linux-kernel - Re: [PATCH v2 8/8] media: qcom: camss: Add sm8550 support

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Date: Wed, 20 Mar 2024 16:01:41 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Depeng Shao <quic_depengs@...cinc.com>, rfoss@...nel.org,
 todor.too@...il.com, andersson@...nel.org, konrad.dybcio@...aro.org,
 mchehab@...nel.org, quic_yon@...cinc.com
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 8/8] media: qcom: camss: Add sm8550 support

On 20/03/2024 14:11, Depeng Shao wrote:
> Add in functional logic throughout the code to support the SM8550.
> 
> Signed-off-by: Depeng Shao <quic_depengs@...cinc.com>
> ---
>   .../media/platform/qcom/camss/camss-csid.c    | 19 +++++++++++++++++++
>   .../media/platform/qcom/camss/camss-csiphy.c  |  1 +
>   drivers/media/platform/qcom/camss/camss-vfe.c |  7 +++++++
>   .../media/platform/qcom/camss/camss-video.c   |  1 +
>   4 files changed, 28 insertions(+)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/media/platform/qcom/camss/camss-csid.c
> index eb27d69e89a1..e9203dc15798 100644
> --- a/drivers/media/platform/qcom/camss/camss-csid.c
> +++ b/drivers/media/platform/qcom/camss/camss-csid.c
> @@ -590,6 +590,25 @@ int msm_csid_subdev_init(struct camss *camss, struct csid_device *csid,
>   			csid->base = camss->vfe[id].base + VFE_480_LITE_CSID_OFFSET;
>   		else
>   			csid->base = camss->vfe[id].base + VFE_480_CSID_OFFSET;
> +	} else if (camss->res->version == CAMSS_8550) {
> +		/* for titan 780, CSID lite registers are inside the VFE lite region,
> +		 * between the VFE "top" and "bus" registers. this requires
> +		 * VFE to be initialized before CSID
> +		 */
> +		if (id >= 2)
> +			csid->base = camss->vfe[id].base;

Hard-coded magic numbers are definitely out.

If you need to differentiate - please include something in the struct 
resources so that the flag is always available and we don't have to 
start doing funky magic index/magic number gymnastics.

> +		else {
> +			csid->base =
> +				devm_platform_ioremap_resource_byname(pdev, res->reg[0]);
> +			if (id != 0)
> +				csid->top_base = camss->csid[0].top_base;
> +			else
> +				csid->top_base =
> +					devm_platform_ioremap_resource_byname(pdev, res->reg[1]);
> +		}

What is the point of hooking the TOP base just to clear our the status 
registers ?

We take no meaningful action in the ISR that I can see.


> +
> +		if (IS_ERR(csid->base))
> +			return PTR_ERR(csid->base);
>   	} else {
>   		csid->base = devm_platform_ioremap_resource_byname(pdev, res->reg[0]);
>   		if (IS_ERR(csid->base))
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
> index 45b3a8e5dea4..f35af0dd2147 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy.c
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
> @@ -579,6 +579,7 @@ int msm_csiphy_subdev_init(struct camss *camss,
>   	case CAMSS_845:
>   	case CAMSS_8250:
>   	case CAMSS_8280XP:
> +	case CAMSS_8550:
>   		csiphy->formats = csiphy_formats_sdm845;
>   		csiphy->nformats = ARRAY_SIZE(csiphy_formats_sdm845);
>   		break;
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
> index d875237cf244..ff115c5521c6 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe.c
> @@ -226,6 +226,7 @@ static u32 vfe_src_pad_code(struct vfe_line *line, u32 sink_code,
>   	case CAMSS_845:
>   	case CAMSS_8250:
>   	case CAMSS_8280XP:
> +	case CAMSS_8550:
>   		switch (sink_code) {
>   		case MEDIA_BUS_FMT_YUYV8_1X16:
>   		{
> @@ -296,6 +297,10 @@ int vfe_reset(struct vfe_device *vfe)
>   
>   	reinit_completion(&vfe->reset_complete);
>   
> +	// The reset has been moved to csid in 8550

Please run checkpatch.pl on your code before submission C++ are not allowed.

---
bod