Re: [PATCH] libertas: fix power save issue in libertas_sdio module

[Dan Williams <dcbw@redhat.com>]

On Tue, 2009-02-10 at 20:57 -0800, Bing Zhao wrote:
> Hi,
> 
> This is to fix an issue in IEEE power save mode in libertas_sdio module.
> The patch (below) was generated by git-format-patch command against
> "linux-2.6" git tree.
> 
> Please review and your feedbacks are welcome.
> 
> Thanks,
> 
> Bing
> 
> -----------------------------------------------------------------------
> From 4a925690dc76965bf7173bfc0198112093bf131e Mon Sep 17 00:00:00 2001
> From: Bing Zhao <bzhao@marvell.com>
> Date: Wed, 4 Feb 2009 22:22:39 -0800
> Subject: [PATCH] libertas: fix power save issue in libertas_sdio module
> 
> The problem: "iwconfig ethX power on" returns error
> 
> The cause: "ps_supported" flag was never set for SD8385/8686
> 
> The fix: check firmware capabilities returned by GET_HW_SPEC command.
> Set "ps_supported" to 1 if FW_CAPINFO_PS bit is on. This fix applies
> to SDIO interface only.
> 
> Signed-off-by: Bing Zhao <bzhao@marvell.com>

Good catch, thanks!

Acked-by: Dan Williams <dcbw@redhat.com>

> ---
>  drivers/net/wireless/libertas/defs.h    |    1 +
>  drivers/net/wireless/libertas/if_sdio.c |    6 ++++++
>  2 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/wireless/libertas/defs.h
> b/drivers/net/wireless/libertas/defs.h
> index c364e4c..10a43c5 100644
> --- a/drivers/net/wireless/libertas/defs.h
> +++ b/drivers/net/wireless/libertas/defs.h
> @@ -263,6 +263,7 @@ static inline void lbs_deb_hex(unsigned int grp,
> const char *prompt, u8 *buf, in
>  
>  #define	CMD_F_HOSTCMD		(1 << 0)
>  #define FW_CAPINFO_WPA  	(1 << 0)
> +#define FW_CAPINFO_PS  		(1 << 1)
>  #define FW_CAPINFO_FIRMWARE_UPGRADE	(1 << 13)
>  #define FW_CAPINFO_BOOT2_UPGRADE	(1<<14)
>  #define FW_CAPINFO_PERSISTENT_CONFIG	(1<<15)
> diff --git a/drivers/net/wireless/libertas/if_sdio.c
> b/drivers/net/wireless/libertas/if_sdio.c
> index 4519d73..9878368 100644
> --- a/drivers/net/wireless/libertas/if_sdio.c
> +++ b/drivers/net/wireless/libertas/if_sdio.c
> @@ -209,6 +209,9 @@ static int if_sdio_handle_event(struct if_sdio_card
> *card,
>  		event = sdio_readb(card->func, IF_SDIO_EVENT, &ret);
>  		if (ret)
>  			goto out;
> +
> +		/* right shift 3 bits to get the event id */
> +		event >>= 3;
>  	} else {
>  		if (size < 4) {
>  			lbs_deb_sdio("event packet too small (%d
> bytes)\n",
> @@ -921,6 +924,9 @@ static int if_sdio_probe(struct sdio_func *func,
>  	if (ret)
>  		goto err_activate_card;
>  
> +	if (priv->fwcapinfo & FW_CAPINFO_PS)
> +		priv->ps_supported = 1;
> +
>  out:
>  	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
>