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Message-Id: <20240311-rxc_bugfix-v6-2-adf5133829a2@bootlin.com>
Date: Mon, 11 Mar 2024 10:55:45 +0100
From: Romain Gantois <romain.gantois@...tlin.com>
To: Russell King <linux@...linux.org.uk>, Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Clément Léger <clement.leger@...tlin.com>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org, linux-renesas-soc@...r.kernel.org,
"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
Romain Gantois <romain.gantois@...tlin.com>
Subject: [PATCH net-next v6 2/7] net: phylink: add rxc_always_on flag to
phylink_pcs
Some MAC drivers (e.g. stmmac) require a continuous receive clock signal to
be generated by a PCS that is handled by a standalone PCS driver.
Such a PCS driver does not have access to a PHY device, thus cannot check
the PHY_F_RXC_ALWAYS_ON flag. They cannot check max_requires_rxc in the
phylink config either, since it is a private member. Therefore, a new flag
is needed to signal to the PCS that it should keep the RX clock signal up
at all times.
Co-developed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
drivers/net/phy/phylink.c | 15 +++++++++++++++
include/linux/phylink.h | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 53 insertions(+)
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 2bb583543dea..84a97088dfc6 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1042,6 +1042,21 @@ static void phylink_pcs_poll_start(struct phylink *pl)
mod_timer(&pl->link_poll, jiffies + HZ);
}
+int phylink_pcs_pre_init(struct phylink *pl, struct phylink_pcs *pcs)
+{
+ int ret = 0;
+
+ /* Signal to PCS driver that MAC requires RX clock for init */
+ if (pl->config->mac_requires_rxc)
+ pcs->rxc_always_on = true;
+
+ if (pcs->ops->pcs_pre_init)
+ ret = pcs->ops->pcs_pre_init(pcs);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(phylink_pcs_pre_init);
+
static void phylink_mac_config(struct phylink *pl,
const struct phylink_link_state *state)
{
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index fef8ae66b988..5ea6b2ad2396 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -396,6 +396,10 @@ struct phylink_pcs_ops;
* @phylink: pointer to &struct phylink_config
* @neg_mode: provide PCS neg mode via "mode" argument
* @poll: poll the PCS for link changes
+ * @rxc_always_on: The MAC driver requires the reference clock
+ * to always be on. Standalone PCS drivers which
+ * do not have access to a PHY device can check
+ * this instead of PHY_F_RXC_ALWAYS_ON.
*
* This structure is designed to be embedded within the PCS private data,
* and will be passed between phylink and the PCS.
@@ -408,6 +412,7 @@ struct phylink_pcs {
struct phylink *phylink;
bool neg_mode;
bool poll;
+ bool rxc_always_on;
};
/**
@@ -422,6 +427,8 @@ struct phylink_pcs {
* @pcs_an_restart: restart 802.3z BaseX autonegotiation.
* @pcs_link_up: program the PCS for the resolved link configuration
* (where necessary).
+ * @pcs_pre_init: configure PCS components necessary for MAC hardware
+ * initialization e.g. RX clock for stmmac.
*/
struct phylink_pcs_ops {
int (*pcs_validate)(struct phylink_pcs *pcs, unsigned long *supported,
@@ -441,6 +448,7 @@ struct phylink_pcs_ops {
void (*pcs_an_restart)(struct phylink_pcs *pcs);
void (*pcs_link_up)(struct phylink_pcs *pcs, unsigned int neg_mode,
phy_interface_t interface, int speed, int duplex);
+ int (*pcs_pre_init)(struct phylink_pcs *pcs);
};
#if 0 /* For kernel-doc purposes only. */
@@ -546,6 +554,34 @@ void pcs_an_restart(struct phylink_pcs *pcs);
*/
void pcs_link_up(struct phylink_pcs *pcs, unsigned int neg_mode,
phy_interface_t interface, int speed, int duplex);
+
+/**
+ * pcs_pre_init() - Configure PCS components necessary for MAC initialization
+ * @pcs: a pointer to a &struct phylink_pcs.
+ *
+ * This function can be called by MAC drivers through the
+ * phylink_pcs_pre_init() wrapper, before their hardware is initialized. It
+ * should not be called after the link is brought up, as reconfiguring the PCS
+ * at this point could break the link.
+ *
+ * Some MAC devices require specific hardware initialization to be performed by
+ * their associated PCS device before they can properly initialize their own
+ * hardware. An example of this is the initialization of stmmac controllers,
+ * which requires an active REF_CLK signal to be provided by the PHY/PCS.
+ *
+ * By calling phylink_pcs_pre_init(), MAC drivers can ensure that the PCS is
+ * setup in a way that allows for successful hardware initialization.
+ *
+ * The specific configuration performed by pcs_pre_init() is dependent on the
+ * model of PCS and the requirements of the MAC device attached to it. PCS
+ * driver authors should consider whether their target device is to be used in
+ * conjunction with a MAC device whose driver calls phylink_pcs_pre_init(). MAC
+ * driver authors should document their requirements for the PCS
+ * pre-initialization.
+ *
+ */
+int pcs_pre_init(struct phylink_pcs *pcs);
+
#endif
struct phylink *phylink_create(struct phylink_config *,
@@ -565,6 +601,8 @@ void phylink_disconnect_phy(struct phylink *);
void phylink_mac_change(struct phylink *, bool up);
void phylink_pcs_change(struct phylink_pcs *, bool up);
+int phylink_pcs_pre_init(struct phylink *pl, struct phylink_pcs *pcs);
+
void phylink_start(struct phylink *);
void phylink_stop(struct phylink *);
--
2.44.0
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