diff options
| author |   Maxime Ripard <maxime.ripard@bootlin.com> | 2019-02-11 15:41:24 +0100 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@bootlin.com> | 2019-02-19 11:08:25 +0100 |
| commit | efa31801203ac2f5c6a82a28cb991c7163ee0f1d (patch) | |
| tree | 67f9e33e3ef2c9bd48c8b18edcd7767d81450e00 /drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | |
| parent | drm/sun4i: dsi: Change the start delay calculation (diff) | |
| download | linux-dev-efa31801203ac2f5c6a82a28cb991c7163ee0f1d.tar.xz linux-dev-efa31801203ac2f5c6a82a28cb991c7163ee0f1d.zip | |
drm/sun4i: dsi: Enforce boundaries on the start delay
The Allwinner BSP makes sure that we don't end up with a null start delay
or with a delay larger than vtotal.
The former condition is likely to happen now with the reworked start delay,
so make sure we enforce the same boundaries.
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/c9889cf5f7a3d101ef380905900b45a182596f56.1549896081.git-series.maxime.ripard@bootlin.com
Diffstat (limited to 'drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index 25d8cb9f9266..869e0aedf343 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -359,8 +359,12 @@ static u16 sun6i_dsi_get_video_start_delay(struct sun6i_dsi *dsi, struct drm_display_mode *mode) { u16 start = clamp(mode->vtotal - mode->vdisplay - 10, 8, 100); + u16 delay = mode->vtotal - (mode->vsync_end - mode->vdisplay) + start; - return mode->vtotal - (mode->vsync_end - mode->vdisplay) + start; + if (delay > mode->vtotal) + delay = delay % mode->vtotal; + + return max_t(u16, delay, 1); } static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi, |