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>

diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c
index fd5448d..d54f190 100644 (file)
--- 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)