i2c: imx: use clk notifier for rate changes

Instead of repeatedly calling clk_get_rate for each transfer, register
a clock notifier to update the cached divider value each time the clock
rate actually changes.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 25 insertions, 7 deletions

diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 999557729ad2..c9632b2f0eaa 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -194,6 +194,7 @@ struct imx_i2c_dma {
 struct imx_i2c_struct {
         struct i2c_adapter      adapter;
         struct clk              *clk;
+        struct notifier_block   clk_change_nb;
         void __iomem            *base;
         wait_queue_head_t       queue;
         unsigned long           i2csr;
@@ -467,15 +468,14 @@ static int i2c_imx_acked(struct imx_i2c_struct *i2c_imx)
         return 0;
 }
 
-static void i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx)
+static void i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx,
+                            unsigned int i2c_clk_rate)
 {
         struct imx_i2c_clk_pair *i2c_clk_div = i2c_imx->hwdata->clk_div;
-        unsigned int i2c_clk_rate;
         unsigned int div;
         int i;
 
         /* Divider value calculation */
-        i2c_clk_rate = clk_get_rate(i2c_imx->clk);
         if (i2c_imx->cur_clk == i2c_clk_rate)
                 return;
 
@@ -510,6 +510,20 @@ static void i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx)
 #endif
 }
 
+static int i2c_imx_clk_notifier_call(struct notifier_block *nb,
+                                     unsigned long action, void *data)
+{
+        struct clk_notifier_data *ndata = data;
+        struct imx_i2c_struct *i2c_imx = container_of(&ndata->clk,
+                                                      struct imx_i2c_struct,
+                                                      clk);
+
+        if (action & POST_RATE_CHANGE)
+                i2c_imx_set_clk(i2c_imx, ndata->new_rate);
+
+        return NOTIFY_OK;
+}
+
 static int i2c_imx_start(struct imx_i2c_struct *i2c_imx)
 {
         unsigned int temp = 0;
@@ -517,8 +531,6 @@ static int i2c_imx_start(struct imx_i2c_struct *i2c_imx)
 
         dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
 
-        i2c_imx_set_clk(i2c_imx);
-
         imx_i2c_write_reg(i2c_imx->ifdr, i2c_imx, IMX_I2C_IFDR);
         /* Enable I2C controller */
         imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR);
@@ -1131,6 +1143,9 @@ static int i2c_imx_probe(struct platform_device *pdev)
                                    "clock-frequency", &i2c_imx->bitrate);
         if (ret < 0 && pdata && pdata->bitrate)
                 i2c_imx->bitrate = pdata->bitrate;
+        i2c_imx->clk_change_nb.notifier_call = i2c_imx_clk_notifier_call;
+        clk_notifier_register(i2c_imx->clk, &i2c_imx->clk_change_nb);
+        i2c_imx_set_clk(i2c_imx, clk_get_rate(i2c_imx->clk));
 
         /* Set up chip registers to defaults */
         imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN,
@@ -1141,12 +1156,12 @@ static int i2c_imx_probe(struct platform_device *pdev)
         ret = i2c_imx_init_recovery_info(i2c_imx, pdev);
         /* Give it another chance if pinctrl used is not ready yet */
         if (ret == -EPROBE_DEFER)
-                goto rpm_disable;
+                goto clk_notifier_unregister;
 
         /* Add I2C adapter */
         ret = i2c_add_numbered_adapter(&i2c_imx->adapter);
         if (ret < 0)
-                goto rpm_disable;
+                goto clk_notifier_unregister;
 
         pm_runtime_mark_last_busy(&pdev->dev);
         pm_runtime_put_autosuspend(&pdev->dev);
@@ -1162,6 +1177,8 @@ static int i2c_imx_probe(struct platform_device *pdev)
 
         return 0;   /* Return OK */
 
+clk_notifier_unregister:
+        clk_notifier_unregister(i2c_imx->clk, &i2c_imx->clk_change_nb);
 rpm_disable:
         pm_runtime_put_noidle(&pdev->dev);
         pm_runtime_disable(&pdev->dev);
@@ -1195,6 +1212,7 @@ static int i2c_imx_remove(struct platform_device *pdev)
         imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2CR);
         imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR);
 
+        clk_notifier_unregister(i2c_imx->clk, &i2c_imx->clk_change_nb);
         clk_disable_unprepare(i2c_imx->clk);
 
         pm_runtime_put_noidle(&pdev->dev);