linux-kernel - Re: [PATCH] media: hantro: Use core-generated bus

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Message-ID: <CAHCN7xJfR34WxigZSYcntWOsry4sc8ZJ9_T1comd0R5Z5Na7vA@mail.gmail.com>
Date:   Tue, 20 Dec 2022 13:38:47 -0600
From:   Adam Ford <aford173@...il.com>
To:     Chen-Yu Tsai <wenst@...omium.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: hantro: Use core-generated bus_info value

On Fri, Dec 16, 2022 at 7:46 AM Chen-Yu Tsai <wenst@...omium.org> wrote:
>
> The Hantro driver uses a hardcoded value for the bus_info field in the
> media device and |struct v4l2_capability|. This worked well when there
> was just one device. However with the iMX.8 series we are now seeing
> two Hantro blocks on the same chip. The static bus_info is no longer
> sufficient for differentiating devices.
>
> Since commit f2d8b6917f3b ("media: v4l: ioctl: Set bus_info in
> v4l_querycap()"), the V4L2 core provides a default value for the
> bus_info field for platform and PCI devices. This value will match
> the default value for media devices added by commit cef699749f37
> ("media: mc: Set bus_info in media_device_init()"). These defaults
> are stable and device-specific.
>
> Drop the static bus_info values from the hantro driver and use the
> defaults.
>
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> ---
>  arch/arm64/boot/dts/freescale/Makefile           | 1 +
>  drivers/media/platform/verisilicon/hantro_drv.c  | 2 --
>  drivers/media/platform/verisilicon/hantro_v4l2.c | 2 --
>  3 files changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
> index ef6f364eaa18..ef815442c78b 100644
> --- a/arch/arm64/boot/dts/freescale/Makefile
> +++ b/arch/arm64/boot/dts/freescale/Makefile
> @@ -55,6 +55,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-data-modul-edm-sbc.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mm-ddr4-evk.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mm-emcon-avari.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mm-evk.dtb
> +dtb-$(CONFIG_ARCH_MXC) += imx8mm-hummingboard-pulse.dtb

I think the makefile was edited by mistake.

>  dtb-$(CONFIG_ARCH_MXC) += imx8mm-icore-mx8mm-ctouch2.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mm-icore-mx8mm-edimm2.2.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mm-innocomm-wb15-evk.dtb
> diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
> index 8cb4a68c9119..b0aeedae7b65 100644
> --- a/drivers/media/platform/verisilicon/hantro_drv.c
> +++ b/drivers/media/platform/verisilicon/hantro_drv.c
> @@ -1050,8 +1050,6 @@ static int hantro_probe(struct platform_device *pdev)
>
>         vpu->mdev.dev = vpu->dev;
>         strscpy(vpu->mdev.model, DRIVER_NAME, sizeof(vpu->mdev.model));
> -       strscpy(vpu->mdev.bus_info, "platform: " DRIVER_NAME,
> -               sizeof(vpu->mdev.bus_info));
>         media_device_init(&vpu->mdev);
>         vpu->mdev.ops = &hantro_m2m_media_ops;
>         vpu->v4l2_dev.mdev = &vpu->mdev;
> diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
> index 2c7a805289e7..c1a116031013 100644
> --- a/drivers/media/platform/verisilicon/hantro_v4l2.c
> +++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
> @@ -142,8 +142,6 @@ static int vidioc_querycap(struct file *file, void *priv,
>
>         strscpy(cap->driver, vpu->dev->driver->name, sizeof(cap->driver));
>         strscpy(cap->card, vdev->name, sizeof(cap->card));
> -       snprintf(cap->bus_info, sizeof(cap->bus_info), "platform: %s",
> -                vpu->dev->driver->name);
>         return 0;
>  }
>
> --
> 2.39.0.314.g84b9a713c41-goog
>