linux-kernel - Re: [PATCH v5 4/4] mmc: host: sdhci: Add a variable to defer to complete data requests if needed

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Message-ID: <0c70b5cf-4453-b21b-5622-f97ff069cf1b@intel.com>
Date:   Fri, 8 Nov 2019 13:23:40 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>, asutoshd@...eaurora.org,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        baolin.wang7@...il.com, linux-mmc <linux-mmc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 4/4] mmc: host: sdhci: Add a variable to defer to
 complete data requests if needed

On 8/11/19 1:08 PM, Baolin Wang wrote:
> On 06/11/2019, Baolin Wang <baolin.wang@...aro.org> wrote:
>> On Wed, 6 Nov 2019 at 20:02, Adrian Hunter <adrian.hunter@...el.com> wrote:
>>>
>>> To move ahead in the meantime without a new host API, just defer always
> 
> Before new version, I want to make things clear in case I
> misunderstood your points, so you mean I should set always_defer_done
> = true for our Spreadtrum host driver in this patch? Or just like
> below patch? Thanks.
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 850241f..4bef066 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -3035,7 +3035,7 @@ static inline bool sdhci_defer_done(struct
> sdhci_host *host,
>  {
>         struct mmc_data *data = mrq->data;
> 
> -       return host->pending_reset ||
> +       return host->pending_reset || host->always_defer_done ||
>                ((host->flags & SDHCI_REQ_USE_DMA) && data &&
>                 data->host_cookie == COOKIE_MAPPED);
>  }
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index d89cdb9..a73ce89 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -533,6 +533,7 @@ struct sdhci_host {
>         bool pending_reset;     /* Cmd/data reset is pending */
>         bool irq_wake_enabled;  /* IRQ wakeup is enabled */
>         bool v4_mode;           /* Host Version 4 Enable */
> +       bool always_defer_done; /* Always defer to complete requests */
> 
>         struct mmc_request *mrqs_done[SDHCI_MAX_MRQS];  /* Requests done */
>         struct mmc_command *cmd;        /* Current command */
> 

Yes