From: Michael Hennerich Date: Tue, 20 Oct 2009 13:38:04 +0000 (+0000) Subject: Blackfin: fix suspend/resume failure with some on-chip ROMs X-Git-Tag: v2.6.32~33^2~7 X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=commitdiff_plain;h=865bddfbf70d9ba04638c15ef49f17b599d9bbf3 Blackfin: fix suspend/resume failure with some on-chip ROMs Some Blackfin on-chip ROMs utilize some MDMA channels during the suspend and resume process, but don't clean up after themselves. So manually clear all DMA channels when resuming since no DMA could have been running at this point in time. Now Linux should be able to work regardless of any laziness on the part of the on-chip ROM or boot loader. Signed-off-by: Michael Hennerich Signed-off-by: Mike Frysinger --- diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c index 1f17021..3946aff 100644 --- a/arch/blackfin/kernel/bfin_dma_5xx.c +++ b/arch/blackfin/kernel/bfin_dma_5xx.c @@ -225,8 +225,13 @@ int blackfin_dma_suspend(void) void blackfin_dma_resume(void) { int i; - for (i = 0; i < MAX_DMA_SUSPEND_CHANNELS; ++i) - dma_ch[i].regs->peripheral_map = dma_ch[i].saved_peripheral_map; + + for (i = 0; i < MAX_DMA_CHANNELS; ++i) { + dma_ch[i].regs->cfg = 0; + + if (i < MAX_DMA_SUSPEND_CHANNELS) + dma_ch[i].regs->peripheral_map = dma_ch[i].saved_peripheral_map; + } } #endif