From: Shawn Guo <shawn.guo@linaro.org>
Date: Thu, 6 Apr 2017 23:01:07 +0800
Subject: drm: zte: do not enable clock auto-gating by default
Git-commit: 893898f583f0ce4415e1b74399a14632c43a7bbe
Patch-mainline: v4.13-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Some VOU modules do not work well with clock auto-gating.  For example,
VGA I2C bus will fail to read EDID data from monitor.  Let's not enable
this feature by default, and leave it to the possible future low-power
optimization.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1491490870-6330-2-git-send-email-shawnguo@kernel.org

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/zte/zx_vou.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/drivers/gpu/drm/zte/zx_vou.c
+++ b/drivers/gpu/drm/zte/zx_vou.c
@@ -705,9 +705,6 @@ static void vou_hw_init(struct zx_vou_hw
 	/* Release reset for all VOU modules */
 	zx_writel(vou->vouctl + VOU_SOFT_RST, ~0);
 
-	/* Enable clock auto-gating for all VOU modules */
-	zx_writel(vou->vouctl + VOU_CLK_REQEN, ~0);
-
 	/* Enable all VOU module clocks */
 	zx_writel(vou->vouctl + VOU_CLK_EN, ~0);