linux-kernel - Re: [PATCH v2 05/12] media: rkvdec: Add per variant configuration

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Message-ID: <9fbc63d4-a12b-420e-8c99-f2f5fca5a9eb@kernel.org>
Date: Mon, 11 Aug 2025 08:13:04 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Detlev Casanova <detlev.casanova@...labora.com>,
 linux-kernel@...r.kernel.org
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
 Heiko Stuebner <heiko@...ech.de>, linux-media@...r.kernel.org,
 linux-rockchip@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 kernel@...labora.com
Subject: Re: [PATCH v2 05/12] media: rkvdec: Add per variant configuration

On 08/08/2025 22:03, Detlev Casanova wrote:
> This is to prepare for adding different variants of the decoder and

Prepare for...

> support specific formats and ops.
> 
> Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
> ---


...


>  static int rkvdec_init_ctrls(struct rkvdec_ctx *ctx)
>  {
> +	struct rkvdec_config *cfg = ctx->dev->config;
>  	unsigned int i, nctrls = 0;
>  	int ret;
>  
> -	for (i = 0; i < ARRAY_SIZE(rkvdec_coded_fmts); i++)
> -		nctrls += rkvdec_coded_fmts[i].ctrls->num_ctrls;
> +	for (i = 0; i < cfg->coded_fmts_num; i++)
> +		nctrls += cfg->coded_fmts[i].ctrls->num_ctrls;
>  
>  	v4l2_ctrl_handler_init(&ctx->ctrl_hdl, nctrls);
>  
> -	for (i = 0; i < ARRAY_SIZE(rkvdec_coded_fmts); i++) {
> -		ret = rkvdec_add_ctrls(ctx, rkvdec_coded_fmts[i].ctrls);
> +	for (i = 0; i < cfg->coded_fmts_num; i++) {
> +		ret = rkvdec_add_ctrls(ctx, cfg->coded_fmts[i].ctrls);
>  		if (ret)
>  			goto err_free_handler;
>  	}
> @@ -1119,8 +1127,13 @@ static void rkvdec_watchdog_func(struct work_struct *work)
>  	}
>  }
>  
> +const struct rkvdec_config config_rkvdec = {

Why isn't this static?

> +	.coded_fmts = (struct rkvdec_coded_fmt_desc *)rkvdec_coded_fmts,
> +	.coded_fmts_num = ARRAY_SIZE(rkvdec_coded_fmts),
> +};
> +
>  static const struct of_device_id of_rkvdec_match[] = {
> -	{ .compatible = "rockchip,rk3399-vdec" },
> +	{ .compatible = "rockchip,rk3399-vdec", .data = &config_rkvdec },
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, of_rkvdec_match);
> @@ -1144,6 +1157,9 @@ static int rkvdec_probe(struct platform_device *pdev)
>  	mutex_init(&rkvdec->vdev_lock);
>  	INIT_DELAYED_WORK(&rkvdec->watchdog_work, rkvdec_watchdog_func);
>  
> +	rkvdec->config =
> +		(struct rkvdec_config *)of_device_get_match_data(rkvdec->dev);

If you need a cast, your code is wrong.


Best regards,
Krzysztof