mmc: add MMC_CAP_NONREMOVABLE host capability
eMMC's are not removable, so unsafe resume is OK always.
To permit this a new host capability MMC_CAP_NONREMOVABLE has been added
and suspend / resume updated accordingly.
Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Acked-by: Matt Fleming <matt@console-pimps.org>
Cc: Ian Molton <ian@mnementh.co.uk>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Cc: Denis Karpov <ext-denis.2.karpov@nokia.com>
Cc: Pierre Ossman <pierre@ossman.eu>
Cc: Philip Langdale <philipl@overt.org>
Cc: "Madhusudhan" <madhu.cr@ti.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 2fb9d5f..995db18 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -507,8 +507,6 @@
}
}
-#ifdef CONFIG_MMC_UNSAFE_RESUME
-
/*
* Suspend callback from host.
*/
@@ -551,12 +549,7 @@
}
-#else
-
-#define mmc_suspend NULL
-#define mmc_resume NULL
-
-#endif
+#ifdef CONFIG_MMC_UNSAFE_RESUME
static const struct mmc_bus_ops mmc_ops = {
.remove = mmc_remove,
@@ -565,6 +558,40 @@
.resume = mmc_resume,
};
+static void mmc_attach_bus_ops(struct mmc_host *host)
+{
+ mmc_attach_bus(host, &mmc_ops);
+}
+
+#else
+
+static const struct mmc_bus_ops mmc_ops = {
+ .remove = mmc_remove,
+ .detect = mmc_detect,
+ .suspend = NULL,
+ .resume = NULL,
+};
+
+static const struct mmc_bus_ops mmc_ops_unsafe = {
+ .remove = mmc_remove,
+ .detect = mmc_detect,
+ .suspend = mmc_suspend,
+ .resume = mmc_resume,
+};
+
+static void mmc_attach_bus_ops(struct mmc_host *host)
+{
+ const struct mmc_bus_ops *bus_ops;
+
+ if (host->caps & MMC_CAP_NONREMOVABLE)
+ bus_ops = &mmc_ops_unsafe;
+ else
+ bus_ops = &mmc_ops;
+ mmc_attach_bus(host, bus_ops);
+}
+
+#endif
+
/*
* Starting point for MMC card init.
*/
@@ -575,7 +602,7 @@
BUG_ON(!host);
WARN_ON(!host->claimed);
- mmc_attach_bus(host, &mmc_ops);
+ mmc_attach_bus_ops(host);
/*
* We need to get OCR a different way for SPI.
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 7ad646f..92fa9dc 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -561,8 +561,6 @@
}
}
-#ifdef CONFIG_MMC_UNSAFE_RESUME
-
/*
* Suspend callback from host.
*/
@@ -605,12 +603,7 @@
}
-#else
-
-#define mmc_sd_suspend NULL
-#define mmc_sd_resume NULL
-
-#endif
+#ifdef CONFIG_MMC_UNSAFE_RESUME
static const struct mmc_bus_ops mmc_sd_ops = {
.remove = mmc_sd_remove,
@@ -619,6 +612,40 @@
.resume = mmc_sd_resume,
};
+static void mmc_sd_attach_bus_ops(struct mmc_host *host)
+{
+ mmc_attach_bus(host, &mmc_sd_ops);
+}
+
+#else
+
+static const struct mmc_bus_ops mmc_sd_ops = {
+ .remove = mmc_sd_remove,
+ .detect = mmc_sd_detect,
+ .suspend = NULL,
+ .resume = NULL,
+};
+
+static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
+ .remove = mmc_sd_remove,
+ .detect = mmc_sd_detect,
+ .suspend = mmc_sd_suspend,
+ .resume = mmc_sd_resume,
+};
+
+static void mmc_sd_attach_bus_ops(struct mmc_host *host)
+{
+ const struct mmc_bus_ops *bus_ops;
+
+ if (host->caps & MMC_CAP_NONREMOVABLE)
+ bus_ops = &mmc_sd_ops_unsafe;
+ else
+ bus_ops = &mmc_sd_ops;
+ mmc_attach_bus(host, bus_ops);
+}
+
+#endif
+
/*
* Starting point for SD card init.
*/
@@ -629,7 +656,7 @@
BUG_ON(!host);
WARN_ON(!host->claimed);
- mmc_attach_bus(host, &mmc_sd_ops);
+ mmc_sd_attach_bus_ops(host);
/*
* We need to get OCR a different way for SPI.
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 631a2fe..bb867d2 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -148,6 +148,7 @@
#define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */
#define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */
#define MMC_CAP_DISABLE (1 << 7) /* Can the host be disabled */
+#define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */
/* host specific block data */
unsigned int max_seg_size; /* see blk_queue_max_segment_size */