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| author |   Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-04-24 18:11:21 +0200 |
|---|---|---|
| committer |   Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2018-04-24 18:11:21 +0200 |
| commit | de11731278712e0f8b12a2539aa2958ca95200c3 (patch) | |
| tree | e7de080557302d3807ad18c79a031f5a15c17226 /drivers/video | |
| parent | video: fbdev: aty: aty128fb: Replace mdelay with msleep in aty128_set_suspend (diff) | |
| download | linux-dev-de11731278712e0f8b12a2539aa2958ca95200c3.tar.xz linux-dev-de11731278712e0f8b12a2539aa2958ca95200c3.zip | |
video: fbdev: aty: radeon_pm: Replace mdelay with msleep in radeonfb_pci_suspend
radeonfb_pci_suspend() is never called in atomic context.
radeonfb_pci_suspend() is only set as ".suspend" in struct pci_driver.
This function is not called in atomic context.
Despite never getting called from atomic context, radeonfb_pci_suspend()
calls mdelay() to busily wait.
This is not necessary and can be replaced with msleep()
and usleep_range() to avoid busy waiting.
This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/aty/radeon_pm.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/video/fbdev/aty/radeon_pm.c b/drivers/video/fbdev/aty/radeon_pm.c index 7137c12cbcee..e695adb0e573 100644 --- a/drivers/video/fbdev/aty/radeon_pm.c +++ b/drivers/video/fbdev/aty/radeon_pm.c @@ -2678,17 +2678,17 @@ int radeonfb_pci_suspend(struct pci_dev *pdev, pm_message_t mesg) * it, we'll restore the dynamic clocks state on wakeup */ radeon_pm_disable_dynamic_mode(rinfo); - mdelay(50); + msleep(50); radeon_pm_save_regs(rinfo, 1); if (rinfo->is_mobility && !(rinfo->pm_mode & radeon_pm_d2)) { /* Switch off LVDS interface */ - mdelay(1); + usleep_range(1000, 2000); OUTREG(LVDS_GEN_CNTL, INREG(LVDS_GEN_CNTL) & ~(LVDS_BL_MOD_EN)); - mdelay(1); + usleep_range(1000, 2000); OUTREG(LVDS_GEN_CNTL, INREG(LVDS_GEN_CNTL) & ~(LVDS_EN | LVDS_ON)); OUTREG(LVDS_PLL_CNTL, (INREG(LVDS_PLL_CNTL) & ~30000) | 0x20000); - mdelay(20); + msleep(20); OUTREG(LVDS_GEN_CNTL, INREG(LVDS_GEN_CNTL) & ~(LVDS_DIGON)); } pci_disable_device(pdev); |