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

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Message-ID: <20240518124404.472eb60b@xps-13>
Date: Sat, 18 May 2024 12:44:19 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Val Packett <val@...kett.cool>
Cc: Richard Weinberger <richard@....at>, Vignesh Raghavendra
 <vigneshr@...com>, Heiko Stuebner <heiko@...ech.de>, Stephen Rothwell
 <sfr@...b.auug.org.au>, linux-mtd@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: rawnand: rockchip: reject NVDDR timings when
 checked

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

> Signed-off-by: Val Packett <val@...kett.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