Re: [RFC PATCH net-next] net: dsa: mt7530: fix port specifications for MT7988
From: Arınç ÜNAL
Date: Fri Apr 07 2023 - 04:57:03 EST
On 7.04.2023 00:57, Daniel Golle wrote:
On Fri, Apr 07, 2023 at 12:43:41AM +0300, Arınç ÜNAL wrote:
On 6.04.2023 14:07, Russell King (Oracle) wrote:
On Thu, Apr 06, 2023 at 01:04:45PM +0300, arinc9.unal@xxxxxxxxx wrote:
From: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
On the switch on the MT7988 SoC, there are only 4 PHYs. There's only port 6
as the CPU port, there's no port 5. Split the switch statement with a check
to enforce these for the switch on the MT7988 SoC. The internal phy-mode is
specific to MT7988 so put it for MT7988 only.
Signed-off-by: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
---
Daniel, this is based on the information you provided me about the switch.
I will add this to my current patch series if it looks good to you.
Arınç
---
drivers/net/dsa/mt7530.c | 67 ++++++++++++++++++++++++++--------------
1 file changed, 43 insertions(+), 24 deletions(-)
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 6fbbdcb5987f..f167fa135ef1 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2548,7 +2548,7 @@ static void mt7988_mac_port_get_caps(struct dsa_switch *ds, int port,
phy_interface_zero(config->supported_interfaces);
switch (port) {
- case 0 ... 4: /* Internal phy */
+ case 0 ... 3: /* Internal phy */
__set_bit(PHY_INTERFACE_MODE_INTERNAL,
config->supported_interfaces);
break;
@@ -2710,37 +2710,56 @@ mt753x_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
struct mt7530_priv *priv = ds->priv;
u32 mcr_cur, mcr_new;
- switch (port) {
- case 0 ... 4: /* Internal phy */
- if (state->interface != PHY_INTERFACE_MODE_GMII &&
- state->interface != PHY_INTERFACE_MODE_INTERNAL)
- goto unsupported;
- break;
- case 5: /* Port 5, a CPU port. */
- if (priv->p5_interface == state->interface)
+ if (priv->id == ID_MT7988) {
+ switch (port) {
+ case 0 ... 3: /* Internal phy */
+ if (state->interface != PHY_INTERFACE_MODE_INTERNAL)
How do these end up with PHY_INTERFACE_MODE_INTERNAL ? phylib defaults
to GMII mode without something else being specified in DT.
Also note that you should *not* be validating state->interface in the
mac_config() method because it's way too late to reject it - if you get
an unsupported interface here, then that is down to the get_caps()
method being buggy. Only report interfaces in get_caps() that you are
prepared to handle in the rest of the system.
This is already the case for all three get_caps(). The supported interfaces
for each port are properly defined.
Though mt7988_mac_port_get_caps() clears the config->supported_interfaces
bitmap before reporting the supported interfaces. I don't think this is
needed as all bits in the bitmap should already be initialized to zero when
the phylink_config structure is allocated.
I'm not sure if your suggestion is to make sure the supported interfaces are
properly reported on get_caps(), or validate state->interface somewhere
else.
I think what Russell meant is just there is no point in being overly
precise about permitted interface modes in mt753x_phylink_mac_config,
as this function is not meant and called too late to validate the
validity of the selected interface mode.
You change to mt7988_mac_port_get_caps looks correct to me and doing
this will already prevent mt753x_phylink_mac_config from ever being
called on MT7988 for port == 4 as well as and port == 5.
Ah, thanks for pointing this out Daniel. I see
ds->ops->phylink_get_caps() is run right before phylink_create() on
dsa_port_phylink_create(), as it should get the capabilities before
creating an instance.
Should I remove phy_interface_zero(config->supported_interfaces);
mt7988_mac_port_get_caps()? I'd prefer to do identical operations on
each get_caps(), if there's no apparent reason for this to be on
mt7988_mac_port_get_caps().
Arınç