drm/sun4i: tcon: Move SoC specific quirks to a DT matched data structure

commit 91ea2f29cba6a7fe035ea232e4f981211a9fce5d upstream.

We already have some differences between the 2 supported SoCs.
More will be added as we support other SoCs. To avoid bloating
the probe function with even more conditionals, move the quirks
to a separate data structure that's tied to the compatible string.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 25 insertions, 19 deletions

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index cadacb517f95..7658f0337e0b 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -20,6 +20,7 @@
 #include <linux/component.h>
 #include <linux/ioport.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
 #include <linux/of_graph.h>
 #include <linux/of_irq.h>
 #include <linux/regmap.h>
@@ -62,7 +63,7 @@ void sun4i_tcon_channel_disable(struct sun4i_tcon *tcon, int channel)
                 return;
         }
 
-        WARN_ON(!tcon->has_channel_1);
+        WARN_ON(!tcon->quirks->has_channel_1);
         regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
                            SUN4I_TCON1_CTL_TCON_ENABLE, 0);
         clk_disable_unprepare(tcon->sclk1);
@@ -80,7 +81,7 @@ void sun4i_tcon_channel_enable(struct sun4i_tcon *tcon, int channel)
                 return;
         }
 
-        WARN_ON(!tcon->has_channel_1);
+        WARN_ON(!tcon->quirks->has_channel_1);
         regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
                            SUN4I_TCON1_CTL_TCON_ENABLE,
                            SUN4I_TCON1_CTL_TCON_ENABLE);
@@ -202,7 +203,7 @@ void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
         u8 clk_delay;
         u32 val;
 
-        WARN_ON(!tcon->has_channel_1);
+        WARN_ON(!tcon->quirks->has_channel_1);
 
         /* Adjust clock delay */
         clk_delay = sun4i_tcon_get_clk_delay(mode, 1);
@@ -266,7 +267,7 @@ void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
         /*
          * FIXME: Undocumented bits
          */
-        if (tcon->has_mux)
+        if (tcon->quirks->has_unknown_mux)
                 regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, 1);
 }
 EXPORT_SYMBOL(sun4i_tcon1_mode_set);
@@ -327,7 +328,7 @@ static int sun4i_tcon_init_clocks(struct device *dev,
                 return PTR_ERR(tcon->sclk0);
         }
 
-        if (tcon->has_channel_1) {
+        if (tcon->quirks->has_channel_1) {
                 tcon->sclk1 = devm_clk_get(dev, "tcon-ch1");
                 if (IS_ERR(tcon->sclk1)) {
                         dev_err(dev, "Couldn't get the TCON channel 1 clock\n");
@@ -487,14 +488,7 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master,
         drv->tcon = tcon;
         tcon->drm = drm;
         tcon->dev = dev;
-
-        if (of_device_is_compatible(dev->of_node, "allwinner,sun5i-a13-tcon")) {
-                tcon->has_mux = true;
-                tcon->has_channel_1 = true;
-        } else {
-                tcon->has_mux = false;
-                tcon->has_channel_1 = false;
-        }
+        tcon->quirks = of_device_get_match_data(dev);
 
         tcon->lcd_rst = devm_reset_control_get(dev, "lcd");
         if (IS_ERR(tcon->lcd_rst)) {
@@ -588,9 +582,18 @@ static int sun4i_tcon_remove(struct platform_device *pdev)
         return 0;
 }
 
+static const struct sun4i_tcon_quirks sun5i_a13_quirks = {
+        .has_unknown_mux = true,
+        .has_channel_1  = true,
+};
+
+static const struct sun4i_tcon_quirks sun8i_a33_quirks = {
+        /* nothing is supported */
+};
+
 static const struct of_device_id sun4i_tcon_of_table[] = {
-        { .compatible = "allwinner,sun5i-a13-tcon" },
-        { .compatible = "allwinner,sun8i-a33-tcon" },
+        { .compatible = "allwinner,sun5i-a13-tcon", .data = &sun5i_a13_quirks },
+        { .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks },
         { }
 };
 MODULE_DEVICE_TABLE(of, sun4i_tcon_of_table);
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h
index 12bd48925f4d..166064bafe2e 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.h
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h
@@ -142,6 +142,11 @@
 
 #define SUN4I_TCON_MAX_CHANNELS         2
 
+struct sun4i_tcon_quirks {
+        bool    has_unknown_mux; /* sun5i has undocumented mux */
+        bool    has_channel_1;  /* a33 does not have channel 1 */
+};
+
 struct sun4i_tcon {
         struct device                   *dev;
         struct drm_device               *drm;
@@ -160,12 +165,10 @@ struct sun4i_tcon {
         /* Reset control */
         struct reset_control            *lcd_rst;
 
-        /* Platform adjustments */
-        bool                            has_mux;
-
         struct drm_panel                *panel;
 
-        bool                            has_channel_1;
+        /* Platform adjustments */
+        const struct sun4i_tcon_quirks  *quirks;
 };
 
 struct drm_bridge *sun4i_tcon_find_bridge(struct device_node *node);