Re: [PATCH] ARM: mmc: bcm281xx SDHCI driver

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 05/08/2013 11:55 PM, Christian Daudt wrote:
> Add SDHCI driver for the Broadcom 281xx SoCs. Also
> add bindings for it into bcm281xx dts files.
> Still missing:
>  - power managemement

> diff --git a/drivers/mmc/host/sdhci-bcm-kona.c b/drivers/mmc/host/sdhci-bcm-kona.c

> +	/*
> +	 * Back-to-Back register write needs a delay of 1ms at bootup (min 10uS)
> +	 * Back-to-Back writes to same register needs delay when SD bus clock
> +	 * is very low w.r.t AHB clock, mainly during boot-time and during card
> +	 * insert-removal.
> +	 */
> +	udelay(1000);
> +	sdhci_writel(host, val, KONA_SDHOST_CORECTRL);

This sounds very similar to the workaround in
drivers/mmc/host/sdhci-bcm2835.c. Is this the same IP block supported by
that driver? Perhaps not, since bcm2835 apparently needs other WARs such
as always using 32-bit IO and hence needing custom read/write w/b
functions to do read-modify-write which isn't here?
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux