lkml.org 
[lkml]   [2018]   [Aug]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] gpu: drm: radeon: r100: Replace mdelay() with msleep() and usleep_range() in r100_asic_reset()
Date
r100_asic_reset() is never called in atomic context.
It calls mdelay() to busily wait, which is not necessary.
mdelay() can be replaced with msleep() and usleep_range().

This is found by a static analysis tool named DCNS written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
---
drivers/gpu/drm/radeon/r100.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index 7d39ed63e5be..09c418113d9a 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -2576,17 +2576,17 @@ int r100_asic_reset(struct radeon_device *rdev, bool hard)
S_0000F0_SOFT_RESET_PP(1) |
S_0000F0_SOFT_RESET_RB(1));
RREG32(R_0000F0_RBBM_SOFT_RESET);
- mdelay(500);
+ msleep(500);
WREG32(R_0000F0_RBBM_SOFT_RESET, 0);
- mdelay(1);
+ usleep_range(1000, 2000);
status = RREG32(R_000E40_RBBM_STATUS);
dev_info(rdev->dev, "(%s:%d) RBBM_STATUS=0x%08X\n", __func__, __LINE__, status);
/* reset CP */
WREG32(R_0000F0_RBBM_SOFT_RESET, S_0000F0_SOFT_RESET_CP(1));
RREG32(R_0000F0_RBBM_SOFT_RESET);
- mdelay(500);
+ msleep(500);
WREG32(R_0000F0_RBBM_SOFT_RESET, 0);
- mdelay(1);
+ usleep_range(1000, 2000);
status = RREG32(R_000E40_RBBM_STATUS);
dev_info(rdev->dev, "(%s:%d) RBBM_STATUS=0x%08X\n", __func__, __LINE__, status);
/* restore PCI & busmastering */
--
2.17.0
\
 
 \ /
  Last update: 2018-08-04 02:19    [W:0.026 / U:8.104 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site