backport of commit 1e93ed26acf03fe6c97c6d573a10178596aadd43 upstream.
The systemid property was checked for in the wrong place of the device tree and compared to the wrong value.
Fixes: 6cec9b07fe6a ("can: grcan: Add device driver for GRCAN and GRHCAN cores") Link: https://lore.kernel.org/all/20220429084656.29788-3-andreas@gaisler.com Cc: stable@vger.kernel.org Signed-off-by: Andreas Larsson andreas@gaisler.com Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de --- drivers/net/can/grcan.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/drivers/net/can/grcan.c b/drivers/net/can/grcan.c index a2dbd7ae9db2..e126516ba648 100644 --- a/drivers/net/can/grcan.c +++ b/drivers/net/can/grcan.c @@ -245,7 +245,7 @@ struct grcan_device_config { .rxsize = GRCAN_DEFAULT_BUFFER_SIZE, \ }
-#define GRCAN_TXBUG_SAFE_GRLIB_VERSION 0x4100 +#define GRCAN_TXBUG_SAFE_GRLIB_VERSION 4100 #define GRLIB_VERSION_MASK 0xffff
/* GRCAN private data structure */ @@ -1665,6 +1665,7 @@ static int grcan_setup_netdev(struct platform_device *ofdev, static int grcan_probe(struct platform_device *ofdev) { struct device_node *np = ofdev->dev.of_node; + struct device_node *sysid_parent; struct resource *res; u32 sysid, ambafreq; int irq, err; @@ -1674,10 +1675,15 @@ static int grcan_probe(struct platform_device *ofdev) /* Compare GRLIB version number with the first that does not * have the tx bug (see start_xmit) */ - err = of_property_read_u32(np, "systemid", &sysid); - if (!err && ((sysid & GRLIB_VERSION_MASK) - >= GRCAN_TXBUG_SAFE_GRLIB_VERSION)) - txbug = false; + sysid_parent = of_find_node_by_path("/ambapp0"); + if (sysid_parent) { + of_node_get(sysid_parent); + err = of_property_read_u32(sysid_parent, "systemid", &sysid); + if (!err && ((sysid & GRLIB_VERSION_MASK) >= + GRCAN_TXBUG_SAFE_GRLIB_VERSION)) + txbug = false; + of_node_put(sysid_parent); + }
err = of_property_read_u32(np, "freq", &ambafreq); if (err) {