linux-kernel - Re: [PATCH 2/2] media: qcom: camss: Restrict endpoint bus-type to D-PHY

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Message-ID: <9c89e6f4-a9af-4270-b266-537f3464ee32@linaro.org>
Date: Mon, 9 Dec 2024 12:32:04 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Luca Weiss <luca.weiss@...rphone.com>, Robert Foss <rfoss@...nel.org>,
 Todor Tomov <todor.too@...il.com>, Mauro Carvalho Chehab
 <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Barnabas Czeman <barnabas.czeman@...nlining.org>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>,
 Caleb Connolly <caleb.connolly@...aro.org>, David Heidelberg <david@...t.cz>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] media: qcom: camss: Restrict endpoint bus-type to
 D-PHY

On 09/12/2024 12:01, Luca Weiss wrote:
> Currently the Qualcomm CAMSS driver only supports D-PHY while the
> hardware on most SoCs also supports C-PHY. Until this support is added,
> check for D-PHY to make it somewhat explicit that C-PHY won't work.
> 
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
>   drivers/media/platform/qcom/camss/camss.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c
> index 9fb31f4c18adee886cd0bcf84438a8f27635e07f..b99af35074cdf6fa794a0d2f0d54ecf12ac354d9 100644
> --- a/drivers/media/platform/qcom/camss/camss.c
> +++ b/drivers/media/platform/qcom/camss/camss.c
> @@ -1855,6 +1855,15 @@ static int camss_of_parse_endpoint_node(struct device *dev,
>   	if (ret)
>   		return ret;
>   
> +	/*
> +	 * Most SoCs support both D-PHY and C-PHY standards, but currently only
> +	 * D-PHY is supported in the driver.
> +	 */
> +	if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) {
> +		dev_err(dev, "Unsupported bus type %d\n", vep.bus_type);
> +		return -EINVAL;
> +	}
> +
>   	csd->interface.csiphy_id = vep.base.port;
>   
>   	mipi_csi2 = &vep.bus.mipi_csi2;
> 

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