linux-kernel - Re: [RFC PATCH] mmc: add Toshiba PCI SD controller driver

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Date:	Wed, 15 Jan 2014 00:08:32 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Ondrej Zary <linux@...nbow-software.org>
Cc:	linux-mmc@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] mmc: add Toshiba PCI SD controller driver


> +	pr_debug("Command IRQ complete %d %d %x\n", cmd->opcode, cmd->error,
> +	    cmd->flags);

dev_dbg... (and a few other places)


> +/* Set MMC clock / power.
> + * Note: This controller uses a simple divider scheme therefore it cannot run
> + * SD/MMC cards at full speed (24/20MHz). HCLK (=33MHz PCI clock?) is too high
> + * and the next slowest is 16MHz (div=2).
> + */
> +static void toshsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)

This has some very long delays with interrupts off from the
spin_lock_irqsave. I guess thats hardly #1 priority though nor a killer.


> +	/* reset */
> +	toshsd_writew(host, SD_SOFTWARERESET, 0); /* assert */
> +	mdelay(2);
> +	toshsd_writew(host, SD_SOFTWARERESET, 1); /* deassert */
> +	mdelay(2);

This doesn't do quite what you might think - if the device is mmio mapped
then the write can be posted so the mdelay(2) may not be 2mS. I guess if
the old driver didn't do it then it was already plenty long enough...


> +	base = pci_resource_start(pdev, 0);
> +	dev_info(&pdev->dev, "MMIO %pa, IRQ %d\n", &base, pdev->irq);

dbg

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