[PATCH 1/9] drm/bridge: tc358767: Simplify tc_poll_timeout()

[Andrey Smirnov <andrew.smirnov@gmail.com>]

Implementation of tc_poll_timeout() is almost a 100% copy-and-paste of
the code for regmap_read_poll_timeout(). Replace copied code with a
call to the original. No functional change intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/gpu/drm/bridge/tc358767.c | 19 +++----------------
 1 file changed, 3 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index e6403b9549f1..b0f8264a1285 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -252,24 +252,11 @@ static inline int tc_poll_timeout(struct regmap *map, unsigned int addr,
 				  unsigned int cond_value,
 				  unsigned long sleep_us, u64 timeout_us)
 {
-	ktime_t timeout = ktime_add_us(ktime_get(), timeout_us);
 	unsigned int val;
-	int ret;
 
-	for (;;) {
-		ret = regmap_read(map, addr, &val);
-		if (ret)
-			break;
-		if ((val & cond_mask) == cond_value)
-			break;
-		if (timeout_us && ktime_compare(ktime_get(), timeout) > 0) {
-			ret = regmap_read(map, addr, &val);
-			break;
-		}
-		if (sleep_us)
-			usleep_range((sleep_us >> 2) + 1, sleep_us);
-	}
-	return ret ?: (((val & cond_mask) == cond_value) ? 0 : -ETIMEDOUT);
+	return regmap_read_poll_timeout(map, addr, val,
+					(val & cond_mask) == cond_value,
+					sleep_us, timeout_us);
 }
 
 static int tc_aux_wait_busy(struct tc_data *tc, unsigned int timeout_ms)
-- 
2.20.1