[v2,1/4] drm: zte: do not enable clock auto-gating by default
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Message ID 1491490870-6330-2-git-send-email-shawnguo@kernel.org
State New
Headers show

Commit Message

Shawn Guo April 6, 2017, 3:01 p.m. UTC
From: Shawn Guo <shawn.guo@linaro.org>

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>
---
 drivers/gpu/drm/zte/zx_vou.c | 3 ---
 1 file changed, 3 deletions(-)

Patch
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diff --git a/drivers/gpu/drm/zte/zx_vou.c b/drivers/gpu/drm/zte/zx_vou.c
index cf92d675feaa..2a2d90bd9425 100644
--- a/drivers/gpu/drm/zte/zx_vou.c
+++ b/drivers/gpu/drm/zte/zx_vou.c
@@ -720,9 +720,6 @@  static void vou_hw_init(struct zx_vou_hw *vou)
 	/* 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);