Re: [PATCH net] net: phy: nxp-c45-tja11xx: disable port and global interrupts

On Thu, Apr 06, 2023 at 12:55:46PM +0300, Radu Pirea (OSS) wrote:

Disabling only the link event irq is not enough to disable the interrupts. PTP will still be able to generate interrupts.

The interrupts are organised in a tree on the C45 TJA11XX PHYs. To completely disable the interrupts, they are disable from the top of the interrupt tree.

Fixes: 514def5dd339 ("phy: nxp-c45-tja11xx: add timestamping support") CC: stable@vger.kernel.org # 5.15+ Signed-off-by: Radu Pirea (OSS) radu-nicolae.pirea@oss.nxp.com

---

drivers/net/phy/nxp-c45-tja11xx.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/net/phy/nxp-c45-tja11xx.c b/drivers/net/phy/nxp-c45-tja11xx.c index 029875a59ff8..ce718a5865a4 100644 --- a/drivers/net/phy/nxp-c45-tja11xx.c +++ b/drivers/net/phy/nxp-c45-tja11xx.c @@ -31,6 +31,10 @@ #define DEVICE_CONTROL_CONFIG_GLOBAL_EN BIT(14) #define DEVICE_CONTROL_CONFIG_ALL_EN BIT(13) +#define VEND1_PORT_IRQ_ENABLES 0x0072 +#define PORT1_IRQ BIT(1) +#define GLOBAL_IRQ BIT(0)

I find the PORT1 confusing there, it suggests there is a port0? What is port0? There is no other reference to numbered ports in the driver.

-static bool nxp_c45_poll_txts(struct phy_device *phydev) +static bool nxp_c45_poll(struct phy_device *phydev) { return phydev->irq <= 0; }

Maybe as a new patch, but phy_interrupt_is_valid() can be used here.

Maybe also extend the commit message to include a comment that functions names are changed to reflect that all interrupts are now disabled, not just _txts interrupts. Otherwise this rename might be considered an unrelated change.

@@ -448,7 +452,7 @@ static void nxp_c45_process_txts(struct nxp_c45_phy *priv, static long nxp_c45_do_aux_work(struct ptp_clock_info *ptp) { struct nxp_c45_phy *priv = container_of(ptp, struct nxp_c45_phy, caps);

• bool poll_txts = nxp_c45_poll_txts(priv->phydev);

• bool poll_txts = nxp_c45_poll(priv->phydev); struct skb_shared_hwtstamps *shhwtstamps_rx; struct ptp_clock_event event; struct nxp_c45_hwts hwts;

@@ -699,7 +703,7 @@ static void nxp_c45_txtstamp(struct mii_timestamper *mii_ts, NXP_C45_SKB_CB(skb)->header = ptp_parse_header(skb, type); skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; skb_queue_tail(&priv->tx_queue, skb);

• if (nxp_c45_poll_txts(priv->phydev))
  

• if (nxp_c45_poll(priv->phydev))
  ptp_schedule_worker(priv->ptp_clock, 0);
  

  break; case HWTSTAMP_TX_OFF:

@@ -772,7 +776,7 @@ static int nxp_c45_hwtstamp(struct mii_timestamper *mii_ts, PORT_PTP_CONTROL_BYPASS); }

• if (nxp_c45_poll_txts(priv->phydev))

• if (nxp_c45_poll(priv->phydev)) goto nxp_c45_no_ptp_irq;

if (priv->hwts_tx) @@ -892,10 +896,12 @@ static int nxp_c45_config_intr(struct phy_device *phydev) { if (phydev->interrupts == PHY_INTERRUPT_ENABLED) return phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,

• 			VEND1_PHY_IRQ_EN, PHY_IRQ_LINK_EVENT);
  

• 			VEND1_PORT_IRQ_ENABLES,
  

• 			PORT1_IRQ | GLOBAL_IRQ);
  

  else return phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,

• 			  VEND1_PHY_IRQ_EN, PHY_IRQ_LINK_EVENT);
  

• 			  VEND1_PORT_IRQ_ENABLES,
  

• 			  PORT1_IRQ | GLOBAL_IRQ);
  

} static irqreturn_t nxp_c45_handle_interrupt(struct phy_device *phydev) @@ -1290,6 +1296,10 @@ static int nxp_c45_config_init(struct phy_device *phydev) phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_PORT_FUNC_ENABLES, PTP_ENABLE);

• if (!nxp_c45_poll(phydev))

• phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
  

• 		 VEND1_PHY_IRQ_EN, PHY_IRQ_LINK_EVENT);
  

It seems odd to be touching interrupt configuration outside of nxp_c45_config_intr(). Is there a reason this cannot be part of phydev->interrupts == PHY_INTERRUPT_ENABLED ?

Andrew