linux-kernel - Re: [LIBERTAS-SDIO] Support for single transfer blocks?

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Date:	Tue, 12 May 2009 23:11:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Luis Galdos <luis.galdos@...i.com>
Cc:	<linux-kernel@...r.kernel.org>, linux-wireless@...r.kernel.org
Subject: Re: [LIBERTAS-SDIO]  Support for single transfer blocks?


Let's Cc the wireless development list.

On Mon, 11 May 2009 16:41:51 +0200 Luis Galdos <luis.galdos@...i.com> wrote:

> Hi all,
> 
> I have one question concerning to the Libertas-driver: Does this driver works with 
> SDIO-hosts that only support single transfer blocks? I ask cause I have seen two problems 
> with a SDIO-port that doesn't support multiple blocks:
> 
> * The firmware installation successes only with a modification of the block size (see 
> below patch)
> 
> * The transfer of Ethernet-frames works only if the "complete" frame is smaller than the 
> block size of the SDIO-host. By larger packages, the SD8686 doesn't generate the expected 
> IRQ (cause it expected a multiple transfer) and the driver detects a timeout.
> 
> Do you know something about this? Thanks in advance,
> 
> 
> PS: Sorry for the possible wrong format of this email (my first one)
> 
> 
> diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
> index b54e2ea..f88a4da 100644
> --- a/drivers/net/wireless/libertas/if_sdio.c
> +++ b/drivers/net/wireless/libertas/if_sdio.c
> @@ -33,6 +33,7 @@
>   #include <linux/mmc/card.h>
>   #include <linux/mmc/sdio_func.h>
>   #include <linux/mmc/sdio_ids.h>
> +#include <linux/mmc/host.h>
> 
>   #include "host.h"
>   #include "decl.h"
> @@ -507,6 +508,8 @@ static int if_sdio_prog_real(struct if_sdio_card *card)
>          u32 chunk_size;
>          const u8 *firmware;
>          size_t size, req_size;
> +       struct mmc_host *host;
> +       int max_blksize = 0;
> 
>          lbs_deb_enter(LBS_DEB_SDIO);
> 
> @@ -524,7 +527,19 @@ static int if_sdio_prog_real(struct if_sdio_card *card)
> 
>          sdio_claim_host(card->func);
> 
> -       ret = sdio_set_block_size(card->func, 32);
> +       /*
> +        * If the host doesn't support multi-blocks, then use the the maximal block
> +        * size for the transfers. Otherwise the firmware installation will fail.
> +        */
> +       host = card->func->card->host;
> +       if (host->max_blk_count == 1) {
> +               lbs_pr_info("Setting block size to %u\n", host->max_blk_size);
> +               max_blksize = card->func->max_blksize;
> +               card->func->max_blksize = host->max_blk_size;
> +               ret = sdio_set_block_size(card->func, host->max_blk_size);
> +       } else
> +               ret = sdio_set_block_size(card->func, 32);
> +
>          if (ret)
>                  goto release;
> 
> @@ -593,6 +608,10 @@ static int if_sdio_prog_real(struct if_sdio_card *card)
> 
>          ret = 0;
> 
> +        /* Restore the original block size if it was changed before */
> +        if (max_blksize)
> +                card->func->max_blksize = max_blksize;
> +
>          lbs_deb_sdio("waiting for firmware to boot...\n");
> 
>          /* wait for the firmware to boot */
> 
> 
> -- 
> Luis Galdos
> --
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