github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-04 12:35:52 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/rockchip: vop2: Avoid use regmap_reinit_cache at runtime

Browse Source 
Marek Report a possible irq lock inversion dependency warning when
commit 81a06f1d02 ("Revert "drm/rockchip: vop2: Use regcache_sync()
to fix suspend/resume"") lands linux-next.

I can reproduce this warning with:
CONFIG_PROVE_LOCKING=y
CONFIG_DEBUG_LOCKDEP=y

It seems than when use regmap_reinit_cache at runtime whith Mark's
commit 3d59c22bbb ("drm/rockchip: vop2: Convert to use maple tree
register cache"), it will trigger a possible irq lock inversion dependency
warning.

One solution is switch back to REGCACHE_RBTREE, but it seems that
REGCACHE_MAPLE is the future, so I avoid using regmap_reinit_cache,
and drop all the regcache when vop is disabled, then we get a fresh
start at next enbable time.

Fixes: 81a06f1d02 ("Revert "drm/rockchip: vop2: Use regcache_sync() to fix suspend/resume"")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Closes: https://lore.kernel.org/all/98a9f15d-30ac-47bf-9b93-3aa2c9900f7b@samsung.com/
Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
[dropped the large kernel log of the lockdep report from the message]
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20231217084415.2373043-1-andyshrk@163.com
This commit is contained in:
Andy Yan 2023-12-17 16:44:15 +08:00 committed by Heiko Stuebner
parent 971740a4c3
commit 3ee348eb36
1 changed files with 2 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
View File

@ -959,12 +959,6 @@ static void vop2_enable(struct vop2 *vop2)
return;
}
ret = regmap_reinit_cache(vop2->map, &vop2_regmap_config);
if (ret) {
drm_err(vop2->drm, "failed to reinit cache: %d\n", ret);
return;
}
if (vop2->data->soc_id == 3566)
vop2_writel(vop2, RK3568_OTP_WIN_EN, 1);
@ -996,6 +990,8 @@ static void vop2_disable(struct vop2 *vop2)
pm_runtime_put_sync(vop2->dev);
regcache_drop_region(vop2->map, 0, vop2_regmap_config.max_register);
clk_disable_unprepare(vop2->pclk);
clk_disable_unprepare(vop2->aclk);
clk_disable_unprepare(vop2->hclk);