From 72cc6d715d5b018e2cff4adb68966855850d4e77 Mon Sep 17 00:00:00 2001 From: Eero Nurkkala Date: Thu, 20 Aug 2009 16:18:20 +0300 Subject: [PATCH] OMAP: McBSP: Let element DMA mode hit retention also 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 Acked-by: Eduardo Valentin Acked-by: Tony Lindgren Signed-off-by: Mark Brown --- arch/arm/plat-omap/mcbsp.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c index 56a5688..b63a720 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); -- 2.7.4