linux-kernel - Re: [PATCH v0 8/9] media: qcom: camss: Fix set CSI2_RX_CFG1_VC

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Date:   Mon, 21 Aug 2023 11:53:53 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>, rfoss@...nel.org,
        todor.too@...il.com, agross@...nel.org, andersson@...nel.org,
        konrad.dybcio@...aro.org, mchehab@...nel.org,
        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, stable@...r.kernel.org
Subject: Re: [PATCH v0 8/9] media: qcom: camss: Fix set CSI2_RX_CFG1_VC_MODE
 when VC is greater than 3

Hi Bryan,

On 14/08/2023 16:10, Bryan O'Donoghue wrote:
> VC_MODE = 0 implies a two bit VC address.
> VC_MODE = 1 is required for VCs with a larger address than two bits.

This explains the second chunk in the patch below, but it doesn't explain
why dt_id is now suddenly vc * 4 instead of vc.

I don't feel comfortable merging this patch since I'm not sure if that
dt_id change was perhaps an error.

If the change IS correct, then please reply and provide a better commit
log.

Regards,

	Hans

> 
> Fixes: eebe6d00e9bf ("media: camss: Add support for CSID hardware version Titan 170")
> Cc: stable@...r.kernel.org
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
>  drivers/media/platform/qcom/camss/camss-csid-gen2.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-csid-gen2.c b/drivers/media/platform/qcom/camss/camss-csid-gen2.c
> index 45c7986d4a8d0..9ac253111e572 100644
> --- a/drivers/media/platform/qcom/camss/camss-csid-gen2.c
> +++ b/drivers/media/platform/qcom/camss/camss-csid-gen2.c
> @@ -352,7 +352,7 @@ static void __csid_configure_stream(struct csid_device *csid, u8 enable, u8 vc)
>  		phy_sel = csid->phy.csiphy_id;
>  
>  	if (enable) {
> -		u8 dt_id = vc;
> +		u8 dt_id = vc * 4;
>  
>  		if (tg->enabled) {
>  			/* Config Test Generator */
> @@ -449,6 +449,8 @@ static void __csid_configure_stream(struct csid_device *csid, u8 enable, u8 vc)
>  	writel_relaxed(val, csid->base + CSID_CSI2_RX_CFG0);
>  
>  	val = 1 << CSI2_RX_CFG1_PACKET_ECC_CORRECTION_EN;
> +	if (vc > 3)
> +		val |= 1 << CSI2_RX_CFG1_VC_MODE;
>  	val |= 1 << CSI2_RX_CFG1_MISR_EN;
>  	writel_relaxed(val, csid->base + CSID_CSI2_RX_CFG1);
>