drm/sun4i: Fix tcon channel 0 comment about backporch = backporch + hsync

The backporch programmed into the tcon registers is actually the
backporch + hsync length from the display timings, as indicated in
the interface timing diagrams found in the user manual of the A31
and A33 SoCs.

The comments for channel 0 mistakenly describe the discrepancy as
TCON backporch = frontporch + hsync.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index ee51d7e..c52c482 100644 (file)
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -143,7 +143,7 @@ void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon,
 
        /*
         * This is called a backporch in the register documentation,
-        * but it really is the front porch + hsync
+        * but it really is the back porch + hsync
         */
        bp = mode->crtc_htotal - mode->crtc_hsync_start;
        DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
@@ -156,7 +156,7 @@ void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon,
 
        /*
         * This is called a backporch in the register documentation,
-        * but it really is the front porch + hsync
+        * but it really is the back porch + hsync
         */
        bp = mode->crtc_vtotal - mode->crtc_vsync_start;
        DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",