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path: root/drivers/mmc/core/core.c
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Diffstat (limited to 'drivers/mmc/core/core.c')
-rw-r--r--drivers/mmc/core/core.c41
1 files changed, 37 insertions, 4 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 01ced4c5a61..3ee5b8c3b5c 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -3,7 +3,7 @@
*
* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
* SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
- * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
+ * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
* MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
@@ -295,6 +295,33 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
EXPORT_SYMBOL(mmc_set_data_timeout);
/**
+ * mmc_align_data_size - pads a transfer size to a more optimal value
+ * @card: the MMC card associated with the data transfer
+ * @sz: original transfer size
+ *
+ * Pads the original data size with a number of extra bytes in
+ * order to avoid controller bugs and/or performance hits
+ * (e.g. some controllers revert to PIO for certain sizes).
+ *
+ * Returns the improved size, which might be unmodified.
+ *
+ * Note that this function is only relevant when issuing a
+ * single scatter gather entry.
+ */
+unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
+{
+ /*
+ * FIXME: We don't have a system for the controller to tell
+ * the core about its problems yet, so for now we just 32-bit
+ * align the size.
+ */
+ sz = ((sz + 3) / 4) * 4;
+
+ return sz;
+}
+EXPORT_SYMBOL(mmc_align_data_size);
+
+/**
* __mmc_claim_host - exclusively claim a host
* @host: mmc host to claim
* @abort: whether or not the operation should be aborted
@@ -638,6 +665,9 @@ void mmc_rescan(struct work_struct *work)
*/
mmc_bus_put(host);
+ if (host->ops->get_cd && host->ops->get_cd(host) == 0)
+ goto out;
+
mmc_claim_host(host);
mmc_power_up(host);
@@ -652,7 +682,7 @@ void mmc_rescan(struct work_struct *work)
if (!err) {
if (mmc_attach_sdio(host, ocr))
mmc_power_off(host);
- return;
+ goto out;
}
/*
@@ -662,7 +692,7 @@ void mmc_rescan(struct work_struct *work)
if (!err) {
if (mmc_attach_sd(host, ocr))
mmc_power_off(host);
- return;
+ goto out;
}
/*
@@ -672,7 +702,7 @@ void mmc_rescan(struct work_struct *work)
if (!err) {
if (mmc_attach_mmc(host, ocr))
mmc_power_off(host);
- return;
+ goto out;
}
mmc_release_host(host);
@@ -683,6 +713,9 @@ void mmc_rescan(struct work_struct *work)
mmc_bus_put(host);
}
+out:
+ if (host->caps & MMC_CAP_NEEDS_POLL)
+ mmc_schedule_delayed_work(&host->detect, HZ);
}
void mmc_start_host(struct mmc_host *host)