linux-kernel - Re: [PATCH v3 12/15] media: qcom: camss: Fix support for setting CSIPHY clock name csiphyX

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Date:   Sat, 26 Aug 2023 12:13:46 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>, rfoss@...nel.org,
        todor.too@...il.com, agross@...nel.org, andersson@...nel.org,
        mchehab@...nel.org, hverkuil-cisco@...all.nl,
        laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com,
        andrey.konovalov@...aro.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 12/15] media: qcom: camss: Fix support for setting
 CSIPHY clock name csiphyX

On 23.08.2023 12:44, Bryan O'Donoghue wrote:
> Several of our upstream and soon-to-be upstream SoC CAMSS dtsi declare
> csiphyX as opposed to the older clock name csiX_phy.
This only reinforces my point about adding like csiphy_clks or so

Konrad
> 
> Right now the CAMSS code will fail to set the csiphyX clock even if we have
> declared it in our list of clocks. For sdm845 and sm8250 we appear to "get
> away" with this error, however on sc8280xp we don't.
> 
> The right approach here is to set the clock when it is declared. If a SoC
> doesn't require or a SoC driver implementer doesn't think we need, then the
> clock ought to simply be omitted from the clock list.
> 
> Include csiphyX in the set of permissible strings which will subsequently
> lead to the csiphyX clock being set during csiphy_set_clock_rates() phase.
> 
> sdm845 and sm8250 will work with the code as-is so I've omitted this from a
> suggested Fixes list.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
>  drivers/media/platform/qcom/camss/camss-csiphy.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
> index baf78c525fbfc..d9c751f457703 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy.c
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
> @@ -687,6 +687,10 @@ int msm_csiphy_subdev_init(struct camss *camss,
>  				if (csiphy->rate_set[i])
>  					break;
>  			}
> +
> +			csiphy->rate_set[i] = csiphy_match_clock_name(clock->name, "csiphy%d", k);
> +			if (csiphy->rate_set[i])
> +				break;
>  		}
>  	}
>