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drm/tegra: dsi: Use proper back-porch for non-sync video mode

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In video modes without sync pulses, the horizontal back-porch needs to
include the horizontal sync width.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2015-04-08 16:58:07 +02:00
commit b8be0bdbd5
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/tegra/dsi.c
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@ -548,14 +548,19 @@ static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe,
/* horizontal sync width */
hsw = (mode->hsync_end - mode->hsync_start) * mul / div;
hsw -= 10;
/* horizontal back porch */
hbp = (mode->htotal - mode->hsync_end) * mul / div;
hbp -= 14;
if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0)
hbp += hsw;
/* horizontal front porch */
hfp = (mode->hsync_start - mode->hdisplay) * mul / div;
/* subtract packet overhead */
hsw -= 10;
hbp -= 14;
hfp -= 8;
tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1);