linux-kernel - Re: [PATCH v2 18/28] soc: fsl: cpm1: qmc: Introduce functions to change timeslots at runtime

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Date:   Tue, 8 Aug 2023 08:10:29 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Herve Codina <herve.codina@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 18/28] soc: fsl: cpm1: qmc: Introduce functions to
 change timeslots at runtime



Le 26/07/2023 à 17:02, Herve Codina a écrit :
> Introduce qmc_chan_{get,set}_ts_info() function to allow timeslots
> modification at runtime.
> 
> The modification is provided using qmc_chan_set_ts_info() and will be
> applied on next qmc_chan_start().
> qmc_chan_set_ts_info() must be called with the channel rx and/or tx
> stopped.
> 
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>

Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>

> ---
>   drivers/soc/fsl/qe/qmc.c | 51 ++++++++++++++++++++++++++++++++++++++++
>   include/soc/fsl/qe/qmc.h | 10 ++++++++
>   2 files changed, 61 insertions(+)
> 
> diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
> index b1883b9d2bae..e3953bc07b1f 100644
> --- a/drivers/soc/fsl/qe/qmc.c
> +++ b/drivers/soc/fsl/qe/qmc.c
> @@ -290,6 +290,57 @@ int qmc_chan_get_info(struct qmc_chan *chan, struct qmc_chan_info *info)
>   }
>   EXPORT_SYMBOL(qmc_chan_get_info);
>   
> +int qmc_chan_get_ts_info(struct qmc_chan *chan, struct qmc_chan_ts_info *ts_info)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chan->ts_lock, flags);
> +
> +	ts_info->rx_ts_mask_avail = chan->rx_ts_mask_avail;
> +	ts_info->tx_ts_mask_avail = chan->tx_ts_mask_avail;
> +	ts_info->rx_ts_mask = chan->rx_ts_mask;
> +	ts_info->tx_ts_mask = chan->tx_ts_mask;
> +
> +	spin_unlock_irqrestore(&chan->ts_lock, flags);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(qmc_chan_get_ts_info);
> +
> +int qmc_chan_set_ts_info(struct qmc_chan *chan, const struct qmc_chan_ts_info *ts_info)
> +{
> +	unsigned long flags;
> +	int ret;
> +
> +	/* Only a subset of available timeslots is allowed */
> +	if ((ts_info->rx_ts_mask & chan->rx_ts_mask_avail) != ts_info->rx_ts_mask)
> +		return -EINVAL;
> +	if ((ts_info->tx_ts_mask & chan->tx_ts_mask_avail) != ts_info->tx_ts_mask)
> +		return -EINVAL;
> +
> +	/* In case of common rx/tx table, rx/tx masks must be identical */
> +	if (chan->qmc->is_tsa_64rxtx) {
> +		if (ts_info->rx_ts_mask != ts_info->tx_ts_mask)
> +			return -EINVAL;
> +	}
> +
> +	spin_lock_irqsave(&chan->ts_lock, flags);
> +
> +	if ((chan->tx_ts_mask != ts_info->tx_ts_mask && !chan->is_tx_stopped) ||
> +	    (chan->rx_ts_mask != ts_info->rx_ts_mask && !chan->is_rx_stopped)) {
> +		dev_err(chan->qmc->dev, "Channel rx and/or tx not stopped\n");
> +		ret = -EBUSY;
> +	} else {
> +		chan->tx_ts_mask = ts_info->tx_ts_mask;
> +		chan->rx_ts_mask = ts_info->rx_ts_mask;
> +		ret = 0;
> +	}
> +	spin_unlock_irqrestore(&chan->ts_lock, flags);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(qmc_chan_set_ts_info);
> +
>   int qmc_chan_set_param(struct qmc_chan *chan, const struct qmc_chan_param *param)
>   {
>   	if (param->mode != chan->mode)
> diff --git a/include/soc/fsl/qe/qmc.h b/include/soc/fsl/qe/qmc.h
> index 6f1d6cebc9fe..802c161636bd 100644
> --- a/include/soc/fsl/qe/qmc.h
> +++ b/include/soc/fsl/qe/qmc.h
> @@ -38,6 +38,16 @@ struct qmc_chan_info {
>   
>   int qmc_chan_get_info(struct qmc_chan *chan, struct qmc_chan_info *info);
>   
> +struct qmc_chan_ts_info {
> +	u64 rx_ts_mask_avail;
> +	u64 tx_ts_mask_avail;
> +	u64 rx_ts_mask;
> +	u64 tx_ts_mask;
> +};
> +
> +int qmc_chan_get_ts_info(struct qmc_chan *chan, struct qmc_chan_ts_info *ts_info);
> +int qmc_chan_set_ts_info(struct qmc_chan *chan, const struct qmc_chan_ts_info *ts_info);
> +
>   struct qmc_chan_param {
>   	enum qmc_mode mode;
>   	union {