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authorCharles Keepax <ckeepax@opensource.wolfsonmicro.com>2017-03-15 17:58:38 +0300
committerLee Jones <lee.jones@linaro.org>2017-04-27 11:25:05 +0300
commitef84f885e03763c963dbb5d36389d33ce50576f2 (patch)
treef4891816b188bdd4d5d479f2920654340b014b62 /drivers/mfd
parentf9657b8f75473ce0488c750677bfef46751dd5e1 (diff)
downloadlinux-ef84f885e03763c963dbb5d36389d33ce50576f2.tar.xz
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>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/arizona-core.c36
1 files changed, 16 insertions, 20 deletions
diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 4cb34c36a0e5..75488e65cd96 100644
--- 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,