[PATCH v6 04/22] drm/sun4i: sun6i_mipi_dsi: Simplify drq to support all modes

[Jagan Teki <jagan@amarulasolutions.com>]

Allwinner MIPI DSI drq has enable mode and set bits.
- for burst mode, drq need to set enable mode bit.
- for non-burst video modes, drq need to set enable mode,
  set bits for those front proch greater than 20 and for
  rest drq is not used.

This patch simplifies existing drq code by grouping into
sun6i_dsi_get_drq and support all video modes.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 39 ++++++++++++++++----------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 0f02bcc997a5..16a86d35dc5a 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -354,6 +354,28 @@ static void sun6i_dsi_inst_init(struct sun6i_dsi *dsi,
 		     SUN6I_DSI_INST_JUMP_CFG_NUM(1));
 };
 
+static int sun6i_dsi_get_drq(struct sun6i_dsi *dsi,
+			      struct drm_display_mode *mode)
+{
+	struct mipi_dsi_device *device = dsi->device;
+
+	if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
+		return SUN6I_DSI_TCON_DRQ_ENABLE_MODE;
+
+	if ((mode->hsync_start - mode->hdisplay) > 20) {
+		/* Maaaaaagic */
+		u16 drq = (mode->hsync_start - mode->hdisplay) - 20;
+
+		drq *= mipi_dsi_pixel_format_to_bpp(device->format);
+		drq /= 32;
+
+		return (SUN6I_DSI_TCON_DRQ_ENABLE_MODE |
+			SUN6I_DSI_TCON_DRQ_SET(drq));
+	}
+
+	return 0;
+}
+
 static u16 sun6i_dsi_setup_inst_delay(struct sun6i_dsi *dsi,
 				      struct drm_display_mode *mode)
 {
@@ -381,21 +403,8 @@ static u16 sun6i_dsi_get_video_start_delay(struct sun6i_dsi *dsi,
 static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
 				  struct drm_display_mode *mode)
 {
-	struct mipi_dsi_device *device = dsi->device;
-	u32 val = 0;
-
-	if ((mode->hsync_end - mode->hdisplay) > 20) {
-		/* Maaaaaagic */
-		u16 drq = (mode->hsync_end - mode->hdisplay) - 20;
-
-		drq *= mipi_dsi_pixel_format_to_bpp(device->format);
-		drq /= 32;
-
-		val = (SUN6I_DSI_TCON_DRQ_ENABLE_MODE |
-		       SUN6I_DSI_TCON_DRQ_SET(drq));
-	}
-
-	regmap_write(dsi->regs, SUN6I_DSI_TCON_DRQ_REG, val);
+	regmap_write(dsi->regs, SUN6I_DSI_TCON_DRQ_REG,
+		     sun6i_dsi_get_drq(dsi, mode));
 }
 
 static void sun6i_dsi_setup_inst_loop(struct sun6i_dsi *dsi,
-- 
2.18.0.321.gffc6fa0e3