clk: si5351: Wait for bit clear after PLL reset

Documentation states that SI5351_PLL_RESET_B and SI5351_PLL_RESET_A bits
are self clearing bits, so wait until they are cleared before
continuing.
This fixes a case when the clock doesn't come up properly after a PLL
reset. It worked properly when the frequency was below 900MHz, but with
900MHz it only works when we are waiting for the bit to clear.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20201130091033.1687-1-s.hauer@pengutronix.deSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/clk-si5351.c

@@ -902,6 +902,10 @@ static int _si5351_clkout_set_disable_state(
 static void _si5351_clkout_reset_pll(struct si5351_driver_data *drvdata, int num)
 {
 	u8 val = si5351_reg_read(drvdata, SI5351_CLK0_CTRL + num);
+	u8 mask = val & SI5351_CLK_PLL_SELECT ? SI5351_PLL_RESET_B :
+						       SI5351_PLL_RESET_A;
+	unsigned int v;
+	int err;
 
 	switch (val & SI5351_CLK_INPUT_MASK) {
 	case SI5351_CLK_INPUT_XTAL:
@@ -909,9 +913,12 @@ static void _si5351_clkout_reset_pll(struct si5351_driver_data *drvdata, int num
 		return;  /* pll not used, no need to reset */
 	}
 
-	si5351_reg_write(drvdata, SI5351_PLL_RESET,
-			 val & SI5351_CLK_PLL_SELECT ? SI5351_PLL_RESET_B :
-						       SI5351_PLL_RESET_A);
+	si5351_reg_write(drvdata, SI5351_PLL_RESET, mask);
+
+	err = regmap_read_poll_timeout(drvdata->regmap, SI5351_PLL_RESET, v,
+				 !(v & mask), 0, 20000);
+	if (err < 0)
+		dev_err(&drvdata->client->dev, "Reset bit didn't clear\n");
 
 	dev_dbg(&drvdata->client->dev, "%s - %s: pll = %d\n",
 		__func__, clk_hw_get_name(&drvdata->clkout[num].hw),