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authorAmitkumar Karwar <akarwar@marvell.com>2012-11-02 05:44:14 +0400
committerJohn W. Linville <linville@tuxdriver.com>2012-11-14 23:55:37 +0400
commitd31ab3577eca0f74126ceb1d406710e620a155a0 (patch)
tree876368d0dd6f1ad002595a0b2e27e06d8826fa93 /drivers
parentb2cb1a900a104642401faea7bada3c48289402f4 (diff)
downloadlinux-d31ab3577eca0f74126ceb1d406710e620a155a0.tar.xz
mwifiex: add support for SDIO card reset
When command timeout happens due to a bug in firmware/hardware, the timeout handler just prints some debug information. User is unable to reload the driver in this case. Inspired by 9a821f5 "libertas: add sd8686 reset_card support", this patch adds card reset support for SDIO interface when command timeout happens. If the SDIO host contoller supports MMC_POWER_OFF|UP|ON operations, the chip will be reset and the firmware will be re-downloaded. Signed-off-by: Amitkumar Karwar <akarwar@marvell.com> Signed-off-by: Bing Zhao <bzhao@marvell.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wireless/mwifiex/cmdevt.c3
-rw-r--r--drivers/net/wireless/mwifiex/main.h1
-rw-r--r--drivers/net/wireless/mwifiex/sdio.c33
-rw-r--r--drivers/net/wireless/mwifiex/sdio.h1
4 files changed, 38 insertions, 0 deletions
diff --git a/drivers/net/wireless/mwifiex/cmdevt.c b/drivers/net/wireless/mwifiex/cmdevt.c
index da6c49177fcc..c9528b3e9e9a 100644
--- a/drivers/net/wireless/mwifiex/cmdevt.c
+++ b/drivers/net/wireless/mwifiex/cmdevt.c
@@ -944,6 +944,9 @@ mwifiex_cmd_timeout_func(unsigned long function_context)
}
if (adapter->hw_status == MWIFIEX_HW_STATUS_INITIALIZING)
mwifiex_init_fw_complete(adapter);
+
+ if (adapter->if_ops.card_reset)
+ adapter->if_ops.card_reset(adapter);
}
/*
diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h
index 81f8772dcb07..68f36462966b 100644
--- a/drivers/net/wireless/mwifiex/main.h
+++ b/drivers/net/wireless/mwifiex/main.h
@@ -600,6 +600,7 @@ struct mwifiex_if_ops {
int (*event_complete) (struct mwifiex_adapter *, struct sk_buff *);
int (*data_complete) (struct mwifiex_adapter *, struct sk_buff *);
int (*dnld_fw) (struct mwifiex_adapter *, struct mwifiex_fw_image *);
+ void (*card_reset) (struct mwifiex_adapter *);
};
struct mwifiex_adapter {
diff --git a/drivers/net/wireless/mwifiex/sdio.c b/drivers/net/wireless/mwifiex/sdio.c
index fc8a9bfa1248..0d67333daa20 100644
--- a/drivers/net/wireless/mwifiex/sdio.c
+++ b/drivers/net/wireless/mwifiex/sdio.c
@@ -1748,6 +1748,37 @@ mwifiex_update_mp_end_port(struct mwifiex_adapter *adapter, u16 port)
port, card->mp_data_port_mask);
}
+static struct mmc_host *reset_host;
+static void sdio_card_reset_worker(struct work_struct *work)
+{
+ /* The actual reset operation must be run outside of driver thread.
+ * This is because mmc_remove_host() will cause the device to be
+ * instantly destroyed, and the driver then needs to end its thread,
+ * leading to a deadlock.
+ *
+ * We run it in a totally independent workqueue.
+ */
+
+ pr_err("Resetting card...\n");
+ mmc_remove_host(reset_host);
+ /* 20ms delay is based on experiment with sdhci controller */
+ mdelay(20);
+ mmc_add_host(reset_host);
+}
+static DECLARE_WORK(card_reset_work, sdio_card_reset_worker);
+
+/* This function resets the card */
+static void mwifiex_sdio_card_reset(struct mwifiex_adapter *adapter)
+{
+ struct sdio_mmc_card *card = adapter->card;
+
+ if (work_pending(&card_reset_work))
+ return;
+
+ reset_host = card->func->card->host;
+ schedule_work(&card_reset_work);
+}
+
static struct mwifiex_if_ops sdio_ops = {
.init_if = mwifiex_init_sdio,
.cleanup_if = mwifiex_cleanup_sdio,
@@ -1766,6 +1797,7 @@ static struct mwifiex_if_ops sdio_ops = {
.cleanup_mpa_buf = mwifiex_cleanup_mpa_buf,
.cmdrsp_complete = mwifiex_sdio_cmdrsp_complete,
.event_complete = mwifiex_sdio_event_complete,
+ .card_reset = mwifiex_sdio_card_reset,
};
/*
@@ -1803,6 +1835,7 @@ mwifiex_sdio_cleanup_module(void)
/* Set the flag as user is removing this module. */
user_rmmod = 1;
+ cancel_work_sync(&card_reset_work);
sdio_unregister_driver(&mwifiex_sdio);
}
diff --git a/drivers/net/wireless/mwifiex/sdio.h b/drivers/net/wireless/mwifiex/sdio.h
index 21033738ef0c..8cc5468654b4 100644
--- a/drivers/net/wireless/mwifiex/sdio.h
+++ b/drivers/net/wireless/mwifiex/sdio.h
@@ -25,6 +25,7 @@
#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
#include "main.h"