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bh=DFuMg5iWYPLms98ctieeK6in5Im02OMPaCPSyPba7ZA=; b=GvA8Plv/Bm3qf4rmSFr6vepw/my5SAJ/b5OZcdpTNyQ5WtxbZGfpVqYc4r8CSJxWfL8k5f RKGyE+I8KnfqHvD8fkRjM+mtMmYKAIDZrcfAKae1cK6YUfIILV5Oj9+OoRE+HFJAdRZIJy LQ3MUvhqqbjcEYBtIEZSdG9CSvWOEa2o4rtQWRofenQr2CtCiq7O28ZBHDIJzrvh68EgUo DHzX+IMxfqsC+IbdjjHRcZhTqOCDaRTWx1oe0cTIa/09q+knQFqcuW6XjE3+T5r4Si0ixA yt4neKDUnm7bOlriSUQvUZDjSV+ex9znq3S+tGSCwLOiO4ES4LBj7Z+mGrVbTA== From: Miquel Raynal To: Mark Brown Cc: Santhosh Kumar K , richard@nod.at, vigneshr@ti.com, tudor.ambarus@linaro.org, pratyush@kernel.org, mwalle@kernel.org, p-mantena@ti.com, linux-spi@vger.kernel.org, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, a-dutta@ti.com, u-kumar1@ti.com, praneeth@ti.com Subject: Re: [RFC PATCH 01/10] spi: spi-mem: Introduce support for tuning controller In-Reply-To: <2f051eae-61c7-4bff-9f85-cf37b02a7ea3@sirena.org.uk> (Mark Brown's message of "Thu, 14 Aug 2025 13:34:38 +0100") References: <20250811193219.731851-1-s-k6@ti.com> <20250811193219.731851-2-s-k6@ti.com> <6c35baad-a332-4b0a-96ca-1cdb3840ad94@sirena.org.uk> <20487e7f-33dd-4b65-b1a8-5bb8a06ef859@ti.com> <2f051eae-61c7-4bff-9f85-cf37b02a7ea3@sirena.org.uk> User-Agent: mu4e 1.12.7; emacs 30.1 Date: Wed, 10 Sep 2025 10:07:50 +0200 Message-ID: <87y0qmenmx.fsf@bootlin.com> Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Last-TLS-Session-Version: TLSv1.3 On 14/08/2025 at 13:34:38 +01, Mark Brown wrote: > On Thu, Aug 14, 2025 at 05:04:33PM +0530, Santhosh Kumar K wrote: >> On 14/08/25 01:56, Mark Brown wrote: > >> > Should we have something that blocks these tuning required modes witho= ut >> > the appropriate tuning, and/or allows discovery of which modes require >> > this tuning? This all feels very landmineish - client drivers just ha= ve >> > to know when tuning is required. > >> The flash's maximum operating frequency determines whether PHY tuning is >> required, as we need tuning in case of Cadence controller for frequencies >> over 50 MHz. > > That's entirely specific to the Candence controller from the sounds of > it, that makes it hard to write a client driver if you need to know > exactly what the controller you're dealing with is and what it's > requirements are. > >> And we do check for this condition - see Patch 07/10, >> cqspi_phy_op_eligible_sdr(), which currently verifies the flash frequency >> against 166 MHz. This logic can be improved by implementing both min and= max >> frequency checks, will update in the following version. > > I can't actually tell how that verifies if the tuning has been done > appropriately TBH, at least not without more effort than I'd care to > (and the tuning only gets added in patch 10?). Santhosh, do you need more inputs? Or can you send an updated version? I am still thinking about the interface on the spi-mem/spi-nand side, but please iterate so we can move forward. Thanks, Miqu=C3=A8l