linux-kernel - Re: [PATCH RFC/WIP v2 7/9] media: qcom: camss: Add support for CSID for sa8775p

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Message-ID: <fd4a66f6-1d64-4047-b6ea-cbcf6720ef70@quicinc.com>
Date: Sat, 10 May 2025 13:28:19 +0530
From: Suresh Vankadara <quic_svankada@...cinc.com>
To: Vikram Sharma <quic_vikramsa@...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>, <andersson@...nel.org>,
        <konradybcio@...nel.org>, <hverkuil-cisco@...all.nl>,
        <cros-qcom-dts-watchers@...omium.org>, <catalin.marinas@....com>,
        <will@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-media@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC/WIP v2 7/9] media: qcom: camss: Add support for CSID
 for sa8775p



On 4/27/2025 12:31 PM, Vikram Sharma wrote:
> The CSID in sa8775p is version 690, This csid is different from
> csid 780 w.r.t few bit-fields.
> 
> Co-developed-by: Suresh Vankadara <quic_svankada@...cinc.com>
> Signed-off-by: Suresh Vankadara <quic_svankada@...cinc.com>
> Signed-off-by: Vikram Sharma <quic_vikramsa@...cinc.com>
> ---
>   .../platform/qcom/camss/camss-csid-gen3.c     |  31 +++-
>   drivers/media/platform/qcom/camss/camss.c     | 151 ++++++++++++++++++
>   2 files changed, 175 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-csid-gen3.c b/drivers/media/platform/qcom/camss/camss-csid-gen3.c
> index b66105f7b901..4f9471523a08 100644
> --- a/drivers/media/platform/qcom/camss/camss-csid-gen3.c
> +++ b/drivers/media/platform/qcom/camss/camss-csid-gen3.c
> @@ -48,8 +48,12 @@
>   #define CSID_CSI2_RX_IRQ_CLEAR		0xA4
>   #define CSID_CSI2_RX_IRQ_SET		0xA8
>   
> +#define IS_CSID_690(csid)	(csid->camss->res->version ==\
> +					CAMSS_8775P ? true : false)
>   #define CSID_BUF_DONE_IRQ_STATUS	0x8C
> -#define		BUF_DONE_IRQ_STATUS_RDI_OFFSET	(csid_is_lite(csid) ? 1 : 14)
> +#define BUF_DONE_IRQ_STATUS_RDI_OFFSET  (csid_is_lite(csid) ?\
> +						1 : (IS_CSID_690(csid) ?\
> +						13 : 14))
This becomes more complex if more number of chipsets under csid gen3 are 
added.inline function helps for readability. It should return with 1, 13 
or 14. This comment is applicable at all places in csid.

>   
> -#define CSID_RDI_IRQ_SUBSAMPLE_PATTERN(rdi)	(0x548 + 0x100 * (rdi))
> -#define CSID_RDI_IRQ_SUBSAMPLE_PERIOD(rdi)	(0x54C + 0x100 * (rdi))
> -
> +#define CSID_RDI_IRQ_SUBSAMPLE_PATTERN(rdi)	(csid_is_lite(csid) && IS_CSID_690(csid) ?\
> +							(0x348 + 0x100 * (rdi)) :\
> +							(0x548 + 0x100 * (rdi)))
> +#define CSID_RDI_IRQ_SUBSAMPLE_PERIOD(rdi)	(csid_is_lite(csid) && IS_CSID_690(csid) ?\
> +							(0x34C + 0x100 * (rdi)) :\
> +							(0x54C + 0x100 * (rdi)))
Subsample pattern is not used in driver. Remove?

>   #define CSI2_RX_CFG0_PHY_SEL_BASE_IDX	1
>   
>   static void __csid_configure_rx(struct csid_device *csid,
> @@ -103,6 +117,9 @@ static void __csid_configure_rx(struct csid_device *csid,
>   	val |= phy->lane_assign << CSI2_RX_CFG0_DL0_INPUT_SEL;
>   	val |= (phy->csiphy_id + CSI2_RX_CFG0_PHY_SEL_BASE_IDX) << CSI2_RX_CFG0_PHY_NUM_SEL;
>   
> +	if (IS_CSID_690(csid) && (vc > 3))
> +		val |= 1 << CSI2_RX_CFG0_VC_MODE;
Is VC greater than 3? in which case?

> +static const struct camss_subdev_resources csid_res_8775p[] = {
> +	/* CSID0 */
> +	{
> +		.regulators = {},
> +
> +		.clock = { "csid", "csiphy_rx"},
> +		.clock_rate = {
> +			{ 400000000, 400000000},
> +			{ 400000000, 400000000}
> +		},
> +
> +		.reg = { "csid0", "csid_top" },
Align name with DTS for csid_top. Comment is applicable for all 
instances for this target.

> +	/* CSID2 (lite) */
> +	{
> +		.regulators = {},
> +
> +		.clock = { "cpas_ife_lite", "vfe_lite_ahb",
> +			   "vfe_lite_csid", "vfe_lite_cphy_rx",
> +			   "vfe_lite"},
Align with DTS comment in clock name. Applicable for all CSID lites for 
this target.


Regards,
Suresh Vankadara.