linux-kernel - Re: [PATCH 2/2] MMC: MMC/SD/CE-ATA/SDIO driver for Intel Moorestown platform

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Message-ID: <20090510204214.2c0ce736@mjolnir.ossman.eu>
Date:	Sun, 10 May 2009 20:42:14 +0200
From:	Pierre Ossman <pierre@...man.eu>
To:	"Li, Jiebing" <jiebing.li@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Johnson, Charles F" <charles.f.johnson@...el.com>,
	"Zhu, Daniel" <daniel.zhu@...el.com>,
	"Yuan, Hang" <hang.yuan@...el.com>,
	"Pasrija, Geeta" <geeta.pasrija@...el.com>,
	"Li, Jiebing" <jiebing.li@...el.com>
Subject: Re: [PATCH 2/2] MMC: MMC/SD/CE-ATA/SDIO driver for Intel Moorestown
  platform

On Thu, 30 Apr 2009 17:19:06 +0800
"Li, Jiebing" <jiebing.li@...el.com> wrote:

> 
> This patch enables support of SDIO bus driver suspend/resume operation and supply sysfs interface for user
> to call suspend/resume selectively.Remind that this function should work together with SDIO device driver's
> suspend/resume function.
> 

As Matthew asked, what's the use case?

> And Moorestown's specific code is added into this patch to enable the second SDIO slot of the host controller.
> 

Again, stop mixing unrelated things in the same patch.

> @@ -452,3 +828,84 @@ err:
>         return err;
>  }
> 
> +/*
> + * warn device driver and perform a SDIO device reset.
> + * Assume that device driver knows hot to handle resets.
> + */
> +int sdio_reset_device(struct mmc_card *card)
> +{

Use case?

> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index b4cf691..0c9d2eb 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -44,6 +44,14 @@ config MMC_SDHCI_IO_ACCESSORS
>           This is silent Kconfig symbol that is selected by the drivers that
>           need to overwrite SDHCI IO memory accessors.
> 
> +config MMC_SDHCI_MRST_SDIO1
> +       bool
> +       depends on MMC_SDHCI
> +       help
> +         This enables Moorestown SD host controller's 2nd SDIO slot.
> +
> +         If unsure, say N.
> +

Detect this at runtime.

> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index a2804f1..4d4ad6d 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -914,6 +914,17 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
>         if (cmd->data)
>                 flags |= SDHCI_CMD_DATA;
> 
> +#ifdef CONFIG_MMC_SDHCI_MRST_SDIO1
> +       if (host->quirks & SDHCI_QUIRK_MRST_RESTRICTION) {
> +               u16 clk;
> +
> +               clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> +
> +               clk |= SDHCI_CLOCK_CARD_EN;
> +               sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> +       }
> +#endif
> +
>         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
>  }
> 

Huh? Is this some kind of multiplexed nonsense?

> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index fa87b8b..50be698 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -227,6 +227,8 @@ struct sdhci_host {
>  #define SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET           (1<<19)
>  /* Controller has to be forced to use block size of 2048 bytes */
>  #define SDHCI_QUIRK_FORCE_BLK_SZ_2048                  (1<<20)
> +/* Controller of Moorestown specific restriction */
> +#define SDHCI_QUIRK_MRST_RESTRICTION                   (1<<21)
> 

No. Quirks should be defined in a way that allows reuse.

-- 
     -- Pierre Ossman

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