Blackfin arch: Check for Anomaly 05000182

IMDMA does not operate to full speed for 600MHz and higher devices

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c
index fd5448d6107..d54f19085f3 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)