From 5ce998cf6d1dbb28f14dea879a366ed5348f9681 Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Sat, 17 May 2008 15:57:01 +0800 Subject: [PATCH] Blackfin arch: Check for Anomaly 05000182 IMDMA does not operate to full speed for 600MHz and higher devices Signed-off-by: Michael Hennerich Signed-off-by: Bryan Wu --- arch/blackfin/kernel/bfin_dma_5xx.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c index fd5448d6107c..d54f19085f37 100644 --- a/arch/blackfin/kernel/bfin_dma_5xx.c +++ b/arch/blackfin/kernel/bfin_dma_5xx.c @@ -90,6 +90,17 @@ int request_dma(unsigned int channel, char *device_id) { pr_debug("request_dma() : BEGIN \n"); + +#if defined(CONFIG_BF561) && ANOMALY_05000182 + if (channel >= CH_IMEM_STREAM0_DEST && channel <= CH_IMEM_STREAM1_DEST) { + if (get_cclk() > 500000000) { + printk(KERN_WARNING + "Request IMDMA failed due to ANOMALY 05000182\n"); + return -EFAULT; + } + } +#endif + mutex_lock(&(dma_ch[channel].dmalock)); if ((dma_ch[channel].chan_status == DMA_CHANNEL_REQUESTED)