linux-kernel - Re: [PATCH v2 10/14] spi: bcm63xx-hsspi: Add prepend mode support

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Message-ID: <Y9KdX5MFkKFI2ie3@sirena.org.uk>
Date:   Thu, 26 Jan 2023 15:33:51 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Jonas Gorski <jonas.gorski@...il.com>
Cc:     William Zhang <william.zhang@...adcom.com>,
        Linux SPI List <linux-spi@...r.kernel.org>,
        Broadcom Kernel List <bcm-kernel-feedback-list@...adcom.com>,
        tomer.yacoby@...adcom.com, kursad.oney@...adcom.com,
        dregan@...l.com, f.fainelli@...il.com, anand.gore@...adcom.com,
        dan.beygelman@...adcom.com, joel.peshkin@...adcom.com,
        kernel test robot <lkp@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 10/14] spi: bcm63xx-hsspi: Add prepend mode support

On Thu, Jan 26, 2023 at 04:15:00PM +0100, Jonas Gorski wrote:
> On Tue, 24 Jan 2023 at 23:33, William Zhang <william.zhang@...adcom.com> wrote:
> >
> > Due to the controller limitation to keep the chip select low during the
> > bus idle time between the transfer, a dummy cs workaround was used when
> > this driver was first upstreamed to the kernel.  It basically picks the
> > dummy cs as !actual_cs so typically dummy cs is 1 when most of the case

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