2013-07-25 20:07:19

by Jens Frederich

[permalink] [raw]
Subject: [PATCH] Staging: olpc_dcon: change to msleep to usleep_range

The resolution of msleep is related to HZ, so with HZ set to
100 any msleep of less then 10ms will become ~10ms. This is
not what we want. Use usleep_range to get more control of
what is happening here.

Signed-off-by: Jens Frederich <[email protected]>
---
drivers/staging/olpc_dcon/olpc_dcon.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/olpc_dcon/olpc_dcon.c b/drivers/staging/olpc_dcon/olpc_dcon.c
index 193e1c6..7c460f2 100644
--- a/drivers/staging/olpc_dcon/olpc_dcon.c
+++ b/drivers/staging/olpc_dcon/olpc_dcon.c
@@ -131,13 +131,13 @@ power_up:
pr_warn("unable to force dcon to power up: %d!\n", x);
return x;
}
- msleep(10); /* we'll be conservative */
+ usleep_range(10000, 11000); /* we'll be conservative */
}

pdata->bus_stabilize_wiggle();

for (x = -1, timeout = 50; timeout && x < 0; timeout--) {
- msleep(1);
+ usleep_range(1000, 1100);
x = dcon_read(dcon, DCON_REG_ID);
}
if (x < 0) {
--
1.7.9.5