From 7ad7a345a4f17c08a1bb9bfdbb62f7793d84aa36 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Lothar=20Wa=C3=9Fmann?= Date: Thu, 8 Dec 2011 09:15:44 +0100 Subject: [PATCH] dma: mxs-dma: Don't use CLKGATE bits in CTRL0 to disable DMA channels MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This is how the original Freescale code (unintentionally) worked, because the code path which would have asserted the CLKGATE bit was never actually reached in their code. This fixes the nefarious "DMA timout" bug when multiple DMA channels (e.g. GPMI NAND and MMC) are used at the same time. If a better fix for this problem should be found, the clkgate handling could be reinstated. See http://lists.infradead.org/pipermail/linux-arm-kernel/2011-September/065228.html Also reverse the order of mxs_dma_disable_chan() and mxs_dma_reset_chan() in mxs_dma_control() because mxs_dma_reset_chan() can only work when the DMA channel is enabled. Signed-off-by: Lothar Waßmann Signed-off-by: Vinod Koul --- Reading git-format-patch failed