diff options
author | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-05-18 15:55:07 +0100 |
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committer | Jakub Kicinski <kuba@kernel.org> | 2022-05-19 18:14:30 -0700 |
commit | 650a49bc65df6b0e0051a8f62d7c22d95a8f350d (patch) | |
tree | c203cf30d2c640b16ec22805b01e77a4d89039c4 /drivers/net/ethernet/mediatek | |
parent | 1ec619ee4a052fb9ac48b57554ac2722a0bfe73c (diff) | |
download | linux-650a49bc65df6b0e0051a8f62d7c22d95a8f350d.tar.bz2 |
net: mtk_eth_soc: add fixme comment for state->speed use
Add a fixme comment for the last remaining incorrect usage of
state->speed in the mac_config() method, which is strangely in a code
path which is only run when the PHY interface mode changes.
This means if we are in RGMII mode, changes in state->speed will not
cause the INTF_MODE, TRGMII_RCK_CTRL and TRGMII_TCK_CTRL registers to
be set according to the speed, nor will the TRGPLL clock be set to the
correct value.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/mediatek')
-rw-r--r-- | drivers/net/ethernet/mediatek/mtk_eth_soc.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 87b5a837695f..211457a8831d 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -327,6 +327,14 @@ static void mtk_mac_config(struct phylink_config *config, unsigned int mode, state->interface)) goto err_phy; } else { + /* FIXME: this is incorrect. Not only does it + * use state->speed (which is not guaranteed + * to be correct) but it also makes use of it + * in a code path that will only be reachable + * when the PHY interface mode changes, not + * when the speed changes. Consequently, RGMII + * is probably broken. + */ mtk_gmac0_rgmii_adjust(mac->hw, state->interface, state->speed); |