linux-kernel - Re: [PATCH 1/2] platform/chrome: cros_ec

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Message-ID: <03518a00-c30c-a3ba-d26e-10bae4060640@collabora.com>
Date:   Fri, 4 Dec 2020 10:15:08 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Stephen Boyd <swboyd@...omium.org>,
        Benson Leung <bleung@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Simon Glass <sjg@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Alexandru M Stan <amstan@...omium.org>
Subject: Re: [PATCH 1/2] platform/chrome: cros_ec_spi: Don't overwrite
 spi::mode

Hi Stephen,

Thank you for your patch.

On 3/12/20 2:16, Stephen Boyd wrote:
> There isn't any need to overwrite the mode here in the driver with what
> has been detected by the firmware, such as DT or ACPI. In fact, if we
> use the SPI CS gpio descriptor feature we will overwrite the mode with
> SPI_MODE_0 where it already contains SPI_MODE_0 and more importantly
> SPI_CS_HIGH. Clearing the SPI_CS_HIGH bit causes the CS line to toggle
> when the device is probed when it shouldn't change, confusing the driver
> and making it fail to probe. Drop the assignment and let the spi core
> take care of it.
> 
> Fixes: a17d94f0b6e1 ("mfd: Add ChromeOS EC SPI driver")
> Cc: Simon Glass <sjg@...omium.org>
> Cc: Gwendal Grignou <gwendal@...omium.org>
> Cc: Douglas Anderson <dianders@...omium.org>
> Cc: Alexandru M Stan <amstan@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---

Acked-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>

>  drivers/platform/chrome/cros_ec_spi.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c
> index dfa1f816a45f..f9df218fc2bb 100644
> --- a/drivers/platform/chrome/cros_ec_spi.c
> +++ b/drivers/platform/chrome/cros_ec_spi.c
> @@ -742,7 +742,6 @@ static int cros_ec_spi_probe(struct spi_device *spi)
>  	int err;
>  
>  	spi->bits_per_word = 8;
> -	spi->mode = SPI_MODE_0;
>  	spi->rt = true;
>  	err = spi_setup(spi);
>  	if (err < 0)
>