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can: mcp25xxfd: mcp25xxfd_handle_eccif(): add ECC related errata and update log messages 

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@microchip.com>
Link: https://lore.kernel.org/r/20200925065606.358-1-thomas.kopp@microchip.com
[mkl: split into two patches, adjust subject and commit message]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Thomas Kopp 2020-09-25 08:56:06 +02:00 committed by Marc Kleine-Budde
parent 879456bedb
commit 788b83ea2c
1 changed files with 14 additions and 7 deletions
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21
drivers/net/can/spi/mcp25xxfd/mcp25xxfd-core.c
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@ -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) {