linux-kernel - Re: [PATCH v3 3/9] iio: dac: adi-axi-dac: modify stream enable

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Message-ID: <e8d440af44842507b100fb6c66b7c456175c517b.camel@gmail.com>
Date: Mon, 13 Jan 2025 16:00:37 +0000
From: Nuno Sá <noname.nuno@...il.com>
To: Angelo Dureghello <adureghello@...libre.com>, Lars-Peter Clausen
	 <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron
	 <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, Nuno Sa
	 <nuno.sa@...log.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 linux-iio@...r.kernel.org, 	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/9] iio: dac: adi-axi-dac: modify stream enable

On Fri, 2025-01-10 at 11:24 +0100, Angelo Dureghello wrote:
> From: Angelo Dureghello <adureghello@...libre.com>
> 
> Change suggested from the AXI HDL team, modify the function
> axi_dac_data_stream_enable() to check for interface busy, to avoid
> possible issues when starting the stream.
> 
> Fixes: e61d7178429a ("iio: dac: adi-axi-dac: extend features")
> Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
> ---

LGTM... One minor thing that come to mind is that if it wouldn't be more
intuitive to return -EBUSY in case of a timeout? Anyways:

Reviewed-by: Nuno Sa <nuno.sa@...log.com>

>  drivers/iio/dac/adi-axi-dac.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
> index b143f7ed6847..ac871deb8063 100644
> --- a/drivers/iio/dac/adi-axi-dac.c
> +++ b/drivers/iio/dac/adi-axi-dac.c
> @@ -585,6 +585,14 @@ static int axi_dac_ddr_disable(struct iio_backend *back)
>  static int axi_dac_data_stream_enable(struct iio_backend *back)
>  {
>  	struct axi_dac_state *st = iio_backend_get_priv(back);
> +	int ret, val;
> +
> +	ret = regmap_read_poll_timeout(st->regmap,
> +				AXI_DAC_UI_STATUS_REG, val,
> +				FIELD_GET(AXI_DAC_UI_STATUS_IF_BUSY, val) ==
> 0,
> +				10, 100 * KILO);
> +	if (ret)
> +		return ret;
>  
>  	return regmap_set_bits(st->regmap, AXI_DAC_CUSTOM_CTRL_REG,
>  			       AXI_DAC_CUSTOM_CTRL_STREAM_ENABLE);
>