Commit 865bddfb authored Oct 20, 2009 by Michael Hennerich Committed by Mike Frysinger Nov 25, 2009

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 <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

parent a8a8a669

arch/blackfin/kernel/bfin_dma_5xx.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -225,9 +225,14 @@ int blackfin_dma_suspend(void)
		void blackfin_dma_resume(void)
		{
		int i;
		for (i = 0; i < MAX_DMA_SUSPEND_CHANNELS; ++i)

		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

		/**