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authorGreg Ungerer <gerg@linux-m68k.org>2020-10-28 15:22:32 +1000
committerFrancesco Dolcini <francesco.dolcini@toradex.com>2022-03-25 15:27:29 +0100
commit0f0011824921d175b0e124c5393e2f8cefa611a8 (patch)
tree449a3515b60e557433a997513d9033f0f37861be
parent249d8ad00c928cd169e2b67275ca423335404d97 (diff)
net: fec: fix MDIO probing for some FEC hardware blocks
[ Upstream commit 1e6114f51f9d4090390fcec2f5d67d8cc8dc4bfc ] Some (apparently older) versions of the FEC hardware block do not like the MMFR register being cleared to avoid generation of MII events at initialization time. The action of clearing this register results in no future MII events being generated at all on the problem block. This means the probing of the MDIO bus will find no PHYs. Create a quirk that can be checked at the FECs MII init time so that the right thing is done. The quirk is set as appropriate for the FEC hardware blocks that are known to need this. Fixes: f166f890c8f0 ("net: ethernet: fec: Replace interrupt driven MDIO with polled IO") Signed-off-by: Greg Ungerer <gerg@linux-m68k.org> Acked-by: Fugang Duan <fugand.duan@nxp.com> Tested-by: Andrew Lunn <andrew@lunn.ch> Tested-by: Clemens Gruber <clemens.gruber@pqgruber.com> Link: https://lore.kernel.org/r/20201028052232.1315167-1-gerg@linux-m68k.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-rw-r--r--drivers/net/ethernet/freescale/fec.h6
-rw-r--r--drivers/net/ethernet/freescale/fec_main.c37
2 files changed, 27 insertions, 16 deletions
diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index 6c9c3b7d3309..8170bc0cd86d 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -487,6 +487,12 @@ struct fec_enet_stop_mode {
u8 req_bit;
};
+/* Some FEC hardware blocks need the MMFR cleared at setup time to avoid
+ * the generation of an MII event. This must be avoided in the older
+ * FEC blocks where it will stop MII events being generated.
+ */
+#define FEC_QUIRK_CLEAR_SETUP_MII (1 << 17)
+
struct bufdesc_prop {
int qid;
/* Address of Rx and Tx buffers */
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index b948355941b4..f600af2541a7 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -106,13 +106,14 @@ static struct platform_device_id fec_devtype[] = {
.name = "imx28-fec",
.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_SWAP_FRAME |
FEC_QUIRK_SINGLE_MDIO | FEC_QUIRK_HAS_RACC |
- FEC_QUIRK_HAS_FRREG,
+ FEC_QUIRK_HAS_FRREG | FEC_QUIRK_CLEAR_SETUP_MII,
}, {
.name = "imx6q-fec",
.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT |
FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM |
FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR006358 |
- FEC_QUIRK_HAS_RACC | FEC_QUIRK_HAS_PMQOS,
+ FEC_QUIRK_HAS_RACC | FEC_QUIRK_HAS_PMQOS |
+ FEC_QUIRK_CLEAR_SETUP_MII,
}, {
.name = "mvf600-fec",
.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_RACC,
@@ -122,14 +123,15 @@ static struct platform_device_id fec_devtype[] = {
FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM |
FEC_QUIRK_HAS_VLAN | FEC_QUIRK_HAS_AVB |
FEC_QUIRK_ERR007885 | FEC_QUIRK_BUG_CAPTURE |
- FEC_QUIRK_HAS_RACC | FEC_QUIRK_HAS_COALESCE,
+ FEC_QUIRK_HAS_RACC | FEC_QUIRK_HAS_COALESCE |
+ FEC_QUIRK_CLEAR_SETUP_MII,
}, {
.name = "imx6ul-fec",
.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT |
FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM |
FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR007885 |
FEC_QUIRK_BUG_CAPTURE | FEC_QUIRK_HAS_RACC |
- FEC_QUIRK_HAS_COALESCE,
+ FEC_QUIRK_HAS_COALESCE | FEC_QUIRK_CLEAR_SETUP_MII,
}, {
.name = "imx8mq-fec",
.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT |
@@ -137,7 +139,7 @@ static struct platform_device_id fec_devtype[] = {
FEC_QUIRK_HAS_VLAN | FEC_QUIRK_HAS_AVB |
FEC_QUIRK_ERR007885 | FEC_QUIRK_BUG_CAPTURE |
FEC_QUIRK_HAS_RACC | FEC_QUIRK_HAS_COALESCE |
- FEC_QUIRK_HAS_EEE,
+ FEC_QUIRK_HAS_EEE | FEC_QUIRK_CLEAR_SETUP_MII,
}, {
.name = "imx8qm-fec",
.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT |
@@ -145,13 +147,14 @@ static struct platform_device_id fec_devtype[] = {
FEC_QUIRK_HAS_VLAN | FEC_QUIRK_HAS_AVB |
FEC_QUIRK_ERR007885 | FEC_QUIRK_BUG_CAPTURE |
FEC_QUIRK_HAS_RACC | FEC_QUIRK_HAS_COALESCE |
- FEC_QUIRK_DELAYED_CLKS_SUPPORT,
+ FEC_QUIRK_DELAYED_CLKS_SUPPORT | FEC_QUIRK_CLEAR_SETUP_MII,
}, {
.name = "s32v234-fec",
.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT |
FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM |
FEC_QUIRK_HAS_VLAN | FEC_QUIRK_HAS_AVB |
- FEC_QUIRK_ERR007885 | FEC_QUIRK_BUG_CAPTURE,
+ FEC_QUIRK_ERR007885 | FEC_QUIRK_BUG_CAPTURE |
+ FEC_QUIRK_CLEAR_SETUP_MII,
}, {
/* sentinel */
}
@@ -2249,15 +2252,17 @@ static int fec_enet_mii_init(struct platform_device *pdev)
fep->phy_speed = mii_speed << 1 | holdtime << 8;
- /* Clear MMFR to avoid to generate MII event by writing MSCR.
- * MII event generation condition:
- * - writing MSCR:
- * - mmfr[31:0]_not_zero & mscr[7:0]_is_zero &
- * mscr_reg_data_in[7:0] != 0
- * - writing MMFR:
- * - mscr[7:0]_not_zero
- */
- writel(0, fep->hwp + FEC_MII_DATA);
+ if (fep->quirks & FEC_QUIRK_CLEAR_SETUP_MII) {
+ /* Clear MMFR to avoid to generate MII event by writing MSCR.
+ * MII event generation condition:
+ * - writing MSCR:
+ * - mmfr[31:0]_not_zero & mscr[7:0]_is_zero &
+ * mscr_reg_data_in[7:0] != 0
+ * - writing MMFR:
+ * - mscr[7:0]_not_zero
+ */
+ writel(0, fep->hwp + FEC_MII_DATA);
+ }
writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);