linux-kernel - [RFC 4/4] drm/sun4i: Update mixer's internal registers after initialization

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Date:   Sat, 28 Dec 2019 22:28:18 +0200
From:   roman.stratiienko@...ballogic.com
To:     mripard@...nel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        jernej.skrabec@...l.net
Cc:     Roman Stratiienko <roman.stratiienko@...ballogic.com>
Subject: [RFC 4/4] drm/sun4i: Update mixer's internal registers after initialization

From: Roman Stratiienko <roman.stratiienko@...ballogic.com>

At system start blink of u-boot ghost framebuffer can be observed.
Fix it.

Signed-off-by: Roman Stratiienko <roman.stratiienko@...ballogic.com>
---
 drivers/gpu/drm/sun4i/sun8i_mixer.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
index da84fccf7784..b906b8cc464e 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
@@ -588,6 +588,9 @@ static int sun8i_mixer_bind(struct device *dev, struct device *master,
 	regmap_update_bits(mixer->engine.regs, SUN8I_MIXER_BLEND_PIPE_CTL(base),
 			   SUN8I_MIXER_BLEND_PIPE_CTL_EN_MSK, 0);
 
+	regmap_write(mixer->engine.regs, SUN8I_MIXER_GLOBAL_DBUFF,
+		     SUN8I_MIXER_GLOBAL_DBUFF_ENABLE);
+
 	return 0;
 
 err_disable_bus_clk:
-- 
2.17.1