From: Eero Nurkkala <ext-eero.nurkk...@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.nurkk...@nokia.com>
Acked-by: Eduardo Valentin <eduardo.valen...@nokia.com>
---
arch/arm/plat-omap/mcbsp.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
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);
--
1.6.2.GIT
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