FAILED: patch "[PATCH] net/fsl: xgmac_mdio: Add workaround for erratum A-009885" failed to apply to 4.4-stable tree

The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 6198c722019774d38018457a8bfb9ba3ed8c931e Mon Sep 17 00:00:00 2001 From: Tobias Waldekranz tobias@waldekranz.com Date: Tue, 18 Jan 2022 22:50:50 +0100 Subject: [PATCH] net/fsl: xgmac_mdio: Add workaround for erratum A-009885

Once an MDIO read transaction is initiated, we must read back the data register within 16 MDC cycles after the transaction completes. Outside of this window, reads may return corrupt data.

Therefore, disable local interrupts in the critical section, to maximize the probability that we can satisfy this requirement.

Fixes: d55ad2967d89 ("powerpc/mpc85xx: Create dts components for the FSL QorIQ DPAA FMan") Signed-off-by: Tobias Waldekranz tobias@waldekranz.com Reviewed-by: Andrew Lunn andrew@lunn.ch Signed-off-by: Jakub Kicinski kuba@kernel.org

diff --git a/drivers/net/ethernet/freescale/xgmac_mdio.c b/drivers/net/ethernet/freescale/xgmac_mdio.c index 5b8b9bcf41a2..bf566ac3195b 100644 --- a/drivers/net/ethernet/freescale/xgmac_mdio.c +++ b/drivers/net/ethernet/freescale/xgmac_mdio.c @@ -51,6 +51,7 @@ struct tgec_mdio_controller { struct mdio_fsl_priv { struct tgec_mdio_controller __iomem *mdio_base; bool is_little_endian; + bool has_a009885; bool has_a011043; };

@@ -186,10 +187,10 @@ static int xgmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum) { struct mdio_fsl_priv *priv = (struct mdio_fsl_priv *)bus->priv; struct tgec_mdio_controller __iomem *regs = priv->mdio_base; + unsigned long flags; uint16_t dev_addr; uint32_t mdio_stat; uint32_t mdio_ctl; - uint16_t value; int ret; bool endian = priv->is_little_endian;

@@ -221,12 +222,18 @@ static int xgmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum) return ret; }

+ if (priv->has_a009885) + /* Once the operation completes, i.e. MDIO_STAT_BSY clears, we + * must read back the data register within 16 MDC cycles. + */ + local_irq_save(flags); + /* Initiate the read */ xgmac_write32(mdio_ctl | MDIO_CTL_READ, &regs->mdio_ctl, endian);

ret = xgmac_wait_until_done(&bus->dev, regs, endian); if (ret) - return ret; + goto irq_restore;

/* Return all Fs if nothing was there */ if ((xgmac_read32(&regs->mdio_stat, endian) & MDIO_STAT_RD_ER) && @@ -234,13 +241,17 @@ static int xgmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum) dev_dbg(&bus->dev, "Error while reading PHY%d reg at %d.%hhu\n", phy_id, dev_addr, regnum); - return 0xffff; + ret = 0xffff; + } else { + ret = xgmac_read32(&regs->mdio_data, endian) & 0xffff; + dev_dbg(&bus->dev, "read %04x\n", ret); }

- value = xgmac_read32(&regs->mdio_data, endian) & 0xffff; - dev_dbg(&bus->dev, "read %04x\n", value); +irq_restore: + if (priv->has_a009885) + local_irq_restore(flags);

- return value; + return ret; }

static int xgmac_mdio_probe(struct platform_device *pdev) @@ -287,6 +298,8 @@ static int xgmac_mdio_probe(struct platform_device *pdev) priv->is_little_endian = device_property_read_bool(&pdev->dev, "little-endian");

+ priv->has_a009885 = device_property_read_bool(&pdev->dev, + "fsl,erratum-a009885"); priv->has_a011043 = device_property_read_bool(&pdev->dev, "fsl,erratum-a011043");