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| author | Chen-Yu Tsai <wens@csie.org> | 2017-03-09 18:05:25 +0800 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2017-03-09 11:19:05 +0100 |
| commit | 23a1cb11d90d8e66bfe3a506cfaa88486bbcfc61 (patch) | |
| tree | bc6377fbea9d199ba7d62d8043b53186495f53a5 /drivers/gpu/drm/sun4i | |
| parent | 4c7f16d14a33a9cfb4af9cb780d8a73bcca64a92 (diff) | |
| download | linux-23a1cb11d90d8e66bfe3a506cfaa88486bbcfc61.tar.bz2 | |
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>
Diffstat (limited to 'drivers/gpu/drm/sun4i')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_tcon.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index ee51d7e77a6a..c52c482c8fd0 100644 --- 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", |