drm: zte: do not enable clock auto-gating by default
authorShawn Guo <shawn.guo@linaro.org>
Thu, 6 Apr 2017 15:01:07 +0000 (23:01 +0800)
committerShawn Guo <shawn.guo@linaro.org>
Thu, 4 May 2017 05:50:34 +0000 (13:50 +0800)
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
drivers/gpu/drm/zte/zx_vou.c

index b500c8d..5145215 100644 (file)
@@ -705,9 +705,6 @@ 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);