linux-kernel - [PATCH v3 2/3] drm/sun4i: tcon: Support LVDS output on Allwinner A20

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Date:   Thu, 13 Feb 2020 22:18:55 +0200
From:   Andrey Lebedev <andrey.lebedev@...il.com>
To:     mripard@...nel.org, wens@...e.org, airlied@...ux.ie,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     linux-sunxi@...glegroups.com, Andrey Lebedev <andrey@...edev.lt>
Subject: [PATCH v3 2/3] drm/sun4i: tcon: Support LVDS output on Allwinner A20

From: Andrey Lebedev <andrey@...edev.lt>

A20 SoC (found in Cubieboard 2 among others) requires different LVDS set
up procedure than A33. Timing controller (tcon) driver only implements
sun6i-style procedure, that doesn't work on A20 (sun7i).

Signed-off-by: Andrey Lebedev <andrey@...edev.lt>
---
 drivers/gpu/drm/sun4i/sun4i_tcon.c | 26 ++++++++++++++++++++++++++
 drivers/gpu/drm/sun4i/sun4i_tcon.h | 11 +++++++++++
 2 files changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index cc6b05ca2c69..800a9bd86112 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -114,6 +114,30 @@ static void sun4i_tcon_channel_set_status(struct sun4i_tcon *tcon, int channel,
 	}
 }
 
+static void sun4i_tcon_setup_lvds_phy(struct sun4i_tcon *tcon,
+				      const struct drm_encoder *encoder)
+{
+	regmap_write(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
+		     SUN4I_TCON0_LVDS_ANA0_CK_EN |
+		     SUN4I_TCON0_LVDS_ANA0_REG_V |
+		     SUN4I_TCON0_LVDS_ANA0_REG_C |
+		     SUN4I_TCON0_LVDS_ANA0_EN_MB |
+		     SUN4I_TCON0_LVDS_ANA0_PD |
+		     SUN4I_TCON0_LVDS_ANA0_DCHS);
+
+	udelay(2); /* delay at least 1200 ns */
+	regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA1_REG,
+			   SUN4I_TCON0_LVDS_ANA1_INIT,
+			   SUN4I_TCON0_LVDS_ANA1_INIT);
+	udelay(1); /* delay at least 120 ns */
+	regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA1_REG,
+			   SUN4I_TCON0_LVDS_ANA1_UPDATE,
+			   SUN4I_TCON0_LVDS_ANA1_UPDATE);
+	regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
+			   SUN4I_TCON0_LVDS_ANA0_EN_MB,
+			   SUN4I_TCON0_LVDS_ANA0_EN_MB);
+}
+
 static void sun6i_tcon_setup_lvds_phy(struct sun4i_tcon *tcon,
 				      const struct drm_encoder *encoder)
 {
@@ -1456,11 +1480,13 @@ static const struct sun4i_tcon_quirks sun6i_a31s_quirks = {
 };
 
 static const struct sun4i_tcon_quirks sun7i_a20_quirks = {
+	.supports_lvds		= true,
 	.has_channel_0		= true,
 	.has_channel_1		= true,
 	.dclk_min_div		= 4,
 	/* Same display pipeline structure as A10 */
 	.set_mux		= sun4i_a10_tcon_set_mux,
+	.setup_lvds_phy		= sun4i_tcon_setup_lvds_phy,
 };
 
 static const struct sun4i_tcon_quirks sun8i_a33_quirks = {
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h
index 2974e59ef9f2..cfbf4e6c1679 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.h
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h
@@ -193,6 +193,13 @@
 #define SUN4I_TCON_MUX_CTRL_REG			0x200
 
 #define SUN4I_TCON0_LVDS_ANA0_REG		0x220
+#define SUN4I_TCON0_LVDS_ANA0_DCHS			BIT(16)
+#define SUN4I_TCON0_LVDS_ANA0_PD			(BIT(20) | BIT(21))
+#define SUN4I_TCON0_LVDS_ANA0_EN_MB			BIT(22)
+#define SUN4I_TCON0_LVDS_ANA0_REG_C			(BIT(24) | BIT(25))
+#define SUN4I_TCON0_LVDS_ANA0_REG_V			(BIT(26) | BIT(27))
+#define SUN4I_TCON0_LVDS_ANA0_CK_EN			(BIT(29) | BIT(28))
+
 #define SUN6I_TCON0_LVDS_ANA0_EN_MB			BIT(31)
 #define SUN6I_TCON0_LVDS_ANA0_EN_LDO			BIT(30)
 #define SUN6I_TCON0_LVDS_ANA0_EN_DRVC			BIT(24)
@@ -201,6 +208,10 @@
 #define SUN6I_TCON0_LVDS_ANA0_V(x)			(((x) & 3) << 8)
 #define SUN6I_TCON0_LVDS_ANA0_PD(x)			(((x) & 3) << 4)
 
+#define SUN4I_TCON0_LVDS_ANA1_REG		0x224
+#define SUN4I_TCON0_LVDS_ANA1_INIT			(0x1f << 26 | 0x1f << 10)
+#define SUN4I_TCON0_LVDS_ANA1_UPDATE			(0x1f << 16 | 0x1f << 00)
+
 #define SUN4I_TCON1_FILL_CTL_REG		0x300
 #define SUN4I_TCON1_FILL_BEG0_REG		0x304
 #define SUN4I_TCON1_FILL_END0_REG		0x308
-- 
2.20.1