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

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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>
This commit is contained in:
Chen-Yu Tsai 2017-03-09 18:05:25 +08:00 committed by Maxime Ripard
parent 4c7f16d14a
commit 23a1cb11d9
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/sun4i/sun4i_tcon.c
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@ -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",