linux-kernel - Re: [PATCH 11/16] dmaengine: ti: k3-psil-j721e: Add entry for CSI2RX

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Date:   Tue, 6 Apr 2021 22:25:56 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Péter Ujfalusi <peter.ujfalusi@...il.com>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Benoit Parrot <bparrot@...com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Alexandre Courbot <acourbot@...omium.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Helen Koike <helen.koike@...labora.com>,
        Michael Tretter <m.tretter@...gutronix.de>,
        Peter Chen <peter.chen@....com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-phy@...ts.infradead.org>,
        <dmaengine@...r.kernel.org>, Vignesh Raghavendra <vigneshr@...com>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: Re: [PATCH 11/16] dmaengine: ti: k3-psil-j721e: Add entry for CSI2RX

On 06/04/21 06:33PM, Péter Ujfalusi wrote:
> 
> 
> On 4/6/21 6:09 PM, Pratyush Yadav wrote:
> > On 04/04/21 04:24PM, Péter Ujfalusi wrote:
> >> Hi Pratyush,
> >>
> >> On 3/30/21 8:33 PM, Pratyush Yadav wrote:
> >>> The CSI2RX subsystem uses PSI-L DMA to transfer frames to memory. It can
> >>> have up to 32 threads but the current driver only supports using one. So
> >>> add an entry for that one thread.
> >>
> >> If you are absolutely sure that the other threads are not going to be
> >> used, then:
> > 
> > The opposite in fact. I do expect other threads to be used in the 
> > future. But the current driver can only use one so I figured it is 
> > better to add just the thread that is currently needed and then I can 
> > always add the rest later.
> > 
> > Why does this have to be a one-and-done deal? Is there anything wrong 
> > with adding the other threads when the driver can actually use them?
> 
> You can skip CCing DMAengine (and me ;) ). Less subsystems is the better
> when sending patches...

I'm a bit confused here. If you are no longer interested in maintaining 
the TI DMA drivers then that's fine, I can skip CCing you. But the patch 
is still relevant to the dmaengine list so why should I skip CCing it? 
And if I don't CC the dmaengine list then on which list would I get 
comments/reviews for the patch?

> 
> > 
> >> Acked-by: Peter Ujfalusi <peter.ujfalusi@...il.com>
> >>
> >> but I would consider adding the other threads if there is a chance that
> >> the cs2rx will need to support it in the future.
> >>
> >>> Signed-off-by: Pratyush Yadav <p.yadav@...com>
> >>> ---
> >>>  drivers/dma/ti/k3-psil-j721e.c | 10 ++++++++++
> >>>  1 file changed, 10 insertions(+)
> >>>
> >>> diff --git a/drivers/dma/ti/k3-psil-j721e.c b/drivers/dma/ti/k3-psil-j721e.c
> >>> index 7580870ed746..19ffa31e6dc6 100644
> >>> --- a/drivers/dma/ti/k3-psil-j721e.c
> >>> +++ b/drivers/dma/ti/k3-psil-j721e.c
> >>> @@ -58,6 +58,14 @@
> >>>  		},					\
> >>>  	}
> >>>  
> >>> +#define PSIL_CSI2RX(x)					\
> >>> +	{						\
> >>> +		.thread_id = x,				\
> >>> +		.ep_config = {				\
> >>> +			.ep_type = PSIL_EP_NATIVE,	\
> >>> +		},					\
> >>> +	}
> >>> +
> >>>  /* PSI-L source thread IDs, used for RX (DMA_DEV_TO_MEM) */
> >>>  static struct psil_ep j721e_src_ep_map[] = {
> >>>  	/* SA2UL */
> >>> @@ -138,6 +146,8 @@ static struct psil_ep j721e_src_ep_map[] = {
> >>>  	PSIL_PDMA_XY_PKT(0x4707),
> >>>  	PSIL_PDMA_XY_PKT(0x4708),
> >>>  	PSIL_PDMA_XY_PKT(0x4709),
> >>> +	/* CSI2RX */
> >>> +	PSIL_CSI2RX(0x4940),
> >>>  	/* CPSW9 */
> >>>  	PSIL_ETHERNET(0x4a00),
> >>>  	/* CPSW0 */
> >>>
> >>
> >> -- 
> >> Péter
> > 
> 
> -- 
> Péter

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.