linux-kernel - Re: [PATCH v5] MMC: Add JZ4740 mmc driver

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Message-ID: <4C3BA927.3040307@metafoo.de>
Date:	Tue, 13 Jul 2010 01:45:43 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Joe Perches <joe@...ches.com>
CC:	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Fleming <matt@...sole-pimps.org>,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH v5] MMC: Add JZ4740 mmc driver

Hi

Joe Perches wrote:
> On Tue, 2010-07-13 at 00:20 +0200, Lars-Peter Clausen wrote:
>> This patch adds support for the mmc controller on JZ4740 SoCs.
>> +static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
>> +	struct mmc_data *data)
>> +{
>> +	struct sg_mapping_iter *miter = &host->miter;
>> +	uint32_t *buf;
>> +	bool timeout;
>> +	size_t i, j;
>> +
>> +	while (sg_miter_next(miter)) {
>> +		buf = miter->addr;
>> +		i = miter->length / 4;
>> +		j = i / 8;
>> +		i = i & 0x7;
>> +		while (j) {
>> +			timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
>> +			if (unlikely(timeout))
>> +				goto poll_timeout;
>> +
>> +			writel(buf[0], host->base + JZ_REG_MMC_TXFIFO);
> 
> Perhaps it'd be better to use a temporary for
> host->base + JZ_REG_MMC_TXFIFO
Hm, indeed host->addr is reloaded before each write.
> 
>> +			writel(buf[1], host->base + JZ_REG_MMC_TXFIFO);
>> +			writel(buf[2], host->base + JZ_REG_MMC_TXFIFO);
>> +			writel(buf[3], host->base + JZ_REG_MMC_TXFIFO);
>> +			writel(buf[4], host->base + JZ_REG_MMC_TXFIFO);
>> +			writel(buf[5], host->base + JZ_REG_MMC_TXFIFO);
>> +			writel(buf[6], host->base + JZ_REG_MMC_TXFIFO);
>> +			writel(buf[7], host->base + JZ_REG_MMC_TXFIFO);
>> +			buf += 8;
>> +			--j;
>> +		}
>> +		if (unlikely(i)) {
>> +			timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
>> +			if (unlikely(timeout))
>> +				goto poll_timeout;
>> +
>> +			while (i) {
>> +				writel(*buf, host->base + JZ_REG_MMC_TXFIFO);
>> +				++buf;
>> +				--i;
>> +			}
>> +		}
>> +		data->bytes_xfered += miter->length;
>> +	}
>  
> 

Thanks for reviewing
- Lars

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