linux-kernel - Re: [PATCH] mtd: rawnand: davinci: Reduce polling interval in NAND_OP_WAITRDY

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Message-ID: <9edfc43a-7f2e-4036-9eaa-6666608085b8@bootlin.com>
Date: Thu, 19 Dec 2024 15:55:34 +0100
From: Bastien Curutchet <bastien.curutchet@...tlin.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>,
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>
Cc: linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Herve Codina <herve.codina@...tlin.com>,
 Christopher Cordahi <christophercordahi@...ometrics.ca>
Subject: Re: [PATCH] mtd: rawnand: davinci: Reduce polling interval in
 NAND_OP_WAITRDY_INSTR

Hi all,

On 12/19/24 3:25 PM, Bastien Curutchet wrote:
> For each NAND_OP_WAITRDY_INSTR operation, the NANDFSR register is
> polled only once every 100 us to check for the EMA_WAIT pin. This
> isn't frequent enough and causes delays in NAND accesses.
> 
> Set the polling interval to 0s. It increases the page read speed
> reported by flash_speed by ~40% (~30% on page writes).
> 
> ---
> Signed-off-by: Bastien Curutchet <bastien.curutchet@...tlin.com>

I just realized that this SOB should be above the '---'. Sorry about 
that, I'll send a V2 right away.

Best regards,
Bastien