From: Rajesh Yadav <ryadav@codeaurora.org>
Date: Mon, 25 Jun 2018 19:12:03 +0530
Subject: drm/msm/dsi: initialize postdiv_lock before use for 10nm pll
Git-commit: 7a296796fd0b28dc229d65dd90a6b392852d9631
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

postdiv_lock spinlock was used before initialization
for 10nm pll. It causes following spin_bug:
	"BUG: spinlock bad magic on CPU#0".
Initialize spinlock before its usage.

Changes in v3:
- Added Archit's R-b

Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rajesh Yadav <ryadav@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c
+++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c
@@ -798,6 +798,8 @@ struct msm_dsi_pll *msm_dsi_pll_10nm_ini
 		return ERR_PTR(-ENOMEM);
 	}
 
+	spin_lock_init(&pll_10nm->postdiv_lock);
+
 	pll = &pll_10nm->base;
 	pll->min_rate = 1000000000UL;
 	pll->max_rate = 3500000000UL;