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Date:   Wed, 5 May 2021 12:34:35 +0100
From:   Jonathan Cameron <Jonathan.Cameron@Huawei.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
CC:     <linuxarm@huawei.com>, <mauro.chehab@huawei.com>,
        Ezequiel Garcia <ezequiel@collabora.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        <linux-kernel@vger.kernel.org>, <linux-media@vger.kernel.org>,
        <linux-rockchip@lists.infradead.org>,
        <linux-staging@lists.linux.dev>
Subject: Re: [PATCH 09/25] media: hantro: do a PM resume earlier
Message-ID: <20210505123435.00002065@Huawei.com>
In-Reply-To: <82114a4bd9c7bc1188c6a7167a6e74bb3360961d.1620207353.git.mchehab+huawei@kernel.org>
References: <cover.1620207353.git.mchehab+huawei@kernel.org>
        <82114a4bd9c7bc1188c6a7167a6e74bb3360961d.1620207353.git.mchehab+huawei@kernel.org>
Organization: Huawei Technologies Research and Development (UK) Ltd.
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On Wed, 5 May 2021 11:41:59 +0200
Mauro Carvalho Chehab <mchehab+huawei@kernel.org> wrote:

> The device_run() first enables the clock and then
> tries to resume PM runtime, checking for errors.
> 
> Well, if for some reason the pm_runtime can not resume,
> it would be better to detect it beforehand.
> 
> So, change the order inside device_run().
> 
> Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>
> Fixes: 775fec69008d ("media: add Rockchip VPU JPEG encoder driver")
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Does this move not result in a potential call of clk_bulk_disable() for clocks
that aren't enabled?

> ---
>  drivers/staging/media/hantro/hantro_drv.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/media/hantro/hantro_drv.c b/drivers/staging/media/hantro/hantro_drv.c
> index 595e82a82728..4387edaa1d0d 100644
> --- a/drivers/staging/media/hantro/hantro_drv.c
> +++ b/drivers/staging/media/hantro/hantro_drv.c
> @@ -152,13 +152,14 @@ static void device_run(void *priv)
>  	src = hantro_get_src_buf(ctx);
>  	dst = hantro_get_dst_buf(ctx);
>  
> -	ret = clk_bulk_enable(ctx->dev->variant->num_clocks, ctx->dev->clocks);
> -	if (ret)
> -		goto err_cancel_job;
>  	ret = pm_runtime_get_sync(ctx->dev->dev);
>  	if (ret < 0)
>  		goto err_cancel_job;
>  
> +	ret = clk_bulk_enable(ctx->dev->variant->num_clocks, ctx->dev->clocks);
> +	if (ret)
> +		goto err_cancel_job;
> +
>  	v4l2_m2m_buf_copy_metadata(src, dst, true);
>  
>  	ctx->codec_ops->run(ctx);