linux-kernel - Re: [PATCH 2/2] dmaengine: ti: k3-udma: Add TX channel data in AM62A CSIRX DMSS

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Message-ID: <20241125-hardener-jockey-d8d57f6a9430@spud>
Date: Mon, 25 Nov 2024 18:31:39 +0000
From: Conor Dooley <conor@...nel.org>
To: Vaishnav Achath <vaishnav.a@...com>
Cc: peter.ujfalusi@...il.com, vkoul@...nel.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	u-kumar1@...com, j-choudhary@...com, vigneshr@...com
Subject: Re: [PATCH 2/2] dmaengine: ti: k3-udma: Add TX channel data in AM62A
 CSIRX DMSS

On Mon, Nov 25, 2024 at 02:09:14PM +0530, Vaishnav Achath wrote:
> J722S/AM67 uses the same BCDMA CSIRX IP as AM62A, but it supports
> TX channels as well in addition to RX.

This doesn't make sense. You say that the am62a doesn't have a tx
channel ("but it supports TX as well") but then modify the struct for
the am62a to add a tx channel. Does that not break things on the am62a?


> Add the BCDMA TCHAN information
> in the am62a_dmss_csi_soc_data so as to support all the platforms in the
> family with same compatible. UDMA_CAP2_TCHAN_CNT indicates the presence
> of TX channels and it will be 0 for platforms without TX support.
> 
> Signed-off-by: Vaishnav Achath <vaishnav.a@...com>
> ---
> 
> CSI2RX capture test results on J722S EVM with IMX219:
> https://gist.github.com/vaishnavachath/e2eaed62ee8f53428ee9b830aaa02cc3
> 
>  drivers/dma/ti/k3-udma.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
> index b3f27b3f9209..4130f50979d4 100644
> --- a/drivers/dma/ti/k3-udma.c
> +++ b/drivers/dma/ti/k3-udma.c
> @@ -4340,6 +4340,8 @@ static struct udma_match_data j721e_mcu_data = {
>  
>  static struct udma_soc_data am62a_dmss_csi_soc_data = {
>  	.oes = {
> +		.bcdma_tchan_data = 0x800,
> +		.bcdma_tchan_ring = 0xa00,
>  		.bcdma_rchan_data = 0xe00,
>  		.bcdma_rchan_ring = 0x1000,
>  	},
> -- 
> 2.34.1
> 

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