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authorDaniel Drake <dsd@laptop.org>2011-06-07 18:15:57 +0100
committerJohn W. Linville <linville@tuxdriver.com>2011-06-10 14:57:47 -0400
commit9a821f5d0fc36425e95f0f4ade4bbca8f0ebff4d (patch)
treecc87d063af26affab99a46595d10961daeab12f7 /drivers/net/wireless/libertas
parent43a1c2721acd792aea370ee68ef054e18c944373 (diff)
libertas: add sd8686 reset_card support
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>
Diffstat (limited to 'drivers/net/wireless/libertas')
-rw-r--r--drivers/net/wireless/libertas/if_sdio.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
index 224e9853c48..387786e1b39 100644
--- a/drivers/net/wireless/libertas/if_sdio.c
+++ b/drivers/net/wireless/libertas/if_sdio.c
@@ -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);