can: m_can: add missing message RAM initialization

[cascardo/linux.git] / drivers / net / can / m_can / m_can.c

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index e61886b..268ad50 100644 (file)
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1010,7 +1010,7 @@ static int m_can_of_parse_mram(struct platform_device *pdev,
        struct resource *res;
        void __iomem *addr;
        u32 out_val[MRAM_CFG_LEN];
-       int ret;
+       int i, start, end, ret;
 
        /* message ram could be shared */
        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
@@ -1061,6 +1061,15 @@ static int m_can_of_parse_mram(struct platform_device *pdev,
                priv->mcfg[MRAM_TXE].off, priv->mcfg[MRAM_TXE].num,
                priv->mcfg[MRAM_TXB].off, priv->mcfg[MRAM_TXB].num);
 
+       /* initialize the entire Message RAM in use to avoid possible
+        * ECC/parity checksum errors when reading an uninitialized buffer
+        */
+       start = priv->mcfg[MRAM_SIDF].off;
+       end = priv->mcfg[MRAM_TXB].off +
+               priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
+       for (i = start; i < end; i += 4)
+               writel(0x0, priv->mram_base + i);
+
        return 0;
 }