[PATCH 09/15] drivers: net: davinci_mdio: split reset function on init_clk and enable

[Grygorii Strashko]

The Davinci MDIO MDIO_CONTROL.CLKDIV can be calculated only once
during probe, hence split __davinci_mdio_reset() on
davinci_mdio_init_clk() and davinci_mdio_enable(). Initialize and
save CLKDIV in .probe(). Then just use saved value.

Signed-off-by: Grygorii Strashko <grygorii.stras...@ti.com>
---
 drivers/net/ethernet/ti/davinci_mdio.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/ti/davinci_mdio.c 
b/drivers/net/ethernet/ti/davinci_mdio.c
index b6d0059..b206fd3 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -98,9 +98,10 @@ struct davinci_mdio_data {
         * if MDIO bus is registered from DT.
         */
        bool            skip_scan;
+       u32             clk_div;
 };
 
-static void __davinci_mdio_reset(struct davinci_mdio_data *data)
+static void davinci_mdio_init_clk(struct davinci_mdio_data *data)
 {
        u32 mdio_in, div, mdio_out_khz, access_time;
 
@@ -109,9 +110,7 @@ static void __davinci_mdio_reset(struct davinci_mdio_data 
*data)
        if (div > CONTROL_MAX_DIV)
                div = CONTROL_MAX_DIV;
 
-       /* set enable and clock divider */
-       __raw_writel(div | CONTROL_ENABLE, &data->regs->control);
-
+       data->clk_div = div;
        /*
         * One mdio transaction consists of:
         *      32 bits of preamble
@@ -132,12 +131,18 @@ static void __davinci_mdio_reset(struct davinci_mdio_data 
*data)
                data->access_time = 1;
 }
 
+static void davinci_mdio_enable(struct davinci_mdio_data *data)
+{
+       /* set enable and clock divider */
+       __raw_writel(data->clk_div | CONTROL_ENABLE, &data->regs->control);
+}
+
 static int davinci_mdio_reset(struct mii_bus *bus)
 {
        struct davinci_mdio_data *data = bus->priv;
        u32 phy_mask, ver;
 
-       __davinci_mdio_reset(data);
+       davinci_mdio_enable(data);
 
        /* wait for scan logic to settle */
        msleep(PHY_MAX_ADDR * data->access_time);
@@ -188,7 +193,7 @@ static inline int wait_for_user_access(struct 
davinci_mdio_data *data)
                 * operation
                 */
                dev_warn(data->dev, "resetting idled controller\n");
-               __davinci_mdio_reset(data);
+               davinci_mdio_enable(data);
                return -EAGAIN;
        }
 
@@ -350,6 +355,8 @@ static int davinci_mdio_probe(struct platform_device *pdev)
        if (IS_ERR(data->regs))
                return PTR_ERR(data->regs);
 
+       davinci_mdio_init_clk(data);
+
        pm_runtime_enable(&pdev->dev);
        pm_runtime_get_sync(&pdev->dev);
 
@@ -425,7 +432,7 @@ static int davinci_mdio_resume(struct device *dev)
        pinctrl_pm_select_default_state(dev);
 
        /* restart the scan state machine */
-       __davinci_mdio_reset(data);
+       davinci_mdio_enable(data);
 
        return 0;
 }
-- 
2.8.4