linux-kernel - Re: [PATCH v3 4/6] mmc: uniphier-sd: add UniPhier SD/eMMC controller driver

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Date:   Thu, 23 Aug 2018 12:43:40 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 4/6] mmc: uniphier-sd: add UniPhier SD/eMMC controller driver

[...]

> +static void uniphier_sd_external_dma_request(struct tmio_mmc_host *host,
> +                                            struct tmio_mmc_data *pdata)
> +{
> +       struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
> +       struct dma_chan *chan;
> +
> +       chan = dma_request_chan(mmc_dev(host->mmc), "rx-tx");
> +       if (IS_ERR(chan)) {
> +               dev_warn(mmc_dev(host->mmc),
> +                        "failed to request DMA channel. falling back to PIO\n");
> +               return; /* just use PIO even for -EPROBE_DEFER */
> +       }
> +
> +       /* this driver uses a single channel for both RX an TX */
> +       priv->chan = chan;
> +       host->chan_rx = chan;
> +       host->chan_tx = chan;
> +
> +       tasklet_init(&host->dma_issue, uniphier_sd_external_dma_issue,
> +                    (unsigned long)host);

Isn't it time to get rid of tasklets for tmio?

No worries, I don't require that to be changed prior $subject patch,
however using threaded IRQs is a justified modernization for the tmio
variants.

[...]

Kind regards
Uffe