drm/sun4i: tcon: Fix tcon channel 1 backporch calculation

It seems like what's called a backporch in the datasheet is actually the backporch plus the sync period. Fix that in our driver. Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
mariux64 · Jun 1, 2017 · 3cb2f46 · 3cb2f46
1 parent b7cb9b9
commit 3cb2f46
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -269,15 +269,15 @@ void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
 		     SUN4I_TCON1_BASIC2_Y(mode->crtc_vdisplay));
 
 	/* Set horizontal display timings */
-	bp = mode->crtc_htotal - mode->crtc_hsync_end;
+	bp = mode->crtc_htotal - mode->crtc_hsync_start;
 	DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
 			 mode->htotal, bp);
 	regmap_write(tcon->regs, SUN4I_TCON1_BASIC3_REG,
 		     SUN4I_TCON1_BASIC3_H_TOTAL(mode->crtc_htotal) |
 		     SUN4I_TCON1_BASIC3_H_BACKPORCH(bp));
 
 	/* Set vertical display timings */
-	bp = mode->crtc_vtotal - mode->crtc_vsync_end;
+	bp = mode->crtc_vtotal - mode->crtc_vsync_start;
 	DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
 			 mode->vtotal, bp);
 	regmap_write(tcon->regs, SUN4I_TCON1_BASIC4_REG,