linux-kernel - Re: [PATCH RFC 4/8] media: qcom: camss: Prepare CSID for C-PHY support

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Message-ID: <c36134aa-a41d-47be-8eee-36cbe5435c7c@ixit.cz>
Date: Mon, 1 Dec 2025 21:30:14 +0100
From: David Heidelberg <david@...t.cz>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Robert Foss <rfoss@...nel.org>, Todor Tomov <todor.too@...il.com>,
 Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Luca Weiss <luca.weiss@...rphone.com>, Petr Hodina <phodina@...tonmail.com>,
 Casey Connolly <casey.connolly@...aro.org>, "Dr. Git" <drgitx@...il.com>
Cc: Joel Selvaraj <foss@...lselvaraj.com>, linux-media@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
 phone-devel@...r.kernel.org
Subject: Re: [PATCH RFC 4/8] media: qcom: camss: Prepare CSID for C-PHY
 support

On 10/11/2025 12:37, Bryan O'Donoghue wrote:
> On 09/11/2025 09:39, David Heidelberg via B4 Relay wrote:
>> From: David Heidelberg <david@...t.cz>
>>
>> Inherit C-PHY information from CSIPHY, so we can configure CSID
>> properly.
>>
>> CSI2_RX_CFG0_PHY_TYPE_SEL must be set to 1, when C-PHY mode is used.
>>
>> Signed-off-by: David Heidelberg <david@...t.cz>
>> ---
>>   drivers/media/platform/qcom/camss/camss-csid-gen2.c | 1 +
>>   drivers/media/platform/qcom/camss/camss-csid.c      | 1 +
>>   drivers/media/platform/qcom/camss/camss-csid.h      | 1 +
>>   3 files changed, 3 insertions(+)
>>
>> diff --git a/drivers/media/platform/qcom/camss/camss-csid-gen2.c b/ 
>> drivers/media/platform/qcom/camss/camss-csid-gen2.c
>> index 2a1746dcc1c5b..033036ae28a4f 100644
>> --- a/drivers/media/platform/qcom/camss/camss-csid-gen2.c
>> +++ b/drivers/media/platform/qcom/camss/camss-csid-gen2.c
>> @@ -183,6 +183,7 @@ static void __csid_configure_rx(struct csid_device 
>> *csid,
>>       val = (lane_cnt - 1) << CSI2_RX_CFG0_NUM_ACTIVE_LANES;
>>       val |= phy->lane_assign << CSI2_RX_CFG0_DL0_INPUT_SEL;
>>       val |= phy->csiphy_id << CSI2_RX_CFG0_PHY_NUM_SEL;
>> +    val |= csid->phy.cphy << CSI2_RX_CFG0_PHY_TYPE_SEL;
>>       writel_relaxed(val, csid->base + CSID_CSI2_RX_CFG0);
>>       val = 1 << CSI2_RX_CFG1_PACKET_ECC_CORRECTION_EN;
>> diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/ 
>> media/platform/qcom/camss/camss-csid.c
>> index 5284b5857368c..68adea33cc719 100644
>> --- a/drivers/media/platform/qcom/camss/camss-csid.c
>> +++ b/drivers/media/platform/qcom/camss/camss-csid.c
>> @@ -1287,6 +1287,7 @@ static int csid_link_setup(struct media_entity 
>> *entity,
>>           csid->phy.csiphy_id = csiphy->id;
>>           lane_cfg = &csiphy->cfg.csi2->lane_cfg;
>> +        csid->phy.cphy = lane_cfg->cphy;
>>           csid->phy.lane_cnt = lane_cfg->num_data;
>>           csid->phy.lane_assign = csid_get_lane_assign(lane_cfg);
>>       }
>> diff --git a/drivers/media/platform/qcom/camss/camss-csid.h b/drivers/ 
>> media/platform/qcom/camss/camss-csid.h
>> index aedc96ed84b2f..a82db31bd2335 100644
>> --- a/drivers/media/platform/qcom/camss/camss-csid.h
>> +++ b/drivers/media/platform/qcom/camss/camss-csid.h
>> @@ -70,6 +70,7 @@ struct csid_phy_config {
>>       u32 lane_assign;
>>       u32 en_vc;
>>       u8 need_vc_update;
>> +    bool cphy;
>>   };
>>   struct csid_device;
>>
> 
> I'm not convinced you need another flag for this. It should be possible 
> for the CSID to get a pointer to the PHY and interrogate the encoded mode.

I'm not seeing elegant way to do this, if you look below my change 
above, others attributes are taken into csid_phy_config in similar way.

Or maybe I'm not seeing some easy/clean way here?

David

> 
> ---
> bod

-- 
David Heidelberg