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[15/20] OMAP: McBSP: Let element DMA mode hit retention also

Message ID 1248958183-15015-16-git-send-email-eduardo.valentin@nokia.com (mailing list archive)
State Awaiting Upstream, archived
Headers show

Commit Message

Eduardo Valentin July 30, 2009, 12:49 p.m. UTC 
From: Eero Nurkkala <ext-eero.nurkkala@nokia.com>

The device no longer hits retention if element DMA
mode is taken for at least the duration of the
serial console timeout. Force element DMA mode to
shut down through smartidle.

Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@nokia.com>
Acked-by: Eduardo Valentin <eduardo.valentin@nokia.com>
---
 arch/arm/plat-omap/mcbsp.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
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Patch

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 3c6b98e..13f79c6 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -449,6 +449,15 @@  void omap_mcbsp_free(unsigned int id)
 
 		syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
 		syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03) | CLOCKACTIVITY(0x03));
+		/*
+		 * HW bug workaround - If no_idle mode is taken, we need to
+		 * go to smart_idle before going to always_idle, or the
+		 * device will not hit retention anymore.
+		 */
+		syscon |= SIDLEMODE(0x02);
+		OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
+
+		syscon &= ~(SIDLEMODE(0x03));
 		OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
 
 		OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, 0);