Subject: Re: [PATCH 2/2 v2] eSDHC: Fix errors when booting kernel with fsl esdhc

From: Anton Vorontsov <[email-masked]>
Date: Fri, 22 Jul 2011 14:15:12 +0400

On Fri, Jul 22, 2011 at 06:15:17PM +0800, Roy Zang wrote:
[...]
>  	if (host->version >= SDHCI_SPEC_200) {
> -		ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> -		ctrl &= ~SDHCI_CTRL_DMA_MASK;
> -		if ((host->flags & SDHCI_REQ_USE_DMA) &&
> -			(host->flags & SDHCI_USE_ADMA))
> -			ctrl |= SDHCI_CTRL_ADMA32;
> -		else
> -			ctrl |= SDHCI_CTRL_SDMA;
> -		sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> +		if (host->quirks & SDHCI_QUIRK_QORIQ_PROCTL_WEIRD) {
> +#define ESDHCI_PROCTL_DMAS_MASK		0x00000300
> +#define ESDHCI_PROCTL_ADMA32		0x00000200
> +#define ESDHCI_PROCTL_SDMA		0x00000000
> +			ctrl = sdhci_readl(host, SDHCI_HOST_CONTROL);
> +			ctrl &= ~ESDHCI_PROCTL_DMAS_MASK;
> +			if ((host->flags & SDHCI_REQ_USE_DMA) &&
> +				(host->flags & SDHCI_USE_ADMA))
> +				ctrl |= ESDHCI_PROCTL_ADMA32;
> +			else
> +				ctrl |= ESDHCI_PROCTL_SDMA;
> +			sdhci_writel(host, ctrl, SDHCI_HOST_CONTROL);
> +		} else {
> +			ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> +			ctrl &= ~SDHCI_CTRL_DMA_MASK;
> +			if ((host->flags & SDHCI_REQ_USE_DMA) &&
> +				(host->flags & SDHCI_USE_ADMA))
> +				ctrl |= SDHCI_CTRL_ADMA32;
> +			else
> +				ctrl |= SDHCI_CTRL_SDMA;
> +			sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);

We try to not pollute generic sdhci.c driver with chip-specific
quirks.

Maybe you can do the fixups via IO accessors? Or by introducing
some additional sdhci op?

[...]
>  	if (power != (unsigned short)-1) {
>  		switch (1 << power) {
> +#define	ESDHCI_FSL_POWER_MASK	0x40
> +#define	ESDHCI_FSL_POWER_180	0x00
> +#define	ESDHCI_FSL_POWER_300	0x40

Same here. The driver will rot quickly if everyone would start
putting chip-specific quirks into sdhci.c. Please don't.

Thanks,

-- 
Anton Vorontsov
Email: [email-masked]