OMAP2+: hwmod: allow board files to prevent devices from being reset upon init

Some boards can't tolerate IP blocks being reset when they are initialized.
Michael Büsch cites a case with the Nokia N810:

    http://www.spinics.net/lists/linux-omap/msg47277.html

To allow such boards to continue working normally, allow board file
maintainers to mark IP blocks to prevent them from being reset upon
init.  This is done via a hwmod function, omap_hwmod_no_setup_reset().

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Michael Buesch <mb@bu3sch.de>

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index e282e35769fd..816aeb97ba28 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -2218,3 +2218,29 @@ u32 omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
 
 	return ret;
 }
+
+/**
+ * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
+ * @oh: struct omap_hwmod *
+ *
+ * Prevent the hwmod @oh from being reset during the setup process.
+ * Intended for use by board-*.c files on boards with devices that
+ * cannot tolerate being reset.  Must be called before the hwmod has
+ * been set up.  Returns 0 upon success or negative error code upon
+ * failure.
+ */
+int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
+{
+	if (!oh)
+		return -EINVAL;
+
+	if (oh->_state != _HWMOD_STATE_REGISTERED) {
+		pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
+			oh->name);
+		return -EINVAL;
+	}
+
+	oh->flags |= HWMOD_INIT_NO_RESET;
+
+	return 0;
+}