[PATCH 12/13] sdhci: Add quirk for controllers with max. block size up to 4096 bytes

[Pierre Ossman]

On Fri, 13 Feb 2009 17:47:39 +0300
Anton Vorontsov <avorontsov at ru.mvista.com> wrote:

> @@ -831,7 +832,12 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
>  	sdhci_set_transfer_irqs(host);
>  
>  	/* We do not handle DMA boundaries, so set it to max (512 KiB) */
> -	sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, data->blksz), SDHCI_BLOCK_SIZE);
> +	if (host->quirks & SDHCI_QUIRK_MAX_BLK_SZ_4096)
> +		blksz = data->blksz;
> +	else
> +		blksz = SDHCI_MAKE_BLKSZ(7, data->blksz);
> +
> +	sdhci_writew(host, blksz, SDHCI_BLOCK_SIZE);
>  	sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
>  }
>  

Hmm.. I seem to have overlooked this part previously. I guess they've
basically stripped out the DMA boundary stuff and used the bits for
other things?

At this point I'm leaning more towards simply not supporting their
extended block size. After all, is it ever used?

Rgds
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