drm/sun4i: tcon: Add TRI finish interrupt for vblank

The "CPU" (or Intel 8080) interface uses a different interrupt called
TRI_FINISH (most likely TRI being for trigger) to notify the end of frames,
and hence the VBLANK period.

And that interrupt to the possible VBLANK interrupts source.

Reviewed-by: Chen-Yu Tsai <[e-mail]>
Signed-off-by: Maxime Ripard <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/de6d6ad8959d[e-mail]

drivers/gpu/drm/sun4i/sun4i_tcon.c

···
 	DRM_DEBUG_DRIVER("%sabling VBLANK interrupt\n", enable ? "En" : "Dis");
 
 	mask = SUN4I_TCON_GINT0_VBLANK_ENABLE(0) |
-	       SUN4I_TCON_GINT0_VBLANK_ENABLE(1);
+		SUN4I_TCON_GINT0_VBLANK_ENABLE(1) |
+		SUN4I_TCON_GINT0_TCON0_TRI_FINISH_ENABLE;
 
 	if (enable)
 		val = mask;
···
 	regmap_read(tcon->regs, SUN4I_TCON_GINT0_REG, &status);
 
 	if (!(status & (SUN4I_TCON_GINT0_VBLANK_INT(0) |
-			SUN4I_TCON_GINT0_VBLANK_INT(1))))
+			SUN4I_TCON_GINT0_VBLANK_INT(1) |
+			SUN4I_TCON_GINT0_TCON0_TRI_FINISH_INT)))
 		return IRQ_NONE;
 
 	drm_crtc_handle_vblank(&scrtc->crtc);
···
 	/* Acknowledge the interrupt */
 	regmap_update_bits(tcon->regs, SUN4I_TCON_GINT0_REG,
 			   SUN4I_TCON_GINT0_VBLANK_INT(0) |
-			   SUN4I_TCON_GINT0_VBLANK_INT(1),
+			   SUN4I_TCON_GINT0_VBLANK_INT(1) |
+			   SUN4I_TCON_GINT0_TCON0_TRI_FINISH_INT,
 			   0);
 
 	if (engine->ops->vblank_quirk)

drivers/gpu/drm/sun4i/sun4i_tcon.h

···
 
 #define SUN4I_TCON_GINT0_REG			0x4
 #define SUN4I_TCON_GINT0_VBLANK_ENABLE(pipe)		BIT(31 - (pipe))
+#define SUN4I_TCON_GINT0_TCON0_TRI_FINISH_ENABLE	BIT(27)
+#define SUN4I_TCON_GINT0_TCON0_TRI_COUNTER_ENABLE	BIT(26)
 #define SUN4I_TCON_GINT0_VBLANK_INT(pipe)		BIT(15 - (pipe))
+#define SUN4I_TCON_GINT0_TCON0_TRI_FINISH_INT		BIT(11)
+#define SUN4I_TCON_GINT0_TCON0_TRI_COUNTER_INT		BIT(10)
 
 #define SUN4I_TCON_GINT1_REG			0x8
 #define SUN4I_TCON_FRM_CTL_REG			0x10