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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e On 10/31/26 14:56, netdev-bot+sashiko@kernel.org wrote: > Thank you for your contribution! Sashiko AI review found more severe > issue(s) in other patches of this series. This mail is only an FYI, in case > you want to address the nit picks below when you respin. > > Low priority / nit picks for your consideration: > > - [Low] This patch makes b53_force_port_config() > (drivers/net/dsa/b53/b53_common.c) write BIT(7) of the per-port GMII… > > -- > > net: dsa: b53: use the correct override register 2 Gbps bit > > The IMP and per-port GMII override registers use swapped bit positions > for override-enable and 2 Gbps speed. This patch adds a per-register > speed2000 bit to b53_force_port_config(). The function then uses that bit > both to clear the 2 Gbps selection on 5301x/58xx and to set it for speed > 2000. > >> diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c >> index 378f47e7250cd..75033b28100ec 100644 >> --- a/drivers/net/dsa/b53/b53_common.c >> +++ b/drivers/net/dsa/b53/b53_common.c >> @@ -1370,17 +1370,19 @@ static void b53_force_port_config(struct b53_device *dev, int port, >> int speed, int duplex, >> bool tx_pause, bool rx_pause) >> { >> - u8 reg, val, off; >> + u8 reg, val, off, speed2000; >> >> /* Override the port settings */ >> if (port == dev->imp_port) { >> off = B53_PORT_OVERRIDE_CTRL; >> val = PORT_OVERRIDE_EN; >> + speed2000 = PORT_OVERRIDE_SPEED_2000M; >> } else if (is5325(dev)) { >> return; >> } else { >> off = B53_GMII_PORT_OVERRIDE_CTRL(port); >> val = GMII_PO_EN; >> + speed2000 = GMII_PO_SPEED_2000M; >> } >> >> b53_read8(dev, B53_CTRL_PAGE, off, ®); >> @@ -1392,11 +1394,11 @@ static void b53_force_port_config(struct b53_device *dev, int port, >> >> reg &= ~(0x3 << GMII_PO_SPEED_S); >> if (is5301x(dev) || is58xx(dev)) >> - reg &= ~PORT_OVERRIDE_SPEED_2000M; >> + reg &= ~speed2000; >> >> switch (speed) { >> case 2000: >> - reg |= PORT_OVERRIDE_SPEED_2000M; >> + reg |= speed2000; > > [Severity: Low] > Should the set in case 2000 use the same is5301x() / is58xx() check as > the clear above it? > > On GMII ports, speed2000 is now GMII_PO_SPEED_2000M, and b53_regs.h > documents it as chip-specific: > > #define GMII_PO_EN BIT(6) /* Use the register contents */ > #define GMII_PO_SPEED_2000M BIT(7) /* BCM5301X only, requires setting 1000M */ > > Before this patch, reg |= PORT_OVERRIDE_SPEED_2000M on a GMII port set > BIT(6). That is GMII_PO_EN, and reg |= val had already set it. So on > chips other than 5301x/58xx, speed 2000 behaved the same as 1000. > > With this patch, speed 2000 on a GMII port of any chip that is not > 5301x, 58xx or 5325 (for example BCM53125, BCM5395, BCM5389 or BCM63xx) > writes BIT(7) of B53_GMII_PORT_OVERRIDE_CTRL(port). Since the clear is > gated on is5301x(dev) || is58xx(dev), nothing ever clears that bit again > on those chips. > > Commit b6a8a5477fe9 gated the clear because this bit position "can have > different meanings on other chips, e.g. for BCM5389 this controls > scanning PHYs". The set path was never gated the same way. > > The IMP-port side of this mismatch existed before this patch. This patch > extends it to all GMII ports. > > One way to reach it is a DT fixed-link with speed = <2000> on a GMII port: > phylink_parse_fixedlink() only warns and keeps the speed, and phylink then > calls b53_phylink_mac_link_up()->b53_force_port_config() in MLO_AN_FIXED > mode. The 63xx RGMII path in b53_phylink_mac_link_up() reaches the same > function. > > Would it be better to gate reg |= speed2000 on is5301x(dev) || > is58xx(dev), or to reject speed 2000 on other chips? Agreed. I’ll gate setting the 2 Gbps bit on is5301x() || is58xx(), matching the clear path and preserving chip-specific bits on other devices. This also addresses the pre-existing IMP-port mismatch. pw-bot: cr -- Florian