linux-kernel - Re: [PATCH 08/16] media: qcom: camss: csid: Make TPG optional

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Message-ID: <124bb490-58d9-4c8c-a83f-7c3d45f61e43@linaro.org>
Date: Wed, 11 Dec 2024 01:44:45 +0200
From: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
To: Depeng Shao <quic_depengs@...cinc.com>, rfoss@...nel.org,
 todor.too@...il.com, bryan.odonoghue@...aro.org, mchehab@...nel.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org
Cc: quic_eberman@...cinc.com, linux-media@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel@...cinc.com
Subject: Re: [PATCH 08/16] media: qcom: camss: csid: Make TPG optional

Hi Depeng,

thank you for the changes and updates.

On 12/5/24 17:55, Depeng Shao wrote:
> From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> 
> The Test Pattern Generator TPG has been moved out of the CSID and into a
> standalone silicon block at the same level as a regular CSIPHY.
> 
> Make the TPG calls optional to reflect the fact some CSID blocks will now
> not implement this feature.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>

Please don't forget to add your Signed-off-by tag, if you pull someone's
changes.

> ---
>   .../media/platform/qcom/camss/camss-csid.c    | 33 ++++++++++++-------
>   1 file changed, 21 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/media/platform/qcom/camss/camss-csid.c
> index 6cf8e434dc05..2cb8c37982f8 100644
> --- a/drivers/media/platform/qcom/camss/camss-csid.c
> +++ b/drivers/media/platform/qcom/camss/camss-csid.c
> @@ -838,7 +838,7 @@ static void csid_try_format(struct csid_device *csid,
>   		break;
>   
>   	case MSM_CSID_PAD_SRC:
> -		if (csid->testgen_mode->cur.val == 0) {
> +		if (!csid->testgen_mode || csid->testgen_mode->cur.val == 0) {
>   			/* Test generator is disabled, */
>   			/* keep pad formats in sync */
>   			u32 code = fmt->code;
> @@ -1042,6 +1042,7 @@ static int csid_init_formats(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
>   static int csid_set_test_pattern(struct csid_device *csid, s32 value)
>   {
>   	struct csid_testgen_config *tg = &csid->testgen;
> +	const struct csid_hw_ops *hw_ops = csid->res->hw_ops;
>   
>   	/* If CSID is linked to CSIPHY, do not allow to enable test generator */
>   	if (value && media_pad_remote_pad_first(&csid->pads[MSM_CSID_PAD_SINK]))
> @@ -1049,7 +1050,10 @@ static int csid_set_test_pattern(struct csid_device *csid, s32 value)
>   
>   	tg->enabled = !!value;
>   
> -	return csid->res->hw_ops->configure_testgen_pattern(csid, value);
> +	if (hw_ops->configure_testgen_pattern)
> +		return -EOPNOTSUPP;
> +	else
> +		return hw_ops->configure_testgen_pattern(csid, value);

Last time I reported about the regression here, it is announced as fixed in the
changelog, but I see it is not, unfortunately.

>   }
>   
>   /*
> @@ -1267,7 +1271,7 @@ static int csid_link_setup(struct media_entity *entity,
>   
>   		/* If test generator is enabled */
>   		/* do not allow a link from CSIPHY to CSID */
> -		if (csid->testgen_mode->cur.val != 0)
> +		if (csid->testgen_mode && csid->testgen_mode->cur.val != 0)
>   			return -EBUSY;
>   
>   		sd = media_entity_to_v4l2_subdev(remote->entity);
> @@ -1366,15 +1370,20 @@ int msm_csid_register_entity(struct csid_device *csid,
>   		return ret;
>   	}
>   
> -	csid->testgen_mode = v4l2_ctrl_new_std_menu_items(&csid->ctrls,
> -				&csid_ctrl_ops, V4L2_CID_TEST_PATTERN,
> -				csid->testgen.nmodes, 0, 0,
> -				csid->testgen.modes);
> -
> -	if (csid->ctrls.error) {
> -		dev_err(dev, "Failed to init ctrl: %d\n", csid->ctrls.error);
> -		ret = csid->ctrls.error;
> -		goto free_ctrl;
> +	if (csid->res->hw_ops->configure_testgen_pattern) {
> +		csid->testgen_mode =
> +			v4l2_ctrl_new_std_menu_items(&csid->ctrls,
> +						     &csid_ctrl_ops,
> +						     V4L2_CID_TEST_PATTERN,
> +						     csid->testgen.nmodes, 0,
> +						     0, csid->testgen.modes);
> +
> +		if (csid->ctrls.error) {
> +			dev_err(dev, "Failed to init ctrl: %d\n",
> +				csid->ctrls.error);
> +			ret = csid->ctrls.error;
> +			goto free_ctrl;
> +		}
>   	}
>   
>   	csid->subdev.ctrl_handler = &csid->ctrls;

--
Best wishes,
Vladimir