linux-kernel - Re: [PATCH v3 10/15] media: qcom: camss: Allow clocks vfeN vfe_liteN or vfe

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Message-ID: <20230828185534.GO14596@pendragon.ideasonboard.com>
Date:   Mon, 28 Aug 2023 21:55:34 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Cc:     rfoss@...nel.org, todor.too@...il.com, agross@...nel.org,
        andersson@...nel.org, konrad.dybcio@...aro.org, mchehab@...nel.org,
        hverkuil-cisco@...all.nl, sakari.ailus@...ux.intel.com,
        andrey.konovalov@...aro.org, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 10/15] media: qcom: camss: Allow clocks vfeN vfe_liteN
 or vfe_lite

On Wed, Aug 23, 2023 at 11:44:39AM +0100, Bryan O'Donoghue wrote:
> The number of Video Front End - VFE or Image Front End - IFE supported
> with new SoCs can vary both for the full and lite cases.
> 
> For example sdm845 has one vfe_lite and two vfe interfaces with the vfe
> clock called simply "vfe_lite" with no integer postfix. sc8280xp has four
> vfe and four vfe lite blocks.
> 
> We need to support the following clock name formats
> 
> - vfeN
> - vfe_liteN
> - vfe_lite
> 
> with N being any reasonably sized integer.
> 
> There are two sites in this code which need to do the same thing,
> constructing and matching strings with the pattern above, so encapsulate
> the logic in one function.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
>  drivers/media/platform/qcom/camss/camss-vfe.c | 22 ++++++++++++++-----
>  1 file changed, 16 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
> index 8f48401e31cd3..73380e75dbb22 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe.c
> @@ -437,6 +437,20 @@ void vfe_isr_reset_ack(struct vfe_device *vfe)
>  	complete(&vfe->reset_complete);
>  }
>  
> +static int vfe_match_clock_names(struct vfe_device *vfe,
> +				 struct camss_clock *clock)
> +{
> +	char vfe_name[CAMSS_RES_MAX];
> +	char vfe_lite_name[CAMSS_RES_MAX];
> +
> +	snprintf(vfe_name, sizeof(vfe_name), "vfe%d", vfe->id);
> +	snprintf(vfe_lite_name, sizeof(vfe_lite_name), "vfe_lite%d", vfe->id);
> +
> +	return (!strcmp(clock->name, vfe_name) ||
> +		!strcmp(clock->name, vfe_lite_name) ||
> +		!strcmp(clock->name, "vfe_lite"));

The code below will match "vfe0", "vfe1" and "vfe_lite", which the code
here matches "vfe%d", "vfe_life%d" and "vfe_lite". The commit message
doesn't explain why you can restrict the clock name to "vfe%d" instead
of matching both "vfe0" and "vfe1". I could try to guess, but it's
better to clarify it in the commit message.

> +}
> +
>  /*
>   * vfe_set_clock_rates - Calculate and set clock rates on VFE module
>   * @vfe: VFE device
> @@ -460,9 +474,7 @@ static int vfe_set_clock_rates(struct vfe_device *vfe)
>  	for (i = 0; i < vfe->nclocks; i++) {
>  		struct camss_clock *clock = &vfe->clock[i];
>  
> -		if (!strcmp(clock->name, "vfe0") ||
> -		    !strcmp(clock->name, "vfe1") ||
> -		    !strcmp(clock->name, "vfe_lite")) {
> +		if (vfe_match_clock_names(vfe, clock)) {
>  			u64 min_rate = 0;
>  			long rate;
>  
> @@ -543,9 +555,7 @@ static int vfe_check_clock_rates(struct vfe_device *vfe)
>  	for (i = 0; i < vfe->nclocks; i++) {
>  		struct camss_clock *clock = &vfe->clock[i];
>  
> -		if (!strcmp(clock->name, "vfe0") ||
> -		    !strcmp(clock->name, "vfe1") ||
> -		    !strcmp(clock->name, "vfe_lite")) {
> +		if (vfe_match_clock_names(vfe, clock)) {
>  			u64 min_rate = 0;
>  			unsigned long rate;
>  

-- 
Regards,

Laurent Pinchart