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libertas: add sd8686 reset_card support

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At http://dev.laptop.org/ticket/10748 we are seeing a case of the
libertas firmware randomly stopping responding to commands after
resume. Careful monitoring of communications indicates a firmware or
hardware bug, which has been reported to Marvell.

Work around this issue by adding a reset_card method; this is
automatically called when command timeouts are detected and provides an
instant recovery to this situation.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Daniel Drake 2011-06-07 18:15:57 +01:00 committed by John W. Linville
parent 43a1c2721a
commit 9a821f5d0f
1 changed files with 34 additions and 0 deletions
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34
drivers/net/wireless/libertas/if_sdio.c
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@ -892,6 +892,37 @@ static int if_sdio_reset_deep_sleep_wakeup(struct lbs_private *priv)
}
static struct mmc_host *reset_host;
static void if_sdio_reset_card_worker(struct work_struct *work)
{
/*
* The actual reset operation must be run outside of lbs_thread. This
* is because mmc_remove_host() will cause the device to be instantly
* destroyed, and the libertas driver then needs to end lbs_thread,
* leading to a deadlock.
*
* We run it in a workqueue totally independent from the if_sdio_card
* instance for that reason.
*/
pr_info("Resetting card...");
mmc_remove_host(reset_host);
mmc_add_host(reset_host);
}
static DECLARE_WORK(card_reset_work, if_sdio_reset_card_worker);
static void if_sdio_reset_card(struct lbs_private *priv)
{
struct if_sdio_card *card = priv->card;
if (work_pending(&card_reset_work))
return;
reset_host = card->func->card->host;
schedule_work(&card_reset_work);
}
/*******************************************************************/
/* SDIO callbacks */
/*******************************************************************/
@ -1065,6 +1096,7 @@ static int if_sdio_probe(struct sdio_func *func,
priv->enter_deep_sleep = if_sdio_enter_deep_sleep;
priv->exit_deep_sleep = if_sdio_exit_deep_sleep;
priv->reset_deep_sleep_wakeup = if_sdio_reset_deep_sleep_wakeup;
priv->reset_card = if_sdio_reset_card;
sdio_claim_host(func);
@ -1301,6 +1333,8 @@ static void __exit if_sdio_exit_module(void)
/* Set the flag as user is removing this module. */
user_rmmod = 1;
cancel_work_sync(&card_reset_work);
sdio_unregister_driver(&if_sdio_driver);
lbs_deb_leave(LBS_DEB_SDIO);