linux-kernel - Re: [PATCH v4 1/6] spi: Enable controllers to extend the SPI protocol with MOSI idle configuration

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZnLSL6wvyhGAVyUz@debian-BULLSEYE-live-builder-AMD64>
Date: Wed, 19 Jun 2024 09:42:23 -0300
From: Marcelo Schmitt <marcelo.schmitt1@...il.com>
To: Mark Brown <broonie@...nel.org>
Cc: Marcelo Schmitt <marcelo.schmitt@...log.com>, lars@...afoo.de,
	Michael.Hennerich@...log.com, jic23@...nel.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	nuno.sa@...log.com, dlechner@...libre.com,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/6] spi: Enable controllers to extend the SPI
 protocol with MOSI idle configuration

On 06/19, Mark Brown wrote:
> On Tue, Jun 18, 2024 at 08:10:44PM -0300, Marcelo Schmitt wrote:
> 
> > First replies to v3 brought the idea of having a feature detection mechanism.
> > I didn't really get how to do that. If feature detection is required, can
> > somebody please provide some pointers on how to implement that?
> 
> Look at the checks in spi_setup() for bad_bits.  

Yes, I added MOSI idle configuration bits to bad_bits so spi_setup() fails
if the feature is requested but not supported:

	bad_bits = spi->mode & ~(spi->controller->mode_bits | SPI_CS_WORD |
				 SPI_NO_TX | SPI_NO_RX | SPI_MOSI_IDLE_LOW |
				 SPI_MOSI_IDLE_HIGH);

am I still missing anything?

Thanks,
Marcelo