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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2018-04-25 16:50:39 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2018-05-08 10:41:38 +0200
commit0e030a373df3b8792b8991740fc31fe0629c6e58 (patch)
treeec7618de4b21dd6736f14d6d9d1ad091876ac2c9 /drivers/net
parent71c23a821c6bcacba71a094efe49ee689605906b (diff)
downloadlinux-0e030a373df3b8792b8991740fc31fe0629c6e58.tar.bz2
can: flexcan: fix endianess detection
In commit 88462d2a7830 ("can: flexcan: Remodel FlexCAN register r/w APIs for big endian FlexCAN controllers.") the following logic was implemented: if the dt property "big-endian" is given or the device is compatible to "fsl,p1010-flexcan": use big-endian mode; else use little-endian mode; This relies on commit d50f4630c2e1 ("arm: dts: Remove p1010-flexcan compatible from imx series dts") which was applied a few commits later. Without this commit (or an old device tree used for booting a new kernel) the flexcan devices on i.MX25, i.MX28, i.MX35 and i.MX53 match the 'the device is compatible to "fsl,p1010-flexcan"' test and so are switched erroneously to big endian mode. Instead of the check above put a quirk in devtype data and rely on of_match_device yielding the most compatible match Fixes: 88462d2a7830 ("can: flexcan: Remodel FlexCAN register r/w APIs for big endian FlexCAN controllers.") Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Tested-by: Gavin Schenk <g.schenk@eckelmann.de> Cc: linux-stable <stable@vger.kernel.org> # >= v4.16 Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/can/flexcan.c26
1 files changed, 14 insertions, 12 deletions
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 634c51e6b8ae..d53a45bf2a72 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -200,6 +200,7 @@
#define FLEXCAN_QUIRK_DISABLE_MECR BIT(4) /* Disable Memory error detection */
#define FLEXCAN_QUIRK_USE_OFF_TIMESTAMP BIT(5) /* Use timestamp based offloading */
#define FLEXCAN_QUIRK_BROKEN_PERR_STATE BIT(6) /* No interrupt for error passive */
+#define FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN BIT(7) /* default to BE register access */
/* Structure of the message buffer */
struct flexcan_mb {
@@ -288,6 +289,12 @@ struct flexcan_priv {
static const struct flexcan_devtype_data fsl_p1010_devtype_data = {
.quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE |
+ FLEXCAN_QUIRK_BROKEN_PERR_STATE |
+ FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN,
+};
+
+static const struct flexcan_devtype_data fsl_imx25_devtype_data = {
+ .quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE |
FLEXCAN_QUIRK_BROKEN_PERR_STATE,
};
@@ -1251,9 +1258,9 @@ static void unregister_flexcandev(struct net_device *dev)
static const struct of_device_id flexcan_of_match[] = {
{ .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, },
{ .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, },
- { .compatible = "fsl,imx53-flexcan", .data = &fsl_p1010_devtype_data, },
- { .compatible = "fsl,imx35-flexcan", .data = &fsl_p1010_devtype_data, },
- { .compatible = "fsl,imx25-flexcan", .data = &fsl_p1010_devtype_data, },
+ { .compatible = "fsl,imx53-flexcan", .data = &fsl_imx25_devtype_data, },
+ { .compatible = "fsl,imx35-flexcan", .data = &fsl_imx25_devtype_data, },
+ { .compatible = "fsl,imx25-flexcan", .data = &fsl_imx25_devtype_data, },
{ .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, },
{ .compatible = "fsl,vf610-flexcan", .data = &fsl_vf610_devtype_data, },
{ .compatible = "fsl,ls1021ar2-flexcan", .data = &fsl_ls1021a_r2_devtype_data, },
@@ -1337,18 +1344,13 @@ static int flexcan_probe(struct platform_device *pdev)
priv = netdev_priv(dev);
- if (of_property_read_bool(pdev->dev.of_node, "big-endian")) {
+ if (of_property_read_bool(pdev->dev.of_node, "big-endian") ||
+ devtype_data->quirks & FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN) {
priv->read = flexcan_read_be;
priv->write = flexcan_write_be;
} else {
- if (of_device_is_compatible(pdev->dev.of_node,
- "fsl,p1010-flexcan")) {
- priv->read = flexcan_read_be;
- priv->write = flexcan_write_be;
- } else {
- priv->read = flexcan_read_le;
- priv->write = flexcan_write_le;
- }
+ priv->read = flexcan_read_le;
+ priv->write = flexcan_write_le;
}
priv->can.clock.freq = clock_freq;