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(-)
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c index c6df47d..a4af1fa 100644 --- a/arch/arm/plat-omap/mcbsp.c +++ b/arch/arm/plat-omap/mcbsp.c @@ -343,6 +343,15 @@ static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp)
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);