cherry-pick commit 9feae246963c648b212

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>

Conflicts:

	include/linux/mmc/host.h

2 files changed, 68 insertions, 14 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 06084dbf1277..3e35075b7a13 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -507,8 +507,6 @@ static void mmc_detect(struct mmc_host *host)
 	}
 }
 
-#ifdef CONFIG_MMC_UNSAFE_RESUME
-
 /*
  * Suspend callback from host.
  */
@@ -551,20 +549,49 @@ static void mmc_resume(struct mmc_host *host)
 
 }
 
-#else
+#ifdef CONFIG_MMC_UNSAFE_RESUME
 
-#define mmc_suspend NULL
-#define mmc_resume NULL
+static const struct mmc_bus_ops mmc_ops = {
+	.remove = mmc_remove,
+	.detect = mmc_detect,
+	.suspend = mmc_suspend,
+	.resume = mmc_resume,
+};
 
-#endif
+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 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
 	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 48b800baaa3c..9486936f7ed6 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -596,8 +596,6 @@ static void mmc_sd_detect(struct mmc_host *host)
 	}
 }
 
-#ifdef CONFIG_MMC_UNSAFE_RESUME
-
 /*
  * Suspend callback from host.
  */
@@ -659,20 +657,49 @@ static void mmc_sd_resume(struct mmc_host *host)
 
 }
 
-#else
+#ifdef CONFIG_MMC_UNSAFE_RESUME
 
-#define mmc_sd_suspend NULL
-#define mmc_sd_resume NULL
+static const struct mmc_bus_ops mmc_sd_ops = {
+	.remove = mmc_sd_remove,
+	.detect = mmc_sd_detect,
+	.suspend = mmc_sd_suspend,
+	.resume = mmc_sd_resume,
+};
 
-#endif
+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.
  */
@@ -686,7 +713,7 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 	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.