dev, "failed to install dev->dec_irq %d (%d)",
> +				dev->dec_irq, ret);
> +			return ret;
> +		}
> +
> +		ret = mtk_vcodec_init_dec_pm(pdev, &dev->pm);
> +		if (ret < 0) {
> +			dev_err(&pdev->dev, "failed to get mt vcodec clock source");
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>   static int fops_vcodec_open(struct file *file)
>   {
>   	struct mtk_vcodec_dev *dev = video_drvdata(file);
> @@ -116,6 +193,12 @@ static int fops_vcodec_open(struct file *file)
>   	init_waitqueue_head(&ctx->queue);
>   	mutex_init(&ctx->lock);
>   
> +	ret = mtk_vcodec_comp_device_check(ctx);

Are you checking available devices outside of a probe function?
 From what I can see, you require that the MMSYS device is available at this
time, but that's something that should be granted if we reach this point.

I would say that this driver probe should be deferred until the MMSYS device
becomes available, since it's required for this to work and since, once that
device gets registered and probed successfully, it'll never go away (unless
module unloaded, but you can't unload module A if module B is using it, or
depends on it, unless you also unload module B): like this, you will avoid
performing N useless checks, everytime the userspace opens the vdec device.

> +	if (ret) {
> +		mtk_v4l2_err("Failed to check vdec comp device.");
> +		goto err_ctrls_setup;
> +	}
> +
>   	ctx->type = MTK_INST_DECODER;
>   	ret = dev->vdec_pdata->ctrls_setup(ctx);
>   	if (ret) {
> @@ -220,7 +303,6 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>   {
>   	struct mtk_vcodec_dev *dev;
>   	struct video_device *vfd_dec;
> -	struct resource *res;
>   	phandle rproc_phandle;
>   	enum mtk_vcodec_fw_type fw_type;
>   	int ret;
> @@ -249,32 +331,10 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>   	if (IS_ERR(dev->fw_handler))
>   		return PTR_ERR(dev->fw_handler);
>   
> -	ret = mtk_vcodec_init_dec_pm(dev->plat_dev, &dev->pm);
> -	if (ret < 0) {
> -		dev_err(&pdev->dev, "Failed to get mt vcodec clock source");
> -		goto err_dec_pm;
> -	}
> -
> -	ret = mtk_vcodec_get_reg_bases(dev);
> -	if (ret)
> -		goto err_res;
> -
> -	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> -	if (res == NULL) {
> -		dev_err(&pdev->dev, "failed to get irq resource");
> -		ret = -ENOENT;
> -		goto err_res;
> -	}
> -
> -	dev->dec_irq = platform_get_irq(pdev, 0);
> -	irq_set_status_flags(dev->dec_irq, IRQ_NOAUTOEN);
> -	ret = devm_request_irq(&pdev->dev, dev->dec_irq,
> -			mtk_vcodec_dec_irq_handler, 0, pdev->name, dev);
> +	ret = mtk_vcodec_init_dec_params(dev);
>   	if (ret) {
> -		dev_err(&pdev->dev, "Failed to install dev->dec_irq %d (%d)",
> -			dev->dec_irq,
> -			ret);
> -		goto err_res;
> +		dev_err(&pdev->dev, "Failed to init pm and registers");
> +		goto err_dec_pm;
>   	}
>   
>   	mutex_init(&dev->dec_mutex);
> @@ -329,6 +389,13 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>   		goto err_event_workq;
>   	}
>   
> +	ret = of_platform_populate(pdev->dev.of_node, NULL, NULL,
> +		&pdev->dev);
> +	if (ret) {
> +		mtk_v4l2_err("Master device of_platform_populate failed.");
> +		goto err_event_workq;
> +	}
> +
>   	if (dev->vdec_pdata->uses_stateless_api) {
>   		dev->mdev_dec.dev = &pdev->dev;
>   		strscpy(dev->mdev_dec.model, MTK_VCODEC_DEC_NAME,
> @@ -436,7 +503,25 @@ static struct platform_driver mtk_vcodec_dec_driver = {
>   	},
>   };
>   
> -module_platform_driver(mtk_vcodec_dec_driver);
> +static struct platform_driver * const mtk_vdec_drivers[] = {
> +	&mtk_vdec_comp_driver,
> +	&mtk_vcodec_dec_driver,
> +};

I would say that this is not a good idea, since you can simply register
your mtk_vdec_comp_driver in mtk_vcodec_dec_hw.c.

> +
> +static int __init mtk_vdec_init(void)
> +{
> +	return platform_register_drivers(mtk_vdec_drivers,
> +					 ARRAY_SIZE(mtk_vdec_drivers));
> +}
> +
> +static void __exit mtk_vdec_exit(void)
> +{
> +	platform_unregister_drivers(mtk_vdec_drivers,
> +				    ARRAY_SIZE(mtk_vdec_drivers));
> +}
> +
> +module_init(mtk_vdec_init);
> +module_exit(mtk_vdec_exit);
>   
>   MODULE_LICENSE("GPL v2");
>   MODULE_DESCRIPTION("Mediatek video codec V4L2 decoder driver");
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_hw.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_hw.c
> new file mode 100644
> index 000000000000..3752ccaea284
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_hw.c
> @@ -0,0 +1,165 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2021 MediaTek Inc.
> + * Author: Yunfei Dong <yunfei.dong@...iatek.com>
> + */
> +
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/slab.h>
> +
> +#include "mtk_vcodec_drv.h"
> +#include "mtk_vcodec_dec.h"
> +#include "mtk_vcodec_dec_hw.h"
> +#include "mtk_vcodec_dec_pm.h"
> +#include "mtk_vcodec_intr.h"
> +#include "mtk_vcodec_util.h"
> +
> +static const struct of_device_id mtk_vdec_comp_ids[] = {
> +	{
> +		.compatible = "mediatek,mtk-vcodec-lat",
> +	},
> +	{
> +		.compatible = "mediatek,mtk-vcodec-core",
> +	},
> +	{},
> +};

I think that you forgot some ".data = " here...

> +
> +static irqreturn_t mtk_vdec_comp_irq_handler(int irq, void *priv)
> +{
> +	struct mtk_vdec_comp_dev *dev = priv;
> +	struct mtk_vcodec_ctx *ctx;
> +	u32 cg_status;
> +	unsigned int dec_done_status;
> +	void __iomem *vdec_misc_addr = dev->reg_base[VDEC_COMP_MISC] +
> +					VDEC_IRQ_CFG_REG;
> +
> +	ctx = mtk_vcodec_get_curr_ctx(dev->master_dev);
> +
> +	/* check if HW active or not */
> +	cg_status = readl(dev->reg_base[VDEC_COMP_SYS]);
> +	if ((cg_status & VDEC_HW_ACTIVE) != 0) {

The "!= 0" can be dropped here, since cg_status is unsigned.

> +		mtk_v4l2_err("vdec active is not 0x0 (0x%08x)",
> +			cg_status);
> +		return IRQ_HANDLED;
> +	}
> +
> +	dec_done_status = readl(vdec_misc_addr);
> +	if ((dec_done_status & MTK_VDEC_IRQ_STATUS_DEC_SUCCESS) !=
> +		MTK_VDEC_IRQ_STATUS_DEC_SUCCESS)

I suggest to fix the indentation here to increase human readability, like so:

	if ((dec_done_status & MTK_VDEC_IRQ_STATUS_DEC_SUCCESS) !=

	    MTK_VDEC_IRQ_STATUS_DEC_SUCCESS)


> +		return IRQ_HANDLED;
> +
> +	/* clear interrupt */
> +	writel(dec_done_status | VDEC_IRQ_CFG, vdec_misc_addr);
> +	writel(dec_done_status & ~VDEC_IRQ_CLR, vdec_misc_addr);
> +
> +	wake_up_ctx(ctx, MTK_INST_IRQ_RECEIVED);
> +
> +	mtk_v4l2_debug(3, "wake up ctx %d, dec_done_status=%x",
> +		ctx->id, dec_done_status);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int mtk_vdec_comp_init_irq(struct mtk_vdec_comp_dev *dev)
> +{
> +	struct platform_device *pdev = dev->plat_dev;
> +	int ret;
> +
> +	dev->dec_irq = platform_get_irq(pdev, 0);
> +	if (dev->dec_irq < 0) {
> +		dev_err(&pdev->dev, "Failed to get irq resource");
> +		return dev->dec_irq;
> +	}
> +
> +	irq_set_status_flags(dev->dec_irq, IRQ_NOAUTOEN);
> +	ret = devm_request_irq(&pdev->dev, dev->dec_irq,
> +				mtk_vdec_comp_irq_handler, 0, pdev->name, dev);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Failed to install dev->dec_irq %d (%d)",
> +			dev->dec_irq, ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int mtk_vdec_comp_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct mtk_vdec_comp_dev *comp_dev;
> +	struct mtk_vcodec_dev *master_dev;
> +	const struct of_device_id *of_id;
> +	int comp_idx;
> +	int ret;
> +
> +	if (!dev->parent) {
> +		dev_err(dev, "Vdec parent prob is not ready.");

This is not an error, since it's not a "critical" error, until it becomes one (so,
after max deferral count has been reached).
I would remove this message entirely, however, if you really want this message to
be here, you should use dev_dbg.

> +		return -EPROBE_DEFER;
> +	}
> +
> +	master_dev = dev_get_drvdata(dev->parent);
> +	if (!master_dev) {
> +		dev_err(dev, "Failed to get master device.");

Same here.

> +		return -EPROBE_DEFER;
> +	}
> +
> +	comp_dev = devm_kzalloc(dev, sizeof(*comp_dev), GFP_KERNEL);
> +	if (!comp_dev)
> +		return -ENOMEM;
> +
> +	comp_dev->plat_dev = pdev;
> +	ret = mtk_vcodec_init_dec_pm(pdev, &comp_dev->pm);
> +	if (ret) {
> +		dev_err(dev, "Failed to get mt vcodec clock source.");

As far as I can see, you have failure prints all over in function 
mtk_vcodec_init_dec_pm, so there's no need to add another print here:
you can simply return the error value here.

> +		return ret;
> +	}
> +
> +	comp_dev->reg_base[VDEC_COMP_MISC] =
> +		devm_platform_ioremap_resource_byname(pdev, "reg-misc");
> +	if (IS_ERR((__force void *)comp_dev->reg_base[VDEC_COMP_MISC])) {
> +		ret = PTR_ERR((__force void *)comp_dev->reg_base[VDEC_COMP_MISC]);
> +		goto err;
> +	}
> +
> +	ret = mtk_vdec_comp_init_irq(comp_dev);
> +	if (ret) {
> +		dev_err(dev, "Failed to register irq handler.\n");
> +		goto err;
> +	}

...and the same applies here: mtk_vdec_comp_init_irq already prints on its own.

> +
> +	of_id = of_match_device(mtk_vdec_comp_ids, dev);
> +	if (!of_id) {
> +		dev_err(dev, "Can't get vdec comp device id.\n");
> +		ret = -EINVAL;
> +		goto err;
> +	}
> +
> +	comp_idx = (enum mtk_vdec_hw_id)of_id->data;

Are you sure that this one is working as expected?
The only driver that registers compatibles mediatek,mtk-vcodec-lat and
mediatek,mtk-vcodec-core is exactly this one, but there's no .data assigned
to any of the of_device_id entries... and this means that your of_id->data
will not contain the expected value of type enum mtk_vdec_hw_id.

> +	if (comp_idx < MTK_VDEC_HW_MAX) {
> +		master_dev->comp_dev[comp_idx] = comp_dev;
> +		comp_dev->comp_idx = comp_idx;
> +		comp_dev->master_dev = master_dev;
> +		comp_dev->reg_base[VDEC_COMP_SYS] =
> +			master_dev->reg_base[VDEC_COMP_SYS];
> +		set_bit(comp_dev->comp_idx, master_dev->hardware_bitmap);
> +	}
> +
> +	platform_set_drvdata(pdev, comp_dev);
> +	return 0;
> +err:
> +	mtk_vcodec_release_dec_pm(&comp_dev->pm);
> +	return ret;
> +}
> +
> +MODULE_DEVICE_TABLE(of, mtk_vdec_comp_ids);
> +struct platform_driver mtk_vdec_comp_driver = {

The `_comp` here is a name that's making a logical reference to that: in this case,

that may confuse developers around. Can you please drop that `_comp`?

That would become `mtk_vdec_driver` instead.


Logically, the same applies for the rest - always assuming that it's referencing to
the Linux component API.

> +	.probe	= mtk_vdec_comp_probe,
> +	.driver	= {
> +		.name	= "mtk-vdec-comp",
> +		.of_match_table = mtk_vdec_comp_ids,
> +	},
> +};

Since you're using of_platform_populate, there is no need to register this driver
externally: you can simply register it here (module_platform_driver) and it will
be probed at of_platform_populate time in your parent.

> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_hw.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_hw.h
> new file mode 100644
> index 000000000000..8d6e818a3474
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_hw.h
> @@ -0,0 +1,49 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2021 MediaTek Inc.
> + * Author: Yunfei Dong <yunfei.dong@...iatek.com>
> + */
> +
> +#ifndef _MTK_VCODEC_DEC_HW_H_
> +#define _MTK_VCODEC_DEC_HW_H_
> +
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +
> +#include "mtk_vcodec_drv.h"
> +
> +#define VDEC_HW_ACTIVE	0x10
> +#define VDEC_IRQ_CFG	0x11
> +#define VDEC_IRQ_CLR	0x10
> +#define VDEC_IRQ_CFG_REG	0xa4

Cosmetic nitpick: either all values in the same column, or simply use a space
instead of tabulations.

> +
> +/**
> + * enum mtk_comp_hw_reg_idx - component register base index
> + */
> +enum mtk_comp_hw_reg_idx {
> +	VDEC_COMP_SYS,
> +	VDEC_COMP_MISC,
> +	VDEC_COMP_MAX
> +};
> +
> +/**
> + * struct mtk_vdec_comp_dev - component framwork driver data

You've switched away from the component framework... so this structure's
description seems to be a bit misleading now...

> + * @plat_dev: platform device
> + * @master_dev: master device
> + * @reg_base: Mapped address of MTK Vcodec registers.
> + *
> + * @dec_irq: decoder irq resource
> + * @pm: power management control
> + * @comp_idx: component index
> + */
> +struct mtk_vdec_comp_dev {
> +	struct platform_device *plat_dev;
> +	struct mtk_vcodec_dev *master_dev;
> +	void __iomem *reg_base[VDEC_COMP_MAX];
> +
> +	int dec_irq;
> +	struct mtk_vcodec_pm pm;
> +	int comp_idx;
> +};
> +
> +#endif /* _MTK_VCODEC_DEC_HW_H_ */
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateful.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateful.c
> index 59c24b22ab6d..4f9a80ce15d8 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateful.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateful.c
> @@ -623,4 +623,5 @@ const struct mtk_vcodec_dec_pdata mtk_vdec_8173_pdata = {
>   	.num_framesizes = NUM_SUPPORTED_FRAMESIZE,
>   	.worker = mtk_vdec_worker,
>   	.flush_decoder = mtk_vdec_flush_decoder,
> +	.is_comp_supported = false,
>   };
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c
> index 8f4a1f0a0769..762633572b49 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c
> @@ -357,4 +357,5 @@ const struct mtk_vcodec_dec_pdata mtk_vdec_8183_pdata = {
>   	.uses_stateless_api = true,
>   	.worker = mtk_vdec_worker,
>   	.flush_decoder = mtk_vdec_flush_decoder,
> +	.is_comp_supported = false,

component is not supported anywhere, since you've switched away from it?!

>   };
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> index 973b0b3649c6..ec3850b4c638 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> @@ -93,6 +93,17 @@ enum mtk_fmt_type {
>   	MTK_FMT_FRAME = 2,
>   };
>   
> +/**
> + * struct mtk_vdec_hw_id - Hardware index used to separate
> + *                         different hardware
> + */
> +enum mtk_vdec_hw_id {
> +	MTK_VDEC_CORE,
> +	MTK_VDEC_LAT0,
> +	MTK_VDEC_LAT1,
> +	MTK_VDEC_HW_MAX,
> +};
> +
>   /*
>    * struct mtk_video_fmt - Structure used to store information about pixelformats
>    */
> @@ -331,6 +342,7 @@ enum mtk_chip {
>    *
>    * @chip: chip this decoder is compatible with
>    *
> + * @is_comp_supported: true: using compoent framework, false: not support
>    * @uses_stateless_api: whether the decoder uses the stateless API with requests
>    */
>   
> @@ -352,6 +364,7 @@ struct mtk_vcodec_dec_pdata {
>   
>   	enum mtk_chip chip;
>   
> +	bool is_comp_supported;

Adding this member looks useless: there's nothing declaring is_comp_supported as
true... not here, not in any other patch of this entire series!


Regards,
- Angelo

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