linux-kernel - Re: [PATCH 5/7] dmaengine: sh: rz-dmac: Add suspend to RAM support

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Message-ID: <7f0305f6-ae2d-4069-b53a-d2a81e75d164@tuxon.dev>
Date: Thu, 5 Feb 2026 15:00:13 +0200
From: Claudiu Beznea <claudiu.beznea@...on.dev>
To: Biju Das <biju.das.jz@...renesas.com>, "vkoul@...nel.org"
 <vkoul@...nel.org>,
 Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
 "lgirdwood@...il.com" <lgirdwood@...il.com>,
 "broonie@...nel.org" <broonie@...nel.org>, "perex@...ex.cz"
 <perex@...ex.cz>, "tiwai@...e.com" <tiwai@...e.com>,
 "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
 "geert+renesas@...der.be" <geert+renesas@...der.be>,
 Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Cc: "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-sound@...r.kernel.org" <linux-sound@...r.kernel.org>,
 "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 5/7] dmaengine: sh: rz-dmac: Add suspend to RAM support

Hi, Biju,

On 1/26/26 17:28, Biju Das wrote:
> Hi All,
> 
>> -----Original Message-----
>> From: Biju Das
>> Sent: 26 January 2026 13:12
>> Subject: RE: [PATCH 5/7] dmaengine: sh: rz-dmac: Add suspend to RAM support
>>

[ ... ]

>>
>> For s2idle issue on RZ/G3L is DMA device is in asserted state, not forwarding any IRQ to cpu for
>> wakeup.
>>
>> For S2RAM issue on RZ/G3L is during suspend hardware turns DMAACLK off/ Asserted state. Clock framwork
>> is not turning On DMAACLK as it critical clk.
>>
>> Can you please check your TF-A for the second case? First case, RZ/G3S may ok for reset assert state,
>> it can forward IRQs to CPU.
> 
> Just to summarize, currently there are 2 differences identified between RZ/G3S and RZ/G3L:
> 
> SoC differences for s2idle:
> 
> RZ/G3S: Can wake the system if the DMA device is in the assert state
> 
> RZ/G3L: Cannot wake the system if the DMA device is in the assert state.
> 
> 
> TF-A differences for s2ram:
> 
> RZ/G3S: TF_A turns on DMA_ACLK during boot/resume.
> 
> RZ/G3L: TF_A does not handle DMA_ACLK during boot/resume.

I'm seeing at [1] you are addressing these differences in the clock/reset 
drivers. With that, are you still considering this patch is breaking your system?

Thank you,
Claudiu

[1] https://lore.kernel.org/all/20260130143456.256813-1-biju.das.jz@bp.renesas.com