linux-kernel - Re: [PATCH] mmc: Add new via-sdmmc host controller driver

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Message-ID: <20090613134328.0c168205@mjolnir.ossman.eu>
Date:	Sat, 13 Jun 2009 13:43:28 +0200
From:	Pierre Ossman <pierre@...man.eu>
To:	Harald Welte <HaraldWelte@...tech.com>
Cc:	Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	JosephChan@....com.tw, Bruce Chang <BruceChang@....com.tw>
Subject: Re: [PATCH] mmc: Add new via-sdmmc host controller driver

On Fri, 12 Jun 2009 15:59:30 +0800
Harald Welte <HaraldWelte@...tech.com> wrote:

> +
> +#define MMC_STOP_TRANSMISSION	12

This define is no longer used.

> +	/* It seems that our DMA can not work normally with 375kHz clock */
> +	/* FIXME: don't brute-force 8MHz but use PIO at 375kHz !! */
> +	addrbase = host->pcictrl_mmiobase;
> +	if (readb(addrbase + VIA_CRDR_PCISDCCLK) == PCI_CLK_375K) {
> +		dev_info(host->mmc->parent, "forcing card speed to 8MHz\n");
> +		writeb(PCI_CLK_8M, addrbase + VIA_CRDR_PCISDCCLK);
> +	}

This is pretty nasty. Please see if you can provide a workaround some
time soon.

> +	if (ios->power_mode != MMC_POWER_OFF)
> +		via_sdc_set_power(host, ios->vdd);

What if we actually do need to power off?
> +static void __devexit via_sd_remove(struct pci_dev *pcidev)
> +{
> +	struct via_crdr_mmc_host *sdhost;
> +	u8 gatt;
> +
> +	pr_info(DRV_NAME
> +		": VIA SDMMC controller at %s [%04x:%04x] has been removed\n",
> +		pci_name(pcidev), (int)pcidev->vendor, (int)pcidev->device);
> +
> +	sdhost = pci_get_drvdata(pcidev);
> +
> +	tasklet_kill(&sdhost->finish_tasklet);
> +
> +	if (&sdhost->timer)
> +		del_timer_sync(&sdhost->timer);
> +
> +	mmc_remove_host(sdhost->mmc);
> +

You need to do the removal as the first step and you might need to
explicitly kill any ongoing requests.

Rgds
-- 
     -- Pierre Ossman

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