From: Thomas Kopp <thomas.kopp@xxxxxxxxxxxxx> This patch adds a reference to the recent released MCP2517FD and MCP2518FD errata sheets and paste the explanation. The single error correction does not always work, so always indicate that a single error occurred. If the location of the ECC error is outside of the TX-RAM always use netdev_notice() to log the problem. For ECC errors in the TX-RAM, there is a recovery procedure. Signed-off-by: Thomas Kopp <thomas.kopp@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20200925065606.358-1-thomas.kopp@xxxxxxxxxxxxx [mkl: split into two patches, adjust subject and commit message] Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> --- .../net/can/spi/mcp25xxfd/mcp25xxfd-core.c | 21 ++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c b/drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c index bd2ba981ae36..106dda8e5310 100644 --- a/drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c +++ b/drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c @@ -1973,8 +1973,20 @@ mcp25xxfd_handle_eccif(struct mcp25xxfd_priv *priv, bool set_normal_mode) else return err; + /* Errata Reference: + * mcp2517fd: DS80000789B, mcp2518fd: DS80000792C 2. + * + * ECC single error correction does not work in all cases: + * + * Fix/Work Around: + * Enable single error correction and double error detection + * interrupts by setting SECIE and DEDIE. Handle SECIF as a + * detection interrupt and do not rely on the error + * correction. Instead, handle both interrupts as a + * notification that the RAM word at ERRADDR was corrupted. + */ if (ecc_stat & MCP25XXFD_REG_ECCSTAT_SECIF) - msg = "Single ECC Error corrected at address"; + msg = "Single ECC Error detected at address"; else if (ecc_stat & MCP25XXFD_REG_ECCSTAT_DEDIF) msg = "Double ECC Error detected at address"; else @@ -1983,12 +1995,7 @@ mcp25xxfd_handle_eccif(struct mcp25xxfd_priv *priv, bool set_normal_mode) if (!in_tx_ram) { ecc->ecc_stat = 0; - if (ecc_stat & MCP25XXFD_REG_ECCSTAT_SECIF) - netdev_info(priv->ndev, "%s 0x%04x.\n", - msg, addr); - else - netdev_notice(priv->ndev, "%s 0x%04x.\n", - msg, addr); + netdev_notice(priv->ndev, "%s 0x%04x.\n", msg, addr); } else { /* Re-occurring error? */ if (ecc->ecc_stat == ecc_stat) { -- 2.28.0
