mfd: arizona: Refactor arizona_poll_reg

Currently, we specify the timeout in terms of the number of polls but it
is more clear from a user of the functions perspective to specify the
timeout directly in milliseconds, as such update the function to these new
semantics.

Additionally, arizona_poll_reg essentially hard-codes
regmap_read_poll_timeout, update the implementation to use
regmap_read_poll_timeout. We still keep arizona_poll_reg around as
regmap_read_poll_timeout is a macro so rather than expand this for each
caller keep it wrapped in arizona_poll_reg.

Whilst we are doing this make the timeouts a little more generous as
the previous system had a bit more slack as it was done as a delay per
iteration of the loop whereas regmap_read_poll_timeout compares ktime's.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 4cb34c3..75488e6 100644 (file)
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -235,29 +235,25 @@ static irqreturn_t arizona_overclocked(int irq, void *data)
        return IRQ_HANDLED;
 }
 
+#define ARIZONA_REG_POLL_DELAY_US 7500
+
 static int arizona_poll_reg(struct arizona *arizona,
-                           int timeout, unsigned int reg,
+                           int timeout_ms, unsigned int reg,
                            unsigned int mask, unsigned int target)
 {
        unsigned int val = 0;
-       int ret, i;
-
-       for (i = 0; i < timeout; i++) {
-               ret = regmap_read(arizona->regmap, reg, &val);
-               if (ret != 0) {
-                       dev_err(arizona->dev, "Failed to read reg 0x%x: %d\n",
-                               reg, ret);
-                       continue;
-               }
-
-               if ((val & mask) == target)
-                       return 0;
+       int ret;
 
-               usleep_range(1000, 5000);
-       }
+       ret = regmap_read_poll_timeout(arizona->regmap,
+                                      ARIZONA_INTERRUPT_RAW_STATUS_5, val,
+                                      ((val & mask) == target),
+                                      ARIZONA_REG_POLL_DELAY_US,
+                                      timeout_ms * 1000);
+       if (ret)
+               dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n",
+                       reg, val);
 
-       dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n", reg, val);
-       return -ETIMEDOUT;
+       return ret;
 }
 
 static int arizona_wait_for_boot(struct arizona *arizona)
@@ -269,7 +265,7 @@ static int arizona_wait_for_boot(struct arizona *arizona)
         * we won't race with the interrupt handler as it'll be blocked on
         * runtime resume.
         */
-       ret = arizona_poll_reg(arizona, 5, ARIZONA_INTERRUPT_RAW_STATUS_5,
+       ret = arizona_poll_reg(arizona, 30, ARIZONA_INTERRUPT_RAW_STATUS_5,
                               ARIZONA_BOOT_DONE_STS, ARIZONA_BOOT_DONE_STS);
 
        if (!ret)
@@ -339,7 +335,7 @@ static int arizona_enable_freerun_sysclk(struct arizona *arizona,
                        ret);
                return ret;
        }
-       ret = arizona_poll_reg(arizona, 25, ARIZONA_INTERRUPT_RAW_STATUS_5,
+       ret = arizona_poll_reg(arizona, 180, ARIZONA_INTERRUPT_RAW_STATUS_5,
                               ARIZONA_FLL1_CLOCK_OK_STS,
                               ARIZONA_FLL1_CLOCK_OK_STS);
        if (ret)
@@ -403,7 +399,7 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona)
                goto err;
        }
 
-       ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1,
+       ret = arizona_poll_reg(arizona, 30, ARIZONA_WRITE_SEQUENCER_CTRL_1,
                               ARIZONA_WSEQ_BUSY, 0);
        if (ret)
                regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,