drm/sun4i: tcon: Support LVDS output on Allwinner A20

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@lebedev.lt>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200219180858.4806-6-andrey.lebedev@gmail.com

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 2d55ca4..df8bd30 100644 (file)
--- 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)
 {
@@ -1454,6 +1478,16 @@ static const struct sun4i_tcon_quirks sun6i_a31s_quirks = {
        .dclk_min_div           = 1,
 };
 
+static const struct sun4i_tcon_quirks sun7i_a20_tcon0_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 sun7i_a20_quirks = {
        .has_channel_0          = true,
        .has_channel_1          = true,
@@ -1508,7 +1542,7 @@ const struct of_device_id sun4i_tcon_of_table[] = {
        { .compatible = "allwinner,sun6i-a31-tcon", .data = &sun6i_a31_quirks },
        { .compatible = "allwinner,sun6i-a31s-tcon", .data = &sun6i_a31s_quirks },
        { .compatible = "allwinner,sun7i-a20-tcon", .data = &sun7i_a20_quirks },
-       { .compatible = "allwinner,sun7i-a20-tcon0", .data = &sun7i_a20_quirks },
+       { .compatible = "allwinner,sun7i-a20-tcon0", .data = &sun7i_a20_tcon0_quirks },
        { .compatible = "allwinner,sun7i-a20-tcon1", .data = &sun7i_a20_quirks },
        { .compatible = "allwinner,sun8i-a23-tcon", .data = &sun8i_a33_quirks },
        { .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks },

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h
index 2974e59..cfbf4e6 100644 (file)
--- 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