linux-kernel - Re: [RFC PATCH v2 12/12] spi: cadence-quadspi: enable PHY for direct reads and writes

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Message-ID: <87tsvvf58k.fsf@bootlin.com>
Date: Thu, 05 Feb 2026 18:51:55 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Santhosh Kumar K <s-k6@...com>
Cc: <broonie@...nel.org>,  <robh@...nel.org>,  <krzk+dt@...nel.org>,
  <conor+dt@...nel.org>,  <richard@....at>,  <vigneshr@...com>,
  <tudor.ambarus@...aro.org>,  <pratyush@...nel.org>,  <mwalle@...nel.org>,
  <linux-spi@...r.kernel.org>,  <devicetree@...r.kernel.org>,
  <linux-kernel@...r.kernel.org>,  <linux-mtd@...ts.infradead.org>,
  <praneeth@...com>,  <u-kumar1@...com>,  <p-mantena@...com>,
  <a-dutta@...com>
Subject: Re: [RFC PATCH v2 12/12] spi: cadence-quadspi: enable PHY for
 direct reads and writes

On 13/01/2026 at 19:46:17 +0530, Santhosh Kumar K <s-k6@...com> wrote:

> Enable PHY mode for direct memory-mapped reads and large indirect writes
> (>= 1KB) to leverage calibrated RX/TX timing delays for high-frequency
> operations.

Is enabling the calibration so impacting? Did you measure it? Isn't
skipping any non read or non write operations enough? Status reads for
example should have a smaller op->max_freq based on my previous comment,
so in theory I do not see when we will meet these cases.

Fine for the other conditions.

Miquèl