linux-kernel - Re: [PATCH] media: qcom: camss: Use a macro to specify the initial buffer count

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <06043c1b-b261-4469-b897-66e8173588ab@linaro.org>
Date: Wed, 15 Oct 2025 09:24:21 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Hangxiang Ma <hangxiang.ma@....qualcomm.com>,
 Loic Poulain <loic.poulain@....qualcomm.com>, Robert Foss
 <rfoss@...nel.org>, Andi Shyti <andi.shyti@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Todor Tomov <todor.too@...il.com>,
 Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-i2c@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-media@...r.kernel.org
Subject: Re: [PATCH] media: qcom: camss: Use a macro to specify the initial
 buffer count

On 15/10/2025 03:42, Hangxiang Ma wrote:
> Replace the hardcoded buffer count value with a macro to enable
> operating on these buffers elsewhere in the CAMSS driver based on this
> count. Some of the hardware architectures require deferring the AUP and
> REG update until after the CSID configuration and this macro is expected
> to be useful in such scenarios.
> 
> Signed-off-by: Hangxiang Ma <hangxiang.ma@....qualcomm.com>
> ---
> This change use a global macro to specify the initial buffer count. It
> meets the requirement that some hardware architectures need to defer the
> AUP and REG update to CSID configuration stage.
> ---
>   drivers/media/platform/qcom/camss/camss-vfe.c | 2 +-
>   drivers/media/platform/qcom/camss/camss.h     | 1 +
>   2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
> index 09b29ba383f1..2753c2bb6c04 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe.c
> @@ -541,7 +541,7 @@ int vfe_enable_output_v2(struct vfe_line *line)
>   
>   	ops->vfe_wm_start(vfe, output->wm_idx[0], line);
>   
> -	for (i = 0; i < 2; i++) {
> +	for (i = 0; i < CAMSS_INIT_BUF_COUNT; i++) {
>   		output->buf[i] = vfe_buf_get_pending(output);
>   		if (!output->buf[i])
>   			break;
> diff --git a/drivers/media/platform/qcom/camss/camss.h b/drivers/media/platform/qcom/camss/camss.h
> index a70fbc78ccc3..901f84efaf7d 100644
> --- a/drivers/media/platform/qcom/camss/camss.h
> +++ b/drivers/media/platform/qcom/camss/camss.h
> @@ -41,6 +41,7 @@
>   	(to_camss_index(ptr_module, index)->dev)
>   
>   #define CAMSS_RES_MAX 17
> +#define CAMSS_INIT_BUF_COUNT 2
>   
>   struct camss_subdev_resources {
>   	char *regulators[CAMSS_RES_MAX];
> 
> ---
> base-commit: 59a69ef338920ca6a5bca3ec0e13ce32809cea23
> change-id: 20251012-use-marco-to-denote-image-buffer-number-cbec071b8436
> 
> Best regards,
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>