Re: [PATCH] mtd: rawnand: rockchip: reject NVDDR timings when checked

From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Val Packett <val@packett.cool>
Cc: Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Heiko Stuebner <heiko@sntech.de>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	linux-mtd@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mtd: rawnand: rockchip: reject NVDDR timings when checked
Date: Sat, 18 May 2024 12:44:19 +0200	[thread overview]
Message-ID: <20240518124404.472eb60b@xps-13> (raw)
In-Reply-To: <20240518033923.5577-2-val@packett.cool>

Hi Val,

I might propose a slightly different title which I think better
describes the situation:
"mtd: rawnand: rockchip: ensure NVDDR timings are rejected"

val@packett.cool wrote on Sat, 18 May 2024 00:31:13 -0300:

> .setup_interface first gets called with a negative "target" value

Just as an FYI, the fact that it is negative is an implementation
detail, but you mention the #define of the value below, so that's fine.

> NAND_DATA_IFACE_CHECK_ONLY, in which case an error is expected
> if the controller driver does not support the timing mode (NVDDR).
> 

Here I would welcome two tags in order to get this backported as early
as needed in stable kernels:

Cc: stable@vger.kernel.org
Fixes: a9ecc8c814e9 ("mtd: rawnand: Choose the best timings, NV-DDR included")

> Signed-off-by: Val Packett <val@packett.cool>
> ---
> Hello everyone, first Linux patch from a long time FreeBSD person :)
> 
> This was required to get the NAND controller to attach on the random
> old RK3066 tablet I'm bringing up mainline on.

Welcome! The fix looks right besides minor nits in the commit log. I'll
probably take the v2 when it's out after -rc1 has been tagged.

Thanks,
Miquèl

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