linux-kernel - RE: [PATCH v2 2/3] mtd: rawnand: cadence: use dma_map

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Message-ID: <BL3PR11MB653280E16A4399DDBB300CA8A2EE2@BL3PR11MB6532.namprd11.prod.outlook.com>
Date: Wed, 29 Jan 2025 09:02:58 +0000
From: "Rabara, Niravkumar L" <niravkumar.l.rabara@...el.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>
CC: Richard Weinberger <richard@....at>, Vignesh Raghavendra
	<vigneshr@...com>, "linux@...blig.org" <linux@...blig.org>, Shen Lichuan
	<shenlichuan@...o.com>, Jinjie Ruan <ruanjinjie@...wei.com>,
	"u.kleine-koenig@...libre.com" <u.kleine-koenig@...libre.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH v2 2/3] mtd: rawnand: cadence: use dma_map_resource for
 sdma address

Hi Miquel,

> -----Original Message-----
> From: Miquel Raynal <miquel.raynal@...tlin.com>
> Sent: Tuesday, 21 January, 2025 5:53 PM
> To: Rabara, Niravkumar L <niravkumar.l.rabara@...el.com>
> Cc: Richard Weinberger <richard@....at>; Vignesh Raghavendra
> <vigneshr@...com>; linux@...blig.org; Shen Lichuan
> <shenlichuan@...o.com>; Jinjie Ruan <ruanjinjie@...wei.com>; u.kleine-
> koenig@...libre.com; linux-mtd@...ts.infradead.org; linux-
> kernel@...r.kernel.org; stable@...r.kernel.org
> Subject: Re: [PATCH v2 2/3] mtd: rawnand: cadence: use dma_map_resource
> for sdma address
> 
> Hello,
> 
> On 16/01/2025 at 11:21:53 +08, niravkumar.l.rabara@...el.com wrote:
> 
> > From: Niravkumar L Rabara <niravkumar.l.rabara@...el.com>
> >
> > Map the slave DMA I/O address using dma_map_resource.
> > When ARM SMMU is enabled, using a direct physical address of SDMA
> > results in DMA transaction failure.
> 
> It is in general a better practice anyway. Drivers should be portable and
> always remap resources.
> 

Do you think the commit message below would be better, or 
stick with the existing one?

Remap the slave DMA I/O resources to enhance driver portability.
Using a physical address causes DMA translation failure when the
ARM SMMU is enabled.

Thanks,
Nirav