Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1552832

[PATCH v2 3/4] mfd: arizona: Update arizona_poll_reg to take a timeout in milliseconds

Show all headers | View raw

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.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---

Changes since v1:
 - Fixed small typo of missing * 1000

Thanks,
Charles

 drivers/mfd/arizona-core.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 4cb34c3..ae4cdc4 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -235,14 +235,18 @@ static irqreturn_t arizona_overclocked(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+#define ARIZONA_REG_POLL_DELAY_MS 5
+
 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 npolls = (timeout_ms + ARIZONA_REG_POLL_DELAY_MS - 1) /
+			      ARIZONA_REG_POLL_DELAY_MS;
 	unsigned int val = 0;
 	int ret, i;
 
-	for (i = 0; i < timeout; i++) {
+	for (i = 0; i < npolls; i++) {
 		ret = regmap_read(arizona->regmap, reg, &val);
 		if (ret != 0) {
 			dev_err(arizona->dev, "Failed to read reg 0x%x: %d\n",
@@ -253,7 +257,8 @@ static int arizona_poll_reg(struct arizona *arizona,
 		if ((val & mask) == target)
 			return 0;
 
-		usleep_range(1000, 5000);
+		usleep_range((ARIZONA_REG_POLL_DELAY_MS * 1000) / 2,
+			     ARIZONA_REG_POLL_DELAY_MS * 1000);
 	}
 
 	dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n", reg, val);
@@ -269,7 +274,7 @@ 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, 25, ARIZONA_INTERRUPT_RAW_STATUS_5,
 			       ARIZONA_BOOT_DONE_STS, ARIZONA_BOOT_DONE_STS);
 
 	if (!ret)
@@ -339,7 +344,7 @@ 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, 125, ARIZONA_INTERRUPT_RAW_STATUS_5,
 			       ARIZONA_FLL1_CLOCK_OK_STS,
 			       ARIZONA_FLL1_CLOCK_OK_STS);
 	if (ret)
@@ -403,7 +408,7 @@ 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, 25, ARIZONA_WRITE_SEQUENCER_CTRL_1,
 			       ARIZONA_WSEQ_BUSY, 0);
 	if (ret)
 		regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,
-- 
2.1.4

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

[PATCH v2 3/4] mfd: arizona: Update arizona_poll_reg to take a timeout in milliseconds Charles Keepax <ckeepax@opensource.wolfsonmicro.com> - 2017-01-06 15:30 +0100

csiph-web