1. Patchew
  2. linux
  3. [PATCH RFC 0/8] media: camss: Add support for C-PHY configuration on Qualcomm platforms
  4. View patch

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

David Heidelberg via B4 Relay posted 8 patches 3 months ago
There is a newer version of this series
[PATCH RFC 5/8] media: qcom: camss: Initialize lanes after lane configuration is available
Posted by David Heidelberg via B4 Relay 3 months ago 
From: Petr Hodina <phodina@protonmail.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@protonmail.com>
Signed-off-by: David Heidelberg <david@ixit.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;
 	}
 

-- 
2.51.0
Re: [PATCH RFC 5/8] media: qcom: camss: Initialize lanes after lane configuration is available
Posted by Bryan O'Donoghue 3 months ago 
On 09/11/2025 09:39, David Heidelberg via B4 Relay wrote:
> From: Petr Hodina <phodina@protonmail.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@protonmail.com>
> Signed-off-by: David Heidelberg <david@ixit.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@linaro.org>

Patchew 2.1-devel-b67e4c2

© 2016 - 2026 Red Hat, Inc.