401a6ccfaf
Backport lots upstream changes, many of them fixes, for the mt7530 DSA driver. Some of them may or may not find they way into Linux 6.1 stable, some certainly won't because they are fixes for backported commits which aren't even present in Linux 6.1 upstream. Apart from adding new patches, also remove mutated patch 723-net-mt7531-ensure-all-MACs-are-powered-down-before-r.patch which should never have been added for Linux 6.1 -- it was applied already upstream but coincidentally would fuzzy-apply in the wrong place as well (for MT7530 instead of MT7531). While that didn't really hurt anyone it is just unneeded. The other deleted patch 795-mt7530-register-OF-node-for-internal-MDIO-bus.patch has been replaced by an equivalent commit with a more complete patch description by upstream maintainer Arınç Ünal. The remaining differences compared to the upstream driver are: * C22/C45 MDIO ops aren't split Upstream did that, backporting it would require making changes to *all* DSA drivers * 'slave' -> 'user', 'master' -> 'conduit' language change in DSA * support for selecting preferred CPU port on MT7531 Also this would require too many DSA framework changes potentially affecting other devices. If we ever really use Linux 6.1 in a release (I hope not) we can still reconsider to make the effort to backport that. In addition to some minor bug fixes and style improvements the switch should now behave more conformant when it comes to link-local frames, and we will again be able to cleanly pick patches from upstream. MAINTAIERS NOTE: Three patches are already part of Linux stable and should be removed with the next minor kernel version bump: 789-STABLE-01-net-dsa-mt7530-prevent-possible-incorrect-XTAL-frequ.patch 789-STABLE-02-net-dsa-mt7530-fix-link-local-frames-that-ingress-vl.patch 789-STABLE-03-net-dsa-mt7530-fix-handling-of-all-link-local-frames.patch Signed-off-by: Daniel Golle <daniel@makrotopia.org>
48 lines
1.6 KiB
Diff
48 lines
1.6 KiB
Diff
From 86e1168a214b7ab0883acf1e7a6885a7a949e3e7 Mon Sep 17 00:00:00 2001
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From: Daniel Golle <daniel@makrotopia.org>
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Date: Mon, 3 Apr 2023 02:19:28 +0100
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Subject: [PATCH 13/48] net: dsa: mt7530: skip locking if MDIO bus isn't
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present
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As MT7530 and MT7531 internally use 32-bit wide registers, each access
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to any register of the switch requires several operations on the MDIO
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bus. Hence if there is congruent access, e.g. due to PCS or PHY
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polling, this can mess up and interfere with another ongoing register
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access sequence.
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However, the MDIO bus mutex is only relevant for MDIO-connected
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switches. Prepare switches which have there registers directly mapped
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into the SoCs register space via MMIO which do not require such
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locking. There we can simply use regmap's default locking mechanism.
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Hence guard mutex operations to only be performed in case of MDIO
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connected switches.
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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Reviewed-by: Andrew Lunn <andrew@lunn.ch>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/dsa/mt7530.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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--- a/drivers/net/dsa/mt7530.c
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+++ b/drivers/net/dsa/mt7530.c
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@@ -144,13 +144,15 @@ err:
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static void
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mt7530_mutex_lock(struct mt7530_priv *priv)
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{
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- mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
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+ if (priv->bus)
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+ mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
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}
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static void
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mt7530_mutex_unlock(struct mt7530_priv *priv)
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{
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- mutex_unlock(&priv->bus->mdio_lock);
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+ if (priv->bus)
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+ mutex_unlock(&priv->bus->mdio_lock);
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}
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static void
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