linux-kernel - [PATCH v3 11/28] drm/sun4i: Disable unused DE2 sub-engines

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Date:   Sun,  4 Nov 2018 19:26:48 +0100
From:   Jernej Skrabec <jernej.skrabec@...l.net>
To:     maxime.ripard@...tlin.com, wens@...e.org
Cc:     robh+dt@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        airlied@...ux.ie, architt@...eaurora.org, a.hajda@...sung.com,
        Laurent.pinchart@...asonboard.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-sunxi@...glegroups.com, jernej.skrabec@...l.net
Subject: [PATCH v3 11/28] drm/sun4i: Disable unused DE2 sub-engines

Some sub-engines are unused. Disable them explicitly.

Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
---
 drivers/gpu/drm/sun4i/sun8i_mixer.c | 8 ++++++++
 drivers/gpu/drm/sun4i/sun8i_mixer.h | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
index 6769ec08c0d3..ec2c264f9481 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
@@ -462,6 +462,14 @@ static int sun8i_mixer_bind(struct device *dev, struct device *master,
 	/* Reset the registers */
 	for (i = 0; i < DE2_MIXER_UNIT_SIZE; i += 4)
 		regmap_write(mixer->engine.regs, i, 0);
+	/* Disable unused sub-engines */
+	regmap_write(mixer->engine.regs, SUN8I_MIXER_FCE_EN, 0);
+	regmap_write(mixer->engine.regs, SUN8I_MIXER_BWS_EN, 0);
+	regmap_write(mixer->engine.regs, SUN8I_MIXER_LTI_EN, 0);
+	regmap_write(mixer->engine.regs, SUN8I_MIXER_PEAK_EN, 0);
+	regmap_write(mixer->engine.regs, SUN8I_MIXER_ASE_EN, 0);
+	regmap_write(mixer->engine.regs, SUN8I_MIXER_FCC_EN, 0);
+	regmap_write(mixer->engine.regs, SUN8I_MIXER_DCSC_EN, 0);
 
 	/* Enable the mixer */
 	regmap_write(mixer->engine.regs, SUN8I_MIXER_GLOBAL_CTL,
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
index 09e0f4428c1e..a4175b993e0d 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
@@ -101,8 +101,8 @@
 #define SUN8I_MIXER_FBFMT_YUV411	14
 
 /*
- * These sub-engines are still unknown now, the EN registers are here only to
- * be used to disable these sub-engines.
+ * Sub-engines listed bellow are unused for now. The EN registers are here only
+ * to be used to disable these sub-engines.
  */
 #define SUN8I_MIXER_FCE_EN			0xa0000
 #define SUN8I_MIXER_BWS_EN			0xa2000
-- 
2.19.1