linux-kernel - Re: [PATCH] mmc: at91_mci: fix hanging and rework to match flowcharts

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Date:	Mon, 02 Jul 2007 15:32:00 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Nicolas Ferre <nicolas.ferre@....atmel.com>
CC:	ARM Linux Mailing List <linux-arm-kernel@...ts.arm.linux.org.uk>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Andrew Victor <andrew@...people.com>,
	Andreas Beier <mughat@...il.com>,
	Hamish Guthrie <hamish@...digi.ch>,
	Marc Pignat <marc.pignat@...s.ch>, wux@...dicorp.com,
	Patrice Vilchez <patrice.vilchez@....atmel.com>
Subject: Re: [PATCH] mmc: at91_mci: fix hanging and rework to match flowcharts

Nicolas Ferre wrote:
> Fixes hanging using multi block operations (seen during CMD25).
> Follows closely the datasheet flowcharts.
> 
> This piece of code handles better big file writing. I had to take care
> of the notbusy signal during write (at91_mci_handle_cmdrdy function) and
> to rearrange the AT91_MCI_ENDRX and AT91_MCI_RXBUFF flag usage.
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre@....atmel.com>
> ---

Most of the patch looks ok. Do you want to wait for some more tests or should I
chuck this into the imminent merge window?

> @@ -817,7 +834,11 @@ static int __init at91_mci_probe(struct
>     mmc->ops = &at91_mci_ops;
>     mmc->f_min = 375000;
> -    mmc->f_max = 25000000;
> +    if (cpu_is_at91sam9263())
> +        mmc->f_max = 50000000;
> +    else
> +        mmc->f_max = 25000000;
> +
>     mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
>     mmc->caps = MMC_CAP_BYTEBLOCK | MMC_CAP_MULTIWRITE;
> 

This seems unrelated to the rest of the patch. Also, high-speed won't be enabled
unless you set the appropriate caps (which should be checked against timing
specifications, not just assigned and hope for the best).

> @@ -830,11 +851,11 @@ static int __init at91_mci_probe(struct
>     host->bus_mode = 0;
>     host->board = pdev->dev.platform_data;
>     if (host->board->wire4) {
> -#ifdef SUPPORT_4WIRE
> -        mmc->caps |= MMC_CAP_4_BIT_DATA;
> -#else
> -        printk("AT91 MMC: 4 wire bus mode not supported by this driver
> - using 1 wire\n");
> -#endif
> +        if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
> +            mmc->caps |= MMC_CAP_4_BIT_DATA;
> +        else
> +            printk("AT91 MMC: 4 wire bus mode not supported"
> +                " - using 1 wire\n");
>     }
> 
>     /*
> 

This also looks unrelated.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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