linux-kernel - Re: [PATCH 5/5] i2c: tegra: Do not configure DMA if not supported

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Message-ID: <b8f1dcd2ef330bbaf5fe7c17658edc49cc7a7545.camel@nvidia.com>
Date: Wed, 15 Jan 2025 11:42:40 +0000
From: Kartik Rajput <kkartik@...dia.com>
To: "thierry.reding@...il.com" <thierry.reding@...il.com>
CC: Laxman Dewangan <ldewangan@...dia.com>, Jon Hunter <jonathanh@...dia.com>,
	Akhil R <akhilrajeev@...dia.com>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "robh@...nel.org" <robh@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>, "andi.shyti@...nel.org"
	<andi.shyti@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>, "digetx@...il.com"
	<digetx@...il.com>, "linux-tegra@...r.kernel.org"
	<linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 5/5] i2c: tegra: Do not configure DMA if not supported

On Thu, 2025-01-09 at 11:33 +0100, Thierry Reding wrote:
> On Wed, Jan 08, 2025 at 04:36:20PM +0530, Kartik Rajput wrote:
> > On Tegra264, not all I2C controllers support DMA, this causes
> > failures
> > when function tegra_i2c_init_dma() is called.
> 
> What exactly does it mean when you say "not all I2C controllers
> support
> DMA"? Do they not have the necessary interface to the GPC DMA or are
> there not sufficient DMA channels to support all I2C controllers?
> 
> Thierry

They do not have the neccessary interface to the GPC DMA.