backlight: ld9040: use sleep instead of delay

Replace mdelay with msleep to remove the busy loop waiting.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/video/backlight/ld9040.c b/drivers/video/backlight/ld9040.c
index 1cb352418513..a52a6a7e572e 100644
--- a/drivers/video/backlight/ld9040.c
+++ b/drivers/video/backlight/ld9040.c
@@ -78,7 +78,7 @@ static void ld9040_regulator_enable(struct ld9040 *lcd)
 
                 lcd->enabled = true;
         }
-        mdelay(pd->power_on_delay);
+        msleep(pd->power_on_delay);
 out:
         mutex_unlock(&lcd->lock);
 }
@@ -474,8 +474,9 @@ static int ld9040_panel_send_sequence(struct ld9040 *lcd,
                         ret = ld9040_spi_write(lcd, wbuf[i], wbuf[i+1]);
                         if (ret)
                                 break;
-                } else
-                        udelay(wbuf[i+1]*1000);
+                } else {
+                        msleep(wbuf[i+1]);
+                }
                 i += 2;
         }
 
@@ -539,7 +540,7 @@ static int ld9040_ldi_init(struct ld9040 *lcd)
         for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
                 ret = ld9040_panel_send_sequence(lcd, init_seq[i]);
                 /* workaround: minimum delay time for transferring CMD */
-                udelay(300);
+                usleep_range(300, 310);
                 if (ret)
                         break;
         }
@@ -584,7 +585,7 @@ static int ld9040_power_on(struct ld9040 *lcd)
                 return -EFAULT;
         } else {
                 pd->reset(lcd->ld);
-                mdelay(pd->reset_delay);
+                msleep(pd->reset_delay);
         }
 
         ret = ld9040_ldi_init(lcd);
@@ -619,7 +620,7 @@ static int ld9040_power_off(struct ld9040 *lcd)
                 return -EIO;
         }
 
-        mdelay(pd->power_off_delay);
+        msleep(pd->power_off_delay);
 
         /* lcd power off */
         ld9040_regulator_disable(lcd);