linux-kernel - [PATCH] drm/msm/mdp4: Remove redundant null check before clk_prepare_enable/clk_disable

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Date:   Thu, 31 Dec 2020 09:41:55 +0000
From:   Xu Wang <vulab@...as.ac.cn>
To:     robdclark@...il.com, sean@...rly.run, airlied@...ux.ie,
        daniel@...ll.ch, jcrouse@...eaurora.org, tzimmermann@...e.de,
        sam@...nborg.org
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/msm/mdp4: Remove redundant null check before clk_prepare_enable/clk_disable_unprepare

Because clk_prepare_enable() and clk_disable_unprepare() already checked
NULL clock parameter, so the additional checks are unnecessary, just
remove them.

Signed-off-by: Xu Wang <vulab@...as.ac.cn>
---
 drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
index 3d729270bde1..696a22d571ad 100644
--- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
@@ -207,12 +207,9 @@ int mdp4_disable(struct mdp4_kms *mdp4_kms)
 	DBG("");
 
 	clk_disable_unprepare(mdp4_kms->clk);
-	if (mdp4_kms->pclk)
-		clk_disable_unprepare(mdp4_kms->pclk);
-	if (mdp4_kms->lut_clk)
-		clk_disable_unprepare(mdp4_kms->lut_clk);
-	if (mdp4_kms->axi_clk)
-		clk_disable_unprepare(mdp4_kms->axi_clk);
+	clk_disable_unprepare(mdp4_kms->pclk);
+	clk_disable_unprepare(mdp4_kms->lut_clk);
+	clk_disable_unprepare(mdp4_kms->axi_clk);
 
 	return 0;
 }
@@ -222,12 +219,9 @@ int mdp4_enable(struct mdp4_kms *mdp4_kms)
 	DBG("");
 
 	clk_prepare_enable(mdp4_kms->clk);
-	if (mdp4_kms->pclk)
-		clk_prepare_enable(mdp4_kms->pclk);
-	if (mdp4_kms->lut_clk)
-		clk_prepare_enable(mdp4_kms->lut_clk);
-	if (mdp4_kms->axi_clk)
-		clk_prepare_enable(mdp4_kms->axi_clk);
+	clk_prepare_enable(mdp4_kms->pclk);
+	clk_prepare_enable(mdp4_kms->lut_clk);
+	clk_prepare_enable(mdp4_kms->axi_clk);
 
 	return 0;
 }
-- 
2.17.1