net: phy: mscc-miim: read poll when high resolution timers are disabled

The driver uses a read polling mechanism to check the status of the MDIO
bus, to know if it is ready to accept next commands. This polling
mechanism uses usleep_delay() under the hood between reads which is fine
as long as high resolution timers are enabled. Otherwise the delays will
end up to be much longer than expected.

This patch fixes this by using udelay() under the hood when
CONFIG_HIGH_RES_TIMERS isn't enabled. This increases CPU usage.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 2a32f26ead0b8eb3430164eac9ea2c197b621d1b..047c27087b103f48b155f902ad10eabebb63f986 100644 (file)
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -184,7 +184,8 @@ config MDIO_MSCC_MIIM
        depends on HAS_IOMEM
        help
          This driver supports the MIIM (MDIO) interface found in the network
-         switches of the Microsemi SoCs
+         switches of the Microsemi SoCs; it is recommended to switch on
+         CONFIG_HIGH_RES_TIMERS
 
 config MDIO_MVUSB
        tristate "Marvell USB to MDIO Adapter"

diff --git a/drivers/net/phy/mdio-mscc-miim.c b/drivers/net/phy/mdio-mscc-miim.c
index aed9afa1e8f11cba69a6c1b31e2ab90ab05d0fdf..11f583fd4611fe314042b8f638bf763bf6374b2a 100644 (file)
--- a/drivers/net/phy/mdio-mscc-miim.c
+++ b/drivers/net/phy/mdio-mscc-miim.c
@@ -39,13 +39,25 @@ struct mscc_miim_dev {
        void __iomem *phy_regs;
 };
 
+/* When high resolution timers aren't built-in: we can't use usleep_range() as
+ * we would sleep way too long. Use udelay() instead.
+ */
+#define mscc_readl_poll_timeout(addr, val, cond, delay_us, timeout_us) \
+({                                                                     \
+       if (!IS_ENABLED(CONFIG_HIGH_RES_TIMERS))                        \
+               readl_poll_timeout_atomic(addr, val, cond, delay_us,    \
+                                         timeout_us);                  \
+       readl_poll_timeout(addr, val, cond, delay_us, timeout_us);      \
+})
+
 static int mscc_miim_wait_ready(struct mii_bus *bus)
 {
        struct mscc_miim_dev *miim = bus->priv;
        u32 val;
 
-       return readl_poll_timeout(miim->regs + MSCC_MIIM_REG_STATUS, val,
-                                 !(val & MSCC_MIIM_STATUS_STAT_BUSY), 50, 10000);
+       return mscc_readl_poll_timeout(miim->regs + MSCC_MIIM_REG_STATUS, val,
+                                      !(val & MSCC_MIIM_STATUS_STAT_BUSY), 50,
+                                      10000);
 }
 
 static int mscc_miim_wait_pending(struct mii_bus *bus)
@@ -53,9 +65,9 @@ static int mscc_miim_wait_pending(struct mii_bus *bus)
        struct mscc_miim_dev *miim = bus->priv;
        u32 val;
 
-       return readl_poll_timeout(miim->regs + MSCC_MIIM_REG_STATUS, val,
-                                 !(val & MSCC_MIIM_STATUS_STAT_PENDING),
-                                 50, 10000);
+       return mscc_readl_poll_timeout(miim->regs + MSCC_MIIM_REG_STATUS, val,
+                                      !(val & MSCC_MIIM_STATUS_STAT_PENDING),
+                                      50, 10000);
 }
 
 static int mscc_miim_read(struct mii_bus *bus, int mii_id, int regnum)