6.6-stable review patch. If anyone has any objections, please let me know.
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From: Csókás, Bence csokas.bence@prolan.hu
[ Upstream commit 67800d296191d0a9bde0a7776f99ca1ddfa0fc26 ]
The core is reset both in `fec_restart()` (called on link-up) and `fec_stop()` (going to sleep, driver remove etc.). These two functions had their separate implementations, which was at first only a register write and a `udelay()` (and the accompanying block comment). However, since then we got soft-reset (MAC disable) and Wake-on-LAN support, which meant that these implementations diverged, often causing bugs.
For instance, as of now, `fec_stop()` does not check for `FEC_QUIRK_NO_HARD_RESET`, meaning the MII/RMII mode is cleared on eg. a PM power-down event; and `fec_restart()` missed the refactor renaming the "magic" constant `1` to `FEC_ECR_RESET`.
To harmonize current implementations, and eliminate this source of potential future bugs, refactor implementation to a common function.
Reviewed-by: Michal Swiatkowski michal.swiatkowski@linux.intel.com Reviewed-by: Jacob Keller jacob.e.keller@intel.com Reviewed-by: Simon Horman horms@kernel.org Signed-off-by: Csókás, Bence csokas.bence@prolan.hu Link: https://patch.msgid.link/20250207121255.161146-2-csokas.bence@prolan.hu Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/freescale/fec_main.c | 52 +++++++++++------------ 1 file changed, 25 insertions(+), 27 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 7261838a09db6..291c88a76a27f 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -1079,6 +1079,29 @@ static void fec_enet_enable_ring(struct net_device *ndev) } }
+/* Whack a reset. We should wait for this. + * For i.MX6SX SOC, enet use AXI bus, we use disable MAC + * instead of reset MAC itself. + */ +static void fec_ctrl_reset(struct fec_enet_private *fep, bool allow_wol) +{ + u32 val; + + if (!allow_wol || !(fep->wol_flag & FEC_WOL_FLAG_SLEEP_ON)) { + if (fep->quirks & FEC_QUIRK_HAS_MULTI_QUEUES || + ((fep->quirks & FEC_QUIRK_NO_HARD_RESET) && fep->link)) { + writel(0, fep->hwp + FEC_ECNTRL); + } else { + writel(FEC_ECR_RESET, fep->hwp + FEC_ECNTRL); + udelay(10); + } + } else { + val = readl(fep->hwp + FEC_ECNTRL); + val |= (FEC_ECR_MAGICEN | FEC_ECR_SLEEP); + writel(val, fep->hwp + FEC_ECNTRL); + } +} + /* * This function is called to start or restart the FEC during a link * change, transmit timeout, or to reconfigure the FEC. The network @@ -1095,17 +1118,7 @@ fec_restart(struct net_device *ndev) if (fep->bufdesc_ex) fec_ptp_save_state(fep);
- /* Whack a reset. We should wait for this. - * For i.MX6SX SOC, enet use AXI bus, we use disable MAC - * instead of reset MAC itself. - */ - if (fep->quirks & FEC_QUIRK_HAS_MULTI_QUEUES || - ((fep->quirks & FEC_QUIRK_NO_HARD_RESET) && fep->link)) { - writel(0, fep->hwp + FEC_ECNTRL); - } else { - writel(1, fep->hwp + FEC_ECNTRL); - udelay(10); - } + fec_ctrl_reset(fep, false);
/* * enet-mac reset will reset mac address registers too, @@ -1359,22 +1372,7 @@ fec_stop(struct net_device *ndev) if (fep->bufdesc_ex) fec_ptp_save_state(fep);
- /* Whack a reset. We should wait for this. - * For i.MX6SX SOC, enet use AXI bus, we use disable MAC - * instead of reset MAC itself. - */ - if (!(fep->wol_flag & FEC_WOL_FLAG_SLEEP_ON)) { - if (fep->quirks & FEC_QUIRK_HAS_MULTI_QUEUES) { - writel(0, fep->hwp + FEC_ECNTRL); - } else { - writel(FEC_ECR_RESET, fep->hwp + FEC_ECNTRL); - udelay(10); - } - } else { - val = readl(fep->hwp + FEC_ECNTRL); - val |= (FEC_ECR_MAGICEN | FEC_ECR_SLEEP); - writel(val, fep->hwp + FEC_ECNTRL); - } + fec_ctrl_reset(fep, true); writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED); writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK);