linux-kernel - Re: [PATCH] media: venus: assign unique bus

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Message-ID: <e352c37c-90f6-4f52-8c24-baeae2883bf9@kernel.org>
Date: Sat, 22 Nov 2025 16:17:00 +0000
From: Bryan O'Donoghue <bod@...nel.org>
To: Jorge Ramirez-Ortiz <jorge.ramirez@....qualcomm.com>,
 vikash.garodia@....qualcomm.com, dikshita.agarwal@....qualcomm.com,
 mchehab@...nel.org
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: venus: assign unique bus_info strings for encoder
 and decoder

On 21/11/2025 18:43, Jorge Ramirez-Ortiz wrote:
> The Venus encoder and decoder video devices currently report the same
> bus_info string ("platform:qcom-venus").
> 
> Assign unique bus_info identifiers by appending ":dec" and ":enc" to the
> parent device name. With this change v4l2-ctl will display two separate
> logical devices
> 
> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@....qualcomm.com>
> ---
>   drivers/media/platform/qcom/venus/vdec.c | 5 +++++
>   drivers/media/platform/qcom/venus/venc.c | 5 +++++
>   2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> index 4a6641fdffcf..63f6ae1ff6ac 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -433,9 +433,14 @@ vdec_g_selection(struct file *file, void *fh, struct v4l2_selection *s)
>   static int
>   vdec_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
>   {
> +	struct venus_inst *inst = to_inst(file);
> +	struct venus_core *core = inst->core;
> +
>   	strscpy(cap->driver, "qcom-venus", sizeof(cap->driver));
>   	strscpy(cap->card, "Qualcomm Venus video decoder", sizeof(cap->card));
>   	strscpy(cap->bus_info, "platform:qcom-venus", sizeof(cap->bus_info));
> +	snprintf(cap->bus_info, sizeof(cap->bus_info),
> +		 "platform:%s:dec", dev_name(core->dev));
> 
>   	return 0;
>   }
> diff --git a/drivers/media/platform/qcom/venus/venc.c b/drivers/media/platform/qcom/venus/venc.c
> index b478b982a80d..520689f5533d 100644
> --- a/drivers/media/platform/qcom/venus/venc.c
> +++ b/drivers/media/platform/qcom/venus/venc.c
> @@ -144,9 +144,14 @@ static int venc_v4l2_to_hfi(int id, int value)
>   static int
>   venc_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
>   {
> +	struct venus_inst *inst = to_inst(file);
> +	struct venus_core *core = inst->core;
> +
>   	strscpy(cap->driver, "qcom-venus", sizeof(cap->driver));
>   	strscpy(cap->card, "Qualcomm Venus video encoder", sizeof(cap->card));
>   	strscpy(cap->bus_info, "platform:qcom-venus", sizeof(cap->bus_info));
> +	snprintf(cap->bus_info, sizeof(cap->bus_info),
> +		 "platform:%s:enc", dev_name(core->dev));
> 
>   	return 0;
>   }
> --
> 2.43.0
> 
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>