linux-kernel - Re: [PATCH RFC 5/8] media: qcom: camss: Initialize lanes after lane configuration is available

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Message-ID: <150cee0d-6c5f-4380-8c3b-ff29c4ca679b@linaro.org>
Date: Mon, 10 Nov 2025 11:38:51 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: david@...t.cz, Robert Foss <rfoss@...nel.org>,
 Todor Tomov <todor.too@...il.com>,
 Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Luca Weiss <luca.weiss@...rphone.com>, Petr Hodina <phodina@...tonmail.com>,
 Casey Connolly <casey.connolly@...aro.org>, "Dr. Git" <drgitx@...il.com>
Cc: Joel Selvaraj <foss@...lselvaraj.com>, linux-media@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
 phone-devel@...r.kernel.org
Subject: Re: [PATCH RFC 5/8] media: qcom: camss: Initialize lanes after lane
 configuration is available

On 09/11/2025 09:39, David Heidelberg via B4 Relay wrote:
> From: Petr Hodina <phodina@...tonmail.com>
> 
> The lanes must not be initialized before the driver has access to
> the lane configuration, as it depends on whether D-PHY or C-PHY mode
> is in use. Move the lane initialization to a later stage where the
> configuration structures are available.
> 
> Signed-off-by: Petr Hodina <phodina@...tonmail.com>
> Signed-off-by: David Heidelberg <david@...t.cz>
> ---
>   .../platform/qcom/camss/camss-csiphy-3ph-1-0.c     | 70 ++++++++++++----------
>   1 file changed, 37 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
> index 348b8cd18327e..c2adbde6b4e0d 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
> @@ -1101,6 +1101,42 @@ static void csiphy_lanes_enable(struct csiphy_device *csiphy,
>   	u8 val;
>   	int i;
>   
> +	switch (csiphy->camss->res->version) {
> +	case CAMSS_845:
> +		regs->lane_regs = &lane_regs_sdm845[0];
> +		regs->lane_array_size = ARRAY_SIZE(lane_regs_sdm845);
> +		break;
> +	case CAMSS_2290:
> +		regs->lane_regs = &lane_regs_qcm2290[0];
> +		regs->lane_array_size = ARRAY_SIZE(lane_regs_qcm2290);
> +		break;
> +	case CAMSS_7280:
> +	case CAMSS_8250:
> +		regs->lane_regs = &lane_regs_sm8250[0];
> +		regs->lane_array_size = ARRAY_SIZE(lane_regs_sm8250);
> +		break;
> +	case CAMSS_8280XP:
> +		regs->lane_regs = &lane_regs_sc8280xp[0];
> +		regs->lane_array_size = ARRAY_SIZE(lane_regs_sc8280xp);
> +		break;
> +	case CAMSS_X1E80100:
> +	case CAMSS_8550:
> +		regs->offset = 0x1000;
> +		break;
> +	case CAMSS_8650:
> +		regs->lane_regs = &lane_regs_sm8650[0];
> +		regs->lane_array_size = ARRAY_SIZE(lane_regs_sm8650);
> +		regs->offset = 0x1000;
> +		break;
> +	case CAMSS_8300:
> +	case CAMSS_8775P:
> +		regs->lane_regs = &lane_regs_sa8775p[0];
> +		regs->lane_array_size = ARRAY_SIZE(lane_regs_sa8775p);
> +		break;
> +	default:
> +		break;
> +	}
> +
>   	settle_cnt = csiphy_settle_cnt_calc(link_freq, csiphy->timer_clk_rate);
>   
>   	if (c->cphy) {
> @@ -1160,47 +1196,15 @@ static int csiphy_init(struct csiphy_device *csiphy)
>   		return -ENOMEM;
>   
>   	csiphy->regs = regs;
> -	regs->offset = 0x800;
>   
>   	switch (csiphy->camss->res->version) {
> -	case CAMSS_845:
> -		regs->lane_regs = &lane_regs_sdm845[0];
> -		regs->lane_array_size = ARRAY_SIZE(lane_regs_sdm845);
> -		break;
> -	case CAMSS_2290:
> -		regs->lane_regs = &lane_regs_qcm2290[0];
> -		regs->lane_array_size = ARRAY_SIZE(lane_regs_qcm2290);
> -		break;
> -	case CAMSS_7280:
> -	case CAMSS_8250:
> -		regs->lane_regs = &lane_regs_sm8250[0];
> -		regs->lane_array_size = ARRAY_SIZE(lane_regs_sm8250);
> -		break;
> -	case CAMSS_8280XP:
> -		regs->lane_regs = &lane_regs_sc8280xp[0];
> -		regs->lane_array_size = ARRAY_SIZE(lane_regs_sc8280xp);
> -		break;
>   	case CAMSS_X1E80100:
> -		regs->lane_regs = &lane_regs_x1e80100[0];
> -		regs->lane_array_size = ARRAY_SIZE(lane_regs_x1e80100);
> -		regs->offset = 0x1000;
> -		break;
>   	case CAMSS_8550:
> -		regs->lane_regs = &lane_regs_sm8550[0];
> -		regs->lane_array_size = ARRAY_SIZE(lane_regs_sm8550);
> -		regs->offset = 0x1000;
> -		break;
>   	case CAMSS_8650:
> -		regs->lane_regs = &lane_regs_sm8650[0];
> -		regs->lane_array_size = ARRAY_SIZE(lane_regs_sm8650);
>   		regs->offset = 0x1000;
>   		break;
> -	case CAMSS_8300:
> -	case CAMSS_8775P:
> -		regs->lane_regs = &lane_regs_sa8775p[0];
> -		regs->lane_array_size = ARRAY_SIZE(lane_regs_sa8775p);
> -		break;
>   	default:
> +		regs->offset = 0x800;
>   		break;
>   	}
>   
> 

Agreement in principle.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>