[PATCH v8 05/10] drm/sun4i: sun6i_mipi_dsi: Simplify drq to support all modes

[Jagan Teki <jagan@amarulasolutions.com>]

Allwinner MIPI DSI drq has enable mode bit and set bits.
1) drq for non-burst, with front porch less than 20 would need to
   set both enable mode bit and set bits.
2) drq for non-burst, with front porch greater or equal to 20 would
   not require to do any drq bit setup.
3) drq for burst mode, would only need to set enable mode bit.

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>
Tested-by: Merlijn Wajer <merlijn@wizzup.org>
---
 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 a4360aed17bf..ab95e2a873b5 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -355,6 +355,28 @@ 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)
 {
@@ -399,21 +421,8 @@ 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_start - mode->hdisplay) > 20) {
-		/* Maaaaaagic */
-		u16 drq = (mode->hsync_start - 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